一、准备环境

1.引入坐标

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>BrandTest</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.2</version>
      </plugin>
    </plugins>

  </build>
  <dependencies>
    <!--mysql driver-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.16</version>
    </dependency>
    <!--mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.6</version>
    </dependency>
    <!--junit-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
    <groupId>jstl</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
  </dependency>
  <dependency>
    <groupId>taglibs</groupId>
    <artifactId>standard</artifactId>
    <version>1.1.2</version>
  </dependency>
  </dependencies>

</project>

2.创建三层架构的包结构

com.jkj.web
com.jkj.service
com.jkj.mapper
com.jkj.pojo
com.jkj.util

注意：在resources创建com/jkj/mapper,用来放xxxMapper.xml文件。

在这里插入图片描述

3.数据库表 tb_brand和tb_login（数据库名：mybatis）

在这里插入图片描述

自己往表里添加数据。

4.实体类 Brand

package com.jkj.pojo;

public class Brand {
    private Integer id;
    private String brandName;
    private String companyName;
    private Integer ordered;
    private String description;
    private Integer status;

    public Brand() {
    }

    public Brand(Integer id, String brandName, String companyName, Integer ordered, String description, Integer status) {
        this.id = id;
        this.brandName = brandName;
        this.companyName = companyName;
        this.ordered = ordered;
        this.description = description;
        this.status = status;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getBrandName() {
        return brandName;
    }

    public void setBrandName(String brandName) {
        this.brandName = brandName;
    }

    public String getCompanyName() {
        return companyName;
    }

    public void setCompanyName(String companyName) {
        this.companyName = companyName;
    }

    public Integer getOrdered() {
        return ordered;
    }

    public void setOrdered(Integer ordered) {
        this.ordered = ordered;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    @Override
    public String toString() {
        return "Brand{" +
                "id=" + id +
                ", brandName='" + brandName + '\'' +
                ", companyName='" + companyName + '\'' +
                ", ordered=" + ordered +
                ", description='" + description + '\'' +
                ", status=" + status +
                '}';
    }
}

5.实体类 User

package com.jkj.pojo;

public class User {
     private Integer id;
     private String username;
     private String password;

    public User() {
    }

    public User(Integer id, String username, String password) {
        this.id = id;
        this.username = username;
        this.password = password;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

6.mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <package name="com.jkj.pojo"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <package name="com.jkj.mapper"/>
    </mappers>
</configuration>

7.BrandMapper.xml

package com.jkj.mapper;

import com.jkj.pojo.Brand;
import org.apache.ibatis.annotations.*;

import java.util.List;

public interface BrandMapper {
 
}

8.BrandMapper接口

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.jkj.mapper.BrandMapper">
    
</mapper>

9.UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.jkj.mapper.UserMapper">

</mapper>

10.UserMapper接口

package com.jkj.mapper;

import com.jkj.pojo.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

public interface UserMapper {

}

11.SessionFactory工具类

可参照：SessionFactory工具类进行学习。

package com.jkj.util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class SqlSessionFactoryUtils {
    private static SqlSessionFactory sqlSessionFactory;
    static{
        String resource = "mybatis-config.xml";
        InputStream inputStream = null;
        try {
            inputStream = Resources.getResourceAsStream(resource);
        } catch (IOException e) {
            e.printStackTrace();
        }
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    }

    public static SqlSessionFactory getSqlSessionFactory(){
        return sqlSessionFactory;
    }

}

二、登录

在这里插入图片描述

1.用户登录及记住用户

1.编写UserMapper

public interface UserMapper {
    //根据用户名和密码查询用户对象
    @Select("select * from tb_login where username=#{username} and password=#{password}")
    User select(@Param("username") String userName,@Param("password") String password);
    //根据用户名查找对象
    @Select("select * from tb_login where username=#{username}")
    User selectByUserName(String username);
    }

2.编写UserService.java

public class UserService {
    //登录方法
    public User login(String username,String password){
        SqlSessionFactory sqlSessionFactory= SqlSessionFactoryUtils.getSqlSessionFactory();
        SqlSession sqlSession = sqlSessionFactory.openSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User user = mapper.select(username, password);
        sqlSession.close();
        return user;
        }

    }

3.编写login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@page isELIgnored="false" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>login</title>
    <link href="css/login.css" rel="stylesheet">
</head>
<body>
<div id="loginDiv" style="height: 350px">
    <form action="/BrandTest/loginServlet" method="post" id="form">
        <h1 id="loginMsg">用户登录</h1>
        <div id="errorMsg">${login_msg}${register_msg}</div>
        <p>用&nbsp;户&nbsp;名:<input id="username" name="username" value="${cookie.username.value}" type="text"></p>
        <p>密&nbsp;&nbsp;&nbsp;&nbsp;码:<input id="password" name="password" value="${cookie.password.value}" type="password"></p>
        <p>记住密码:<input id="remember" name="remember" value="1" type="checkbox"></p>
        <div id="subDiv">
            <input type="submit" class="button" value="登录">
            <input type="reset" class="button" value="取消">&nbsp;&nbsp;&nbsp;
            <a href="register.jsp">注册</a>
        </div>
    </form>
</div>
</body>
</html>

4.login.css

* {
    margin: 0;
    padding: 0;
}

html {
    height: 100%;
    width: 100%;
    overflow: hidden;
    margin: 0;
    padding: 0;
    background-color: rgba(48, 190, 216, 0.5);
    background-size: 100% 100%;
    -moz-background-size: 100% 100%;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

#loginDiv {
    width: 37%;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 380px;
    background-color: rgba(48, 190, 216, 0.3);
    box-shadow: 7px 7px 17px rgba(52, 56, 66, 0.5);
    border-radius: 5px;
}

#name_trip {
    margin-left: 50px;
    color: red;
}

p {
    margin-top: 30px;
    margin-left: 20px;
    color: azure;
}


#remember{
    margin-left: 15px;
    border-radius: 5px;
    border-style: hidden;
    background-color: rgba(216, 191, 216, 0.5);
    outline: none;
    padding-left: 10px;
    height: 20px;
    width: 20px;
}
#username{
    width: 200px;
    margin-left: 15px;
    border-radius: 5px;
    border-style: hidden;
    height: 30px;
    background-color: rgba(216, 191, 216, 0.5);
    outline: none;
    color: #f0edf3;
    padding-left: 10px;
}
#password{
    width: 202px;
    margin-left: 15px;
    border-radius: 5px;
    border-style: hidden;
    height: 30px;
    background-color: rgba(216, 191, 216, 0.5);
    outline: none;
    color: #f0edf3;
    padding-left: 10px;
}
.button {
    border-color: cornsilk;
    background-color: rgba(100, 149, 237, .7);
    color: aliceblue;
    border-style: hidden;
    border-radius: 5px;
    width: 100px;
    height: 31px;
    font-size: 16px;
}

#subDiv {
    text-align: center;
    margin-top: 30px;
}
#loginMsg{
    text-align: center;
    color: aliceblue;
}
#errorMsg{
    text-align: center;
    color:red;
}

5.编写loginServlet.java

package com.jkj.web;

import com.jkj.pojo.User;
import com.jkj.service.UserService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;
@WebServlet("/loginServlet")
public class loginServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //接收参数
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String remember = req.getParameter("remember");
        //调用service
        UserService service = new UserService();
        //调用方法
        User user = service.login(username, password);
        //判断
        if (user !=null){
            //判断用户是否勾选了
            if ("1".equals("remember")){
                //创建cookie
                Cookie u = new Cookie("username",username);
                Cookie p = new Cookie("password", password);
                //存活时间
                u.setMaxAge(60);
                p.setMaxAge(60);
                //发送
                resp.addCookie(u);
                resp.addCookie(p);
            }
            //将user存储到session中
            HttpSession session = req.getSession();
            session.setAttribute("user",user);
            String contextPath = req.getContextPath();
           resp.sendRedirect(contextPath+"/selectAllServlet");
        }else {
            req.setAttribute("login_msg","用户名或密码错误！");
            req.getRequestDispatcher("/login.jsp").forward(req,resp);

        }

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

6.编写brand.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body bgcolor="#00ced1">
<h1 align="center">欢迎！${user.username},登录成功！</h1>
<div align="center">
    <input type="button" value="新增" id="add"><br>
</div>
<table border="1" bgcolor="#00ced1" cellpadding="0" width="800" align="center">
    <tr>
        <td>序号</td>
        <td>品牌名称</td>
        <td>企业名称</td>
        <td>排序</td>
        <td>品牌介绍</td>
        <td>状态</td>
        <td>操作</td>
    </tr>
    <c:forEach items="${brands}" var="brand" varStatus="status">
        <tr align="center">
            <td>${status.count}</td>
            <td>${brand.brandName}</td>
            <td>${brand.companyName}</td>
            <td>${brand.ordered}</td>
            <td>${brand.description}</td>
            <c:if test="${brand.status ==1}">
                <td>启用</td>
            </c:if>
            <c:if test="${brand.status !=1}">
                <td>禁用</td>
            </c:if>
            <td><a href="/BrandTest/selectByIdServlet?id=${brand.id}">修改</a>&nbsp;&nbsp;<a href="/BrandTest/deleteByIdServlet?idd=${brand.id}">删除</a> </td>
        </tr>
    </c:forEach>
</table>
<script>
    document.getElementById("add").onclick=function () {
        location.href="/BrandTest/addBrand.jsp";

    }
</script>
</body>
</html>

7.测试

登录数据库已有的用户名和密码：
在这里插入图片描述
用户名或密码错误的运行结果及提示错误信息：

登录成功，跳转到主页面，brand.jsp页面:

三、注册

1.用户注册和验证码

1.编写UserMapper

package com.jkj.mapper;

import com.jkj.pojo.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

public interface UserMapper {
    //根据用户名和密码查询用户对象
    @Select("select * from tb_login where username=#{username} and password=#{password}")
    User select(@Param("username") String userName,@Param("password") String password);

    //根据用户名查找对象
    @Select("select * from tb_login where username=#{username}")
    User selectByUserName(String username);

    //添加用户
    @Insert("insert into tb_login values (null,#{username},#{password})")
    void addUser(User user);

}

2.编写UserService.java

package com.jkj.service;

import com.jkj.mapper.UserMapper;
import com.jkj.pojo.User;
import com.jkj.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

public class UserService {
    //登录方法
    public User login(String username,String password){
        SqlSessionFactory sqlSessionFactory= SqlSessionFactoryUtils.getSqlSessionFactory();
        SqlSession sqlSession = sqlSessionFactory.openSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User user = mapper.select(username, password);
        sqlSession.close();
        return user;

    }
    //注册方法
    public boolean register(User user) {
        SqlSessionFactory sqlSessionFactory= SqlSessionFactoryUtils.getSqlSessionFactory();
        // 获取SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        // 获取UserMapper
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        // 调用方法
        User u = mapper.selectByUserName(user.getUsername());
        // 对用户是否存在判定
        if (u == null) {
            // 用户不存在进行注册操作
            mapper.addUser(user);
            sqlSession.commit();
        }
        // 关闭资源
        sqlSession.close();
        return u == null;
    }
}

3.编写register.jsp

<%@ page import="java.util.Date" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@page isELIgnored="false" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>欢迎注册</title>
    <link href="css/register.css" rel="stylesheet">
</head>
<body>
<div class="form-div">
    <div class="reg-content">
        <h1>欢迎注册</h1>
        <span>已有账号！</span> <a href="login.jsp">登录</a>
    </div>
    <form id="reg-form" action="/BrandTest/registerServlet" method="get">
        <table>
            <tr>
                <td>用&nbsp;户&nbsp;名</td>
                <td class="inputs">
                    <input name="username" type="text" id="username">
                    <br>
                    <span id="username_err" class="err_msg">${register_msg}</span>
                </td>
            </tr>
            <tr>
                <td>密&nbsp;&nbsp;&nbsp;&nbsp;码</td>
                <td class="inputs">
                    <input name="password" type="password" id="password">
                    <br>
                    <span id="password_err" class="err_msg"></span>
                </td>
            </tr>
            <tr>
                <td>验&nbsp;证&nbsp;码</td>
                <td class="inputs">
                    <%--<input name="checkCode" type="text" id="checkCode">
                     <img src="/BrandTest/code">
                    <a href="#" id="changeImg" >看不清？</a>--%>
                        <input type="text" name="verifycode" class="form-control col-sm-6" id="verifycode" placeholder="Please Check" style="width: 120px;"/>
                        <a href="javascript:refreshCode()" onclick="refreshCode()" class="col-sm-4">
                            <img src="/BrandTest/checkCodeServlet" title="刷新" id="vcode"/>
                        </a>

                </td>
            </tr>
        </table>
        <div class="buttons">
            <input value="注册" type="submit" id="reg_btn">
        </div>
        <br class="clear">
    </form>
</div>
<script>
    //切换验证码
    function refreshCode() {
        //1、获取验证码图片对象
        var vcode = document.getElementById("vcode");
        //2、设置其src属性，加时间戳
        vcode.src="/BrandTest/checkCodeServlet?time="+new Date().getTime();
    }
</script>

</body>
</html>

4.编写register.css

* {
    margin: 0;
    padding: 0;
    list-style-type: none;
}
.reg-content{
    padding: 30px;
    margin: 3px;
}
a, img {
    border: 0;
}

body {
    background-color: rgba(48, 190, 216, 0.5);
    text-align: center;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}

td, th {
    padding: 0;
    height: 90px;

}
.inputs{
    vertical-align: top;
}

.clear {
    clear: both;
}

.clear:before, .clear:after {
    content: "";
    display: table;
}

.clear:after {
    clear: both;
}

.form-div {
    background-color: rgba(255, 255, 255, 0.27);
    border-radius: 10px;
    border: 1px solid #aaa;
    width: 424px;
    margin-top: 150px;
    margin-left:1050px;
    padding: 30px 0 20px 0px;
    font-size: 16px;
    box-shadow: inset 0px 0px 10px rgba(255, 255, 255, 0.5), 0px 0px 15px rgba(75, 75, 75, 0.3);
    text-align: center;
}

.form-div input[type="text"], .form-div input[type="password"], .form-div input[type="email"] {
    width: 268px;
    margin: 10px;
    line-height: 20px;
    font-size: 16px;
}

.form-div input[type="checkbox"] {
    margin: 20px 0 20px 10px;
}

.form-div input[type="button"], .form-div input[type="submit"] {
    margin: 10px 20px 0 0;
}

.form-div table {
    margin: 0 auto;
    text-align: right;
    color: rgba(64, 64, 64, 1.00);
}

.form-div table img {
    vertical-align: middle;
    margin: 0 0 5px 0;
}

.footer {
    color: rgba(64, 64, 64, 1.00);
    font-size: 12px;
    margin-top: 30px;
}

.form-div .buttons {
    float: right;
}

input[type="text"], input[type="password"], input[type="email"] {
    border-radius: 8px;
    box-shadow: inset 0 2px 5px #eee;
    padding: 10px;
    border: 1px solid #D4D4D4;
    color: #333333;
    margin-top: 5px;
}

input[type="text"]:focus, input[type="password"]:focus, input[type="email"]:focus {
    border: 1px solid #50afeb;
    outline: none;
}

input[type="button"], input[type="submit"] {
    padding: 7px 15px;
    background-color: #3c6db0;
    text-align: center;
    border-radius: 5px;
    overflow: hidden;
    min-width: 80px;
    border: none;
    color: #FFF;
    box-shadow: 1px 1px 1px rgba(75, 75, 75, 0.3);
}

input[type="button"]:hover, input[type="submit"]:hover {
    background-color: #5a88c8;
}

input[type="button"]:active, input[type="submit"]:active {
    background-color: #5a88c8;
}
.err_msg{
    color: red;
    padding-right: 170px;
}
#password_err,#tel_err{
    padding-right: 195px;
}

#reg_btn{
    margin-right:50px; width: 285px; height: 45px; margin-top:20px;
}

#checkCode{
    width: 100px;
}

#changeImg{
    color: aqua;
}

5.编写registerServlet.java

package com.jkj.web;
import com.jkj.pojo.User;
import com.jkj.service.UserService;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

@WebServlet("/registerServlet")
public class registerServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 1. 获取用户名和密码数据
        String username = req.getParameter("username");
        String password = req.getParameter("password");

        // 避免用户名存在中文导致乱码
        username = new String(username.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);

        // 2. 封装成User对象
        User user = new User();
        user.setUsername(username);
        user.setPassword(password);

        // 3. 调用service中的注册方法
        UserService service = new UserService();
        boolean register = service.register(user);

        String verifycode1 = req.getParameter("verifycode");//用户输入的验证码
        String checkcode_server = (String) req.getSession().getAttribute("CHECKCODE_SERVER");//生成的验证码
        if(verifycode1.equals("")||!checkcode_server.equalsIgnoreCase(verifycode1))//不输入verifycode为空字符串，不是null
        {
            req.setAttribute("register_msg", "验证码错误");
            req.getRequestDispatcher("register.jsp").forward(req, resp);
            return;
        }


        // 4. 判断是否注册成功
        if (register) {
            // 注册成功
            req.setAttribute("register_msg", "新用户注册成功");
            req.getRequestDispatcher("login.jsp").forward(req, resp);
        } else {
            // 注册失败
            req.setAttribute("register_msg", "该用户名已存在");
            req.getRequestDispatcher("register.jsp").forward(req, resp);
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

6.运行测试

1.先注册一个数据库有的数据
在这里插入图片描述
2.注册个新用户，验证码要填写正确(首页就变成欢迎，cat了)

四、完成品牌数据的增删改查

2.查询所有

在这里插入图片描述

1.编写接口方法

操作数据比较简单建议使用注解的形式。

public interface BrandMapper {
    //查询所有
    @Select("select * from tb_brand")
    @ResultMap("brandResultMap")
    List<Brand> selectAll();
}

2.编写BrandMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.jkj.mapper.BrandMapper">
    <resultMap id="brandResultMap" type="brand">
        <result column="brand_name" property="brandName"></result>
        <result column="company_name" property="companyName"></result>
    </resultMap>
</mapper>

3.编写service

新建BrandService.java

public class BrandService {
    SqlSessionFactory sqlSessionFactory=SqlSessionFactoryUtils.getSqlSessionFactory();
    //查询全部
    public List<Brand> selectAll(){
        //调用BrandMapper.selectAll()
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        List<Brand> brands = mapper.selectAll();
        //释放资源
        sqlSession.close();
        return brands;
    }
    }

4.编写Servlet

创建selectAllServlet.java

package com.jkj.web;

import com.jkj.pojo.Brand;
import com.jkj.service.BrandService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
@WebServlet("/selectAllServlet")
public class selectAllServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       //调用BrandService,完成查询
        BrandService service = new BrandService();
        List<Brand> brands = service.selectAll();
        //存入request域中
        req.setAttribute("brands",brands);
        //转发到brand.jsp
        req.getRequestDispatcher("/brand.jsp").forward(req,resp);

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

5.编写brand.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body bgcolor="#00ced1">
<h1 align="center">欢迎！${user.username},登录成功！</h1>
<div align="center">
    <input type="button" value="新增" id="add"><br>
</div>
<table border="1" bgcolor="#00ced1" cellpadding="0" width="800" align="center">
    <tr>
        <td>序号</td>
        <td>品牌名称</td>
        <td>企业名称</td>
        <td>排序</td>
        <td>品牌介绍</td>
        <td>状态</td>
        <td>操作</td>
    </tr>
    <c:forEach items="${brands}" var="brand" varStatus="status">
        <tr align="center">
            <td>${status.count}</td>
            <td>${brand.brandName}</td>
            <td>${brand.companyName}</td>
            <td>${brand.ordered}</td>
            <td>${brand.description}</td>
            <c:if test="${brand.status ==1}">
                <td>启用</td>
            </c:if>
            <c:if test="${brand.status !=1}">
                <td>禁用</td>
            </c:if>
            <td><a href="#">修改</a>&nbsp;&nbsp;<a href="#">删除</a> </td>
        </tr>
    </c:forEach>
</table>
</script>
</body>
</html>

7.测试

在这里插入图片描述

3.添加

在这里插入图片描述

1.编写BrandMapper接口

public interface BrandMapper {
    //查询所有
    @Select("select * from tb_brand")
    @ResultMap("brandResultMap")
    List<Brand> selectAll();
    //添加数据
    @Insert("insert into tb_brand values(null,#{brandName},#{companyName},#{ordered},#{description},#{status})")
    void add(Brand brand);
    }

2.编写BrandService.java

public class BrandService {
    SqlSessionFactory sqlSessionFactory=SqlSessionFactoryUtils.getSqlSessionFactory();
    //查询全部
    public List<Brand> selectAll(){
        //调用BrandMapper.selectAll()
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        List<Brand> brands = mapper.selectAll();
        //释放资源
        sqlSession.close();
        return brands;
    }
    //添加数据
    public void add(Brand brand){
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        mapper.add(brand);
        sqlSession.commit();
        sqlSession.close();
    }
    }

3.编写brand.jsp

点击“新增”，转到addBrand.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body bgcolor="#00ced1">
<h1 align="center">欢迎！${user.username},登录成功！</h1>
<div align="center">
    <input type="button" value="新增" id="add"><br>
</div>
<table border="1" bgcolor="#00ced1" cellpadding="0" width="800" align="center">
    <tr>
        <td>序号</td>
        <td>品牌名称</td>
        <td>企业名称</td>
        <td>排序</td>
        <td>品牌介绍</td>
        <td>状态</td>
        <td>操作</td>
    </tr>
    <c:forEach items="${brands}" var="brand" varStatus="status">
        <tr align="center">
            <td>${status.count}</td>
            <td>${brand.brandName}</td>
            <td>${brand.companyName}</td>
            <td>${brand.ordered}</td>
            <td>${brand.description}</td>
            <c:if test="${brand.status ==1}">
                <td>启用</td>
            </c:if>
            <c:if test="${brand.status !=1}">
                <td>禁用</td>
            </c:if>
            <td><a href="#">修改</a>&nbsp;&nbsp;<a href="#">删除</a> </td>
        </tr>
    </c:forEach>
</table>
<script>
    document.getElementById("add").onclick=function () {
        location.href="/BrandTest/addBrand.jsp";

    }
</script>
</body>
</html>

4.编写addBrand.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body bgcolor="#00ced1">
<div align="center">
<h3>添加品牌</h3>
<form action="/BrandTest/addServlet" method="post">
    品牌名称：<input name="brandName"><br>
    企业名称：<input name="companyName"><br>
    排&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;序：<input name="ordered"><br>
    描述信息：<textarea rows="5" cols="20" name="description"></textarea><br>
    状&nbsp;&nbsp;&nbsp;&nbsp;态：
          <input type="radio" name="status" value="0">禁用
          <input type="radio" name="status" value="1">启用<br>

    <input type="submit" value="提交">
</form>
</div>
</body>
</html>

5.编写AddServlet

package com.jkj.web;

import com.jkj.pojo.Brand;
import com.jkj.service.BrandService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/addServlet")
public class addServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        BrandService service = new BrandService();
        //post乱码
        req.setCharacterEncoding("utf-8");
        //接收参数
        String brandName = req.getParameter("brandName");
        String companyName = req.getParameter("companyName");
        String ordered = req.getParameter("ordered");
        String description = req.getParameter("description");
        String status = req.getParameter("status");
        //封装对象
        Brand brand=new Brand();
        brand.setBrandName(brandName);
        brand.setCompanyName(companyName);
        brand.setOrdered(Integer.parseInt(ordered));
        brand.setDescription(description);
        brand.setStatus(Integer.parseInt(status));

        //调用service
        service.add(brand);
        //转发到查询所有数据
        req.getRequestDispatcher("/selectAllServlet").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

6.测试运行

在brand.jsp页面中，点击“新增”跳转到addBrand.jsp页面，然后填写信息，点击提交
在这里插入图片描述

点击提交后又跳转到brand.jsp页面
在这里插入图片描述

4.修改-回显数据

在修改页面，显示当前的数据，你可以选择修改部分数据，或者全部修改。
在这里插入图片描述

1.编写BrandMapper.java

public interface BrandMapper {
    //查询所有
    @Select("select * from tb_brand")
    @ResultMap("brandResultMap")
    List<Brand> selectAll();
    //添加数据
    @Insert("insert into tb_brand values(null,#{brandName},#{companyName},#{ordered},#{description},#{status})")
    void add(Brand brand);
    //根据id查询数据
    @Select("select * from tb_brand where id=#{id}")
    @ResultMap("brandResultMap")
    Brand selectById(int id);
    }

2.编写BrandService.java

public class BrandService {
    SqlSessionFactory sqlSessionFactory=SqlSessionFactoryUtils.getSqlSessionFactory();
    //查询全部
    public List<Brand> selectAll(){
        //调用BrandMapper.selectAll()
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        List<Brand> brands = mapper.selectAll();
        //释放资源
        sqlSession.close();
        return brands;
    }
    //添加数据
    public void add(Brand brand){
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        mapper.add(brand);
        sqlSession.commit();
        sqlSession.close();
    }
    //通过id查找数据
    public Brand selectById(int id){
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        Brand brand = mapper.selectById(id);
        return brand;
    }
    }

3.编写brand.jsp

连接selectByIdServlet.java获取id

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body bgcolor="#00ced1">
<h1 align="center">欢迎！${user.username},登录成功！</h1>
<div align="center">
    <input type="button" value="新增" id="add"><br>
</div>
<table border="1" bgcolor="#00ced1" cellpadding="0" width="800" align="center">
    <tr>
        <td>序号</td>
        <td>品牌名称</td>
        <td>企业名称</td>
        <td>排序</td>
        <td>品牌介绍</td>
        <td>状态</td>
        <td>操作</td>
    </tr>
    <c:forEach items="${brands}" var="brand" varStatus="status">
        <tr align="center">
            <td>${status.count}</td>
            <td>${brand.brandName}</td>
            <td>${brand.companyName}</td>
            <td>${brand.ordered}</td>
            <td>${brand.description}</td>
            <c:if test="${brand.status ==1}">
                <td>启用</td>
            </c:if>
            <c:if test="${brand.status !=1}">
                <td>禁用</td>
            </c:if>
            <td><a href="/BrandTest/selectByIdServlet?id=${brand.id}">修改</a>&nbsp;&nbsp;<a href="#">删除</a> </td>
        </tr>
    </c:forEach>
</table>
<script>
    document.getElementById("add").onclick=function () {
        location.href="/BrandTest/addBrand.jsp";

    }
</script>
</body>
</html>

4.编写SelectByIdServlet.java

package com.jkj.web;

import com.jkj.pojo.Brand;
import com.jkj.service.BrandService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/deleteByIdServlet")
public class deleteByIdServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //接收参数
        String id = req.getParameter("idd");
        //调用BrandService,完成查询
        BrandService service = new BrandService();
        service.deleteById(Integer.parseInt(id));
        //转发到update.jsp
        req.getRequestDispatcher("/selectAllServlet").forward(req,resp);

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

5.编写update.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body bgcolor="#00ced1">
<div align="center">
<h3>修改品牌</h3>
<form action="/BrandTest/updateServlet" method="post">
    <!--
    隐藏域：获取id
    -->
    <input type="hidden" name="id" value="${brand.id}">
    品牌名称：<input name="brandName" value="${brand.brandName}"><br>
    企业名称：<input name="companyName" value="${brand.companyName}"><br>
    排&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;序：<input name="ordered" value="${brand.ordered}"><br>
    描述信息：<textarea rows="5" cols="20" name="description">${brand.description}</textarea><br>
    状&nbsp;&nbsp;&nbsp;&nbsp;态：
    <c:if test="${brand.status==0}">
        <input type="radio" name="status" value="0" checked>禁用
        <input type="radio" name="status" value="1" >启用<br>
    </c:if>
    <c:if test="${brand.status==1}">
        <input type="radio" name="status" value="0">禁用
        <input type="radio" name="status" value="1" checked>启用<br>
    </c:if>
    <input type="submit" value="提交">
</form>
</div>
</body>
</html>

6.运行测试

在这里插入图片描述

5.修改数据

在这里插入图片描述

1.编写BrandMapper.java

public interface BrandMapper {
    //查询所有
    @Select("select * from tb_brand")
    @ResultMap("brandResultMap")
    List<Brand> selectAll();
    //添加数据
    @Insert("insert into tb_brand values(null,#{brandName},#{companyName},#{ordered},#{description},#{status})")
    void add(Brand brand);
    //根据id查询数据
    @Select("select * from tb_brand where id=#{id}")
    @ResultMap("brandResultMap")
    Brand selectById(int id);
    //修改数据
    @Update("update tb_brand set brand_name=#{brandName},company_name=#{companyName},ordered=#{ordered},description=#{description},status=#{status} where id=#{id} ")
    @ResultMap("brandResultMap")
    void update(Brand brand);
    }

2.编写BrandService

public class BrandService {
    SqlSessionFactory sqlSessionFactory=SqlSessionFactoryUtils.getSqlSessionFactory();
    //查询全部
    public List<Brand> selectAll(){
        //调用BrandMapper.selectAll()
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        List<Brand> brands = mapper.selectAll();
        //释放资源
        sqlSession.close();
        return brands;
    }
    //添加数据
    public void add(Brand brand){
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        mapper.add(brand);
        sqlSession.commit();
        sqlSession.close();
    }
    //通过id查找数据
    public Brand selectById(int id){
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        Brand brand = mapper.selectById(id);
        return brand;
    }
    //修改数据
    public void update(Brand brand){
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        mapper.update(brand);
        sqlSession.commit();
        sqlSession.close();
    }
    }

3.修改update.jsp

修改update.jsp数据传输到servlet，注意要传入id到servlet，注意id不要显示在update.jsp页面中(隐藏域),type = hidden

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body bgcolor="#00ced1">
<div align="center">
<h3>修改品牌</h3>
<form action="/BrandTest/updateServlet" method="post">
    <!--
    隐藏域：获取id
    -->
    <input type="hidden" name="id" value="${brand.id}">
    品牌名称：<input name="brandName" value="${brand.brandName}"><br>
    企业名称：<input name="companyName" value="${brand.companyName}"><br>
    排&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;序：<input name="ordered" value="${brand.ordered}"><br>
    描述信息：<textarea rows="5" cols="20" name="description">${brand.description}</textarea><br>
    状&nbsp;&nbsp;&nbsp;&nbsp;态：
    <c:if test="${brand.status==0}">
        <input type="radio" name="status" value="0" checked>禁用
        <input type="radio" name="status" value="1" >启用<br>
    </c:if>
    <c:if test="${brand.status==1}">
        <input type="radio" name="status" value="0">禁用
        <input type="radio" name="status" value="1" checked>启用<br>
    </c:if>
    <input type="submit" value="提交">
</form>
</div>
</body>
</html>

4.编写updateServlet.java

package com.jkj.web;

import com.jkj.pojo.Brand;
import com.jkj.service.BrandService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/updateServlet")
public class updateServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        BrandService service = new BrandService();
        //post乱码
        req.setCharacterEncoding("utf-8");
        //接收参数
        String id = req.getParameter("id");
        String brandName = req.getParameter("brandName");
        String companyName = req.getParameter("companyName");
        String ordered = req.getParameter("ordered");
        String description = req.getParameter("description");
        String status = req.getParameter("status");
        //封装对象
        Brand brand=new Brand();
        brand.setId(Integer.parseInt(id));
        brand.setBrandName(brandName);
        brand.setCompanyName(companyName);
        brand.setOrdered(Integer.parseInt(ordered));
        brand.setDescription(description);
        brand.setStatus(Integer.parseInt(status));

        //调用service
       service.update(brand);
        //转发到查询所有数据
        req.getRequestDispatcher("/selectAllServlet").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

5.测试运行

在update.jsp页面点击提交，跳转到brand.jsp页面，显示修改的内容。
在这里插入图片描述

6.删除

1.编写BrandMapper.java

package com.jkj.mapper;

import com.jkj.pojo.Brand;
import org.apache.ibatis.annotations.*;

import java.util.List;

public interface BrandMapper {
    //查询所有
    @Select("select * from tb_brand")
    @ResultMap("brandResultMap")
    List<Brand> selectAll();
    //添加数据
    @Insert("insert into tb_brand values(null,#{brandName},#{companyName},#{ordered},#{description},#{status})")
    void add(Brand brand);
    //根据id查询数据
    @Select("select * from tb_brand where id=#{id}")
    @ResultMap("brandResultMap")
    Brand selectById(int id);
    //修改数据
    @Update("update tb_brand set brand_name=#{brandName},company_name=#{companyName},ordered=#{ordered},description=#{description},status=#{status} where id=#{id} ")
    @ResultMap("brandResultMap")
    void update(Brand brand);
    //删除数据
    @Delete("delete from tb_brand where id=#{id}")
    void deleteById(int id);
}

2.编写BrandService.java

package com.jkj.service;

import com.jkj.mapper.BrandMapper;
import com.jkj.pojo.Brand;
import com.jkj.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import java.util.List;

public class BrandService {
    SqlSessionFactory sqlSessionFactory=SqlSessionFactoryUtils.getSqlSessionFactory();
    //查询全部
    public List<Brand> selectAll(){
        //调用BrandMapper.selectAll()
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        List<Brand> brands = mapper.selectAll();
        //释放资源
        sqlSession.close();
        return brands;
    }
    //添加数据
    public void add(Brand brand){
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        mapper.add(brand);
        sqlSession.commit();
        sqlSession.close();
    }
    //通过id查找数据
    public Brand selectById(int id){
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        Brand brand = mapper.selectById(id);
        return brand;
    }
    //修改数据
    public void update(Brand brand){
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        mapper.update(brand);
        sqlSession.commit();
        sqlSession.close();
    }
    //删除数据
    public void deleteById(int id){
        //获取 SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //调用方法
        mapper.deleteById(id);
        sqlSession.commit();
        sqlSession.close();
    }
}

3.编写deleteByIdServlet

package com.jkj.web;

import com.jkj.pojo.Brand;
import com.jkj.service.BrandService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/deleteByIdServlet")
public class deleteByIdServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //接收参数
        String id = req.getParameter("idd");
        //调用BrandService,完成查询
        BrandService service = new BrandService();
        service.deleteById(Integer.parseInt(id));
        //转发到update.jsp
        req.getRequestDispatcher("/selectAllServlet").forward(req,resp);

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

4编写brand.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body bgcolor="#00ced1">
<h1 align="center">欢迎！${user.username},登录成功！</h1>
<div align="center">
    <input type="button" value="新增" id="add"><br>
</div>
<table border="1" bgcolor="#00ced1" cellpadding="0" width="800" align="center">
    <tr>
        <td>序号</td>
        <td>品牌名称</td>
        <td>企业名称</td>
        <td>排序</td>
        <td>品牌介绍</td>
        <td>状态</td>
        <td>操作</td>
    </tr>
    <c:forEach items="${brands}" var="brand" varStatus="status">
        <tr align="center">
            <td>${status.count}</td>
            <td>${brand.brandName}</td>
            <td>${brand.companyName}</td>
            <td>${brand.ordered}</td>
            <td>${brand.description}</td>
            <c:if test="${brand.status ==1}">
                <td>启用</td>
            </c:if>
            <c:if test="${brand.status !=1}">
                <td>禁用</td>
            </c:if>
            <td><a href="/BrandTest/selectByIdServlet?id=${brand.id}">修改</a>&nbsp;&nbsp;<a href="/BrandTest/deleteByIdServlet?idd=${brand.id}">删除</a> </td>
        </tr>
    </c:forEach>
</table>
<script>
    document.getElementById("add").onclick=function () {
        location.href="/BrandTest/addBrand.jsp";

    }
</script>
</body>
</html>

5.运行测试

点击删除按钮，跳转到brand.jsp,数据已删除。
在这里插入图片描述
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插件

MVC模式和三层架构-登录注册增删改查案例-(详细案例)

一、准备环境

1.引入坐标

2.创建三层架构的包结构

3.数据库表 tb_brand和tb_login（数据库名：mybatis）

4.实体类 Brand

5.实体类 User

6.mybatis-config.xml

7.BrandMapper.xml

8.BrandMapper接口

9.UserMapper.xml

10.UserMapper接口

11.SessionFactory工具类

二、登录

1.用户登录及记住用户

1.编写UserMapper

2.编写UserService.java

3.编写login.jsp

4.login.css

5.编写loginServlet.java

6.编写brand.jsp

7.测试

三、注册

1.用户注册和验证码

1.编写UserMapper

2.编写UserService.java

3.编写register.jsp

4.编写register.css

5.编写registerServlet.java

6.运行测试

四、完成品牌数据的增删改查

2.查询所有

1.编写接口方法

2.编写BrandMapper.xml

3.编写service

4.编写Servlet

5.编写brand.jsp

7.测试

3.添加

1.编写BrandMapper接口

2.编写BrandService.java

3.编写brand.jsp

4.编写addBrand.jsp

5.编写AddServlet

6.测试运行

4.修改-回显数据

1.编写BrandMapper.java

2.编写BrandService.java

3.编写brand.jsp

4.编写SelectByIdServlet.java

5.编写update.jsp

6.运行测试

5.修改数据

1.编写BrandMapper.java

2.编写BrandService

3.修改update.jsp

4.编写updateServlet.java

5.测试运行

6.删除

1.编写BrandMapper.java

2.编写BrandService.java

3.编写deleteByIdServlet

4编写brand.jsp

5.运行测试

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