案例13 Spring MVC参数传递案例-阿里云开发者社区

案例13 Spring MVC参数传递案例

2023-08-15 57

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简介： 基于Spring MVC实现HttpServletRequest、基本数据类型、Java Bean、数组、List、Map、JSON方式的参数传递。

基于Spring MVC实现HttpServletRequest、基本数据类型、Java Bean、数组、List、Map、JSON方式的参数传递。

1. 创建项目

选择Maven快速构建web项目，项目名称为case13-springmvc02。

2. 配置Maven依赖

<?xmlversion="1.0" encoding="UTF-8"?><projectxmlns="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>com.wfit.springmvc</groupId><artifactId>springmvc02</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><!--spring mvc--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.3.25</version></dependency><!--servlet--><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><!--jackson--><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.12.3</version></dependency></dependencies></project>

3. 更新Maven仓库

4. 创建java和resources目录

src.main路径下，执行new – Directory操作，选择java、resources后，执行回车键。

5. 创建Spring MVC配置文件

<?xmlversion="1.0" encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"><!--开启注解--><context:component-scanbase-package="com.wfit"/><!--启用mvc--><mvc:annotation-driven></mvc:annotation-driven></beans>

6. 配置web.xml

在web.xml中配置DispatcherServlet。

<!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app><!--解决POST中文乱码问题 过滤器--><filter><filter-name>encoding</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>utf-8</param-value></init-param></filter><filter-mapping><filter-name>encoding</filter-name><url-pattern>/*</url-pattern></filter-mapping><!--配置前端控制器DispatcherServlet--><servlet><servlet-name>dispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!--加载SpringMVC文件--><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring-mvc.xml</param-value></init-param><!--启动容器时加载servlet--><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>dispatcherServlet</servlet-name><!--表示拦截所有请求--><url-pattern>/</url-pattern></servlet-mapping></web-app>

7. 创建Student实体类

src.main.java.com.wfit.entity目录下创建Student.java。

publicclassStudent {
publicStringid;
publicStringname;
publicintage;
publicStringgetId() {
returnid;
    }
publicvoidsetId(Stringid) {
this.id=id;
    }
publicStringgetName() {
returnname;
    }
publicvoidsetName(Stringname) {
this.name=name;
    }
publicintgetAge() {
returnage;
    }
publicvoidsetAge(intage) {
this.age=age;
    }
@OverridepublicStringtoString() {
return"Student{"+"id='"+id+'\''+", name='"+name+'\''+", age="+age+'}';
    }
}

8. 创建ParamController类

在src.main.java.com.wfit.param目录下创建ParamController.java。

HttpServletRequest参数传递

@Controller@RequestMapping("/param")
publicclassParamController {
/***  通过HttpServletRequest接收参数*/@RequestMapping("/servlet")
publicvoidservlet(HttpServletRequestrequest, HttpServletResponseresponse) throwsIOException {
Stringname=request.getParameter("name");
System.out.println("name="+name);
PrintWriterwriter=response.getWriter();
writer.print("hello "+name);
writer.flush();
writer.close();
    }
}

基本数据类型参数传递

基本数据类型以及他们的包装类。

/*** 使用基本数据类型和String类型*/@RequestMapping(value="/simple",produces="text/plain;charset=UTF-8")
@ResponseBodypublicStringsimple(Stringid,Stringname,intage){
Stringstr=id+","+name+","+age;
System.out.println(str);
returnstr;
}

Java Bean参数传递

@Controller@RequestMapping("/param")
publicclassParamController {
/*** JavaBean传递参数*/@RequestMapping(value="/bean",method=RequestMethod.POST,
produces="text/plain;charset=UTF-8")
@ResponseBodypublicStringbean(Studentstudent){
System.out.println(student);
returnstudent.toString();
    }
}

数组参数传递

@Controller@RequestMapping("/param")
publicclassParamController {
/*** 数组参数*/@RequestMapping(value="/array",method=RequestMethod.POST)
@ResponseBodypublicStringarray(String[] hobbies){
for(Stringhobby : hobbies){
System.out.println(hobby);
    }
return"success";
}
}

List参数传递

@Controller@RequestMapping("/param")
publicclassParamController {
/*** List参数*/@RequestMapping(value="/list",method=RequestMethod.POST)
@ResponseBodypublicStringlist(@RequestParamList<String>hobbyList){
hobbyList.forEach(hobby->System.out.println(hobby));
return"success";
}
}

Map参数传递

@Controller@RequestMapping("/param")
publicclassParamController {
/*** Map参数*/@RequestMapping(value="/map",method=RequestMethod.POST)
@ResponseBodypublicStringmap(@RequestParamMap<String,Object>map){
System.out.println(map);
return"success";
}
}

9. 创建JsonController类

在src.main.java.com.wfit目录下创建JsonController类，实现JSON参数转成Java Bean、Map、List等引用类型。

Json Bean参数传递

@Controller@RequestMapping("/json")
publicclassJsonController {
/*** json bean*/@RequestMapping(value="/bean",method=RequestMethod.POST)
@ResponseBodypublicObjectbean(@RequestBodyStudentstudent){
System.out.println(student);
Map<String,Object>map=newHashMap<String,Object>();
map.put("code",200);
map.put("msg","success");
map.put("data",student.toString());
returnmap;
    }
}

Json Map参数传递

@Controller@RequestMapping("/json")
publicclassJsonController {
/*** json map*/@RequestMapping(value="/map",method=RequestMethod.POST)
@ResponseBodypublicObjectmap(@RequestBodyMap<String,Object>jsonMap){
System.out.println(jsonMap);
Map<String,Object>map=newHashMap<String,Object>();
map.put("code",200);
map.put("msg","success");
map.put("data",jsonMap);
returnmap;
    }
}

Json List参数传递

@Controller@RequestMapping("/json")
publicclassJsonController {
/*** json list*/@RequestMapping("/list")
@ResponseBodypublicObjectlist(@RequestBodyList<Student>studentList){
System.out.println(studentList);
Map<String,Object>map=newHashMap<String,Object>();
map.put("code",200);
map.put("msg","success");
map.put("data",studentList);
returnmap;
    }
}