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前置
0 项目地址
结构
1 创建web工程
参考链接
根据需要选择合适的tomcat
2 lib下导入jar包
struts、jakarta-oro
其中jakarta-oro和commons-validator是因为validation框架导入的，其余是struts所必须的。（当然也可以去我的项目里面下载jar）
3 写代码
1 创建struts项目
（1）LoginAction.java
package validate;
import com.opensymphony.xwork2.ActionSupport;
public class LoginAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private String a;
public String getA() {
return a;
}
public void setA(String a) {
this.a = a;
}
@Override
public String execute() throws Exception {
System.out.println("action方法execute");
if (getA().equals("admin")) {
return SUCCESS;
} else {
super.addActionError("用户名错误!");
return INPUT;
}
}
}
（2）struts的相关xml
利用include标签，将一个struts.xml配置文件分割成多个配置文件，比较清晰
struts-validate.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<!-- name package的名字 extends:继承的父package名称 -->
<!-- namespace:package命名空间。如目前login的是http://localhost:8080/login -->
<package name="validate" extends="struts-default" namespace="/">
<action name="login" class="validate.LoginAction" method="execute">
<result name="success">/WEB-INF/pages/validate/success.jsp</result>
<result name="input">/WEB-INF/pages/validate/index.jsp</result>
</action>
</package>
</struts>
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<include file="/validate/struts-validate.xml"/>
</struts>
（3）web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>struts-validation</display-name>
<welcome-file-list>
<welcome-file>/WEB-INF/pages/validate/index.jsp</welcome-file>
</welcome-file-list>
<!-- struts2 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
（4）jsp
- validate="true"是开启验证，创建struts项目时可将此句删除
index.jsp
success.jsp<%@ page contentType="text/html;charset=UTF-8" language="Java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <body> 登录 <s:form action="login" validate="true" method="post" namespace="/"> <s:textfield name="a" id="a" label="a"></s:textfield> <s:textfield name="b" id="b" label="b"></s:textfield> <s:submit value="提交"></s:submit> </s:form> <s:actionerror /> </body> </html><%@ page contentType="text/html;charset=UTF-8" language="Java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <body> 成功 </body> </html>2 添加validate
1 相关知识
- 1 validation.xml和*Action.java放在一起
- 2 validation.xml命名规则
（1）<ActionClassName>-validation.xml
ActionClassName放的是要验证Action类的名字
（2）<ActionClassName>-<actionName>-validation.xml
actionName指struts.xml里面配置的action name，如LoginAction-login-validation.xml - 3 s:form具备输出校验错误的能力
- 4 前面struts.xml配置input，是为了让校验失败后，返回index.jsp
2 代码
- 对b的校验采取的是自定义validator
LoginAction-validation.xml
BValidator.java<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.2//EN" "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd"> <validators> <field name="a"> <field-validator type="requiredstring"> <message>此项必输</message> </field-validator> <field-validator type="stringlength"> <param name="minLength">3</param> <message>长度必须大于3</message> </field-validator> </field> <field name="b"> <field-validator type="bValidator"> <param name="b">b</param> <message>bbbbb</message> </field-validator> </field> </validators>
validators.xmlpackage validate; import com.opensymphony.xwork2.validator.ValidationException; import com.opensymphony.xwork2.validator.validators.FieldValidatorSupport; public class BValidator extends FieldValidatorSupport { private String b; @Override public void validate(Object object) throws ValidationException { //获取字段名 String fieldName = super.getFieldName(); String value = (String)super.getFieldValue(fieldName,object); System.out.println("自定义validator"+fieldName+","+value); if(value == null || value == "") { //使LoginAction-validation.xml中b的message可以显示 this.addFieldError(fieldName, object); //添加校验错误，和上一条语句任选其一即可 this.getValidatorContext().addFieldError(fieldName, this.getValidatorContext().getText(value+"b为空"+b)); return; } } }<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.2//EN" "http://struts.apache.org/dtds/xwork-validator-config-1.0.dtd"> <!-- 此DOCTYPE和default.xml中的一致 --> <validators> <!-- 验证器注册 --> <validator name = "bValidator" class = "validate.BValidator"/> </validators>
4 启动中遇到的问题
（1）Caught Exception while registering Interceptor class org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor - interceptor - jar:file:/D:/eclipse/tools/apache-tomcat-7.0.86-windows-x64/apache-tomcat-7.0.86/wtpwebapps/struts-validation/WEB-INF/lib/struts2-core-2.3.37.jar!/struts-default.xml:222:127
解决：配置离线dtd(dtd资源)，当然也可以在我的代码中找，就在src目录下面
配置方法：参考
（2）警告: No configuration found for the specified action: 'Login' in namespace
若是struts中配置了namespace="/"，但s:form中没有配置，则会出现
（3）Local DTD is missing for publicID: -//OpenSymphony Group//XWork Validator 1.0.2
解决：更换LoginAction-validation.xml开头为
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.2//EN" "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">
提升
struts2权威指南pdf完整版+源代码
