struts2 中继承 ActionSupport 类

1.class代码

HelloWorldAction

package com.zhaker.action;
import com.opensymphony.xwork2.ActionSupport;
  
public class HelloWorldAction extends ActionSupport {  
    private String account;  
    private String password;  
    private String submitFlag;  
    public String execute() throws Exception {  
        this.businessExecute();  
        return "toWelcome";  
    }  
    public void validate(){  
        if(account==null || account.trim().length()==0){  
            this.addFieldError("account", "账号不可以为空");  
        }  
        if(password==null || password.trim().length()==0){  
            this.addFieldError("password", "密码不可以为空");  
        }
        if(password!=null && !"".equals(password.trim()) && password.trim().length()<6){  
            this.addFieldError("password", "密码长度至少为6位");  
        }  
    }  
    /** 
     * 示例方法，表示可以执行业务逻辑处理的方法， 
     */  
    public void businessExecute(){  
        System.out.println("用户输入的参数为==="+"account="+account+",password="+password+",submitFlag="+submitFlag);  
    }
    public String getAccount() {
        return account;
    }
    public void setAccount(String account) {
        this.account = account;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getSubmitFlag() {
        return submitFlag;
    }
    public void setSubmitFlag(String submitFlag) {
        this.submitFlag = submitFlag;
    }  
    
}

2.中转
struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
  <!DOCTYPE struts PUBLIC
  "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
  "http://struts.apache.org/dtds/struts-2.0.dtd">
  
  <struts>
   <constant name="struts.custom.i18n.resources" value="messages_en_US"/>
     <package name="default" extends="struts-default">
 
         <action name="t1" class="com.zhaker.action.RegisterAction">
 
             <result name="success">/index.jsp</result>
         </action>
    </package> 
     <package name="helloworld"  extends="struts-default">  
        <action name="helloworldAction" class="com.zhaker.action.HelloWorldAction">  
            <result name="toWelcome">/index.jsp</result> 
             <result name="input">/register.jsp</result>   
           
        </action>  
        
    </package> 
 </struts>

3.添加过滤器

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 

 <welcome-file-list>
 <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 
 <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.登录页面
register.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"  
    pageEncoding="utf-8"%> 
<%@ taglib prefix="s" uri="/struts-tags"%> 
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; utf-8">  
<title>Insert title here</title>  
<style type="text/css">
ul,li {
    list-style-type:none;
    margin:0px;
    float:left;
}
</style>
</head>  
<body>  
   
<form action="helloworldAction.action" method="post"> 
    <input type="hidden" name="submitFlag" value="login"/>  
    <div> 
        <font color=red><s:fielderror fieldName="account"/></font>
        <br/>
          账号:<input type="text" name="account">
    </div>
    <div>
        <font color=red><s:fielderror fieldName="password"/></font>
        <br/>
            密码:<input type="password" name="password">
    </div>
    <input type="submit" value="提交">  
</form>  
  
</body>  
</html>

5.显示页面
Index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>显示页面</title>
	
  </head>
  
  <body>
       
    用户名：${requestScope.name}	<br/>
  性别   ${requestScope.sex}<br/>
  
  
 
  dispatcher:用来转向页面,通常处理JSP.dispatcher:用来转向页面,通常处理JSP.dispatcher:用来转向页面,通常处理JSP.dispatcher:用来转向页面,通常处理JSP.dispatcher:用来转向页面,通常处理JSP.</body>
</html>

以上就是struts2中继承ActionSupport类的全部代码。
对了，特别重要的一点，不要忘了加jar包
struts2 中继承 ActionSupport 类