struts2-Action-优快云博客

本文介绍Struts2框架中视图返回机制的工作原理。通过用户自定义的Action，可以根据返回的字符串找到对应的配置项来决定视图内容。Action可以通过普通Java类、实现Action接口或继承ActionSupport的方式实现。

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<?xml version="1.0" encoding="GB18030" ?>
<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
    <%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />
<title>Insert title here</title>
</head>
<body>
具体视图的返回可以由用户自己定义的Action来决定<br />
具体的手段是根据返回的字符串找到对应的配置项，来决定视图的内容<br />
具体Action的实现可以是一个普通的java类，里面有public String execute方法即可<br />
或者实现Action接口<br />
不过最常用的是从ActionSupport继承，好处在于可以直接使用Struts2封装好的方法<br />
</body>
</html>


<?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.enable.DynamicMethodInvocation" value="false" />


    <include file="example.xml"/>


    <package name="default" namespace="/" extends="struts-default">
        <default-action-ref name="index" />
        <action name="index">
            <result type="redirectAction">
                <param name="actionName">HelloWorld</param>
                <param name="namespace">/example</param>
            </result>
        </action>
    </package>
	 -->
    <!-- Add packages here -->
    <constant name="struts.devMode" value="true" />
    <package name="front" extends="struts-default" namespace="/">
        <action name="index" class="com.hugui.struts2.front.action.IndexAction1">
            <result name="success">/ActionIntroduction.jsp</result>
        </action>
    </package>

</struts>


package com.hugui.struts2.front.action;

public class IndexAction1 {
	public String execute() {
		return "success";
	}
}


package com.hugui.struts2.front.action;

import com.opensymphony.xwork2.Action;

public class IndexAction2 implements Action {
	@Override
	public String execute() {
		return "success";
	}
}


package com.hugui.struts2.front.action;

import com.opensymphony.xwork2.ActionSupport;

public class IndexAction3 extends ActionSupport {

	@Override
	public String execute() {
		return "success";
	}
}


<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	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_2_5.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>