Struts2入门

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1.动态action

动态action处理方式通过请求Action对象中一个具体方法来实现动态操作，格式：userAction!add，请求其add()方法

下面通过一个简单的实例了解动态action和action的method属性。

创建FirstStruts类继承ActionSupport类，创建属性info并为其提供getter()和setter()方法

package com.gyj.struts;import com.opensymphony.xwork2.ActionSupport;public class FirstStruts extends ActionSupport {private String info;public String getInfo() {return info;}public void setInfo(String info) {this.info = info;}public String add()throws Exception{setInfo("添加用户信息");return "add";}public String update()throws Exception{System.out.println("update");setInfo("修改用户信息");return "update";}public String delete()throws Exception{setInfo("删除用户信息");return "delete";}}

index.jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><a href="FirstStruts1">add</a><a href="FirstStruts2">delete</a><a href="FirstStruts!update">update</a></body></html>

action对象处理后返回结果 first.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>    <%@taglib prefix="s" uri="/struts-tags"%> //使用Struts2标签必须加此代码<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><s:property value= "info"/></body></html>

在web.xml文件中声明过滤器

<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>

struts.xml文件配置

<struts><constant name="struts.enable.DynamicMethodInvocation" value="true" /><package name="myPackage" extends="struts-default" namespace="/"><!-- 动态调用action --><action name="FirstStruts" class = "com.gyj.struts.FirstStruts"><result name = "update">/first.jsp</result>               </action><!-- action method调用 --><action name="FirstStruts1" class = "com.gyj.struts.FirstStruts" method = "add"><result name = "add">/first.jsp</result></action><action name="FirstStruts2" class = "com.gyj.struts.FirstStruts" method = "delete"><result name = "delete">/first.jsp</result></action></package></struts>

动态action运行成功需要在Struts标签中添加属性<constant name="struts.enable.DynamicMethodInvocation" value="true" />将struts.enable.DynamicMethodInvocation设置为true才能运行。

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