对于DMI的理解我觉得还是看一些代码了解的快和记忆深刻，所以，我就从网上找了一段代码
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关于Action的方法调用：
1.Action执行的时候不一定要执行execute方法；
2.动态方法调用（DMI）的两种方式：
????a.通过配置文件struts.xml中action的method属性指定调用方法，如：
????????<action??method="调用方法名">；
????b.在URL中动态指定调用方法，使用感叹号“!”将action名和调用方法名分割开，如：
????????http://localhost:8080/Struts2_DMI/user!add
3.第一种方法需要配置很多action，一般使用第二种方法。
web.xml:
<?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>hello.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>
?
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.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" 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="user" namespace="/" extends="struts-default">
<action name="userAdd" class="cn.edu.ahau.mgc.struts2.action.UserAction" method="add">
<result name="addSuccess">/addSuccess.jsp</result>
</action>
<action name="userDelete" class="cn.edu.ahau.mgc.struts2.action.UserAction" method="delete">
<result name="deleteSuccess">/deleteSuccess.jsp</result>
</action>
<action name="user" class="cn.edu.ahau.mgc.struts2.action.UserAction">
<result name="addSuccess">/addSuccess.jsp</result>
<result name="deleteSuccess">/deleteSuccess.jsp</result>
</action>
</package>
</struts>
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?
UserAction.java:
package cn.edu.ahau.mgc.struts2.action;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport {
public String add() {
return "addSuccess";
}
public String delete() {
return "deleteSuccess";
}
}
?
index.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
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>DMI</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<a href="userAdd">UserAdd</a>
<a href="userDelete">UserDelete</a>
<br />
<br />
<a href="user!add">user!add</a>
<a href="user!delete">user!delete</a>
</body>
</html>
?
addSuccess.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
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>AddSuccess</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
User Add Success! <br>
</body>
</html>
?
deleteSuccess.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
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>DeleteSuccess</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
User Delete Success! <br>
</body>
</html>
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