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struts2中的動態方法呼叫DMI

通常,在struts2中,如果想執行特定的方法,往往會在struts.xml中,配置action的method屬性值為要執行的方法名,預設為execute方法。為了程式的擴充套件,這種方法不推薦,而是使用DMI方式,舉例如下(場景為使用者的增、刪、改):

(1)UserAction

package com.struts2.study.yy;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport {
	
	private static final long serialVersionUID = 1L;

	public String add(){
		System.out.println("-----add-----");
		return SUCCESS;
	}
	
	public String delete(){
		System.out.println("-----delete-----");
		return SUCCESS;
	}
	
	public String modify(){
		System.out.println("-----modify-----");
		return SUCCESS;
	}
}

(2)struts.xml
 <package name="user"  extends="struts-default" namespace="/">
    	<action name="user" class="com.struts2.study.yy.UserAction">
    			<result name="success">/user/success.jsp</result>
    	</action>
    </package>
(3)程式入口main.jsp
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
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>My JSP 'mainp.jsp' starting page</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="<%=path %>/user!add">add user</a><br>
    <a href="<%=path %>/user!delete">delete user</a><br>
    <a href="<%=path %>/user!modify">modify user</a>
</html>

(4)跳轉頁面success.jsp
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
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>My JSP 'success.jsp' starting page</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>
    success!
  </body>
</html>

(5)結果

當分別點選三個連結時,後臺會打出如下日誌:

-----add-----
-----delete-----
-----modify-----

  通過DMI方式,可以簡化配置資訊。