Struts2动态Action详解-优快云博客

本文链接：https://blog.youkuaiyun.com/IT__jun/article/details/74332190

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。