struts2-json-plugin插件的使用

一、编写Action类

/**
 * AjaxJsonAction.java
 * action
 * Function： TODO 
 *
 *   version    date      author
 * ──────────────────────────────────
 *   	1.0	 2013-9-21    songjy
 *
 * Copyright (c) 2013, TNT All Rights Reserved.
*/

package action;

import java.util.HashMap;
import java.util.Map;

import com.opensymphony.xwork2.ActionSupport;

import entity.User;

/**
 * ClassName:AjaxJsonAction
 *
 * @author   songjy
 * @version  1.0
 * @since    v1.0
 * @Date	 2013-9-21	下午5:42:49
 */

public class AjaxJsonAction extends ActionSupport {

	private static final long serialVersionUID = -2309225335616212699L;
	
	private static Map<Integer, User> users = new HashMap<Integer, User>();
	
	static {
		users.put(1, new User(1, "张三"));
		users.put(2, new User(2, "李四"));
	}

	public String json(){
		
		if(users.containsKey(id))
			user = users.get(id);
		else
			user = new User();
		
		return "json";
	}
	
	private int id;
	private User user;
	
	public int getId() {
		return id;
	}
	
	public void setId(int id) {
		this.id = id;
	}
	
	/*user设置了getXXX，json插件将User转为json*/
	public User getUser() {
		return user;
	}
	
	public void setUser(User user) {
		this.user = user;
	}
}

二、在struts.xml中配置Action类

<!-- 必须继承json-default，可参阅struts2-json-plugin.jar包中struts-plugin.xml配置文件 -->
	<package name="ajax" extends="json-default">
		<action name="*" class="action.AjaxJsonAction" method="{1}">
			<result name="{1}" type="json"/><!-- type必须是json -->
		</action>
	</package>

三、编写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">
<script type="text/javascript" src="js/jquery-1.10.2.js"></script>
<title>struts2-json-plugin示例</title>
<script type="text/javascript">
	function load_user() {

		var id = encodeURIComponent($("#id").val());

		$.post("json.do", {
			id : id
		}).done(function(data) {
			alert(data.user.id + "," + data.user.name +"," +data.id);
		});

	}
</script>
</head>
<body>
	id：
	<input name="id" type="text" id="id">
	<br />
	<input type="button" onclick="javascript:load_user();" value="获取用户信息" />
</body>
</html>

四、测试

struts2-json-plugin插件的使用

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