本实例主要是解释在struts2下通过jquery的ajax从后台获取json数据,返回前台进行显示,记录学习的脚步!
前台 index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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 'index.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">
<script type="text/javascript" src="js/jquery-1.9.1.js"></script>
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
<!--
$(function(){
//使用response直接返回json数据
$("#send1").on("click",function(){
console.log("按钮的单击事件");
console.log("开始ajax");
$.ajax({
url:"json_test/json_jsonStream",
type:"get",
dataType:"json",
success:function(data){
console.log(data);
},
error:function(){
console.log("ajax出错");
}
});
});
//使用json插件返回,即设置result的type="json"
$("#send2").on("click",function(){
console.log("按钮2的单击事件");
console.log("开始ajax");
$.ajax({
url:"json_test/json_jsonStreamResult",
type:"get",
dataType:"json",
success:function(data){
console.log(data);
},
error:function(){
console.log("ajax出错");
}
});
});
});
//-->
</script>
</head>
<body>
<div id="disContent">
显示未发起ajax的信息
</div>
<input type="button" value="发起ajax1" id="send1" /><br/>
<input type="button" value="发起ajax2" id="send2" /><br/>
</body>
</html>
很简单 只是两个按钮 分别绑定单击事件 发起两个ajax
配置文件 struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<!-- 打开开发者模式 -->
<constant name="struts.devMode" value="true"></constant>
<constant name="struts.configuration.xml.reload" value="true"></constant>
<!-- 本实例用于测试struts2通过ajax返回json的两种方式 -->
<package name="json" namespace="/json_test" extends="struts-default,json-default">
<action name="json_*" class="com.undergrowth.action.JsonTest" method="{1}">
<result type="json">
<param name="root">returnJsonString</param>
</result>
</action>
</package>
</struts>
中间的Action JsonTest.java
package com.undergrowth.action;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONObject;
import org.apache.struts2.ServletActionContext;
public class JsonTest {
//用于使用json插件来返回的值
private String returnJsonString;
public String getReturnJsonString() {
return returnJsonString;
}
public void setReturnJsonString(String returnJsonString) {
this.returnJsonString = returnJsonString;
}
//ͨ通过response的输出流来返回json数据
public void jsonStream()
{
try {
//获取响应response
HttpServletResponse response=ServletActionContext.getResponse();
//设置响应的内容类型
response.setContentType("application/json;charset=utf-8");
//获取输出流
PrintWriter pw=response.getWriter();
String jsonString = fillJsonData();
pw.write(jsonString);
pw.flush();
pw.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//通过使用json插件来返回json
public String jsonStreamResult()
{
returnJsonString=fillJsonData();
return "success";
}
//填充json的数据
private String fillJsonData() {
Map<String, Object> jsonMap=new HashMap<String, Object>();
jsonMap.put("姓名", "李彦宏");
jsonMap.put("薪水", "20k");
JSONObject jsonObject=JSONObject.fromObject(jsonMap);
String jsonString=jsonObject.toString();
return jsonString;
}
}
2.测试
