JQuery的学习：JQueryAjax的学习

原创 于 2013-09-04 16:59:52 发布 · 727 阅读 · 2 ·
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JQuey中的Ajax：

三层：$—>JQuery对象

最底层：$.ajax();

中间层：$.load('url',data,callback)

$.get(url,data,callback,type) :callback 回调函数 type 回调函数指定接收数据的返回类型

$.post(url,data,callback,type)

最上层：$.getJSON();



$.load('url',data,callback) 的学习：


index.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" contentType="text/html; charset=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">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->


	<script type="text/javascript" src="<%=path %>/js/jquery-1.4.1.js"></script>
	<script type="text/javascript">
		$(function(){
			alert('----------');
			$("#btnLoad").click(function(){
				$("#divComment").load("<%=path%>/jsp/Comment.html");
			});
		});
	</script>
  </head>
  
  <body>
    <h1>楼主：快来看啦，外星人来了</h1>
    <input type="button" value="加载评论" id="btnLoad">
    <div id="divComment" style="border: 1px groove red; "></div>
  </body>
</html>

/js/jquery-1.4.1.js

/jsp/Comment.html:

<!DOCTYPE html>
<html>
  <head>
    <title>Comment.html</title>
	
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    
    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

  </head>
  
  <body>
    <div id="comment">
    	<ul>
    		<li>发言人:<a>李四</a></li>
    		<div>沙发</div>
    		<li>发言人:<a>王五</a></li>
    		<div>板凳</div>
    		<li>发言人:<a>李四</a></li>
    		<div class="selLoad">哈哈，不错，很精彩</div>
    	</ul>
    </div>
  </body>
</html>


$.get(url,data,callback,type)、$.post(url,data,callback,type) 、$.getJSON();的学习：


index.jsp:

	<script type="text/javascript" src="<%=path %>/js/jquery-1.4.1.js"></script>
	<script type="text/javascript">
 		$(function(){
				$("#btnLoad").click(function(){
					$.post("demo",{usName:$("#usName").val(),message:$("#mssage").val()},function(data,textStatus){
					//$("#divComment").append(data);
					//遍历data集合数据
					$.each(data,function(property,item){alert(item.usName+":"+item.msg);});
					//$.each(data,function(property,item){alert(property+":"+item);});
					},"json");
				});

							  
				$("#btnLoad").click(function(){
					$.getJSON("student.json",function(data){
						$.each(data,function(i,item){alert(item.usName+" "+item.usSex+" "+item.usAge);});
				});
		});
	</script>
  </head>
  
  <body>
    <h1>楼主：快来看啦，外星人来了</h1>
    <input type="button" value="加载评论" id="btnLoad">
    游客<input type="text" size="10" id="usName"/>说话:<input type="text" size="20" id="mssage"/>
    <div id="divComment" style="border: 1px groove red; "></div>
  </body>
</html>



web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
	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_3_0.xsd">
  <display-name></display-name>	
  <servlet>
  	<servlet-name>AjaxDemo</servlet-name>
  	<servlet-class>com.zuxia.yc42.servlet.AjaxDemo</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>AjaxDemo</servlet-name>
  	<url-pattern>/demo</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>



com.zuxia.yc42.servlet
 ——public class AjaxDemo extends HttpServlet ：

package com.zuxia.yc42.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JSONString;
import net.sf.json.util.JSONStringer;

import com.zuxia.yc42.po.UserInfo;

public class AjaxDemo extends HttpServlet 
{
	public void doPost(HttpServletRequest request,HttpServletResponse response)
	{
		
		response.setCharacterEncoding("UTF-8");
		response.setContentType("");
		System.out.println(request.getContentType()+"\t"+request.getCharacterEncoding());
		String usName = null;
		String msg = null;
		try {
			 usName = new String((request.getParameter("usName").getBytes("ISO-8859-1")),"UTF-8");
		
			 msg = new String((request.getParameter("message").getBytes("ISO-8859-1")),"UTF-8");
		
			 List<UserInfo> list =new ArrayList<UserInfo>();
			 UserInfo userInfo = new UserInfo();
			 userInfo.setUsName(usName);
			 userInfo.setMsg(msg);
			 
			 list.add(userInfo);
			 
			 
			 String jsonString ="{'usName':'aaa','msg':'TTTTTTTT'}";
			 responseOutWithJson(response,list);
		
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		
		
	}

	public void doGet(HttpServletRequest request,HttpServletResponse response)
	{
		System.out.println("doGet方法被调用");
		doPost(request,response);
	}
	
	/** 
	 * 以JSON格式输出 
	 * @param response 
	 */  
	protected void responseOutWithJson(HttpServletResponse response,  
	        Object responseObject) {  
	    //将实体对象转换为JSON Object转换 
		//JSONObject responseJSONObject = JSONObject.fromObject(responseObject); 
		JSONArray responseJSONObject = JSONArray.fromObject(responseObject); 
		
	    response.setCharacterEncoding("UTF-8");  
	    response.setContentType("application/json; charset=UTF-8");  
	    PrintWriter out = null;  
	    try 
	    {  
	        out = response.getWriter();  
	        out.append(responseJSONObject.toString());   
	        System.out.println(responseJSONObject.toString());
	    } catch (IOException e) {  
	        e.printStackTrace();  
	    } finally {  
	        if (out != null) {  
	            out.close();  
	        }  
	    }  
	}  
}


com.zuxia.yc42.po

  ——public class UserInfo：

package com.zuxia.yc42.po;

public class UserInfo 
{
	private String usName;
	private String msg;
	public String getUsName() {
		return usName;
	}
	public void setUsName(String usName) {
		this.usName = usName;
	}
	public String getMsg() {
		return msg;
	}
	public void setMsg(String msg) {
		this.msg = msg;
	}
	
	

}



WebRoot

——student.json：

[
	{
		"usName":"xiaoming",
		"usSex":"nan",
		"usAge":"22"
	},
	{
		"usName":"xiaoli",
		"usSex":"nv",
		"usAge":"18"
	}
]




以下是index.jsp页面代码集合：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" contentType="text/html; charset=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">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	<script type="text/javascript" src="<%=path %>/js/jquery-1.4.1.js"></script>
	<script type="text/javascript">
 		$(function(){
// 			alert('----------');
// 			$("#btnLoad").click(function(){
// 				$("#divComment").load("<%=path%>/jsp/Comment.html");
// 			});
			
			$("#btnLoad").click(function(){
				$.post("demo",{usName:$("#usName").val(),message:$("#mssage").val()},function(data,textStatus){
					//$("#divComment").append(data);
					//遍历data集合数据
					$.each(data,function(property,item){alert(item.usName+":"+item.msg);});
					//$.each(data,function(property,item){alert(property+":"+item);});
				},"json");
			});
			  
			$("#btnLoad").click(function(){
				$.getJSON("student.json",function(data){
					$.each(data,function(i,item){alert(item.usName+" "+item.usSex+" "+item.usAge);});
				});
			});
		});
	</script>
  </head>
  
  <body>
    <h1>楼主：快来看啦，外星人来了</h1>
    <input type="button" value="加载评论" id="btnLoad">
    游客<input type="text" size="10" id="usName"/>说话:<input type="text" size="20" id="mssage"/>
    <div id="divComment" style="border: 1px groove red; "></div>
  </body>
</html>


有需要该JQueryAjax使用到的jar包的可以去我的资源页下载~





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