JSON AJAX
JavaScript Json http://www.dreamdu.com/blog/2008/10/19/json_in_javascript/JSON :http://www.json.org/json-zh.html
<script type="text/javascript" src="js/json2.js"></script><script type = "text/javascript">var xmlHttp;/*创建XMLHttpRequest对象 兼容Firefox，Ie浏览器*/function createXMLHttpRequest(){ if(window.ActiveXObject){ xmlHttp = newActiveXObject( " Microsoft.XMLHTTP " ); } else if(window.XMLHttpRequest){ xmlHttp = new XMLHttpRequest(); }}/*发出Ajax请求并调用处理函数*/ functiondoJSON(){ var car = getCarObject(); // Use the JSON JavaScript library to stringify the Car object varcarAsJSON=JSON.stringify(car); alert( " Car object as JSON:\n" +carAsJSON + " type "+typeof carAsJSON); varurl= "JSONExample.json"; createXMLHttpRequest(); xmlHttp.open("POST" , url,true); xmlHttp.onreadystatechange=handleStateChange; xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); xmlHttp.send(carAsJSON);}/*判断XMLHttpRequest对象的返回状态*/ functionhandleStateChange(){ if (xmlHttp.readyState== 4 ){ if (xmlHttp.status== 200 ){ parseResults(); } }}/*处理从服务器返回的结果*/functionparseResults(){ var result = xmlHttp.responseText; alert(result +" before JSON.parse(String) type "+typeof result); var resultObj = JSON.parse(result); alert(resultObj.name +" "+resultObj.height+" after JSON.parse(String) type"+typeof resultObj); varresponseDiv=document.getElementById("serverResponse"); if (responseDiv.hasChildNodes()){ responseDiv.removeChild(responseDiv.childNodes[ 0 ]); } varresponseText=document.createTextNode(xmlHttp.responseText); responseDiv.appendChild(responseText);}/*获得一个Car对象*/function getCarObject(){ return new Car("Dodge","Coronet R/T",1968,"yellow");}/*Car对象*/functionCar(make, model, year, color){ this.make=make; this.model=model; this.year=year; this.color=color;}</script> <br/><br/><form action="#"><input type="button" value="Click here to send JSON data to the server" /></form><h2>Server Response:</h2><div id="serverResponse"></div>package com.nstars;import java.io.BufferedReader;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.json.JSONException;import org.json.JSONObject;public class JSONExample extends HttpServlet {publicvoid doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {doPost(request,response);}/*响应Post请求*/public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {String json = readJSONStringFromRequestBody(request);// Use the JSON-Java binding library to create a JSON object in JavaJSONObject jsonObject = null;try {jsonObject = new JSONObject(json);} catch (Exception e) {e.printStackTrace();}String responseText = "";try {responseText = " You have a" + jsonObject.getInt("year")+ " " + jsonObject.getString("make") + " "+ jsonObject.getString("model") + " " + "that is"+ jsonObject.getString("color") + "in color. ";} catch (JSONException e) {e.printStackTrace();}JSONObject jsonObj = new JSONObject();try {jsonObj.putOnce("name", "边苏涛");jsonObj.put("height", 176);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}response.setContentType("text/xml");response.setCharacterEncoding("UTF-8");response.getWriter().print(jsonObj);}/*从request对象中读取JSON对象字符串*/private String readJSONStringFromRequestBody(HttpServletRequest request) {StringBuffer json = new StringBuffer();String line = null;try {BufferedReader reader = request.getReader();while ((line = reader.readLine()) != null) {json.append(line);}} catch (Exception e) {System.out.println(" Error reading JSON string:" + e.toString());}return json.toString();}}
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