問題所在：
當我們想讓應用層和http之間的所有接口都采用json，這樣，客戶端代碼就可以純碎用javascript的對象來編寫，服務器打啊也可以純粹的用Java的對象來編寫。
我們使用的是post請求的方法，有些不同于get的方法！
客戶端html代碼：
<html><head><title>Hello Ajax version 5a</title><style type='text/css'>* { font-family: Tahoma, Arial, sans-serif; }#helloTitle{ color: #48f; }.sidebar{ background-color: #adf; color: navy; border: solid blue 1px; width: 180px; height: 200px; padding: 2px; margin: 3px; float: left;}</style><script type='text/javascript' src='prototype.js'></script><script type='text/javascript' src='json.js'></script><script type='text/javascript'>window.onload=function(){ $('helloBtn').onclick=function(){ var name=$('helloTxt').value; new Ajax.Request( "hello5a.jsp", { postBody:JSON.stringify({name:name}), onComplete:function(xhr){ var responseObj=JSON.parse(xhr.responseText); update(responseObj); } } ); }}function update(obj){ $('helloTitle').innerHTML="<h1>Hello, <b><i>"+obj.name+"</i></b></h1>"; var likesHTML='<h5>'+obj.initial+' likes...</h5><hr/>'; for (var i=0;i<obj.likes.length;i++){ likesHTML+=obj.likes[i]+"<br/>"; } $('likesList').innerHTML=likesHTML; var recipeHTML='<h5>'+obj.initial+'/'s favourite recipe</h5>'; for (key in obj.ingredients){ recipeHTML+=key+" : "+obj.ingredients[key]+"<br/>"; } $('ingrList').innerHTML=recipeHTML;}</script></head><body><div id='likesList' class='sidebar'><h5>Likes</h5><hr/></div><div id='ingrList' class='sidebar'><h5>Ingredients</h5><hr/></div><div><div id='helloTitle'><h1>Hello, stranger</h1></div><p>Please introduce yourself by entering your name in the box below</p><input type='text' size='24' id='helloTxt'></input> <button id='helloBtn'>Submit</button></div></body></html>jsp代碼：
<jsp:directive.page contentType="application/javascript" import="java.util.*,net.sf.json.*"/><%//read the request bodyString json=request.getReader().readLine(); //讀取post請求主體JSONObject jsonObj=new JSONObject(json);//解析json字符串String name=(String)(jsonObj.get("name"));//讀取解析后的對象jsonObj.put("initial",name.substring(0,1).toUpperCase()); //添加新的值String[] likes=new String[]{ "JavaScript", "Skiing", "Apple Pie" };jsonObj.put("likes",likes);Map ingredients=new HashMap();ingredients.put("apples","3kg");ingredients.put("sugar","1kg");ingredients.put("pastry","2.4kg");ingredients.put("bestEaten","outdoors");jsonObj.put("ingredients",ingredients);%><%=jsonObj%> <!--以json的形式輸出對象-->
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