JSON小例子
<script type="text/javascript" src="${pageContext.request.contextPath }/js/prototype.js"></script><script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.3.2.min.js"></script><script type="text/javascript">function testJson() {$.ajax({ type: "POST", url: "JsonServlet", data: "", success: function(msg){ var str = eval("("+msg+")"); var arr = str.res ; for(var i=0;i<arr.length;i++){ alert(arr.username); } }});}</script>public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out = response.getWriter();JSONArray res = new JSONArray();for(int i=0 ; i<5 ; i++){JSONObject obj = new JSONObject();try {obj.put("userid", "userid"+i);obj.put("username", "username"+i);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}res.put(obj);}JSONObject obj = new JSONObject();try {obj.put("res", res);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}out.print(obj);out.flush();out.close();} 例二：
<script type="text/javascript" src="${pageContext.request.contextPath }/js/prototype.js"></script><script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.3.2.min.js"></script><script type="text/javascript">function testJson() {var val = $("#sele").val();alert(val);$.post("JsonServlet",{userid:val},function(msg){ var str = eval("("+msg+")"); var arr = str.res ; for(var i=0;i<arr.length;i++){ alert(arr.username); } }); }</script></head> <body> <input type="button" value="測試JSON" > <select onchange="testJson();" id="sele"> <option value="0">用户0</option> <option value="1">用户1</option> <option value="2">用户2</option> <option value="3">用户3</option> <option value="4">用户4</option> </select></body>
JSONObject obj = new JSONObject();try {obj.put("userid", "userid"+userid);obj.put("username", "username"+userid);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}res.put(obj);JSONObject obj2 = new JSONObject();try {obj2.put("res", res);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}out.print(obj2);out.flush();out.close();}
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