javascript JSON操作入门实例

var myobj = originalRequest.responseText.parseJSON();
alert(myobj.name);
}

prototype-1.5.1.js中提供了JSON的方法，String.evalJSON(), 可以不使用json.js, 修改上面的方法
js 代码

function jsonResponse(originalRequest) {
alert(originalRequest.responseText);
var myobj = originalRequest.responseText.evalJSON(true);
alert(myobj.name);
}

JSON还提供了java的jar包 http://www.json.org/java/index.html API也很简单，下面举个例子
在javascript中填加请求参数
js 代码

function sendRequest() {
var carr = new Car("Dodge", "Coronet R/T", 1968, "yellow");
var pars = "car=" + carr.toJSONString();
var url = "/MyWebApp/JSONTest1";
var mailAjax = new Ajax.Request(
url,
{
method: 'get',
parameters: pars,
onComplete: jsonResponse
}
);
}

使用JSON请求字符串就可以简单的生成JSONObject并进行解析,修改servlet添加JSON的处理(要使用json.jar)
java 代码

private void doService(HttpServletRequest request, HttpServletResponse response) throws IOException {
String s3 = request.getParameter("car");
try {
JSONObject jsonObj = new JSONObject(s3);
System.out.println(jsonObj.getString("model"));
System.out.println(jsonObj.getInt("year"));
} catch (JSONException e) {
e.printStackTrace();
}
response.getWriter().print("{ "name": "Violet", "occupation": "character" }");
}
    
同样可以使用JSONObject生成JSON字符串，修改servlet
java 代码

private void doService(HttpServletRequest request, HttpServletResponse response) throws IOException {
String s3 = request.getParameter("car");
try {
JSONObject jsonObj = new JSONObject(s3);
System.out.println(jsonObj.getString("model"));
System.out.println(jsonObj.getInt("year"));
} catch (JSONException e) {
e.printStackTrace();
}
JSONObject resultJSON = new JSONObject();
try {
resultJSON.append("name", "Violet")
.append("occupation", "developer")
.append("age", new Integer(22));
System.out.println(resultJSON.toString());
} catch (JSONException e) {
e.printStackTrace();
}
response.getWriter().print(resultJSON.toString());
}
    
js 代码

function jsonResponse(originalRequest) {
alert(originalRequest.responseText);
var myobj = originalRequest.responseText.evalJSON(true);
alert(myobj.name);
alert(myobj.age);
}