java怎么读取json数据呢

wangmeiling00 2011-08-26 08:23:17

java怎么读取json数据呢

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凌风雪雕 2011-08-27

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这里就是json字符串，还算比较复杂的一个了吧 {"icache":[{"cache_server_address":"10.88.53.198:11201","app_name":null,"cache_server_id":null,"token":null},{"cache_server_address":"10.88.53.198:11200","app_name":null,"cache_server_id":null,"token":null}]}

先到http://download.csdn.net/source/3512951下载jar包，然后

private static List<String> getListFromJson(String json) {

JSONObject ObjList;
List<String> list = new ArrayList<String>();
try {
ObjList = new JSONObject(json);
if (ObjList.has("icache")) {
JSONArray jArray = ObjList.getJSONArray("icache");
for (int i = 0; i < jArray.length(); i++) {
JSONObject jObj = (JSONObject) jArray.get(i);
list.add(jObj.getString("cache_server_address"));
}
}
} catch (Exception e) {
logger.error(e);
list = null;
} finally {
logger.info("ServerList is " + list);
return list;
}
}

凌风雪雕 2011-08-27

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http://download.csdn.net/source/3512951

liyang1271989 2011-08-27

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好多都有json,
例如： struts2 xwork 等框架都包含，
单独有json-lib这个开源的关联的比较多，要是用jdk1.4会出错，官网发布的jdk1.4相应的包有bug，不知道现在改了没

还有一种org.json 这是轻量级的，可以使用！

现在好多json的开源包，lz可以找一种试试

huntor 2011-08-26

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找个第三方库如 jackson / gson 等。

luohuijun619 2011-08-26

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看个js的处理

{   

     userName: "nihao",   

     sex: "male",   

     age: "23"  

}

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <!-- 导入两个js文件 -->

    <script type="text/javascript" src="./ajax.js"></script>

    <script type="text/javascript" src="./prototype1.6.js"></script>

    <title>jsontest.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=GB18030">

    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->



    <script type="text/javascript">

        var req = createXMLHttpRequest();

	    function startRequest(){

		    try{

		        req.onreadystatechange = handleStateChange;

		        req.open("GET", "user.txt", true);

		        req.send(null);    

		    }catch(exception){

		        alert("");

		    }  

	    }

		function handleStateChange(){    

	    	if(req.readyState == 4){        

	       		 if (req.status == 200 || req.status == 0){

		            // 取得返回字符串

		            var resp = req.responseText;

		            // 构造返回JSON对象的方法

		            var func = new Function("return " + resp);

		            // 得到JSON对象

		            var json = func( );

		            // 显示返回结果

		            alert("userName: " + json.userName + " " + "sex: " + json.sex + " " + "age: " + json.age);

	              }

	         }

	     }	    

    </script>

  </head>  

  <body>

    <div>

        <input type="button" value="json's value"

                onclick="startRequest();" />

    </div>

  </body>

</html>

http://www.iteye.com/topic/231788

luohuijun619 2011-08-26

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json最好用js读取，非常方便，就跟处理对象一样简单

package test;



import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;



public class StrJson1 {



	public static void main(String[] args) {

		String json = "{'name': '呵呵','array':[{'a':'111','b':'222','c':'333'},{},{'a':'999'}],'address':'上海'}";

		   try {

		    JSONObject jsonObject = new JSONObject(json);

		    String name = jsonObject.getString("name");

		    String address = jsonObject.getString("address");



		    System.out.println("name is:" + name);



		    System.out.println("address is:" + address);

		   

		    JSONArray jsonArray = jsonObject.getJSONArray("array");

		   

		    for (int i = 0; i < jsonArray.length(); i++) {

		     System.out.println("item " + i + " :" + jsonArray.getString(i));

			      try{

			     	JSONObject jsonObject333 = new JSONObject(jsonArray.getString(i));

					String aaaa = jsonObject333.getString("a");

					System.out.println("----------"+aaaa);

			      }catch(Exception e){

				  }

		    }

		   } catch (JSONException e) {

		    e.printStackTrace();

		   }





	}

}