如何将json对象转换为java


How to convert json object into java

下面是我从服务器获取响应的java代码。

    try
    {
       HttpClient httpclient = new DefaultHttpClient();
       HttpResponse response;
       HttpPost httppost = new HttpPost("http://www.def.net/my_script.php");
       response = httpclient.execute(httppost);
       HttpEntity entity = response.getEntity();
       String s = EntityUtils.toString(entity);
       JSONObject json = (JSONObject)new JSONParser().parse(s);
        System.out.println("News title= " + json.get("news_title"));
        System.out.println("Content= " + json.get("news_content"));
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }

以下是php脚本返回的内容。

{ "desktop_app_newsfeed":
[
 { "news_id": "132",
   "news_title": "test1",
   "news_content": "Lorem ipsum dolor sit amet Donec...", 
   "news_date": "2013-07-18 10:38:20" },
 { "news_id": "1",
   "news_title": "Hello world!",
   "news_content":"Lorem ipsum dolor sit amet Donec...",
    "news_date": "2013-04-22 17:54:05" 
 }
 ]
 }

如何在java中迭代以获得这样的变量赋值。

既然知道结构,就可以简单地抛出Object的检查结果,比如:

JSONObject json = (JSONObject) new JSONParser().parse(jsonString);
JSONArray feed = (JSONArray) json.get("desktop_app_newsfeed");
for (Object item : feed) {
    JSONObject news = (JSONObject) item;
    System.out.println("News title= " + news.get("news_title"));
    System.out.println("Content= " + news.get("news_content"));
}

如果您不确定结构,我建议使用调试器并检查json变量中的内容。

如果你正在寻找一种更通用、更稳健的方法,你必须查看其中一条评论中指出的Thomas W等文档。