转换从URL中获取JSON对象从URL中拉出

Question

我想从一个字符串中获取JSON数据，这是从我从URL中拉下来的数据创建的。到目前为止，这是我在我的代码：

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    final TextView tv = (TextView)findViewById(R.id.result); 

     StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
     StrictMode.setThreadPolicy(policy); 

     String username = "username"; 
     String password = "password"; 
     String url = "http://www.example.com/api/core/v1/my/"; 
     String unp = username+":"+password; 


     class MyUser { 
       public String firstName; 
       public String lastName; 
     } 


     try { 
      HttpClient client = new DefaultHttpClient(); 
      HttpGet header = new HttpGet(url); 
      String encoded_login = Base64.encodeToString(unp.getBytes(), Base64.NO_WRAP); 
      header.setHeader(new BasicHeader("Authorization", "Basic "+encoded_login)); 
      HttpResponse response = client.execute(header); 
      HttpEntity entity = response.getEntity(); 

      BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent())); 
      for (String line; (line = reader.readLine()) != null;line.replaceAll("throw 'allowIllegalResourceCall is false.';", "")) { 
       Vector<Object> vector = new Vector<Object>(); 
       vector.add(line); 
       String result = vector.toString(); 


       JSONObject json = (JSONObject)new JSONParser().parse(result); 
       System.out.println("name=" + json.get("name")); 
       System.out.println("width=" + json.get("width")); 

       System.out.println(line); 
      }  


     } catch (Exception e) { 
      e.printStackTrace(); 
      Log.d(MY_APP_TAG, "Error e: " + e); 
     } 

     } 

这是拉动正确的JSON数据下降，但每一次我尝试分析我得到以下数据：

E/AndroidRuntime(923): FATAL EXCEPTION: main 
E/AndroidRuntime(923): java.lang.NoClassDefFoundError: org.json.simple.parser.JSONParser 
E/AndroidRuntime(923): at basic.authentication.BasicAuthenticationActivity.onCreate(BasicAuthenticationActivity.java:85) 
E/AndroidRuntime(923): at android.app.Activity.performCreate(Activity.java:4465) 
E/AndroidRuntime(923): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
E/AndroidRuntime(923): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
E/AndroidRuntime(923): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
E/AndroidRuntime(923): at android.app.ActivityThread.access$600(ActivityThread.java:123) 
E/AndroidRuntime(923): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
E/AndroidRuntime(923): at android.os.Handler.dispatchMessage(Handler.java:99) 
E/AndroidRuntime(923): at android.os.Looper.loop(Looper.java:137) 
E/AndroidRuntime(923): at android.app.ActivityThread.main(ActivityThread.java:4424) 
E/AndroidRuntime(923): at java.lang.reflect.Method.invokeNative(Native Method) 
E/AndroidRuntime(923): at java.lang.reflect.Method.invoke(Method.java:511) 
E/AndroidRuntime(923): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
E/AndroidRuntime(923): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
E/AndroidRuntime(923): at dalvik.system.NativeStart.main(Native Method) 

我对于JSON来说是新的，因此找出这是一个真正的巨大挑战，所以对此的任何帮助都非常感谢。

此外，JSON数据来通过这样的：

{ 
    "enabled" : true, 
    "email" : "example@gmail.com", 
    "firstName" : "example firstname", 
    "lastName" : "example lastname", 
    "name" : "example fullname", 
    "level" : { 

我知道这些都是JSON对象，而不是JSON阵列。

Answer 1

为什么你不使用你的字符串，这样创建一个JSON对象：

 JSONObject jsonObject = new JSONObject(result); 

现在，获得所需的值是这样的：

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

Answer 2

由于JVM在运行时找不到org.json.simple.parser.JSONParser，因此得到java.lang.NoClassDefFoundError。检查该库是否包含在正确的目录中并添加到你的类路径中。