Java Android JSON解析“；JSONException；价值<；！DOCTYPE

我正在尝试使用下面的代码来解析JSON数据，该网站需要一个API密钥，它现在作为字符串存储在my strings.xml中

public class JSONParser {

static InputStream is = null;
static JSONArray jarray = null;
static String json = "";

// constructor
public JSONParser() {
}

public JSONArray getJSONFromUrl(String url) {
    // Making HTTP request
    try {
        // defaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();           

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

    try {

        JSONObject jObj = new JSONObject(json);
        jarray = jObj.getJSONArray("systems");
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    return jarray;
}
}

主要活动

 public class MainActivity extends ListActivity {
private Context context;
private static String url = "https://api.company.com/api/systems";

private static final String TAG_SYSTEM = "systems";
private static final String TAG_SYSTEM_ID = "system_id";

ArrayList<HashMap<String, String>> jsonlist = new ArrayList<HashMap<String, String>>();

ListView lv ;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    new ProgressTask(MainActivity.this).execute();
}
private class ProgressTask extends AsyncTask<String, Void, Boolean> {
    private ProgressDialog dialog;

    private ListActivity activity;

    // private List<Message> messages;
    public ProgressTask(ListActivity activity) {
        this.activity = activity;
        context = activity;
        dialog = new ProgressDialog(context);
    }

    /** progress dialog to show user that the backup is processing. */
    private Context context;

    protected void onPreExecute() {
        this.dialog.setMessage("Progress start");
        this.dialog.show();
    }

    @Override
    protected void onPostExecute(final Boolean success) {
        if (dialog.isShowing()) {
            dialog.dismiss();
        }
        ListAdapter adapter = new SimpleAdapter(context, jsonlist,          
        R.layout.list_item, new String[] { TAG_SYSTEM, TAG_SYSTEM_ID
                 }, new int[] {
                R.id.vehicleType, R.id.vehicleColor });

        setListAdapter(adapter);
        // selecting single ListView item
         lv = getListView();
    }
    protected Boolean doInBackground(final String... args) {

        JSONParser jParser = new JSONParser();
        //Using APIKEY from strings.xml
        String apikey = getString(R.string.apikey);
        // getting JSON string from URL
        JSONArray json = jParser.getJSONFromUrl(url + "&key=" + apikey);

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

            try {
                JSONObject c = json.getJSONObject(i);

                String vcolor = c.getString(TAG_SYSTEM_ID);

                HashMap<String, String> map = new HashMap<String, String>();

                // adding each child node to HashMap key => value
                map.put(TAG_SYSTEM_ID, vcolor);
                jsonlist.add(map);
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return null;
    }
}

public类MainActivity扩展了ListActivity{
私人语境；
专用静态字符串url=”https://api.company.com/api/systems";
私有静态最终字符串TAG_SYSTEM=“systems”；
私有静态最终字符串TAG\u SYSTEM\u ID=“SYSTEM\u ID”；
ArrayList jsonlist=新的ArrayList（）；
ListView lv；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
新建ProgressTask（MainActivity.this）.execute（）；
}
私有类ProgressTask扩展了AsyncTask{
私人对话；
私人上市活动；
//私人列表消息；
公共进程任务（列表活动）{
这个。活动=活动；
上下文=活动；
dialog=新建进度对话框（上下文）；
}
/**“进度”对话框，向用户显示备份正在处理*/
私人语境；
受保护的void onPreExecute（）{
this.dialog.setMessage（“进度开始”）；
this.dialog.show（）；
}
@凌驾
受保护的void onPostExecute（最终布尔值成功）{
if（dialog.isShowing（））{
dialog.dismise（）；
}
ListAdapter=new SimpleAdapter（上下文，jsonlist，
R.layout.list_项，新字符串[]{TAG_SYSTEM，TAG_SYSTEM_ID
}，new int[]{
R.id.vehicleType，R.id.vehicleColor}）；
setListAdapter（适配器）；
//选择单个ListView项
lv=getListView（）；
}
受保护的布尔doInBackground（最终字符串…args）{
JSONParser jParser=新的JSONParser（）；
//使用strings.xml中的APIKEY
String apikey=getString（R.String.apikey）；
//从URL获取JSON字符串
JSONArray json=jParser.getJSONFromUrl（url+“&key=“+apikey”）；
for（int i=0；ivalue
地图放置（标签系统ID，vcolor）；
jsonlist.add（map）；
}捕获（JSONException e）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
}
返回null；
}
}

}

这是我目前的日志

  04-30 15:39:53.775: E/JSON Parser(9814): Error parsing data org.json.JSONException: Value   <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
04-30 15:39:53.780: E/AndroidRuntime(9814): FATAL EXCEPTION: AsyncTask #1
04-30 15:39:53.780: E/AndroidRuntime(9814): java.lang.RuntimeException: An error occured while executing doInBackground()
04-30 15:39:53.780: E/AndroidRuntime(9814):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at java.lang.Thread.run(Thread.java:856)
04-30 15:39:53.780: E/AndroidRuntime(9814): Caused by: java.lang.NullPointerException
04-30 15:39:53.780: E/AndroidRuntime(9814):     at com.jitesh.androidjsonparser.MainActivity$ProgressTask.doInBackground(MainActivity.java:102)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at com.jitesh.androidjsonparser.MainActivity$ProgressTask.doInBackground(MainActivity.java:1)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
04-30 15:39:53.780: E/AndroidRuntime(9814):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
04-30 15:39:53.780: E/AndroidRuntime(9814):     ... 5 more
04-30 15:40:03.035: E/WindowManager(9814): Activity com.jitesh.androidjsonparser.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4257ae80 that was originally added here
04-30 15:40:03.035: E/WindowManager(9814): android.view.WindowLeaked: Activity com.jitesh.androidjsonparser.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4257ae80 that was originally added here
04-30 15:40:03.035: E/WindowManager(9814):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:402)
04-30 15:40:03.035: E/WindowManager(9814):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:311)
04-30 15:40:03.035: E/WindowManager(9814):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224)
04-30 15:40:03.035: E/WindowManager(9814):  at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:149)
04-30 15:40:03.035: E/WindowManager(9814):  at android.view.Window$LocalWindowManager.addView(Window.java:554)
04-30 15:40:03.035: E/WindowManager(9814):  at android.app.Dialog.show(Dialog.java:277)
04-30 15:40:03.035: E/WindowManager(9814):  at com.jitesh.androidjsonparser.MainActivity$ProgressTask.onPreExecute(MainActivity.java:69)
04-30 15:40:03.035: E/WindowManager(9814):  at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
04-30 15:40:03.035: E/WindowManager(9814):  at android.os.AsyncTask.execute(AsyncTask.java:534)
04-30 15:40:03.035: E/WindowManager(9814):  at com.jitesh.androidjsonparser.MainActivity.onCreate(MainActivity.java:47)
04-30 15:40:03.035: E/WindowManager(9814):  at android.app.Activity.performCreate(Activity.java:5206)
04-30 15:40:03.035: E/WindowManager(9814):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
04-30 15:40:03.035: E/WindowManager(9814):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
04-30 15:40:03.035: E/WindowManager(9814):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
04-30 15:40:03.035: E/WindowManager(9814):  at android.app.ActivityThread.access$600(ActivityThread.java:140)
04-30 15:40:03.035: E/WindowManager(9814):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
04-30 15:40:03.035: E/WindowManager(9814):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-30 15:40:03.035: E/WindowManager(9814):  at android.os.Looper.loop(Looper.java:137)
04-30 15:40:03.035: E/WindowManager(9814):  at android.app.ActivityThread.main(ActivityThread.java:4898)
04-30 15:40:03.035: E/WindowManager(9814):  at java.lang.reflect.Method.invokeNative(Native Method)
04-30 15:40:03.035: E/WindowManager(9814):  at java.lang.reflect.Method.invoke(Method.java:511)
04-30 15:40:03.035: E/WindowManager(9814):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
04-30 15:40:03.035: E/WindowManager(9814):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
04-30 15:40:03.035: E/WindowManager(9814):  at dalvik.system.NativeStart.main(Native Method)

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04-30 15:39:53.775:E/JSON解析器（9814）：错误解析数据org.JSON.JSONException:Value该服务显然返回服务器错误。尝试从可以看到响应的客户端使用相同的参数调用服务，或者在尝试将字符串响应解析为JSON之前记录字符串响应。确切的服务器响应肯定会告诉您查询出了什么问题。
这是来自您的服务器的错误。您要检查状态代码吗
通过调用httpResponse.getStatusLine（）.getStatusCode（）

如果状态代码为200，则可以开始解析结果。否则，这是一个错误，您必须优雅地处理该错误。
您能用json响应更新您的问题吗？@SankarV您指的是我试图解析的实际json数据吗。如果是，则该API所属公司的API文档