我正在创建一个从 Web 服务获取 Json 响应的应用程序。该应用程序位于 2 个文件中，一个 webclient 和一个 webserviceActivity。客户端回来了，我认为 logcat 正在打印 HTTP/1.1 200 OK。之后似乎有一个 JSONException。它可能与 url 中传递的第二个参数的格式有关，因为它是一个日期。我尝试传入一个字符串，但无济于事。我在这里完成的方法是从 sql.Date(yyyy mm dd) 创建一个日期对象并将其传递进去。这样我在 JSONException 之前从服务器得到了一点回报
这是文件。提前致谢。
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.ContentValues;
import android.util.Log;
public class WebClient {
private static final String TAG = WebClient.class.getSimpleName();
private static String convertStreamToString(InputStream is) {
/*
* To convert the InputStream to String we use the
* BufferedReader.readLine() method. We iterate until the BufferedReader
* return null which means there's no more data to read. Each line will
* appended to a StringBuilder and returned as String.
*/
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
/*
* This is a test function which will connects to a given rest service and
* prints it's response to Android Log with labels "Praeda".
*/
public JSONObject connect(String url) {
JSONObject json = null;
HttpClient httpclient = new DefaultHttpClient();
// Prepare a request object
HttpGet httpget = new HttpGet(url);
// Execute the request
HttpResponse response;
try {
response = httpclient.execute(httpget);
// Examine the response status
Log.i(TAG, response.getStatusLine().toString());
// Get hold of the response entity
HttpEntity entity = response.getEntity();
// If the response does not enclose an entity, there is no need
// to worry about connection release
if (entity != null) {
// A Simple JSON Response Read
InputStream instream = entity.getContent();
String result = convertStreamToString(instream);
Log.i(TAG, result);
// A Simple JSONObject Creation
json = new JSONObject(result);
// Closing the input stream will trigger connection release
instream.close();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return json;
}
}
.
import java.sql.Date;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
public class WebserviceActivity extends Activity {
private static final String TAG = WebserviceActivity.class.getSimpleName();
TextView tv = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.textviewwebserviceresponse);
WebClient rc = new WebClient();
@SuppressWarnings("deprecation")
Date d = new Date(2012, 9, 3);
JSONObject jObj = rc
.connect("http://212.169.27.217:84/rotaservice.asmx/GetRota?CarerID=36&RotaDate="+d);
Log.e(TAG, "json obj = " + jObj.toString());
tv.setText(jObj.toString());
}// end of onCreate
}// end of class
.
09-03 19:52:00.490: I/global(21931): In close() at SocketHttpClientConnection
09-03 19:52:00.490: I/global(21931): call createSocket() return a new socket.
09-03 19:52:03.610: I/WebClient(21931): HTTP/1.1 200 OK
09-03 19:52:03.610: I/WebClient(21931): <?xml version="1.0" encoding="utf-8"?>
09-03 19:52:03.610: I/WebClient(21931): <string xmlns="http://tempuri.org/">{"0":{"StartDate":"","EndDate":"","Duration":"0","CallStatusID":"0","CallStatusName":"","ClientSurname":"","ClientForename":"","NeedName":"Out of range","CarerAwayReason":"","CallID":"","DoubleUpCallID":""}}</string>
09-03 19:52:03.620: W/System.err(21931): org.json.JSONException: Value <?xml of type java.lang.String cannot be converted to JSONObject
09-03 19:52:03.620: W/System.err(21931): at org.json.JSON.typeMismatch(JSON.java:111)
09-03 19:52:03.620: W/System.err(21931): at org.json.JSONObject.<init>(JSONObject.java:158)
09-03 19:52:03.620: W/System.err(21931): at org.json.JSONObject.<init>(JSONObject.java:171)
09-03 19:52:03.620: W/System.err(21931): at com.carefreegroup.WebClient.connect(WebClient.java:87)
09-03 19:52:03.620: W/System.err(21931): at com.carefreegroup.WebserviceActivity.onCreate(WebserviceActivity.java:31)
09-03 19:52:03.620: W/System.err(21931): at android.app.Activity.performCreate(Activity.java:4543)
09-03 19:52:03.620: W/System.err(21931): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071)
09-03 19:52:03.620: W/System.err(21931): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2181)
09-03 19:52:03.620: W/System.err(21931): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2260)
09-03 19:52:03.620: W/System.err(21931): at android.app.ActivityThread.access$600(ActivityThread.java:139)
09-03 19:52:03.620: W/System.err(21931): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1277)
09-03 19:52:03.620: W/System.err(21931): at android.os.Handler.dispatchMessage(Handler.java:99)
09-03 19:52:03.620: W/System.err(21931): at android.os.Looper.loop(Looper.java:156)
09-03 19:52:03.620: W/System.err(21931): at android.app.ActivityThread.main(ActivityThread.java:5045)
09-03 19:52:03.620: W/System.err(21931): at java.lang.reflect.Method.invokeNative(Native Method)
09-03 19:52:03.630: W/System.err(21931): at java.lang.reflect.Method.invoke(Method.java:511)
09-03 19:52:03.630: W/System.err(21931): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-03 19:52:03.630: W/System.err(21931): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-03 19:52:03.630: W/System.err(21931): at dalvik.system.NativeStart.main(Native Method)
09-03 19:52:03.630: D/AndroidRuntime(21931): Shutting down VM