1

在我的应用程序中，我正在尝试提出请求，但我收到了一个错误。这是我的代码和异常。我检查了我的代码，发现异常来自最终的 HttpResponse response = client.execute(request); 这条线。这里有什么问题。

public static String getResponse(final HttpUriRequest request, final int successCode, final boolean requiresResponse)  {
        final StringBuilder sb = new StringBuilder();

        final HttpClient client = getHttpClient();
        System.out.println("getResponce4");
        try {
            final HttpResponse response = client.execute(request);
            System.out.println("getResponce5");
            final HttpEntity entity = response.getEntity();
            System.out.println("getResponce6");


            if (entity != null) {
                final InputStream stream = entity.getContent();
                byte bytes[] = new byte[4096];
                int numBytes;
                while ((numBytes=stream.read(bytes))!=-1) {
                    if (numBytes!=0) {
                        sb.append(new String(bytes, 0, numBytes));
                    }
                }
            }

            if (response.getStatusLine().getStatusCode() != successCode) {
                closeConnection(client);
                throw new Exception(sb.toString());
            }
            System.out.println("getResponce1");
            closeConnection(client);
            System.out.println("getResponce2");
            if (!requiresResponse) return null;
            System.out.println("getResponce3");

        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        } catch (Exception e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }
        return sb.toString();
    }

    private static void closeConnection(final HttpClient client) {
        try {
            final Method closeMethod = client.getClass().getMethod("close");
            if (closeMethod != null) {
                closeMethod.invoke(client);
            }
        }
        catch (IllegalArgumentException ignored) {}
        catch (IllegalAccessException ignored) {}
        catch (InvocationTargetException ignored) {}
        catch (SecurityException ignored) {}
        catch (NoSuchMethodException ignored) {}
    }

    private static HttpClient getHttpClient() {
        Class<?> androidClientClass;
        try {
            androidClientClass = Class.forName("android.net.http.AndroidHttpClient");
            final Method method = androidClientClass.getMethod("newInstance", String.class);

            return (HttpClient) method.invoke(null, "newInstance");

        } catch (ClassNotFoundException ignored) {}
        catch (IllegalArgumentException ignored) {}
        catch (IllegalAccessException ignored) {}
        catch (InvocationTargetException ignored) {}
        catch (SecurityException ignored) {}
        catch (NoSuchMethodException ignored) {}

        return new DefaultHttpClient();
    }

    private static String notInitialized() {
        return "{ \"errorCode\" : 101 }";
    }

    public static String getAddress(final String key1, final String key2, final String lat, final String lng) throws Exception {

        final HttpGet get = new HttpGet("http://192.168.1.4:3000/api/1.0/zoappsgeo/address/lookup");

        return getResponse(get, 200, true);
    }

例外

08-01 14:44:29.272: WARN/System.err(14718): java.lang.RuntimeException: This thread forbids HTTP requests
08-01 14:44:29.272: WARN/System.err(14718): at android.net.http.AndroidHttpClient$1.process(AndroidHttpClient.java:91)
08-01 14:44:29.272: WARN/System.err(14718): at org.apache.http.protocol.BasicHttpProcessor.process(BasicHttpProcessor.java:290)
08-01 14:44:29.272: WARN/System.err(14718): at org.apache.http.protocol.HttpRequestExecutor.preProcess(HttpRequestExecutor.java:160)
08-01 14:44:29.272: WARN/System.err(14718): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:401)
08-01 14:44:29.272: WARN/System.err(14718): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
08-01 14:44:29.272: WARN/System.err(14718): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
08-01 14:44:29.272: WARN/System.err(14718): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
08-01 14:44:29.272: WARN/System.err(14718): at android.net.http.AndroidHttpClient.execute(AndroidHttpClient.java:243)
08-01 14:44:29.272: WARN/System.err(14718): at com.ZoApps.VTGClient.getResponse(VTGClient.java:59)
08-01 14:44:29.272: WARN/System.err(14718): at com.ZoApps.VTGClient.getAddress(VTGClient.java:139)
08-01 14:44:29.272: WARN/System.err(14718): at com.ZoApps.DataActivity$1.onClick(DataActivity.java:75)
08-01 14:44:29.272: WARN/System.err(14718): at android.view.View.performClick(View.java:2532)
08-01 14:44:29.272: WARN/System.err(14718): at android.view.View$PerformClick.run(View.java:9293)
08-01 14:44:29.272: WARN/System.err(14718): at android.os.Handler.handleCallback(Handler.java:587)
08-01 14:44:29.272: WARN/System.err(14718): at android.os.Handler.dispatchMessage(Handler.java:92)
08-01 14:44:29.272: WARN/System.err(14718): at android.os.Looper.loop(Looper.java:150)
08-01 14:44:29.282: WARN/System.err(14718): at android.app.ActivityThread.main(ActivityThread.java:4277)
08-01 14:44:29.282: WARN/System.err(14718): at java.lang.reflect.Method.invokeNative(Native Method)
08-01 14:44:29.282: WARN/System.err(14718): at java.lang.reflect.Method.invoke(Method.java:507)
08-01 14:44:29.282: WARN/System.err(14718): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-01 14:44:29.282: WARN/System.err(14718): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-01 14:44:29.282: WARN/System.err(14718): at dalvik.system.NativeStart.main(Native Method)
4

4 回答 4

2

DefaultHttpClient（来自 org.apache.http.impl.client 包）自 Android API 级别 1 以来一直存在。AndroidHttpClient（来自 android.net.http.AndroidHttpClient 包）仅在 Android API 级别 8 之后才可用。

然而，最重要的是 AndroidHttpClient 不允许在主（通常是 GUI）应用程序线程中执行。

更多信息请访问http://www.intertech.com/Blog/android-defaulthttpclientandroidhttpclient-and-httpparams/

于 2013-09-24T13:42:55.560 回答
1

问题是android不允许从ui线程发送请求：

AndroidHttpClient：

if (Looper.myLooper() != null && Looper.myLooper() == Looper.getMainLooper() ) {
         throw new RuntimeException("This thread forbids HTTP requests");
}

您可以在请求之前使用 DefaultHttpClient 或 AsyncTask。

还要检查：http: //loopj.com/android-async-http/ lib。

于 2013-07-09T21:32:29.753 回答
1

我也有这个问题。改变你的

androidClientClass = Class.forName("android.net.http.AndroidHttpClient");

进入

androidClientClass = Class.forName("android.net.http.DefaultHttpClient");

它已经完成了。

于 2012-08-01T11:11:56.440 回答
0

作为一种快速解决方案，将 AndroidHttpClient 替换为 DefaultHttpClient 类。虽然这不是一个好的解决方案，但应该可以。

于 2012-08-01T11:10:47.997 回答