android–java.io.IOException：收到的身份验证质询为null

概述我需要一个响应代码,但它抛出一个IOException.我不知道发生了什么事！try{url=newURL(urlBuilder.toString());conn=(HttpURLConnection)url.openConnection();conn.setDoInput(true);conn.setConnectTimeout(TIME_OUT);

我需要一个响应代码,但它抛出一个IOException.我不知道发生了什么事！

    try    {        url = new URL(urlBuilder.toString());        conn = (httpURLConnection) url.openConnection();        conn.setDoinput(true);        conn.setConnectTimeout(TIME_OUT);        conn.setRequestMethod(METHOD_GET);        conn.setRequestProperty("accept", "*/*");        conn.connect();        int responseCode = conn.getResponseCode();   //throw IOException:Received authentication challenge is null        if (responseCode == http_OK)        {            inStream = conn.getinputStream();            response = getResponse(inStream);        }        else        {            response = "response code："+responseCode;        }    } catch (Exception e)    {        throw e;    }    finally    {        conn.disconnect();    }    return response;}

IOException是：

05-03 20:14:01.577: WARN/System.err(1515): java.io.IOException: Received authentication challenge is null05-03 20:14:01.596: WARN/System.err(1515):     at org.apache.harmony.luni.internal.net.www.protocol.http.httpURLConnectionImpl.doRequestInternal(httpURLConnectionImpl.java:1694)05-03 20:14:01.577: INFO/QQWeiBo(1515): Received authentication challenge is null05-03 20:14:01.577: WARN/System.err(1515): java.io.IOException: Received authentication challenge is null05-03 20:14:01.577: WARN/System.err(1515): java.io.IOException: Received authentication challenge is null05-03 20:14:01.596: WARN/System.err(1515):     at org.apache.harmony.luni.internal.net.www.protocol.http.httpURLConnectionImpl.doRequestInternal(httpURLConnectionImpl.java:1694)05-03 20:14:01.596: WARN/System.err(1515):     at org.apache.harmony.luni.internal.net.www.protocol.http.httpURLConnectionImpl.doRequest(httpURLConnectionImpl.java:1649)05-03 20:14:01.596: WARN/System.err(1515):     at org.apache.harmony.luni.internal.net.www.protocol.http.httpURLConnectionImpl.getResponseCode(httpURLConnectionImpl.java:1374)05-03 20:14:01.596: WARN/System.err(1515):     at com.szy.weibo.service.Synchttp.httpGet(Synchttp.java:72)05-03 20:14:01.596: WARN/System.err(1515):     at com.szy.weibo.service.Weibo.getRequestToken(Weibo.java:45)05-03 20:14:01.606: WARN/System.err(1515):     at com.szy.weibo.MainActivity.startWebVIEw(MainActivity.java:95)05-03 20:14:01.606: WARN/System.err(1515):     at com.szy.weibo.MainActivity.authorization(MainActivity.java:83)05-03 20:14:01.606: WARN/System.err(1515):     at com.szy.weibo.MainActivity.onClick(MainActivity.java:71)05-03 20:14:01.606: WARN/System.err(1515):     at androID.vIEw.VIEw.performClick(VIEw.java:2408)05-03 20:14:01.596: WARN/System.err(1515):     at org.apache.harmony.luni.internal.net.www.protocol.http.httpURLConnectionImpl.doRequestInternal(httpURLConnectionImpl.java:1694)05-03 20:14:01.596: WARN/System.err(1515):     at org.apache.harmony.luni.internal.net.www.protocol.http.httpURLConnectionImpl.doRequest(httpURLConnectionImpl.java:1649)05-03 20:14:01.596: WARN/System.err(1515):     at org.apache.harmony.luni.internal.net.www.protocol.http.httpURLConnectionImpl.getResponseCode(httpURLConnectionImpl.java:1374)05-03 20:14:01.596: WARN/System.err(1515):     at com.szy.weibo.service.Synchttp.httpGet(Synchttp.java:72)05-03 20:14:01.596: WARN/System.err(1515):     at com.szy.weibo.service.Weibo.getRequestToken(Weibo.java:45)05-03 20:14:01.606: WARN/System.err(1515):     at com.szy.weibo.MainActivity.startWebVIEw(MainActivity.java:95)05-03 20:14:01.606: WARN/System.err(1515):     at com.szy.weibo.MainActivity.authorization(MainActivity.java:83)05-03 20:14:01.606: WARN/System.err(1515):     at com.szy.weibo.MainActivity.onClick(MainActivity.java:71)05-03 20:14:01.606: WARN/System.err(1515):     at androID.vIEw.VIEw.performClick(VIEw.java:2408)05-03 20:14:01.596: WARN/System.err(1515):     at org.apache.harmony.luni.internal.net.www.protocol.http.httpURLConnectionImpl.doRequest(httpURLConnectionImpl.java:1649)05-03 20:14:01.596: WARN/System.err(1515):     at org.apache.harmony.luni.internal.net.www.protocol.http.httpURLConnectionImpl.getResponseCode(httpURLConnectionImpl.java:1374)05-03 20:14:01.596: WARN/System.err(1515):     at com.szy.weibo.service.Synchttp.httpGet(Synchttp.java:72)05-03 20:14:01.596: WARN/System.err(1515):     at com.szy.weibo.service.Weibo.getRequestToken(Weibo.java:45)05-03 20:14:01.606: WARN/System.err(1515):     at com.szy.weibo.MainActivity.startWebVIEw(MainActivity.java:95)05-03 20:14:01.606: WARN/System.err(1515):     at com.szy.weibo.MainActivity.authorization(MainActivity.java:83)05-03 20:14:01.606: WARN/System.err(1515):     at com.szy.weibo.MainActivity.onClick(MainActivity.java:71)05-03 20:14:01.606: WARN/System.err(1515):     at androID.vIEw.VIEw.performClick(VIEw.java:2408)05-03 20:14:01.606: WARN/System.err(1515):     at androID.vIEw.VIEw$PerformClick.run(VIEw.java:8816)05-03 20:14:01.616: WARN/System.err(1515):     at androID.os.Handler.handleCallback(Handler.java:587)05-03 20:14:01.627: WARN/System.err(1515):     at androID.os.Handler.dispatchMessage(Handler.java:92)05-03 20:14:01.627: WARN/System.err(1515):     at androID.os.Looper.loop(Looper.java:123)05-03 20:14:01.627: WARN/System.err(1515):     at androID.app.ActivityThread.main(ActivityThread.java:4627)05-03 20:14:01.627: WARN/System.err(1515):     at java.lang.reflect.Method.invokeNative(Native Method)05-03 20:14:01.606: WARN/System.err(1515):     at androID.vIEw.VIEw$PerformClick.run(VIEw.java:8816)05-03 20:14:01.616: WARN/System.err(1515):     at androID.os.Handler.handleCallback(Handler.java:587)05-03 20:14:01.627: WARN/System.err(1515):     at androID.os.Handler.dispatchMessage(Handler.java:92)05-03 20:14:01.627: WARN/System.err(1515):     at androID.os.Looper.loop(Looper.java:123)05-03 20:14:01.627: WARN/System.err(1515):     at androID.app.ActivityThread.main(ActivityThread.java:4627)05-03 20:14:01.627: WARN/System.err(1515):     at java.lang.reflect.Method.invokeNative(Native Method)05-03 20:14:01.627: WARN/System.err(1515):     at java.lang.reflect.Method.invoke(Method.java:521)05-03 20:14:01.647: WARN/System.err(1515):     at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)05-03 20:14:01.647: WARN/System.err(1515):     at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:626)05-03 20:14:01.647: WARN/System.err(1515):     at dalvik.system.NativeStart.main(Native Method)05-03 20:14:01.606: WARN/System.err(1515):     at androID.vIEw.VIEw$PerformClick.run(VIEw.java:8816)05-03 20:14:01.616: WARN/System.err(1515):     at androID.os.Handler.handleCallback(Handler.java:587)05-03 20:14:01.627: WARN/System.err(1515):     at androID.os.Handler.dispatchMessage(Handler.java:92)05-03 20:14:01.627: WARN/System.err(1515):     at androID.os.Looper.loop(Looper.java:123)05-03 20:14:01.627: WARN/System.err(1515):     at androID.app.ActivityThread.main(ActivityThread.java:4627)05-03 20:14:01.627: WARN/System.err(1515):     at java.lang.reflect.Method.invokeNative(Native Method)05-03 20:14:01.627: WARN/System.err(1515):     at java.lang.reflect.Method.invoke(Method.java:521)05-03 20:14:01.647: WARN/System.err(1515):     at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)05-03 20:14:01.647: WARN/System.err(1515):     at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:626)05-03 20:14:01.647: WARN/System.err(1515):     at dalvik.system.NativeStart.main(Native Method)05-03 20:14:01.627: WARN/System.err(1515):     at java.lang.reflect.Method.invoke(Method.java:521)05-03 20:14:01.647: WARN/System.err(1515):     at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)05-03 20:14:01.647: WARN/System.err(1515):     at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:626)05-03 20:14:01.647: WARN/System.err(1515):     at dalvik.system.NativeStart.main(Native Method)

解决方法:

通常,您可以通过第二次在连接上调用.getResponseCode()来获取响应代码.起初这对我来说很困惑,但如果你读了httpURLConnectionImpl足够多次,你的眼睛会止血并看到真相……

如果以这种方式修改代码,您将获得响应代码：

try    {        url = new URL(urlBuilder.toString());        conn = (httpURLConnection) url.openConnection();        conn.setDoinput(true);        conn.setConnectTimeout(TIME_OUT);        conn.setRequestMethod(METHOD_GET);        conn.setRequestProperty("accept", "*/*");        conn.connect();        int responseCode = conn.getResponseCode();   //throw IOException:Received authentication challenge is null        if (responseCode == http_OK)        {            inStream = conn.getinputStream();            response = getResponse(inStream);        }        else        {            response = "response code："+responseCode;        }    } catch (Exception e)    {        // Here you can get the correct response code        if (conn != null) {            int responseCodeAfterException = conn.getResponseCode();            // Handle according to new response code        }        // Maybe don't throw e if 401?        throw e;    }    finally    {        conn.disconnect();    }    return response;}

请参阅responseCodeAfterException.

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