Android Http request 报 IOExcepiton

Question

本人在做Android项目时，遇到如下问题：httpResponse = client.execute(request, context); 在该句代码执行时总是报 IOException，并不是左右的网站请求都报这个错误，我已在AndroidMainfest.xml中添加如下代码：<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />请教高人，这是什么原因呢？

Answer 1

把logcat里IOException的详细信息都贴出来

Answer 2

  private String doRequest(HttpRequestBase request) throws ConnectionException, FailException  {
    String result = null;
    HttpResponse httpResponse = null;
    if (null == client)
      client = (DefaultHttpClient) getHttpsClient();
    try {
      HttpContext context = null;
      if (null != ClearvaleClient.cookieStore) {
        context = new BasicHttpContext();
        context.setAttribute(ClientContext.COOKIE_STORE,
            ClearvaleClient.cookieStore);
      }      httpResponse = client.execute(request, context);
      int status = httpResponse.getStatusLine().getStatusCode();
      if (status == HttpStatus.SC_OK) {
        result = EntityUtils.toString(httpResponse.getEntity());
      } else {
        throw new FailException(status);
      }
    }
    catch (HttpHostConnectException hce) {
System.out.println("HttpHostConnectException");
      throw new ConnectionException(hce);
    }
    catch (ClientProtocolException e1) {
System.out.println("ClientProtocolException");
      throw new ConnectionException(e1);
    }
    catch (IOException e1) {
System.out.println("IOException");
      throw new ConnectionException(e1);
    }
    return result;
  }以上是发送请求的详细代码，其中参数是这样传递的: HttpGet httpRequest = new HttpGet(finalURL); finalURL 为一个url请求地址，比如: finalURL: https://muran.cvtest.com/pg/cvapi/rest/json?auth_token=dec66c321786a26bb4567627d879e95e&limit=20&lang=zh

Answer 3

其实你这个IOException有可能是SocketTimeoutException
你在catch IOException之前，
catch(SocketTimeoutException e){
System.out.println("SocketTimeoutException");       
        throw new ConnectionException(hce); 
}
试试

Answer 4

@cclovescw: 不好意思，昨天有个别的项目比较急！我今天试了一下，没有catch到SocketTimeoutException呢！还是报IOException呢catch (HttpHostConnectException hce) {
System.out.println("HttpHostConnectException");
      throw new ConnectionException(hce);
    }
    catch (ClientProtocolException e1) {
System.out.println("ClientProtocolException");
      throw new ConnectionException(e1);
    }
    catch(SocketTimeoutException e){
System.out.println("SocketTimeoutException");       
      throw new ConnectionException(e);   
    }
    catch (IOException e1) {
System.out.println("IOException");
      throw new ConnectionException(e1);
    }

Answer 5

关键你要看看logcat里的日志，把exception打出来

Answer 6

catch (IOException e1) {
System.out.println("IOException");
//      throw new ConnectionException(e1);
      e1.printStackTrace();
    }打印IOException信息，如下：06-04 14:34:00.827: W/System.err(7036): java.net.UnknownHostException: muraneco.cvtest.com
06-04 14:34:00.827: W/System.err(7036):  at java.net.InetAddress.lookupHostByName(InetAddress.java:513)
06-04 14:34:00.834: W/System.err(7036):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:278)
06-04 14:34:00.834: W/System.err(7036):  at java.net.InetAddress.getAllByName(InetAddress.java:242)
06-04 14:34:00.834: W/System.err(7036):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:140)
06-04 14:34:00.834: W/System.err(7036):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
06-04 14:34:00.834: W/System.err(7036):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
06-04 14:34:00.842: W/System.err(7036):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:352)
06-04 14:34:00.842: W/System.err(7036):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
06-04 14:34:00.850: W/System.err(7036):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
06-04 14:34:00.850: W/System.err(7036):  at com.broadvision.clearvale.http.client.ClearvaleClient.doRequest(ClearvaleClient.java:225)
06-04 14:34:00.850: W/System.err(7036):  at com.broadvision.clearvale.http.client.ClearvaleClient.doGet(ClearvaleClient.java:186)
06-04 14:34:00.858: W/System.err(7036):  at com.broadvision.clearvale.service.CommunityDAO.getCommunitiesForUser(CommunityDAO.java:94)
06-04 14:34:00.858: W/System.err(7036):  at com.broadvision.clearvale.activities.communities.CommunitiesListActivity.getCommunities(CommunitiesListActivity.java:139)
06-04 14:34:00.858: W/System.err(7036):  at com.broadvision.clearvale.activities.communities.CommunitiesListActivity.access$12(CommunitiesListActivity.java:138)
06-04 14:34:00.858: W/System.err(7036):  at com.broadvision.clearvale.activities.communities.CommunitiesListActivity$2.run(CommunitiesListActivity.java:110)这是打印出来的log信息，奇怪的是，我访问的是 muraneco01.cvtest.com, 现在却报： java.net.UnknownHostException: muraneco.cvtest.com，请求指向：muraneco.cvtest.com神马原因呢？！

Answer 7

神人啊，，你加个访问网络的权限先，，，android。xxx,Intenet，，，然后这个放在Thread就不会了，，神人

Answer 8

Android_app: 访问网络的权限已经加上了，开始帖子中就提到了。

Answer 9

    <uses-permission android:name="android.permission.INTERNET"/>

Answer 10

1   <uses-permission android:name="android.permission.INTERNET"/>
2  如果在主线中 需要StrictMode.enableDefaults();
或者把你的代码移动其它非主线程中去