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Android上的Http连接超时无法正常工作

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我正在编写一个连接到Web服务的应用程序，如果它无法 Build 连接，我不希望它等待太久 . 因此，我设置了httpparams的connectionTimeout . 但它似乎没有任何影响 .

测试我暂时关闭我的WLAN . 应用程序尝试连接相当长的时间（超过我想要的3秒），然后抛出UnknownHostException .

这是我的代码：

try{
    HttpClient httpclient = new DefaultHttpClient();
    HttpParams params = httpclient.getParams();
    HttpConnectionParams.setConnectionTimeout(params, 3000);
    HttpConnectionParams.setSoTimeout(params, 3000);

    httppost = new HttpPost(URL);
    StringEntity se = new StringEntity(envelope,HTTP.UTF_8);
    httppost.setEntity(se);
    //Code stops here until UnknownHostException is thrown.
    BasicHttpResponse httpResponse = (BasicHttpResponse) httpclient.execute(httppost);

    HttpEntity entity = httpResponse.getEntity();
    return entity;

}catch (Exception e){
    e.printStackTrace();
}

任何人都有我想念的想法吗？

android http post timeout

5 回答

  • 3

    尝试这样做：

    HttpPost httpPost = new HttpPost(url);
StringEntity se = new StringEntity(envelope,HTTP.UTF_8);
httpPost.setEntity(se);

HttpParams httpParameters = new BasicHttpParams();
// Set the timeout in milliseconds until a connection is established.
int timeoutConnection = 3000;
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
// Set the default socket timeout (SO_TIMEOUT) 
// in milliseconds which is the timeout for waiting for data.
int timeoutSocket = 3000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);

DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
BasicHttpResponse httpResponse = (BasicHttpResponse)  httpClient.execute(httpPost);

HttpEntity entity = httpResponse.getEntity();
return entity;

    然后你可以 grab 一个可能ConnectTimeoutException .

    回复于
  • 1

    使用标记的解决方案，我仍然在30秒后收到UnknownHostException . 在这种情况下，设备连接到wifi路由器，但没有互联网访问 .

    采取的方法是启动一个只会尝试解析主机名的AsyncTask . 阻塞调用每250毫秒检查一次是否成功，4秒后它将取消该任务并返回 .

    这就是我解决它的方法：

    private boolean dnsOkay = false;
private static final int DNS_SLEEP_WAIT = 250;
private synchronized boolean resolveDns(){

    RemoteDnsCheck check = new RemoteDnsCheck();
    check.execute();
    try {
        int timeSlept = 0;
        while(!dnsOkay && timeSlept<4000){
            //Log.d("RemoteDnsCheck", "sleeping");
            Thread.sleep(DNS_SLEEP_WAIT);
            timeSlept+=DNS_SLEEP_WAIT;
            //Log.d("RemoteDnsCheck", "slept");
        }
    } catch (InterruptedException e) {

    }

    if(!dnsOkay){
        Log.d("resolveDns", "cancelling");
        check.cancel(true);
        Log.d("resolveDns", "cancelled");
    }
    return dnsOkay;
}

private class RemoteDnsCheck extends AsyncTask<Void, Void, Void>{

    @Override
    protected Void doInBackground(Void... params) {
        try {
            Log.d("RemoteDnsCheck", "starting");
            dnsOkay = false;
            InetAddress addr = InetAddress.getByName(baseServiceURL);
            if(addr!=null){
                Log.d("RemoteDnsCheck", "got addr");
                dnsOkay = true;
            }
        } catch (UnknownHostException e) {
            Log.d("RemoteDnsCheck", "UnknownHostException");
        }
        return null;
    }

}

    然后，每当我想要进行Web调用时，都会在函数开头调用它：

    if(!resolveDns()){
        return null;
    }
    回复于
  • 0

    见：https://stackoverflow.com/a/20031077/2609238

    问题可能出在Apache HTTP Client中 . 请参阅HTTPCLIENT-1098 . 在4.1.2中修复 .

    超时异常尝试将DNS反转为IP，以进行日志记录 . 这需要额外的时间，直到实际触发异常 .

    回复于
  • 74

    这个方法适合我：

    AndroidHttpTransport androidHttpTransport = new AndroidHttpTransport( endpoint, 3000) ;
    回复于
  • 9
    HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
// Set the default socket timeout (SO_TIMEOUT)
    回复于

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