HttpUrlConnection正在冻结我的AsyncTask [英] HttpUrlConnection is freezing my AsyncTask
问题描述
在AsyncTask的doInBackground函数中,我得到了以下代码:
In the "doInBackground" function of a AsyncTask, I got the following piece of code :
try
{
URL url = new URL(myUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("POST");
conn.setDoInput(true);
Authenticator.setDefault(new Authenticator(){
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication ("myUsername", "myPassword".toCharArray());
}
});
conn.connect();
int response = conn.getResponseCode();
inputStream = conn.getInputStream();
String content = convertInputStreamToString(inputStream);
return content;
catch (Exception e) {
e.printStackTrace();
return null;
}
当凭据正常时,一切正常,ResponseCode为200.但是如果我输入了错误的凭据,getResponseCode()会使AsyncTask无限期地等待答案(超时将无效)。查看HttpUrlConnection对象告诉我ResponseCode为-1。
When the credentials are ok, everything works fine and the ResponseCode is 200. But if I put the wrong credentials, getResponseCode() makes the AsyncTask wait for an answer indefinitely (timeout won't work). Looking at HttpUrlConnection object tells me that the ResponseCode is -1.
我需要处理所有情况,即使用户提供了错误的凭据。我怎样才能获得有用的答案?我应该使用除HttpUrlConnection之外的其他类吗?
I need to handle every situation, even if the user provides a bad credential. How can I get an usable answer? Should I use another class than HttpUrlConnection?
推荐答案
您是否正在返回字符串
从这个函数回来,你在处理异常吗?你写过 onPostExecute
吗?
Are you returning String
back from this function and are you handling exceptions? Did you write onPostExecute
?
以下是适合我的代码:
URL url = new URL(strUrl);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Host", "myhost.com");
conn.setRequestProperty("Authorization", "Basic " + Base64.encodeToString(toencode, Base64.DEFAULT));
conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Macintosh; U; PPC; en-US; rv:1.3.1)");
conn.setRequestProperty("Accept-Charset", "UTF-8");
conn.setConnectTimeout (5000) ;
conn.setDoOutput(true);
conn.setDoInput(true);
BufferedInputStream in = new BufferedInputStream(conn.getInputStream());
result = Utilities.readStream(in);
status_code = conn.getResponseCode();
return result;
} catch (MalformedURLException e) {
return e.getMessage();
} catch (ProtocolException e) {
try {
status_code = conn.getResponseCode();
} catch (IOException e1) {
status_code = -1;
}
return e.getMessage();
} catch (IOException e) {
try {
status_code = conn.getResponseCode();
} catch (IOException e1) {
status_code = -1;
}
return e.getMessage();
} catch ( Exception e ) {
try {
status_code = conn.getResponseCode();
} catch (IOException e1) {
status_code = -1;
}
return e.getMessage();
}
finally
{
conn = null;
}
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