我正在编写一个连接到受密码保护的cPanel服务器(Apache 2.2.22)页面的Android应用程序。当身份验证凭据正确时,我没有连接问题。但是,当凭据不正确时,我的Android应用程序似乎冻结在HttpURLConnection.getResponseCode()
方法中。服务器上的日志显示从我的Android设备发送的数百个请求,所有请求都按预期返回401,但由于某种原因,这不会反映在我的应用程序中。
这是我的代码,在AsyncTask中执行:
@Override
protected Integer doInBackground(String... bookInfoString) {
// Stop if cancelled
if(isCancelled()){
return null;
}
Log.i(getClass().getName(), "SendToDatabase.doInBackground()");
String apiUrlString = getResources().getString(R.string.url_vages_library);
try{
NetworkConnection connection = new NetworkConnection(apiUrlString);
connection.appendPostData(bookInfoString[0]);
int responseCode = connection.getResponseCode();
Log.d(getClass().getName(), "responseCode: " + responseCode);
return responseCode;
} catch(IOException e) {
return null;
}
}
此代码使用我自己的类NetworkConnection
,它只是一个围绕HttpURLConnection的基本包装类,以避免重复代码。这是:
public class NetworkConnection {
private String url;
private HttpURLConnection connection;
public NetworkConnection(String urlString) throws IOException{
Log.i(getClass().getName(), "Building NetworkConnection for the URL \"" + urlString + "\"");
url = urlString;
// Build Connection.
try{
URL url = new URL(urlString);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setReadTimeout(1000 /* 1 seconds */);
connection.setConnectTimeout(1000 /* 1 seconds */);
} catch (MalformedURLException e) {
// Impossible: The only two URLs used in the app are taken from string resources.
e.printStackTrace();
} catch (ProtocolException e) {
// Impossible: "GET" is a perfectly valid request method.
e.printStackTrace();
}
}
public void appendPostData(String postData) {
try{
Log.d(getClass().getName(), "appendPostData() called.\n" + postData);
Log.d(getClass().getName(), "connection.getConnectTimeout(): " + connection.getConnectTimeout());
Log.d(getClass().getName(), "connection.getReadTimeout(): " + connection.getReadTimeout());
// Modify connection settings.
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "application/json");
// Get OutputStream and attach POST data.
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream(), "UTF-8");
writer.write(postData);
if(writer != null){
writer.flush();
writer.close();
}
} catch (SocketTimeoutException e) {
Log.w(getClass().getName(), "Connection timed out.");
} catch (ProtocolException e) {
// Impossible: "POST" is a perfectly valid request method.
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// Impossible: "UTF-8" is a perfectly valid encoding.
e.printStackTrace();
} catch (IOException e) {
// Pretty sure this is impossible but not 100%.
e.printStackTrace();
}
}
public int getResponseCode() throws IOException{
Log.i(getClass().getName(), "getResponseCode()");
int responseCode = connection.getResponseCode();
Log.i(getClass().getName(), "responseCode: " + responseCode);
return responseCode;
}
public void disconnect(){
Log.i(getClass().getName(), "disconnect()");
connection.disconnect();
}
}
最后,这里只是logcat日志的一小部分:
05-03 11:01:16.315: D/vages.library.NetworkConnection(3408): connection.getConnectTimeout(): 1000
05-03 11:01:16.315: D/vages.library.NetworkConnection(3408): connection.getReadTimeout(): 1000
05-03 11:01:16.585: I/vages.library.NetworkConnection(3408): getResponseCode()
05-03 11:04:06.395: I/vages.library.MainActivity$SendToDatabase(3408): SendToDatabase.onPostExecute(null)
您可以看到该方法似乎只是在一段随机时间后返回null。我等待的最长时间恰好是15分钟。 dalikvm还有几个我省略的最后两个信息日志之间的内存日志(GC_CONCURRENT)。
我还应该说,目前我没有使用https,虽然我不认为这会导致任何问题。我非常感谢任何有关此的反馈,无论是完整答案还是只是评论告诉我不是问题,因为我仍然不确定这个问题是服务器端还是客户端侧的。
非常感谢, 威廉
编辑:我之前忘记提及,我正在使用自己的自定义java.net.Authenticator
附加我的身份验证凭据:
public class CustomAuthenticator extends Authenticator {
Context mContext;
public CustomAuthenticator(Context context){
super();
mContext = context;
}
@Override
protected PasswordAuthentication getPasswordAuthentication() {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(mContext);
String username = sharedPreferences.getString(SettingsActivity.KEY_USERNAME_PREFERENCE, null);
String password = sharedPreferences.getString(SettingsActivity.KEY_PASSWORD_PREFERENCE, null);
return new PasswordAuthentication(username, password.toCharArray());
}
}
我在活动的onCreate()
方法中设置:
Authenticator.setDefault(new CustomAuthenticator(mContext));
另外,我使用curl来请求受密码保护的资源,并按预期收到了401。我现在假设问题是客户端。
答案 0 :(得分:3)
在POST连接中使用Authenticator似乎是issue。它已经很老了所以我不知道它是否仍然存在。
我会尝试两件事:
getPasswordAuthentication
的{{1}}中添加一个日志行,看看它是否被有效调用。如果未打印任何内容,则应在检查之前检查是否添加了默认Authenticator
。你说你是在Authenticator
中做的,所以它应该没问题,但确定是好的。避免使用Authenticator(至少用于测试目的)并直接在HTTP请求中发送身份验证信息。我通常这样做:
onCreate()
答案 1 :(得分:2)
问题是,当标头中包含的凭据不正确时,401 Unauthorized
标头缺少和时会发送Authorization
状态。因此,我的应用程序不断发送相同的请求无济于事。因此,我在我的CustomAuthenticator
:
public class CustomAuthenticator extends Authenticator {
public static int RETRIES = 3;
int mRetriesLeft;
Context mContext;
public CustomAuthenticator(Context context){
super();
mRetriesLeft = RETRIES;
mContext = context;
}
@Override
protected PasswordAuthentication getPasswordAuthentication() {
Log.i(getClass().getName(), "getPasswordAuthentication() - mCounter: " + mRetriesLeft);
if(mRetriesLeft > 0){
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(mContext);
String username = sharedPreferences.getString(SettingsActivity.KEY_USERNAME_PREFERENCE, null);
String password = sharedPreferences.getString(SettingsActivity.KEY_PASSWORD_PREFERENCE, null);
mRetriesLeft--;
return new PasswordAuthentication(username, password.toCharArray());
} else {
Log.w(getClass().getName(), "No more retries. Returning null");
mRetriesLeft = RETRIES;
return null;
}
}
public void reset(){
mRetriesLeft = RETRIES;
}
}
但是,我应该说我不喜欢这个解决方案,所以没有接受它。您必须记住在发出新请求时重置计数器(我在AsyncTask.onPreExecute()
中执行此操作),否则每三个请求都将失败。此外,我确信必须有一种本地方式来做到这一点,虽然在搜索文档后我找不到它。如果有人能指出我,我仍然会非常感激。
答案 2 :(得分:0)
我不知道我是否对,但我的解决方案已经为我工作了一整天而没有任何故障。
尝试这样做
byte[] buf = new byte[4096];
Inputstream is;
do
{
http conn code etc;
is=conn.getInputStream();
if(is.read(buf)==0)
{
flag=1;
}
//u can either is.close(); or leave as is
//code
int serverResponseCode = connection.getResponseCode();
String serverResponseMessage = connection.getResponseMessage();
conn.disconnect();
} while(flag==1);