[英]HTTPUrlConnection error (Can't open OutputStream after reading from an inputStream)
我是Java的新手,在使用HTTPURLConnection在Android上發送多個帖子請求時遇到了上述錯誤。 我編寫了一個HTTPTransport類,我想在其中使用sendMessage和recvMessage方法。
public class HTTPTransport
{
private HttpURLConnection connection;
public HTTPTransport()
{
URL url = new URL("http://test.com");
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "application/octet-stream");
connection.setRequestProperty("Accept-Encoding", "gzip");
connection.setRequestProperty("Connection", "Keep-Alive");
}
public void sendMessage(byte[] msgBuffer, long size)
{
try
{
DataOutputStream dos = new DataOutputStream(connection.getOutputStream());
dos.write(msgBuffer, 0, (int)size);
dos.flush();
dos.close();
dos.close();
}
catch( IOException e )
{
// This exception gets triggered with the message mentioned in the title.
Log.e(TAG, "IOException: " + e.toString());
}
}
public byte[] recvMessage()
{
int readBufLen = 1024;
byte[] buffer = new byte[readBufLen];
int len = 0;
FileOutputStream fos = new FileOutputStream(new File("/sdcard/output.raw"));
DataInputStream dis = new DataInputStream(connection.getInputStream());
while((len = dis.read(buffer, 0, readBufLen)) > 0)
{
Log.d(TAG, "Len of recd bytes " + len + ", Byte 0 = " + buffer[0]);
//Save response to a file
fos.write(buffer, 0, len);
}
fos.close();
dis.close();
return RecdMessage;
}
}
我能夠使用sendMessage和recvMessage成功發送第一條消息。 當我嘗試發送第二個時,我看到了這個錯誤:IOException:java.net.ProtocolException:從inputStream讀取后無法打開OutputStream
請讓我知道如何寫這門課。
謝謝!
您需要為每個請求使用新的HttpURLConnection。 TCP連接本身將在后台匯集。 不要試圖自己這樣做。
您的HTTPUrlConnection
實現不允許您以這種方式重用連接 。 我相信你必須使用HttpConnectionManager
以你想要的方式使用Keep-Alive。
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