Read Data From Http Response rarely throws BindException: Address already in use

问题

I use following code to read data form http request. In general cases it works good, but some time "httpURLConnection.getResponseCode()" throws java.net.BindException: Address already in use: connect

     ............
     URL url = new URL( strUrl );
     httpURLConnection = (HttpURLConnection)url.openConnection();
     int responseCode = httpURLConnection.getResponseCode();
     char charData[] = new char[HTTP_READ_BLOCK_SIZE];
     isrData = new InputStreamReader( httpURLConnection.getInputStream(), strCharset );
     int iSize = isrData.read( charData, 0, HTTP_READ_BLOCK_SIZE );
     while( iSize > 0 ){
            sbData.append( charData, 0, iSize );
            iSize = isrData.read( charData, 0, HTTP_READ_BLOCK_SIZE );
     }
     .................





 finally{
            try{
                if( null != isrData ){
                    isrData.close();
                    isrData = null;
                }

                if( null != httpURLConnection ){
                    httpURLConnection.disconnect();
                    httpURLConnection = null;
                }

                strData = sbData.toString();
             }
            catch( Exception e2 ){
            }

The code running on Java 1.6, Tomcat 6. Thank you

回答1:

Get rid of the disconnect() and close the Reader instead. You are running out of local ports, and using disconnect() disables HTTP connection pooling which is the solution to that.

回答2:

You need to close() the Reader after completely reading the stream. This will free up underlying resources (sockets, etc) for future reuse. Otherwise the system will run out of resources.

The basic Java IO idiom for your case is the following:

Reader reader = null;
try {
    reader = new InputStreamReader(connection.getInputStream(), charset);
    // ...
} finally {
    if (reader != null) try { reader.close(); } catch (IOException logOrIgnore) {}
}

See also:

• Java IO tutorial
• How to use URLConnection?

来源：https://stackoverflow.com/questions/4205210/read-data-from-http-response-rarely-throws-bindexception-address-already-in-use