Question

I have this TCP server running Because UDP server was able to accept large packets but ISP blocks my UDP packets even i have Public IP and Static services. But now decided to change it to TCP but i have a large stack now to replace with UDP to TCP.

Here is the server which is running but it does not at once receive a large packet, how can i increase it to unlimited or maximum size or etc?

1) Is there any way with this?

public void run() 
{
    while(true) 
    {
        byte[] buf=new byte[5024]; <<< not helping!!
        int bytes_read = 0;
        try {                                
            bytes_read = sockInput.read(buf, 0, buf.length);                  
            String data = null;
            data = new String(buf, 0, bytes_read);                   
            System.out.println("[TCP]: incomeing data: " +  bytes_read + " bytes, data=" +data);
     }
 }

2) Is there any way with this?

public TCPHandler(Socket sock) throws IOException 
{
    sock.setReceiveBufferSize(10*1024 +1024); //<<<<< not helping !!!
    sock.setSendBufferSize(10*1024+1024);
    this.sock = sock;
    sockInput = sock.getInputStream();
    sockOutput = sock.getOutputStream();
    this.myThread = new Thread(this);
}

None is allowing me to handle large so that i can switch from UDP to TCP. Any ideas!!

Answer 1

The trouble you’re having is how InputStreams work. When you call read(buf,offset,length) it doesn’t always read length bytes everytime. It simply reads what is available() on the InputStream, and returns the number of bytes it read. So you need to continue to call read until you’ve actually read length bytes.

int len = 0;
int expectedLength = sockInput.readInt();
byte[] buf = new byte[ expectedLength ];
while( len != buf.length ) {
   len += sockInput.read( buf, len, buf.length );
}

// now you have a buffer with expectedLength data in it.

You can also look at using DataInputStream.readFully() by wrapping your

DataInputStream ds = new DataInputStream( sock.getInputStream() );
ds.readFully( buf, 0, buf.length );

http://docs.oracle.com/javase/6/docs/api/java/io/DataInputStream.html

But if you’re really just after a String you should do this:

Reader reader = new InputStreamReader( sockInput.getInputStream(), "UTF-8" );

Same rules for read( char[], offset, length ) as read( byte[], offset, length )