Java Socket setSendBufferSize () method

The setSendBufferSize () method of Java Socket class sets the SO_SNDBUF option to the given value for this socket. The size value should be greater than 0.

Syntax

Parameter

The parameter 'size' represents the size to which the send buffer size is set.

Return

Throws

IllegalArgumentException - if the size is 0 or less than zero.

SocketException - if an error is there in the underlying protocol, such as a TCP error.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketSetSendBufferSizeExample1  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //setSendBufferSize() sets the send buffer size or SO_SNDBUF option with the specified value
        socket.setSendBufferSize(67);
        //getSendBufferSize() method returns the buffer size(SO_SNDBUF) used by the platform for output
        System.out.println("Send Buffer size: "+socket.getSendBufferSize());
    }
}

Test it Now

Output:

Send Buffer size: 67

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketSetSendBufferSizeExample2  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //setSendBufferSize() sets the send buffer size or SO_SNDBUF option with the specified value
        //the buffer size should be greater than zero, else it will throw an exception.
        socket.setSendBufferSize(-67);
        //getSendBufferSize() method returns the buffer size(SO_SNDBUF) used by the platform for output
        System.out.println("Send Buffer size: "+socket.getSendBufferSize());
    }
}

Test it Now

Output:

Exception in thread "main" java.lang.IllegalArgumentException: negative send size
	at java.net.Socket.setSendBufferSize(Socket.java:1193)
	at com.javaTpoint.JavaSocketSetSendBufferSizeExample2.main(
	JavaSocketSetSendBufferSizeExample2.java:11)

Example 3

import java.io.IOException;
import java.net.*;
public class JavaSocketSetSendBufferSizeExample3  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //closing the socket
        socket.close();
        //setSendBufferSize() sets the send buffer size or SO_SNDBUF option with the specified value
        //it will throw an exception, else the socket is already closed.
        socket.setSendBufferSize(67);
        //getSendBufferSize() method returns the buffer size(SO_SNDBUF) used by the platform for output
        System.out.println("Send Buffer size: "+socket.getSendBufferSize());
    }
}

Test it Now

Output:

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.setSendBufferSize(Socket.java:1196)
	at com.javaTpoint.JavaSocketSetSendBufferSizeExample2.main(
	JavaSocketSetSendBufferSizeExample2.java:13)

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