Java Socket getOutputStream() method

The getOutputStream() method of Java Socket class returns an output stream for the given socket. If you close the returned OutputStream then it will close the linked socket.

Syntax

Parameter

Return

The getOutputStream() returns an output stream for writing bytes to this socket.

Throws

IOException- if an I/O error occurs when creating the output stream or if the socket is not connected.

Example 1

import java.io.DataOutputStream;
import java.io.IOException;
import java.net.*;
public class JavaSocketGetOutputStreamExample1  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the  socket with the inetAddress and port number
        socket.bind(socketAddress);
        //connect() method connects the specified socket to the server
        socket.connect(socketAddress);
        //getOutputStream() returns an output stream for writing bytes to this socket.
        DataOutputStream  outputStream=new DataOutputStream(socket.getOutputStream());
        System.out.println("Output Stream: "+outputStream);
    }
 }

Test it Now

Output:

Output Stream: java.io.DataOutputStream@1540e19d

Example 2

import java.io.DataOutputStream;
import java.io.IOException;
import java.net.*;
public class JavaSocketGetOutputStreamExample2  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the  socket with the inetAddress and port number
        socket.bind(socketAddress);
        //connect() method connects the specified socket to the server
        socket.connect(socketAddress);
        //closing the socket
        socket.close();
        //getOutputStream() returns an output stream for writing bytes to this socket.
        //An Input/Output error occurs as this socket is closed
        DataOutputStream  outputStream=new DataOutputStream(socket.getOutputStream());
        System.out.println("Output Stream: "+outputStream);
    }
 }

Test it Now

Output:

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.getOutputStream(Socket.java:943)
	at com.javaTpoint.JavaSocketGetOutputStreamExample2.main(JavaSocketGetOutputStreamExample2.java:22)

Example 3

import java.io.DataOutputStream;
import java.io.IOException;
import java.net.*;
public class JavaSocketGetOutputStreamExample3  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the  socket with the inetAddress and port number
        socket.bind(socketAddress);
        //getOutputStream() returns an output stream for writing bytes to this socket.
        //An Input/Output error occurs as this socket is not connected
        DataOutputStream  outputStream=new DataOutputStream(socket.getOutputStream());
        System.out.println("Output Stream: "+outputStream);
    }
 }

Test it Now

Output:

Exception in thread "main" java.net.SocketException: Socket is not connected
	at java.net.Socket.getOutputStream(Socket.java:945)
	at com.javaTpoint.JavaSocketGetOutputStreamExample3.main(JavaSocketGetOutputStreamExample3.java:20)

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