Java Socket getInputStream() method

The getInputStream() method of Java Socket class returns an input stream for the given socket. If you close the returned InputStream, then it will close the linked socket.

Syntax

Parameter

Return

The getInputStream() returns an input stream for reading bytes from this socket.

Throws

IOException- if an Input/Output error occurs while creating the input stream or if this socket is closed or the given socket is not connected, or the socket input has been shut down using shutdownInput()

Example 1

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.*;
public class JavaSocketGetInputStreamExample1  {
    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);
        DataInputStream inputStream=new DataInputStream(
                new BufferedInputStream(socket.getInputStream()));
        System.out.println("Input Stream: "+inputStream);
    }
 }

Test it Now

Output:

Input Stream: java.io.DataInputStream@1540e19d

Example 2

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.*;
public class JavaSocketGetInputStreamExample2  {
    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();
        //getInputStream() returns an input stream for the given socket
        //An Input/Output error occurs as this socket is closed 
        DataInputStream inputStream=new DataInputStream(
                new BufferedInputStream(socket.getInputStream()));
        System.out.println("Input Stream: "+inputStream);
    }
 }

Test it Now

Output:

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.getInputStream(Socket.java:903)
	at com.javaTpoint.JavaSocketGetInputStreamExample2.main(JavaSocketGetInputStreamExample2.java:24)

Example 3

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.*;
public class JavaSocketGetInputStreamExample3  {
    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);
        //getInputStream() returns an input stream for the given socket
        //An Input/Output error occurs as this socket is not connected
        DataInputStream inputStream=new DataInputStream(
                new BufferedInputStream(socket.getInputStream()));
        System.out.println("Input Stream: "+inputStream);
    }
 }

Test it Now

Output:

Exception in thread "main" java.net.SocketException: Socket is not connected
	at java.net.Socket.getInputStream(Socket.java:905)
	at com.javaTpoint.JavaSocketGetInputStreamExample3.main(JavaSocketGetInputStreamExample3.java:20)

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