Java ServerSocket close() method

The close() method of ServerSocket class is used to close this socket. Any thread currently blocked in accept() will throw a SocketException. The associated channel is also closed by it if it has any.

Syntax

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException - if an I/O error occurs when closing the socket.

Example 1

Server Application

import java.io.IOException;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class ServerAppCloseExample1 {

	public static void main(String[] args) throws IOException {

		String str;
		ServerSocket s1=new ServerSocket(1408);
		Socket ss=s1.accept();
		Scanner sc=new Scanner(ss.getInputStream());
		str=sc.nextLine();
		PrintStream p=new PrintStream(ss.getOutputStream());
		p.println("hello client");
		System.out.println("Message send by client : "+str);
		s1.close();
		System.out.println("Server closed");
	}
}

Output:

Client Application:

import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class ClientAppCloseExample1 {
public static void main(String arg[]) throws UnknownHostException,IOException
{
	String number,temp;
		Scanner sc=new Scanner(System.in);
		Socket s=new Socket("127.0.0.1",1408);
		Scanner sc1=new Scanner(s.getInputStream());
		System.out.println("send any massage ");
		number=sc.nextLine();
		PrintStream p=new PrintStream(s.getOutputStream());
		p.println(number);
		temp=sc1.nextLine();
		System.out.println("Massage sent by Server: "+temp);
		//calling close method
		s.close();
	}
}

Output:

Example 2:

Server Application

import java.io.IOException;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class ServerAppCloseExample2 {
	public static void main(String[] args) throws IOException {
		String str;
		ServerSocket s1=new ServerSocket(1408);
		Socket ss=s1.accept();
		Scanner sc=new Scanner(ss.getInputStream());
		str=sc.nextLine();
		PrintStream p=new PrintStream(ss.getOutputStream());
		p.println("hello client");
		System.out.println("Message send by client : "+str);
		if(!ss.isClosed())
		{
		s1.close();
		System.out.println("Server closed");
		}
	}
}

Output:

Client Application:

import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;
public class ClientAppCloseExample2 {
public static void main(String arg[]) throws UnknownHostException,IOException
{
	String number,temp;
		Scanner sc=new Scanner(System.in);
		Socket s=new Socket("127.0.0.1",1408);
		Scanner sc1=new Scanner(s.getInputStream());
		System.out.println("send any massage ");
		number=sc.nextLine();
		PrintStream p=new PrintStream(s.getOutputStream());
		p.println(number);
		temp=sc1.nextLine();
		System.out.println("Massage sent by Server: "+temp);
		//calling close method
		s.close();
	}
}

Output: