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Socket class

A socket is simply an endpoint for communications between the machines. The Socket class can be used to create a socket.

Important methods

Method Description

1) public InputStream getInputStream() returns the InputStream attached with this socket.

2) public OutputStream getOutputStream() returns the OutputStream attached with this socket.

3) public synchronized void close() closes this socket

ServerSocket class

The ServerSocket class can be used to create a server socket. This object is used to establish communication with the clients.

Important methods

Method Description

1) public Socket accept() returns the socket and establish a connection between server and client.

2) public synchronized void close() closes the server socket.

MyServer

import java.io.*;
import java.net.*;
public class MyServer {
public static void main(String[] args){
try{
ServerSocket ss=new ServerSocket(6666);
Socket s=ss.accept();//establishes connection
DataInputStream dis=new DataInputStream(s.getInputStream());
String  str=(String)dis.readUTF();
System.out.println("message= "+str);
ss.close();
}catch(Exception e){System.out.println(e);}
}
}

MyClient

import java.io.*;
import java.net.*;
public class MyClient {
public static void main(String[] args) {
try{
Socket s=new Socket("localhost",6666);
DataOutputStream dout=new DataOutputStream(s.getOutputStream());
dout.writeUTF("Hello Server");
dout.flush();
dout.close();
s.close();
}catch(Exception e){System.out.println(e);}
}
}

What’s different between UDP, TCP，RMI

interface

sever

client

writing RMI services

what the different between binding and rebinding