java网络编程

网络编程的基础是网络上服务端和客户端，他们通过套接字进行通信

import java.net.*;
import java.io.*;
 
public class Client
{
    // initialize socket and input output streams
    private Socket socket            = null;
    private DataInputStream  input   = null;
    private DataOutputStream out     = null;
 
    // constructor to put ip address and port
    public Client(String address, int port)
    {
        // establish a connection
        try
        {
            socket = new Socket(address, port);
            System.out.println("Connected");
 
            // takes input from terminal
            input  = new DataInputStream(System.in);
 
            // sends output to the socket
            out    = new DataOutputStream(socket.getOutputStream());
        }
        catch(UnknownHostException u)
        {
            System.out.println(u);
        }
        catch(IOException i)
        {
            System.out.println(i);
        }
 
        // string to read message from input
        String line = "";
 
        // keep reading until "Over" is input
        while (!line.equals("Over"))
        {
            try
            {
                line = input.readLine();
                out.writeUTF(line);
            }
            catch(IOException i)
            {
                System.out.println(i);
            }
        }
 
        // close the connection
        try
        {
            input.close();
            out.close();
            socket.close();
        }
        catch(IOException i)
        {
            System.out.println(i);
        }
    }
 
    public static void main(String args[])
    {
        Client client = new Client("127.0.0.1", 5000);
    }
}

import java.net.*;
import java.io.*;
 
public class Server
{
    //initialize socket and input stream
    private Socket          socket   = null;
    private ServerSocket    server   = null;
    private DataInputStream in       =  null;
 
    // constructor with port
    public Server(int port)
    {
        // starts server and waits for a connection
        try
        {
            server = new ServerSocket(port);
            System.out.println("Server started");
 
            System.out.println("Waiting for a client ...");
 
            socket = server.accept();
            System.out.println("Client accepted");
 
            // takes input from the client socket
            in = new DataInputStream(
                new BufferedInputStream(socket.getInputStream()));
 
            String line = "";
 
            // reads message from client until "Over" is sent
            while (!line.equals("Over"))
            {
                try
                {
                    line = in.readUTF();
                    System.out.println(line);
 
                }
                catch(IOException i)
                {
                    System.out.println(i);
                }
            }
            System.out.println("Closing connection");
 
            // close connection
            socket.close();
            in.close();
        }
        catch(IOException i)
        {
            System.out.println(i);
        }
    }
 
    public static void main(String args[])
    {
        Server server = new Server(5000);
    }
}

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