socket编程源码

package socket;

import java.awt.BorderLayout;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Date;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

@SuppressWarnings("serial")
public class Server extends JFrame {
    private JTextArea jta = new JTextArea();
   
    public static void main(String [] args) {
    new Server();
    }
   
    public Server() {
    getContentPane().setLayout(new BorderLayout());
    getContentPane().add(new JScrollPane(jta), BorderLayout.CENTER);
   
    setTitle("Server");
    setSize(500, 300);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
   
    try {
    ServerSocket serverSocket = new ServerSocket(8000);
    jta.append("Server started at " + new Date() + "\n");
   
    Socket socket = serverSocket.accept();
   
    DataInputStream inputFromClient = new DataInputStream(socket.getInputStream());
    DataOutputStream outputToClient = new DataOutputStream(socket.getOutputStream());
   
    while(true) {
        double radius = inputFromClient.readDouble();
       
        double area = radius * radius * Math.PI;
       
        outputToClient.writeDouble(area);
       
        jta.append("Radius received from client: " + radius + "\n");
        jta.append("Area found: " + area + '\n');
    }
    } catch (IOException ex) {
    System.err.println(ex);
    }
   
   
    }
}
---------------------------------------------

package socket;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class Client extends JFrame implements ActionListener {

private JTextField jtf = new JTextField();

private JTextArea jta = new JTextArea();

private DataOutputStream toServer;
private DataInputStream fromServer;

public static void main(String [] args) {
new Client();
}
public void actionPerformed(ActionEvent e) {
String actionCommand = e.getActionCommand();

if (e.getSource() instanceof JTextField) {
try {
double radius = Double.parseDouble(jtf.getText().trim());

toServer.writeDouble(radius);
toServer.flush();

double area = fromServer.readDouble();

jta.append("radius is " + radius + "\n");
jta.append("area received from the server is " + area + "\n");
} catch (IOException ex) {
System.err.println(ex);
}
}
}
public Client () {
JPanel p = new JPanel();
p.setLayout(new BorderLayout());
p.add(new JLabel("Enter radius "), BorderLayout.WEST);
p.add(jtf, BorderLayout.CENTER);
jtf.setHorizontalAlignment(JTextField.RIGHT);

this.getContentPane().setLayout(new BorderLayout());
this.getContentPane().add(p, BorderLayout.NORTH);
this.getContentPane().add(new JScrollPane(jta), BorderLayout.CENTER);

jtf.addActionListener(this);

setTitle("Server");
    setSize(500, 300);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
   
    try {
    Socket socket = new Socket("localhost", 8000);
   
    fromServer = new DataInputStream(socket.getInputStream());
   
    toServer = new DataOutputStream(socket.getOutputStream());
   
    } catch (IOException ex) {
    jta.append(ex.toString() + "\n");
    }

}



}