example1103_tcpclient.java

使用TCP实现两个进程间的通信 （编写客户端与服务器端的Java程序）

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.*;

public class Example1103_TCPClient extends JFrame implements ActionListener
{
	JTextField hostfield;
	JTextField portfield;
	JTextField messfield;
	JButton sendbutt;
	JTextArea result;
	JLabel status;
	
	public Example1103_TCPClient()
	{
		super("TCP-Client");
		
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		
		Container con=getContentPane();
		
		hostfield=new JTextField();
		portfield=new JTextField();
		messfield=new JTextField();
		sendbutt=new JButton("发送");
		result=new JTextArea();
		status=new JLabel("ok");
		
		result.setEditable(false);
		sendbutt.addActionListener(this);
		
		Box box=Box.createHorizontalBox();
		box.add(new JLabel("目的地"));
		box.add(hostfield);
		box.add(new JLabel("端口"));
		box.add(portfield);
		box.add(new JLabel("消息内容"));
		box.add(messfield);
		box.add(sendbutt);
		
		con.add(box,"North");
		con.add(new JScrollPane(result),"Center");
		con.add(status,"South");
		
		setBounds(0,getToolkit().getScreenSize().height/2-20,getToolkit().getScreenSize().width,getToolkit().getScreenSize().height/2-20);
		setVisible(true);
	}
	
	public void actionPerformed(ActionEvent evt)
	{
		status.setText("ok");

		if (evt.getSource()==sendbutt)
		{
			try
			{
				String host=hostfield.getText();
				int port=Integer.parseInt(portfield.getText());
				Socket socket=new Socket(host,port);
				DataInputStream in=new DataInputStream(socket.getInputStream());
				DataOutputStream out=new DataOutputStream(socket.getOutputStream());
				String outmes=messfield.getText();
				out.writeUTF(outmes);
				String inmes=in.readUTF();
				result.append("Send: "+outmes+" ; Receive: "+inmes+" from "+socket.getInetAddress()+"\n");
				in.close();
				out.close();
				socket.close();
			}
			catch (UnknownHostException e)
			{
				status.setText("UnknownHostException");
			}
			catch (IOException e)
			{
				status.setText("IOException");
			}
			catch (NumberFormatException e)
			{
				status.setText("NumberFormatException");
			}
		}
	}
	
	public static void main(String[] args)
	{
		new Example1103_TCPClient();
	}
}