socketexample.java

JAVA SE6 全方位学习 朱仲杰 编著 机械工业出版社出版

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.net.*;
import java.io.*;

public class SocketExample extends Applet
{
  private Socket sock;
  private DataInputStream dataIn;
  private DataOutputStream dataOut;

  String srvName;
  int srvPort;
  Label label1,label2;
  TextField textfield_send,textfield_receive;
  Button button_send;
  
  public void init()
  {
  	setLayout(new GridLayout(2,3));
  	
	label1 = new Label("请输入要发送的字符串：");
	label2 = new Label("Server 返回的字符串：");
	textfield_send = new TextField();
	textfield_receive = new TextField();
	textfield_receive.setEditable(false);
	
	srvName = "127.0.0.1";
	srvPort = 7;
	makeConnection();

	button_send = new Button("发送");
	button_send.addActionListener(new ActionListener()
	{
		public void actionPerformed(ActionEvent ae)
		{
			send_recive();
		}
	});

	add(label1);
	add(textfield_send);
	add(button_send);
	add(label2);
	add(textfield_receive);

  }

  private void send_recive()
  {
	try
	{
		dataOut.writeUTF(textfield_send.getText());
		dataOut.flush();
		System.out.println(textfield_send.getText());
		
		textfield_receive.setText(dataIn.readUTF());
	}
	catch (IOException IOE)
	{
		System.err.println(IOE);
	}
  }
  
  private void makeConnection()
  {
    try
    {
      InetAddress srvAddr=InetAddress.getByName(srvName);
      
      sock=new Socket(srvAddr,srvPort);
      dataIn=new DataInputStream(new BufferedInputStream(sock.getInputStream()));
      dataOut=new DataOutputStream(new BufferedOutputStream(sock.getOutputStream()));
      System.err.println("Connection to server ok");
    }
    catch (IOException io)
    {
      System.err.println("Error:"+io);
    }
  }

  public void stop()
  {
    try
    {
      dataOut.close();
      dataIn.close();
      sock.close();
    }
    catch (IOException io) {};
  }
}