exercise20_2client.java

这是一个基于JAVA的网络编程的例子

// Exerise20_2Client.java
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class Exercise20_2Client extends JFrame implements ActionListener {
  // Text fields
  private JTextField jtfName = new JTextField(32);
  private JTextField jtfStreet = new JTextField(32);
  private JTextField jtfCity = new JTextField(20);
  private JTextField jtfState = new JTextField(2);
  private JTextField jtfZip = new JTextField(5);

  // Buttons
  private JButton jbtRegister = new JButton("Register");
  private JButton jbtView = new JButton("View");

  private Socket socket;

  private BufferedReader in;
  private PrintWriter out;

  public Exercise20_2Client() {

    // Panel p1 for holding labels Name, Street, and City
    JPanel p1 = new JPanel();
    p1.setLayout(new GridLayout(3, 1));
    p1.add(new JLabel("Name"));
    p1.add(new JLabel("Street"));
    p1.add(new JLabel("City"));

    // Panel jpState for holding state
    JPanel jpState = new JPanel();
    jpState.setLayout(new BorderLayout());
    jpState.add(new JLabel("State"), BorderLayout.WEST);
    jpState.add(jtfState, BorderLayout.CENTER);

    // Panel jpZip for holding zip
    JPanel jpZip = new JPanel();
    jpZip.setLayout(new BorderLayout());
    jpZip.add(new JLabel("Zip"), BorderLayout.WEST);
    jpZip.add(jtfZip, BorderLayout.CENTER);

    // Panel p2 for holding jpState and jpZip
    JPanel p2 = new JPanel();
    p2.setLayout(new BorderLayout());
    p2.add(jpState, BorderLayout.WEST);
    p2.add(jpZip, BorderLayout.CENTER);

    // Panel p3 for holding jtfCity and p2
    JPanel p3 = new JPanel();
    p3.setLayout(new BorderLayout());
    p3.add(jtfCity, BorderLayout.CENTER);
    p3.add(p2, BorderLayout.EAST);

    // Panel p4 for holding jtfName, jtfStreet, and p3
    JPanel p4 = new JPanel();
    p4.setLayout(new GridLayout(3, 1));
    p4.add(jtfName);
    p4.add(jtfStreet);
    p4.add(p3);

    // Place p1 and p4 into jpAddress
    JPanel jpAddress = new JPanel(new BorderLayout());
    jpAddress.add(p1, BorderLayout.WEST);
    jpAddress.add(p4, BorderLayout.CENTER);

    // Set the panel with line border
    jpAddress.setBorder(new BevelBorder(BevelBorder.RAISED));

    // Add buttons to a panel
    JPanel jpButton = new JPanel();
    jpButton.add(jbtRegister);
    jpButton.add(jbtView);

    // Add jpAddress and jpButton to the frame
    getContentPane().add(jpAddress, BorderLayout.CENTER);
    getContentPane().add(jpButton, BorderLayout.SOUTH);

    jbtRegister.addActionListener(this);
    jbtView.addActionListener(this);

	try {
	  socket = new Socket("127.0.0.1", 8000);

      in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
      out = new PrintWriter(socket.getOutputStream(), true);
    }
    catch(IOException ex) {
      System.out.println("Error " + ex);
    }

  }

  /** Handle button actions */
  public void actionPerformed(ActionEvent e) {

    try {
      if (e.getSource() == jbtRegister) {
	    out.println("Register");
		out.println(jtfName.getText().trim());
		out.println(jtfStreet.getText().trim());
		out.println(jtfCity.getText().trim());
        out.println(jtfState.getText().trim());
        out.println(jtfZip.getText().trim());
      }
      else if (e.getSource() == jbtView) {
	    out.println("View");
		out.println(jtfName.getText().trim());

		String command = in.readLine();
		System.out.println(command);

		if(command.equals("not found")){
	      jtfName.setText(command);
	    }
	    else{
		  jtfStreet.setText(in.readLine());
          jtfCity.setText(in.readLine());
          jtfState.setText(in.readLine());
          jtfZip.setText(in.readLine());
	    }

      }
    }
    catch(IOException ex) {
      System.out.print("Error: " + ex);
    }
  }

  public static void main(String[] args) {
    Exercise20_2Client frame = new Exercise20_2Client();
    frame.pack();
    frame.setTitle("Exercise20_2Client");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }
}