loginframe.java

一个applet servlet之间通过序列化对象通讯的例子

package espc;

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

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2006</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class LoginFrame extends JFrame {
  JLabel jLabel2 = new JLabel();
//  JPasswordField jPasswordField1 = new JPasswordField();
  JLabel jLabel1 = new JLabel();
  JTextField username = new JTextField();
  JButton jButton1 = new JButton();

  String bCommand="",userpw="",user="",ip="";
  String ServletString="";
  Properties prop = new Properties();
  String command ="";
  JPasswordField password = new JPasswordField();
  JLabel jLabel4 = new JLabel();

  public LoginFrame() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  private void jbInit() throws Exception {
    try {
      InputStream is = getClass().getResourceAsStream("ServletProperties.properties");
      prop.load(is);
      System.out.println("这是一句测试语句");
      if(is != null)
        is.close();
    }
    catch(IOException e){
      System.out.println("打开文件ServletProperties.properties时出现错误！");
    }

    ServletString = prop.getProperty("LoginServletString");

    this.setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
    this.setSize(new Dimension(265, 169));
    this.setTitle("用户登陆");
    this.addWindowListener(new LoginFrame_this_windowAdapter(this));

    //定义窗口显示位置
    Dimension dim=Toolkit.getDefaultToolkit().getScreenSize();
    int w=this.getSize().width;
    int h=this.getSize().height;
    int x=(dim.width-w)/2;
    int y=(dim.height-h)/2;
    this.setLocation(x,y);
    this.setResizable(false);

    username.setText("");
    username.setBounds(new Rectangle(80, 17, 121, 26));
    jLabel1.setText("用户名");
    jLabel1.setBounds(new Rectangle(28, 9, 76, 44));
    jLabel1.setFont(new java.awt.Font("Dialog", 0, 12));
    jLabel2.setFont(new java.awt.Font("Dialog", 0, 12));
    jLabel2.setText("密    码");
    jLabel2.setBounds(new Rectangle(26, 50, 76, 44));
    this.getContentPane().setLayout(null);
    jButton1.setBounds(new Rectangle(99, 100, 71, 30));
    jButton1.setFont(new java.awt.Font("Dialog", 0, 12));
    jButton1.setText("登    录");
    jButton1.addActionListener(new loginFrame_jButton1_actionAdapter(this));
    password.setBounds(new Rectangle(80, 59, 121, 26));
    password.setSelectionStart(15);
    password.setText("");
    password.setBounds(new Rectangle(80, 61, 121, 27));
    jLabel4.setBorder(BorderFactory.createLoweredBevelBorder());
    jLabel4.setText("jLabel4");
    jLabel4.setBounds(new Rectangle(52, 189, 166, 62));
    jLabel4.setVisible(false);
    this.getContentPane().add(jLabel2, null);
    this.getContentPane().add(password, null);
    this.getContentPane().add(jLabel1, null);
    this.getContentPane().add(username, null);
    this.getContentPane().add(jLabel4, null);
    this.getContentPane().add(jButton1, null);
    this.getContentPane().add(password, null);
  }

  void jButton1_actionPerformed(ActionEvent e) {
    user=username.getText();
    userpw=password.getText();
    if(!(user.equals("")||userpw.equals(""))){
      URL server;
      URLConnection con;
      ObjectOutputStream req;
      ObjectInputStream res = null;
      command="login";
      try {
        server = new URL(ServletString);     //以下三句建立连接
        con = server.openConnection ();
        con.setDoOutput (true);

        req = new ObjectOutputStream (new BufferedOutputStream(con.getOutputStream ()));  //提交请求
        req.writeUTF(command);
        req.writeUTF(user);
        req.writeUTF(userpw);
        req.flush ();
        req.close ();

        res = new ObjectInputStream (new BufferedInputStream(con.getInputStream ()));   //返回响应状态
//        bCommand="ok";
        bCommand = (String)res.readObject();
        ip= (String)res.readObject();
        String bMessage=(String)res.readObject();
        System.out.println(bCommand+ip+"连接成功！！！");
        System.out.println(bMessage);
        res.close ();
      }
      catch (MalformedURLException me) {
        System.out.println("Malformed URL: " + ServletString);
      }
      catch (IOException ignored) {
        System.out.println("io exception"+ignored.toString());
        ignored.printStackTrace ();
      }
      catch (ClassNotFoundException ex) {
        System.out.println("class not found");
      }
      finally {
      }
      if (bCommand != null && bCommand.equals("ok")) {
        {
          MainFrame tf=new MainFrame();
          tf.setVisible(true);
          this.dispose();
        }
      }
      else {
      //bMessage显示不能登录的原因；
        jLabel4.setVisible(true);
        jLabel4.setText("用户名或密码有误");
      }
    }
  }

  void this_windowOpened(WindowEvent e) {

  }

  void this_windowClosed(WindowEvent e) {

  }

  void this_windowClosing(WindowEvent e) {
    this.dispose();
  }
}

class loginFrame_jButton1_actionAdapter implements java.awt.event.ActionListener {
  LoginFrame adaptee;

  loginFrame_jButton1_actionAdapter(LoginFrame adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jButton1_actionPerformed(e);
  }
}

class LoginFrame_this_windowAdapter extends java.awt.event.WindowAdapter {
  LoginFrame adaptee;

  LoginFrame_this_windowAdapter(LoginFrame adaptee) {
    this.adaptee = adaptee;
  }
  public void windowOpened(WindowEvent e) {
    adaptee.this_windowOpened(e);
  }
  public void windowClosed(WindowEvent e) {
    adaptee.this_windowClosed(e);
  }
  public void windowClosing(WindowEvent e) {
    adaptee.this_windowClosing(e);
  }
}