login.java

学籍管理系统,可以实现多方面学生学籍的管理

/*
 * Created on 2005-12-7
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */

/**
 * @author lyqaiyz1
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
import java.net.*;
import java.io.*;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class login extends Applet implements Runnable,ActionListener
{
	  TextField txt_user;  
	  TextField txt_psw; 
	  
	  Label lab_user;
	  Label lab_psw;
	  
	  
	  Button btn_add=new Button();
	  Label tishi;
	  Label xianshi;
	  
	  Socket socket=null;
	  DataInputStream in=null;
	  DataOutputStream out=null;
	  Thread thread; 

	public void init(){
		  txt_user=new TextField(10);		 
		  txt_psw=new TextField(10);
		 
		  
		  lab_user=new Label("请输入用户名",Label.CENTER);
		  lab_psw=new Label("请输入密码",Label.CENTER);
		  
		  btn_add=new Button("注册");//又添加	  
		  tishi=new Label("正在连接到服务器,请稍等...",Label.CENTER);
		  tishi.setForeground(Color.red);
		  tishi.setFont(new Font("TimesRoman",Font.BOLD,24));
		  xianshi=new Label(" 提    示    结      果      ");
		  
		  Panel box1=new Panel();  
		  Panel box2=new Panel();  
		  Panel box3=new Panel();
		  Panel box4=new Panel();
		  Panel box5=new Panel();
		  Panel box6=new Panel();
		  Panel box7=new Panel();
		  Panel box8=new Panel();
		  Panel box9=new Panel();
		  Panel box10=new Panel();
		  Panel box11=new Panel();
		  Panel box12=new Panel();
		  
		  
	//	  box1.add(new Label("输入查询内容:",Label.CENTER));
		  
		  
		  box3.add(lab_user);
		  box3.add(txt_user);
		  box4.add(lab_psw);
		  box4.add(txt_psw);

		  box2.add(xianshi);
		  box1.add(btn_add);//又添加	 
	
		  add(tishi);
		  add(box1);
		  add(box3);
		  
		  add(box4);
		  add(box2);
		  btn_add.addActionListener(this);//又添加		  
		}
	public void start(){
		if(socket!=null&&in!=null&&out!=null)
      {  try
            {
              socket.close();
              in.close(); 
              out.close();
            }
        catch(Exception ee)
            {
            }
      }
   try
      {
        socket=new Socket(this.getCodeBase().getHost(), 6668);
        in=new DataInputStream(socket.getInputStream());
        out=new DataOutputStream(socket.getOutputStream());
      }
   catch (IOException ee)
      { 
       tishi.setText("连接失败");
      }
   if(socket!=null)
      {
        InetAddress address=socket.getInetAddress();
        tishi.setText("连接:"+address+"成功");
      } 
   if(thread==null)
      {
        thread=new Thread(this);
        thread.start();
      }
		}
	
	public void run(){
		String s=null;
	    while(true)
	     { 
	       try{
	             s=in.readUTF();
	            
	          }
	        catch (IOException e)
	          {
	            tishi.setText("与服务器已断开");
	            break;
	          }
	     xianshi.setText(s);
	    }

		}
	//..........
	public void actionPerformed(ActionEvent e)
	 {
	   if(e.getSource()==btn_add)
	     { 
	       String s1="",s2="";
	       String tianjia=btn_add.getLabel();//有写的
	      
	       s1=txt_user.getText();
	       s2=txt_psw.getText();
	       
	       
	      
	       String str=s1+","+s2;      
	       if(str.length()>0)		      
	        { 
	          try{
	              out.writeUTF(str);
	             }
	          catch(IOException e1)
	             {
	              tishi.setText("与服务器已断开");
	             } 
	        } 
	       else
	        {
	       	xianshi.setText("请填写");
	        }              
	       
	     }
	 }

	//............
		

}