land.java

提供用户登陆

package MyPackage;
import java.awt.*;
import java.net.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.*;
import MyPackage.*;
import MyPackage.GuiRegist;
import MyPackage.GuiClient;
//import MyPackage.Main;
public class  Land{//登陆界面
	public static Socket socket2=null;
	public static TextField t1=null;
	public static TextField t2=null;
	public static Frame f=null;
    Panel p1=null;
	Panel p2=null;
	Panel p21=null;
	Panel p22=null;
	Panel p3=null;
	Panel p4=null;
	Panel p5=null;
	Panel p6=null;
	Panel p7=null;
	
    //按钮
	Button b1=null;
	Button b2=null;
	Button b3=null;
	Button b4=null;
       //标签
	Label l1=null;
	Label l2=null;
	Label l3=null;
	Label l4=null;
	Label l5=null;
	Label l6=null;
	Checkbox c1=null;
	public Land(){
		try{
			socket2=new Socket("172.40.83.44",6700);
		}catch(Exception e){}
		f=new Frame("GUI多人聊天 - 用户登陆                                                        ");
		//面板
		p1=new Panel();
		p2=new Panel();
		p21=new Panel();
		p22=new Panel();
		p3=new Panel();
		p4=new Panel();
		p5=new Panel();
		p6=new Panel();
		p7=new Panel();
		
        //按钮
		b1=new Button("R");
		b2=new Button("登陆(L)");
		b3=new Button("注册账号(R)");
		b4=new Button("R");
        //标签
		l1=new Label("用户登陆");
		l2=new Label("账号");
		l3=new Label("密码");
		l4=new Label("忘记密码");
		l5=new Label("R");
		l6=new Label("R");
        //单行文本框
	    t1=new TextField();
		t2=new TextField();
		//复选框
		c1=new Checkbox("自动登陆(A)",false);
        //面板1(Panel 1)
        t1.setEchoChar('*');
		b2.addActionListener(new AscendsListener());//侦听“登陆"的事件
		b3.addActionListener(new RegisterListener());//侦听"注册"事件	
		f.addWindowListener(new MyWindowsListener());


		p1.setLayout(new FlowLayout(FlowLayout.LEFT));
		//p1.setBackground(Color.white);
		l5.setBackground(Color.lightGray);
		p1.add(l5);
		p1.add(l1);
        //面板2（Panel 2它又由两个面板11、12组合而成)
		p21.setLayout(new GridLayout(2,1,5,10));
		p21.add(l2);
		p21.add(l3);
		p22.setLayout(new GridLayout(2,1,5,10));
		p22.add(t2);
		t1.setColumns(25);
		p22.add(t1);
		p2.setLayout(new FlowLayout(FlowLayout.LEFT,5,0));
		p2.add(p21);
		p2.add(p22);		        
        //面板3(Panel 3)
		p3.setLayout(new FlowLayout(FlowLayout.LEFT,30,0));
		p3.add(c1);

        //面板4(Panel 4)
		p4.setLayout(new FlowLayout(FlowLayout.LEFT,5,0));
	    l6.setBackground(Color.lightGray);
        p4.add(l6);
		p4.add(l4);
		//面板5(Panel 5)        
		p5.setLayout(new FlowLayout(FlowLayout.CENTER,30,2));
		p5.add(b2);
		p5.add(b3);
        //frame界面
    
		p6.setLayout(new BorderLayout(40,5));
        p6.add("North",p1);
		p6.add("Center",p2);
		p6.add("South",p3);
		
		p7.setLayout(new BorderLayout());
        p7.add("North",p6);      
		p7.add("Center",p4);
		p7.add("South",p5);
               
		f.setLayout(new FlowLayout(FlowLayout.CENTER));
		f.add(p7);

		f.setSize(350,220);
		f.setLocation(300,300);
		f.setBackground(Color.gray);
		f.setResizable(false);
		f.setVisible(true);
	}
	/*public static void main(String[] args) 
	{
		new Land();
	}*/
}

class MyWindowsListener extends WindowAdapter{
	public void windowClosing(WindowEvent e){
		System.exit(1);
	}
};


class RegisterListener implements ActionListener{
	public void actionPerformed(ActionEvent e){
		Land.f.setVisible(false);
		new GuiRegist();
	}
}

class AscendsListener implements ActionListener{
	public void actionPerformed(ActionEvent e){
		new SR();
	}
}

class SR{
	String s;
	BufferedReader is=null;
	PrintWriter os=null;
	public SR(){
        String line=null;
		String s1,s2;
		System.out.println("正式登陆");
		try{
			is=new BufferedReader(new InputStreamReader(Land.socket2.getInputStream()));
			os=new PrintWriter(Land.socket2.getOutputStream());
			
		}catch(Exception e1){System.out.println("异常1:"+e1);}
		System.out.println("输出到字节流");
		s1=Land.t2.getText();//取得用户名
		s2=Land.t1.getText();//取得密码
		if((s1.toLowerCase()).equals("everybody")){//标识所有用户不能用everybody这类用户名登陆
			new Message1("3");
			return;
		}
		s=s1+":"+s2;
        System.out.println("用户名:密码"+s);
		os.println(s);
		os.flush();
        System.out.println("输出结束");
			while(true){
				try{
					line=is.readLine();
				}catch(Exception e1){
				    System.out.println("异常2:"+e1);
				}
				System.out.println("输出:"+line);
				if(line==null)break;
				if(line.equals("0")){
					System.out.println("用户名或密码错误");
					new Message1("0");
					break;
				}
				else if(line.equals("1")){
					System.out.println("正常登陆");
					new Message1("1");
//                    System.out.println("UserName.string"+UserName.string);
					//UserName.string=s1;
					
			//		System.out.println("UserName.String:"+UserName.string);
					try{
						Land.socket2.close();
					    Land.f.setVisible(false);//设置此窗体不可见
					}catch(IOException e2){}
					new GuiClient(s1);//用用户名来实例化客户端。
					break;
				}
				else if(line.equals("2")){
					System.out.println("该用户已经在线");
					new Message1("2");
					return;
				}
			}
	}
}


class Message1{
	public Message1(String s){
		int type=JOptionPane.PLAIN_MESSAGE;
		String title="Message Dialog";
		String message="";
		if(s.equals("0")){
			type=JOptionPane.WARNING_MESSAGE;
            message="用户名或密码错误";
		}
		else if(s.equals("1")){
			type=JOptionPane.INFORMATION_MESSAGE;
			message="登陆成功\n用户名:"+Land.t2.getText()+"\n密码:"+Land.t1.getText();
		}
		else if(s.equals("2")){
			type=JOptionPane.WARNING_MESSAGE;
			message="该用户已经在线，请重新登陆";
		}
		else if(s.equals("3")){
			type=JOptionPane.WARNING_MESSAGE;
			message="您不能用该用户名登陆，您的权限不够";
		}
		JOptionPane.showMessageDialog(Land.f,message,title,type);
	}		
		
};