loginframe.java

关于网上考试系统的

package com.tarena.exam.gui;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

import com.tarena.exam.model.Request;
import com.tarena.exam.model.Student;
import com.tarena.exam.util.SocketUtil;

public class LoginFrame  implements ActionListener{
	private JFrame jf;
	private JLabel title;
	private JLabel idLabel,passwdLabel;
	private JTextField idField;
	private JPasswordField passwdField;
	private JButton ok,cancel;
	
	public LoginFrame(){
		jf=new JFrame("考生登录");
		title=new JLabel("考生登录");
		idLabel=new JLabel("学号:");
		passwdLabel=new JLabel("密码:");
		idField=new JTextField(15);
		passwdField=new JPasswordField(15);
		ok=new JButton("登录");
		cancel=new JButton("取消");
		init();
		addEventHandler();
	}
	private void init(){
		JPanel northPanel=new JPanel();
		northPanel.add(title);
		JPanel centerPanel=new JPanel();
		centerPanel.add(idLabel);
		centerPanel.add(idField);
		centerPanel.add(passwdLabel);
		centerPanel.add(passwdField);
		JPanel southPanel=new JPanel();
		southPanel.add(ok);
		southPanel.add(cancel);
		
		jf.add(southPanel,BorderLayout.SOUTH);
		jf.add(centerPanel,BorderLayout.CENTER);
		jf.add(northPanel,BorderLayout.NORTH);
	}
	
	private void addEventHandler(){
		ok.addActionListener(this);
		cancel.addActionListener(this);
	}
	
	public void actionPerformed(ActionEvent e) {
		if(e.getActionCommand().equals("登录")){
			if(idField.getText().trim().equals("") || new String(passwdField.getPassword()).trim().equals("")){
				JOptionPane.showMessageDialog(jf,"ID 和密码不能为空！");
				return;
			}
			String id=idField.getText().trim();
			String passwd=new String(passwdField.getPassword()).trim();
			try {
				SocketUtil.createSocket();
				ObjectOutputStream oos=SocketUtil.getOutputStream();
				Request req=new Request(Request.LOGIN_REQUEST);
				req.addData("id",id);
				req.addData("passwd",passwd);
				oos.writeObject(req);
				oos.flush();
				ObjectInputStream ois=SocketUtil.getInputStream();
				Student stu=(Student)ois.readObject();
				List list=(List)ois.readObject();
				if(stu!=null){
					new SelectSubjectFrame(stu,list).showMe();
					jf.dispose();
				}
			} catch (Exception e1) {
				e1.printStackTrace();
			} 
			
			
			//????
			//(1)获取学号和密码的值
			//(2)发送请求给服务器
			//(3)接受服务器的应答
			//(4)解析应答结果
		}else if(e.getActionCommand().equals("取消")){
			System.exit(0);
		}
		
	}
	
	public void showMe(){
		jf.setSize(240,180);
		jf.setResizable(false);
		jf.setLocation(400,300);
		jf.setVisible(true);
		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	
	public static void main(String[] args){
		new LoginFrame().showMe();
	}

}