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   源码介绍

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一个很基础的Java实例，实现最基础的增删改查

账号：01101  密码：1234

package com.sqc.view;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.border.EmptyBorder;

import com.sqc.dao.UserDao;
import com.sqc.model.User;
import com.sqc.util.DbUtil;
import com.sqc.util.StringUtil;

import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.BoxLayout;
import java.awt.FlowLayout;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

import java.awt.Font;
import javax.swing.ImageIcon;
import javax.swing.JTextField;
import javax.swing.LayoutStyle.ComponentPlacement;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class LoginFra extends JFrame {

	private JPanel contentPane;
	private JTextField userName_text;
	private JPasswordField password_text;
	
	private DbUtil dbUtil=new DbUtil();
	private UserDao userDao=new UserDao();
	

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					LoginFra frame = new LoginFra();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public LoginFra() {
		setTitle("\u6854\u5B50\u9152\u5E97\u7BA1\u7406\u7CFB\u7EDF");
		setResizable(false);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 557, 444);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		
		JLabel password = new JLabel("\u5458\u5DE5\u53F7\uFF1A");
		password.setFont(new Font("华文行楷", Font.PLAIN, 18));
		password.setIcon(new ImageIcon(LoginFra.class.getResource("/image/head.png")));
		
		JLabel label = new JLabel("\u5BC6  \u7801\uFF1A");
		label.setFont(new Font("华文行楷", Font.PLAIN, 18));
		label.setIcon(new ImageIcon(LoginFra.class.getResource("/image/password.png")));
		
		userName_text = new JTextField();
		userName_text.setColumns(10);
		
		JButton btn_login = new JButton("\u767B      \u5F55");
		btn_login.setIcon(new ImageIcon(LoginFra.class.getResource("/image/accept.png")));
		btn_login.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				loginActionPerformed(e);
			}
		});
		btn_login.setFont(new Font("微软雅黑", Font.PLAIN, 18));
		
		JButton btn_cancel = new JButton("\u6E05      \u9664");
		btn_cancel.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				btn_cancelActionPerformed(e);
			}

		});
		btn_cancel.setIcon(new ImageIcon(LoginFra.class.getResource("/image/refersh.png")));
		btn_cancel.setFont(new Font("微软雅黑", Font.PLAIN, 18));
		
		password_text = new JPasswordField();
		
		JButton btnNewButton = new JButton("");
		btnNewButton.setIcon(new ImageIcon(LoginFra.class.getResource("/image/theme.jpg")));
		GroupLayout gl_contentPane = new GroupLayout(contentPane);
		gl_contentPane.setHorizontalGroup(
			gl_contentPane.createParallelGroup(Alignment.LEADING)
				.addGroup(gl_contentPane.createSequentialGroup()
					.addGap(69)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
						.addComponent(label)
						.addComponent(password))
					.addGap(39)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING, false)
						.addComponent(btnNewButton, GroupLayout.PREFERRED_SIZE, 148, GroupLayout.PREFERRED_SIZE)
						.addComponent(userName_text, GroupLayout.DEFAULT_SIZE, 202, Short.MAX_VALUE)
						.addComponent(password_text))
					.addContainerGap(127, Short.MAX_VALUE))
				.addGroup(gl_contentPane.createSequentialGroup()
					.addGap(93)
					.addComponent(btn_login)
					.addPreferredGap(ComponentPlacement.RELATED, 79, Short.MAX_VALUE)
					.addComponent(btn_cancel, GroupLayout.PREFERRED_SIZE, 151, GroupLayout.PREFERRED_SIZE)
					.addGap(67))
		);
		gl_contentPane.setVerticalGroup(
			gl_contentPane.createParallelGroup(Alignment.LEADING)
				.addGroup(gl_contentPane.createSequentialGroup()
					.addGap(33)
					.addComponent(btnNewButton, GroupLayout.PREFERRED_SIZE, 134, GroupLayout.PREFERRED_SIZE)
					.addGap(27)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
						.addComponent(password)
						.addComponent(userName_text, GroupLayout.PREFERRED_SIZE, 37, GroupLayout.PREFERRED_SIZE))
					.addGap(40)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
						.addComponent(label)
						.addComponent(password_text, GroupLayout.PREFERRED_SIZE, 37, GroupLayout.PREFERRED_SIZE))
					.addPreferredGap(ComponentPlacement.RELATED, 21, Short.MAX_VALUE)
					.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
						.addComponent(btn_login)
						.addComponent(btn_cancel, GroupLayout.PREFERRED_SIZE, 54, GroupLayout.PREFERRED_SIZE))
					.addGap(37))
		);
		contentPane.setLayout(gl_contentPane);
	}
	/**
	 * 登录事件处理
	 * @param e
	 */
	private void loginActionPerformed(ActionEvent evt) {
		String userName=this.userName_text.getText();
		String password=new String(this.password_text.getPassword());
		if(StringUtil.isEmpty(userName)){
			JOptionPane.showMessageDialog(null, "用户名不能为空！");
			return;
		}
		if(StringUtil.isEmpty(password)){
			JOptionPane.showMessageDialog(null, "密码不能为空！");
			return;
		}
		User user=new User(userName,password);
		Connection con=null;
		try {
			con=dbUtil.getCon();
			User currentUser=userDao.login(con, user);
			if(currentUser!=null){
				dispose();
				new MainFra().setVisible(true);
			}else{
				JOptionPane.showMessageDialog(null, "用户名或者密码错误！");
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			try {
				dbUtil.closeCon(con);
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	/**
	 * 重置事件处理
	 * @param e
	 */
	private void btn_cancelActionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		this.userName_text.setText("");
		this.password_text.setText("");
	}
}