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登陆界面（连接数据库，从数据库中获取账号密码）

2014-03-09 16:28 513 查看

package com.derun;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

public class JDBC {

private static final String dburl = "jdbc:mysql://localhost:3306/xuejava";

private static final String user = "suixin";

private static final String password = "123456";

public static Connection getConnection() {



Connection con = null;

try {

System.out.println("正在连接");

con = DriverManager.getConnection(dburl, user, password);

System.out.println("已连接");

} catch (SQLException ex) {

System.out.println("连接失败");

ex.printStackTrace();

}

return con;

}
}

package com.xuejava.iframe;

import com.derun.JDBC;

import com.derun.Login;

import com.xuejava.Library;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import javax.swing.JOptionPane;

public class LoginFrame extends javax.swing.JFrame {

public LoginFrame() {

initComponents();

this.setLocationRelativeTo(null);



}

@SuppressWarnings("unchecked")

// <editor-fold defaultstate="collapsed" desc="Generated Code">

private void initComponents() {

jLabel1 = new javax.swing.JLabel();

jPanel1 = new javax.swing.JPanel();

jPanel2 = new javax.swing.JPanel();

jLabel2 = new javax.swing.JLabel();

jLabel3 = new javax.swing.JLabel();

username = new javax.swing.JTextField();

password = new javax.swing.JPasswordField();

jPanel3 = new javax.swing.JPanel();

btn_login = new javax.swing.JButton();

btn_reset = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

jLabel1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/login.jpg"))); // NOI18N

getContentPane().add(jLabel1, java.awt.BorderLayout.PAGE_START);

jPanel1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));

jPanel1.setPreferredSize(new java.awt.Dimension(280, 200));

jPanel2.setMinimumSize(new java.awt.Dimension(280, 182));

jPanel2.setPreferredSize(new java.awt.Dimension(280, 150));

jLabel2.setText("用户名：");

jLabel3.setText("密码：");

username.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

usernameActionPerformed(evt);

}

});

javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);

jPanel2.setLayout(jPanel2Layout);

jPanel2Layout.setHorizontalGroup(

jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel2Layout.createSequentialGroup()

.addGap(31, 31, 31)

.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)

.addComponent(jLabel3)

.addComponent(jLabel2))

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)

.addComponent(password, javax.swing.GroupLayout.DEFAULT_SIZE, 121, Short.MAX_VALUE)

.addComponent(username))

.addGap(0, 0, Short.MAX_VALUE))

);

jPanel2Layout.setVerticalGroup(

jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel2Layout.createSequentialGroup()

.addGap(45, 45, 45)

.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jLabel2)

.addComponent(username, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(30, 30, 30)

.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jLabel3)

.addComponent(password, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

);

jPanel3.setPreferredSize(new java.awt.Dimension(280, 50));

btn_login.setText("登陆");

btn_login.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

btn_loginActionPerformed(evt);

}

});

btn_reset.setText("重置");

btn_reset.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

btn_resetActionPerformed(evt);

}

});

javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);

jPanel3.setLayout(jPanel3Layout);

jPanel3Layout.setHorizontalGroup(

jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel3Layout.createSequentialGroup()

.addGap(52, 52, 52)

.addComponent(btn_login)

.addGap(28, 28, 28)

.addComponent(btn_reset)

.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

);

jPanel3Layout.setVerticalGroup(

jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel3Layout.createSequentialGroup()

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(btn_login)

.addComponent(btn_reset))

.addGap(0, 28, Short.MAX_VALUE))

);

javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);

jPanel1.setLayout(jPanel1Layout);

jPanel1Layout.setHorizontalGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)

.addGroup(jPanel1Layout.createSequentialGroup()

.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 270, javax.swing.Group
4000
Layout.PREFERRED_SIZE)

.addGap(0, 9, Short.MAX_VALUE))

);

jPanel1Layout.setVerticalGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel1Layout.createSequentialGroup()

.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 152, javax.swing.GroupLayout.PREFERRED_SIZE)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)

.addContainerGap())

);

getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

pack();

}// </editor-fold>

private void usernameActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

}

private void btn_loginActionPerformed(java.awt.event.ActionEvent evt) {

String user_name = username.getText().trim();

String pass_word = new String(password.getPassword());

if (user_name.length() == 0) {

JOptionPane.showMessageDialog(null, "用户名不能为空！");

return;

}

if (pass_word.length() == 0) {

JOptionPane.showMessageDialog(null, "用户名不能为空！");

return;

}

boolean a = true;

while (a) {



Login ln = getLogins(user_name);

if (ln == null) {

System.out.println("请输入正确的信息");

JOptionPane.showMessageDialog(null, "用户名不存在");

username.setText("");

password.setText("");

return;

}

String zh = ln.getLogin_name();

String ps = ln.getPass_word();

if (zh.equals(user_name) && ps.equals(pass_word)) {

Library libraryFrame = new Library();

libraryFrame.setVisible(true);

this.setVisible(false);

a = false;

} else {

JOptionPane.showMessageDialog(null, "你的密码错误！");

username.setText("");

password.setText("");

return;

}

}

}

private void btn_resetActionPerformed(java.awt.event.ActionEvent evt) {

username.setText("");

password.setText("");

}

public static Login getLogins(String name) {

// List<Login> logins = new ArrayList<>();

Login login = null;

String sql = "select * from yonghu where user_name='" + name + "'";

try (Connection con = JDBC.getConnection();

Statement stmt = con.createStatement();

ResultSet rs = stmt.executeQuery(sql);) {

while (rs.next()) {

login = new Login();

login.setLogin_name(rs.getString("user_name"));

login.setPass_word(rs.getString("pass_word"));

// String loginname = rs.getString("loginname");

// String loginpassword = rs.getString("loginpassword");

// login.add(login);

}

} catch (SQLException ex) {

ex.printStackTrace();

}

return login;

}

public static void main(String args[]) {

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new LoginFrame().setVisible(true);

}

});

}

// Variables declaration - do not modify

private javax.swing.JButton btn_login;

private javax.swing.JButton btn_reset;

private javax.swing.JLabel jLabel1;

private javax.swing.JLabel jLabel2;

private javax.swing.JLabel jLabel3;

private javax.swing.JPanel jPanel1;

private javax.swing.JPanel jPanel2;

private javax.swing.JPanel jPanel3;

private javax.swing.JPasswordField password;

private javax.swing.JTextField username;

// End of variables declaration

private String getPass_word() {

throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.

}

}

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