java用户名和密码怎么写代码

java怎么写登入代码

1.用java写一个登录界面的代码,哪位大神会啊,谢谢

import java.awt.Dimension; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPasswordField; import javax.swing.JTextField; public class Test26 { public static void main(String[] args) { final String userName = "abc"; final String passwrod = "123"; JFrame jFrame = new JFrame（"登陆界面"）； Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize(); jFrame.setBounds(((int)dimension.getWidth() - 200) / 2, ((int)dimension.getHeight() - 300) / 2, 200, 150); jFrame.setResizable(false); jFrame.setLayout(null); jFrame.(JFrame.EXIT_ON_CLOSE); JLabel label1 = new JLabel（"姓名"）； label1.setBounds(10, 10, 100, 30); jFrame.add(label1); JLabel label2 = new JLabel（"密码"）； label2.setBounds(10, 40, 100, 30); jFrame.add(label2); final JTextField text1 = new JTextField(); text1.setBounds(50, 15, 130, 20); jFrame.add(text1); final JPasswordField text2 = new JPasswordField(); text2.setBounds(50, 45, 130, 20); jFrame.add(text2); JButton button = new JButton("Login"); button.setBounds(10, 75, 170, 40); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if(userName.equals(text1.getText()) && passwrod.equals(text2.getText())) { JOptionPane.showMessageDialog(null， "登陆成功误"， "提示"， JOptionPane.INFORMATION_MESSAGE); } else { JOptionPane.showMessageDialog(null， "错误"， "提示"， JOptionPane.ERROR_MESSAGE); text1.setText(""); text2.setText(""); } } }); jFrame.add(button); jFrame.setVisible(true)； } }我有一个微信公众号，经常会分享一些Java技术相关的干货，还有一些学习资源。

如果你喜欢我的分享，可以用微信搜索“Java团长”或者“javatuanzhang”关注。

2.怎么用JAVA写一个用户登入程序

同意楼上的说法，具体点可以这样：创建一个用户表，里边包括LoginName（登录名），UserName（用户名），Password（密码），Age（年龄），Address（地址）。

然后编写Java程序（用MVC架构）模型层（M）:DBConnection.java（负责连接数据库）import java.sql.Connection;import java.sql.DriverManager;import java.sql.*;public class DBConnection { private static final String DRIVER_CLASS = "sun.jdbc.odbc.JdbcOdbcDriver"; private static final String DB_URL = "jdbc:odbc:text"; public DBConnection() { } public static Connection getConnection() { Connection conn = null; try { Class.forName(DRIVER_CLASS); conn = DriverManager.getConnection(DB_URL); } catch (SQLException ex) { System.out.println(ex.getMessage()); } catch ( ex) { System.out.println(ex.getMessage()); } return conn； }}第2个负责数据库查询操作的类：DBUserManager.javaimport edu.systop.text.model.entity.User;import edu.systop.text.model.dao.DBConnection;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.DriverManager;import java.sql.*;public class DBUserManager { private static final String SQL_SELECT = "SELECT LoginName,UserName,PassWord,Age,Address FROM UserInfo WHERE LoginName = ? AND PassWord = ?"; public DBUserManager() { } public boolean checkDB(User u) { boolean b = false; Connection conn = null; PreparedStatement psmt = null; ResultSet rs = null; conn = DBConnection.getConnection(); try { psmt = conn.prepareStatement(SQL_SELECT); psmt.setString(1, u.getLoginName()); psmt.setString(2, u.getPassWord()); rs = psmt.executeQuery(); b = rs.next(); if (rs.next()) { b = true; } } catch (SQLException ex) { System.out.println(ex.getMessage()); } finally { cleanDB(rs, psmt, conn); } return b; } public User checkBC(User u) { Connection conn = null; PreparedStatement psmt = null; ResultSet rs = null; User tmp = new User(); conn = DBConnection.getConnection(); try { psmt = conn.prepareStatement(SQL_SELECT); psmt.setString(1, u.getLoginName()); psmt.setString(2, u.getPassWord()); rs = psmt.executeQuery(); if (rs.next()) { tmp.setLoginName(rs.getString(1)); tmp.setUserName(rs.getString(2)); tmp.setAge(rs.getInt(4)); tmp.setAddress(rs.getString(5)); } } catch (SQLException ex) { System.out.println(ex.getMessage()); } finally { cleanDB(rs, psmt, conn); } return tmp; } public void cleanDB(ResultSet rs, PreparedStatement psmt, Connection conn) { try { if (rs != null) { rs.close(); } if (psmt != null) { psmt.close(); } if (conn != null) { conn.close(); } } catch (SQLException ex) { System.out.println(ex.getMessage（)）； } }第3个实体用户类：User.javapackage edu.systop.text.model.entity;public class User { private String loginName; private String userName; private String passWord; private int age; private String address; public User() { } public void setLoginName(String loginName) { this.loginName = loginName; } public void setUserName(String userName) { this.userName = userName; } public void setPassWord(String passWord) { this.passWord = passWord; } public void setAge(int age) { this.age = age; } public void setAddress(String address) { this.address = address; } public String getLoginName() { return loginName; } public String getUserName() { return userName; } public String getPassWord() { return passWord; } public int getAge() { return age; } public String getAddress() { return address； }}然后编写控制层（C）:GetInfoServlet.javapackage edu.systop.text.control;import javax.servlet.*;import javax.servlet.; charset=GBK"; //Initialize global variables public void init() throws ServletException { } //Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } //Process the HTTP Post request public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String loginName = request.getParameter("loginName"); String passWord = request.getParameter("passWord"); User u = new User(); u.setLoginName(loginName); u.setPassWord(passWord); UserManager m = new UserManager();RequestDispatcher d; if (m.checkUser(u)) { User o = m.checkBC(u); request.setAttribute("JavaBEAN",o); d = request.getRequestDispatcher("GetInfoUser.jsp"); } else { d = request。.。

3.JAVA中登录窗口设计,源代码该怎么写

import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Test_Login extends javax.swing.JFrame {private JPanel jPanel1;private JButton bntLogin;private JButton bntCannel;private JPasswordField pwd;private JTextField username;private JLabel jLabel2;private JLabel jLabel1;public static void main(String[] args) { Test_Login inst = new Test_Login(); inst.setLocationRelativeTo(null); inst.setVisible(true);}public Test_Login() { super(); initGUI();}private void initGUI() { try { (WindowConstants.DISPOSE_ON_CLOSE); { jPanel1 = new JPanel(); getContentPane().add(jPanel1, BorderLayout.CENTER); jPanel1.setLayout(null); { jLabel1 = new JLabel(); jPanel1.add(jLabel1); jLabel1.setText（"用户名"）； jLabel1.setBounds(45, 30, 75, 25); } { jLabel2 = new JLabel(); jPanel1.add(jLabel2); jLabel2.setText（"密码"）； jLabel2.setBounds(45, 75, 55, 15); } { username = new JTextField(); jPanel1.add(username); username.setBounds(100, 30, 140, 25); } { pwd = new JPasswordField(); jPanel1.add(pwd); pwd.setBounds(100, 70, 140, 25); } { bntLogin = new JButton(); jPanel1.add(bntLogin); bntLogin.setText（"登陆"）； bntLogin.setBounds(40, 120, 60, 30); bntLogin.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { if (username.getText().equals("lisong") && pwd.getText().equals("lisong")) { JOptionPane.showMessageDialog(Test_Login.this， "登录成功")； } else { JOptionPane.showMessageDialog(Test_Login.this， "登录失败")； } } }）； bntCannel = new JButton(); jPanel1.add(bntCannel); bntCannel.setText（"取消"）； bntCannel.setBounds(180, 120, 60, 30); bntCannel.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { System.exit(0); } }); } } pack(); setSize(300, 215); } catch (Exception e) { e.printStackTrace(); }}}。

4.谁能写出JAVA中用户登陆的代码

import java.awt.*; import javax.swing.*; import java.awt.Rectangle; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import db.DBAccess; import java.sql.ResultSet; import java.sql.*; public class login extends JFrame { DBAccess da=new DBAccess(); public login() { try { jbInit(); } catch (Exception exception) { exception.printStackTrace(); } } private void jbInit() throws Exception { getContentPane().setLayout(null); jLabel3.setText（"用户名"）； jLabel3.setBounds(new Rectangle(50, 67, 89, 40)); uname.setBounds(new Rectangle(176, 67, 106, 37)); upwsd.setBounds(new Rectangle(170, 119, 106, 37)); jToggleButton1.setText（"取消"）； jToggleButton1.setBounds(new Rectangle(184, 214, 96, 32)); jToggleButton1.addActionListener(new login_jToggleButton1_actionAdapter(this)); jToggleButton2.setText（"登陆"）； jToggleButton2.setBounds(new Rectangle(39, 214, 96, 32)); jToggleButton2.addActionListener(new login_jToggleButton2_actionAdapter(this)); this.getContentPane().add(uname); this.getContentPane().add(upwsd); this.getContentPane().add(jToggleButton1); this.getContentPane().add(jToggleButton2); this.getContentPane().add(jLabel3); this.getContentPane().add(jLabel2); jLabel2.setText（"密码"）； jLabel2.setBounds(new Rectangle(47, 116, 89, 40)); } JLabel jLabel2 = new JLabel(); JLabel jLabel3 = new JLabel(); JTextField uname = new JTextField(); JTextField upwsd = new JTextField(); JToggleButton jToggleButton1 = new JToggleButton(); JToggleButton jToggleButton2 = new JToggleButton(); public void jToggleButton1_actionPerformed(ActionEvent e) { this.dispose(); } public void jToggleButton2_actionPerformed(ActionEvent e) { String name=uname.getText(); String pwsd=upwsd.getText(); try { ResultSet rs = da.getResultSet("select * from login where name='" + name + "' and pwsd='" + pwsd + "'"); if(rs.next()) { JOptionPane.showConfirmDialog(this，"登陆成功")； } else { JOptionPane.showConfirmDialog(this，"登陆失败")； } } catch (SQLException ex) { ex.printStackTrace(); } } } class login_jToggleButton2_actionAdapter implements ActionListener { private login adaptee; login_jToggleButton2_actionAdapter(login adaptee) { this.adaptee = adaptee; } public void actionPerformed(ActionEvent e) { adaptee.jToggleButton2_actionPerformed(e); } } class login_jToggleButton1_actionAdapter implements ActionListener { private login adaptee; login_jToggleButton1_actionAdapter(login adaptee) { this.adaptee = adaptee; } public void actionPerformed(ActionEvent e) { adaptee.jToggleButton1_actionPerformed(e); } }。

5.怎么用JAVA写一个用户登入程序

同意楼上的说法，具体点可以这样：创建一个用户表，里边包括LoginName（登录名），UserName（用户名），Password（密码），Age（年龄），Address（地址）。

然后编写Java程序（用MVC架构）模型层（M）:DBConnection.java（负责连接数据库）import java.sql.Connection;import java.sql.DriverManager;import java.sql.*;public class DBConnection { private static final String DRIVER_CLASS = "sun.jdbc.odbc.JdbcOdbcDriver"; private static final String DB_URL = "jdbc:odbc:text"; public DBConnection() { } public static Connection getConnection() { Connection conn = null; try { Class.forName(DRIVER_CLASS); conn = DriverManager.getConnection(DB_URL); } catch (SQLException ex) { System.out.println(ex.getMessage()); } catch ( ex) { System.out.println(ex.getMessage()); } return conn； }}第2个负责数据库查询操作的类：DBUserManager.javaimport edu.systop.text.model.entity.User;import edu.systop.text.model.dao.DBConnection;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.DriverManager;import java.sql.*;public class DBUserManager { private static final String SQL_SELECT = "SELECT LoginName,UserName,PassWord,Age,Address FROM UserInfo WHERE LoginName = ? AND PassWord = ?"; public DBUserManager() { } public boolean checkDB(User u) { boolean b = false; Connection conn = null; PreparedStatement psmt = null; ResultSet rs = null; conn = DBConnection.getConnection(); try { psmt = conn.prepareStatement(SQL_SELECT); psmt.setString(1, u.getLoginName()); psmt.setString(2, u.getPassWord()); rs = psmt.executeQuery(); b = rs.next(); if (rs.next()) { b = true; } } catch (SQLException ex) { System.out.println(ex.getMessage()); } finally { cleanDB(rs, psmt, conn); } return b; } public User checkBC(User u) { Connection conn = null; PreparedStatement psmt = null; ResultSet rs = null; User tmp = new User(); conn = DBConnection.getConnection(); try { psmt = conn.prepareStatement(SQL_SELECT); psmt.setString(1, u.getLoginName()); psmt.setString(2, u.getPassWord()); rs = psmt.executeQuery(); if (rs.next()) { tmp.setLoginName(rs.getString(1)); tmp.setUserName(rs.getString(2)); tmp.setAge(rs.getInt(4)); tmp.setAddress(rs.getString(5)); } } catch (SQLException ex) { System.out.println(ex.getMessage()); } finally { cleanDB(rs, psmt, conn); } return tmp; } public void cleanDB(ResultSet rs, PreparedStatement psmt, Connection conn) { try { if (rs != null) { rs.close(); } if (psmt != null) { psmt.close(); } if (conn != null) { conn.close(); } } catch (SQLException ex) { System.out.println(ex.getMessage（)）； } }第3个实体用户类：User.javapackage edu.systop.text.model.entity;public class User { private String loginName; private String userName; private String passWord; private int age; private String address; public User() { } public void setLoginName(String loginName) { this.loginName = loginName; } public void setUserName(String userName) { this.userName = userName; } public void setPassWord(String passWord) { this.passWord = passWord; } public void setAge(int age) { this.age = age; } public void setAddress(String address) { this.address = address; } public String getLoginName() { return loginName; } public String getUserName() { return userName; } public String getPassWord() { return passWord; } public int getAge() { return age; } public String getAddress() { return address； }}然后编写控制层（C）:GetInfoServlet.javapackage edu.systop.text.control;import javax.servlet.*;import javax.servlet.; charset=gbk"; //Initialize global variables public void init() throws ServletException { } //Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } //Process the HTTP Post request public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String loginName = request.getParameter("loginName"); String passWord = request.getParameter("passWord"); User u = new User(); u.setLoginName(loginName); u.setPassWord(pa。

java怎么写登入代码