我用 Java 创建了一个简单的登录表单，用于连接到 mysql 数据库。它适用于 Jframe 表单。但是，当我将文件插入代号一个应用程序时，它不接受 Jdbc 连接。应该选择什么？ 我能否将 Jdbc 更改为另一种方法，以便执行查询，并在我插入正确的凭据后连接到代号一个应用程序，就像它在这里的工作方式一样？
我的代码:
登录表单.java
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package packagelogin2;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.Timer;
/**
*
* @author ksak
*/
public class Java_Form_Login extends javax.swing.JFrame {
/**
* Creates new form Javaloginform
*/
public Java_Form_Login() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
Timer timer1 = new Timer(30, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(jPanel_Message.getHeight() != 105 )
{
jPanel_Message.setBounds(0,0,Java_Form_Login.this.getSize().width,jPanel_Message.getHeight() + 5);
if(jPanel_Message.getHeight() == 105){
timer1.stop();
}
}
}
});
Timer timer2 = new Timer(30, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(jPanel_Message.getHeight() != 0 )
{
jPanel_Message.setBounds(0,0,Java_Form_Login.this.getSize().width,jPanel_Message.getHeight() - 5);
if(jPanel_Message.getHeight() == 105){
timer2.stop();
}
}
}
});
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
Username = new javax.swing.JLabel();
Password = new javax.swing.JLabel();
jTextField_Username = new javax.swing.JTextField();
jPasswordField_Password = new javax.swing.JPasswordField();
jCheckBox1 = new javax.swing.JCheckBox();
jButton_Login = new javax.swing.JButton();
jPanel_Message = new javax.swing.JPanel();
jLabel_Message = new javax.swing.JLabel();
jButton_Ok = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBackground(java.awt.Color.decode("#bdb76b"));
Username.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
Username.setText("Username :");
Password.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
Password.setText("Password:");
jTextField_Username.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jTextField_Username.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField_UsernameActionPerformed(evt);
}
});
jPasswordField_Password.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jPasswordField_PasswordActionPerformed(evt);
}
});
jCheckBox1.setText("Show Password");
jCheckBox1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jCheckBox1ActionPerformed(evt);
}
});
jButton_Login.setText("Login");
jButton_Login.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton_LoginActionPerformed(evt);
}
});
jPanel_Message.setBackground(java.awt.Color.decode("#3a7595"));
jLabel_Message.setText("Message: ");
jButton_Ok.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
jButton_Ok.setText("Ok");
jButton_Ok.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton_OkActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel_MessageLayout = new javax.swing.GroupLayout(jPanel_Message);
jPanel_Message.setLayout(jPanel_MessageLayout);
jPanel_MessageLayout.setHorizontalGroup(
jPanel_MessageLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel_MessageLayout.createSequentialGroup()
.addGap(40, 40, 40)
.addComponent(jLabel_Message)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 308, Short.MAX_VALUE)
.addComponent(jButton_Ok, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(98, 98, 98))
);
jPanel_MessageLayout.setVerticalGroup(
jPanel_MessageLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel_MessageLayout.createSequentialGroup()
.addGap(41, 41, 41)
.addComponent(jLabel_Message)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel_MessageLayout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton_Ok, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(28, 28, 28)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(Password, javax.swing.GroupLayout.PREFERRED_SIZE, 78, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(Username, javax.swing.GroupLayout.PREFERRED_SIZE, 86, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jTextField_Username, javax.swing.GroupLayout.PREFERRED_SIZE, 133, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton_Login, javax.swing.GroupLayout.PREFERRED_SIZE, 113, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(62, 62, 62))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jPasswordField_Password, javax.swing.GroupLayout.PREFERRED_SIZE, 133, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(30, 30, 30)
.addComponent(jCheckBox1)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel_Message, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(27, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addComponent(jPanel_Message, javax.swing.GroupLayout.PREFERRED_SIZE, 6, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 175, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(Username)
.addComponent(jTextField_Username, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(53, 53, 53))
.addComponent(jButton_Login, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 66, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(8, 8, 8)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(Password)
.addComponent(jPasswordField_Password, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jCheckBox1))
.addGap(81, 81, 81))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 30, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jTextField_UsernameActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jPasswordField_PasswordActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jButton_LoginActionPerformed(java.awt.event.ActionEvent evt) {
Connection connection;
PreparedStatement ps;
try {
connection = DriverManager.getConnection("jdbc:mysql://1.2.3.4/admin_1?useLegacyDatetimeCode=false&serverTimezone=UTC","user1","password1");
ps = connection.prepareStatement("SELECT `username`, `password` FROM `table1` WHERE `username` = ? AND `password` = ?");
ps.setString(1, jTextField_Username.getText());
ps.setString(2, String.valueOf(jPasswordField_Password.getPassword()));
ResultSet result = ps.executeQuery();
if(result.next()){
jLabel_Message.setText("Login Successful");
jLabel_Message.setForeground(Color.GREEN);
timer1.start();
}
else{
jLabel_Message.setText("Invalid Username Or Password");
jLabel_Message.setForeground(Color.RED);
timer1.start();
}
} catch (SQLException ex) {
Logger.getLogger(Java_Form_Login.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void jCheckBox1ActionPerformed(java.awt.event.ActionEvent evt) {
if(jCheckBox1.isSelected()){
jPasswordField_Password.setEchoChar((char)0);
}else{
jPasswordField_Password.setEchoChar('*');
}
}
private void jButton_OkActionPerformed(java.awt.event.ActionEvent evt) {
timer2.start();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Java_Form_Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Java_Form_Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Java_Form_Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Java_Form_Login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Java_Form_Login().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel Password;
private javax.swing.JLabel Username;
private javax.swing.JButton jButton_Login;
private javax.swing.JButton jButton_Ok;
private javax.swing.JCheckBox jCheckBox1;
private javax.swing.JLabel jLabel_Message;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel_Message;
private javax.swing.JPasswordField jPasswordField_Password;
private javax.swing.JTextField jTextField_Username;
// End of variables declaration
}
它作为一个单独的类工作。但是，我把包放在codename one之后，报错:
ΜΜ packagelogin2.Java_Form_Login jButton_LoginActionPerformed
SEVERE: null
java.sql.SQLException: invalid database address: jdbc:mysql://1.2.3.4?useLegacyDatetimeCode=false&serverTimezone=UTC
at org.sqlite.JDBC.createConnection(JDBC.java:110)
at org.sqlite.JDBC.connect(JDBC.java:87)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at packagelogin2.Java_Form_Login.jButton_LoginActionPerformed(Java_Form_Login.java:248)
at packagelogin2.Java_Form_Login.access$400(Java_Form_Login.java:24)
at packagelogin2.Java_Form_Login$6.actionPerformed(Java_Form_Login.java:131)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2237)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2295)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467)
at java.awt.Container.dispatchEventImpl(Container.java:2281)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Ιουν 20, 2018 3:03:42 ΜΜ packagelogin2.Java_Form_Login jButton_LoginActionPerformed
SEVERE: null
java.sql.SQLException: invalid database address: jdbc:mysql://62.210.149.54/admin_akmi17?useLegacyDatetimeCode=false&serverTimezone=UTC
at org.sqlite.JDBC.createConnection(JDBC.java:110)
at org.sqlite.JDBC.connect(JDBC.java:87)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at packagelogin2.Java_Form_Login.jButton_LoginActionPerformed(Java_Form_Login.java:248)
at packagelogin2.Java_Form_Login.access$400(Java_Form_Login.java:24)
at packagelogin2.Java_Form_Login$6.actionPerformed(Java_Form_Login.java:131)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2237)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2295)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467)
at java.awt.Container.dispatchEventImpl(Container.java:2281)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
最佳答案
代号一不支持这些 API，这是有充分理由的。您无法从移动设备连接到服务器上的 SQL 数据库。这将破坏安全性、性能和可靠性。
进一步阅读:
关于java - JDBC 连接到 MYSQL 不使用代号一，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50949345/