这段代码与使用mysql table中的java更改用户密码相关。这段代码没有错误但是在这个程序中有一个逻辑错误，它在sql语句中抛出异常因为我不知道哪个查询用于更新用户密码请帮助我，并在我的电子邮件请求发送解决方案！ khanusama111@gmail.com这是我的电子邮件ID。
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.sql.*;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
public class ChangePassword extends JDialog implements ActionListener
{
JLabel userlbl,oldpasslbl,repasslbl,npasslbl,imglbl;
JTextField usernametxt;
JPasswordField oldpasstxt,repasstxt,npasstxt;
JButton changebtn;
public ChangePassword()throws ClassNotFoundException, SQLException, IOException
{
setVisible(true);
setTitle("Change Password");
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
setBounds(300,300,600,300);
setLayout(null);
Font f = new Font("Microsoft New Tai Lue",Font.PLAIN,12);
Font f1 = new Font("Microsoft New Tai Lue",Font.PLAIN,14);
Font f2 = new Font("Microsoft New Tai Lue",Font.BOLD,18);
ImageIcon ICON = new ImageIcon("C:\\Users\\khan\\Desktop\\splash scren\\man.png");
imglbl = new JLabel(ICON);
userlbl = new JLabel("Enter Username :");
userlbl.setFont(f);
oldpasslbl = new JLabel("Current Password :");
oldpasslbl.setFont(f);
npasslbl = new JLabel("New Password :");
npasslbl.setFont(f);
repasslbl = new JLabel("Re-Password :");
repasslbl.setFont(f);
usernametxt = new JTextField();
usernametxt.setFont(f1);
oldpasstxt = new JPasswordField();
oldpasstxt.setFont(f2);
npasstxt = new JPasswordField();
npasstxt.setFont(f2);
repasstxt = new JPasswordField();
repasstxt.setFont(f2);
changebtn = new JButton("Change");
imglbl.setBounds(400, 30, 160, 130);
userlbl.setBounds(10, 30, 120, 20);
usernametxt.setBounds(180, 30, 200, 25);
oldpasslbl.setBounds(10, 60,120, 20);
oldpasstxt.setBounds(180, 60, 200, 25);
npasslbl.setBounds(10, 90, 120, 25);
npasstxt.setBounds(180, 90, 200, 25);
repasslbl.setBounds(10, 120, 120, 25);
repasstxt.setBounds(180, 120, 200, 25);
changebtn.setBounds(180, 160, 120, 30);
add(imglbl);
add(userlbl);
add(usernametxt);
add(oldpasslbl);
add(oldpasstxt);
add(npasslbl);
add(npasstxt);
add(repasslbl);
add(repasstxt);
add(changebtn);
changebtn.addActionListener(this);
}
public static void main(String args[])
{
try
{
new ChangePassword();
}
catch (ClassNotFoundException | SQLException | IOException e)
{
e.printStackTrace();
}
}
public void actionPerformed(ActionEvent a)
{
if(a.getSource().equals(changebtn))
{
int x = 0;
String cuser1 = usernametxt.getText();
String old = oldpasstxt.getText();
String npassword = npasstxt.getText();
String repassword = repasstxt.getText();
try
{
Connection con=null;
con = CreateConnection.connectMe();
if(cuser1.equals("") && old.equals("") && npassword.equals(""))
{
JOptionPane.showMessageDialog(this, "PLEASE ENTER ALL INFORMATION");
}
else
{
if(vali(cuser1,old))
{
if(npassword.equals(old))
{
JOptionPane.showMessageDialog(this, "PASSWORD IS ALL REDY EXIST PLEASE CHOOSE OTHER PASSWORD");
}
else
{
if(npassword.equals(repassword))
{
con = CreateConnection.connectMe();
PreparedStatement st;
st = con.prepareStatement("UPDATE createaccount SET password= '+npassword+' where cuser = 'cuser1'");
// st.setString(1, cuser);
st.setString(1, npassword);
st.executeUpdate();
JOptionPane.showMessageDialog(this, "PASSWORD UPDATE SUCCESSFUL");
}
else
{
JOptionPane.showMessageDialog(this, "PASSWORD NOT MATCH");
repasstxt.setText(null);
}
}
}
else
{
JOptionPane.showMessageDialog(this, "USERNAME NOT FOUND");
}
}
}
catch(ClassNotFoundException e)
{
JOptionPane.showMessageDialog(this, "Connection class is not found");
}
catch (SQLException e)
{
JOptionPane.showMessageDialog(this, "Query Not Executed");
}
catch (IOException e)
{
JOptionPane.showMessageDialog(this, "Input/Output Error");
}
}
}
public boolean vali(String cuser, String password)
{
boolean result = false;
Connection con;
try
{
con = CreateConnection.connectMe();
PreparedStatement st;
st = con.prepareStatement("select * from createaccount where cuser = ? AND password = ?");
st.setString(1, cuser);
st.setString(2, password);
ResultSet rs = st.executeQuery();
if(rs.next())
{
result = true;
}
else
{
result = false;
}
}
catch(ClassNotFoundException e)
{
JOptionPane.showMessageDialog(this, "Connection class is not found");
}
catch (SQLException e)
{
JOptionPane.showMessageDialog(this, "Query Not Executed");
}
catch (IOException e)
{![output of this code][1]
JOptionPane.showMessageDialog(this, "Input/Output Error");
}
return result;
}
答案 0 :(得分：1)
您的代码是对的，错误在您的查询中。试试这个：
if(ae.getSource().equals(deletebtn))
{
int x = 0;
String cuser,answer,question1,password;
cuser = cusertxt.getText();
password = passtxt.getText();
answer = anstxt.getText();
question1 = securitycb.getSelectedItem().toString();
if(cusertxt.getText().isEmpty())
{
JOptionPane.showMessageDialog(null, "Please Enter Username");
}
else if(passtxt.getText().isEmpty())
{
JOptionPane.showMessageDialog(null, "Please Enter Password");
}
else if(securitycb.getSelectedItem().equals("---------------------------Questions----------------------------"))
{
JOptionPane.showMessageDialog(null, "Please Choose Security Questions");
}
else if(anstxt.getText().isEmpty())
{
JOptionPane.showMessageDialog(null, "Please enter your answer");
}
else
{
int dialogButton = JOptionPane.YES_NO_OPTION;
int dialogResult = JOptionPane.showConfirmDialog(null, "Are you sure to delete your account", "Delete Account",dialogButton);
if(dialogResult == JOptionPane.YES_OPTION)
{
Connection con = null;
try
{
con = CreateConnection.connectMe();
PreparedStatement st=null;
st = con.prepareStatement("delete from createaccount where cuser = ? AND password = ? AND question = ? AND ans = ?");
st.setString(1, cuser);
st.setString(2, password);
st.setString(3, question1);
st.setString(4, answer);
int m = st.executeUpdate();
if (m==1)
{
JOptionPane.showMessageDialog(null, " Successfully deleted");
dispose();
new LoginForm();
//System.exit(0);
}
else
{
JOptionPane.showMessageDialog(null, "Sorry! This Username is dosen't exist ");
}
}
catch (ClassNotFoundException ce)
{
}
catch(SQLException s)
{
JOptionPane.showMessageDialog(null, "query not executed");
}
catch(IOException e)
{
}
}
else
{
setVisible(false);
}
}
}
答案 1 :(得分：0)
更改并输入此代码
if(a.getSource().equals(changebtn))
{
int x = 0;
String cuser1 = usernametxt.getText();
String old = oldpasstxt.getText();
String npassword = npasstxt.getText();
String repassword = repasstxt.getText();
try
{
Connection con=null;
con = CreateConnection.connectMe();
if(cuser1.equals("") || old.equals("") || npassword.equals("") || repassword.equals(""))
{
JOptionPane.showMessageDialog(null, "PLEASE ENTER ALL INFORMATION");
}
else
{
if(vali(cuser1,old))
{
if(npassword.equals(old))
{
JOptionPane.showMessageDialog(null, "PASSWORD IS ALL REDY EXIST PLEASE CHOOSE OTHER PASSWORD");
}
else
{
if(npassword.equals(repassword))
{
con = CreateConnection.connectMe();
PreparedStatement st;
st = con.prepareStatement("UPDATE createaccount SET password = ? where cuser = ?");
st.setString(1, npassword);
st.setString(2, cuser1);
st.executeUpdate();
JOptionPane.showMessageDialog(null, "PASSWORD UPDATE SUCCESSFUL");
repasstxt.setText(null);
npasstxt.setText(null);
usernametxt.setText(null);
oldpasstxt.setText(null);
setVisible(false);
}
else
{
JOptionPane.showMessageDialog(null, "PASSWORD NOT MATCH");
repasstxt.setText(null);
npasstxt.setText(null);
}
}
}
else
{
JOptionPane.showMessageDialog(null, "USERNAME NOT FOUND");
repasstxt.setText(null);
npasstxt.setText(null);
usernametxt.setText(null);
oldpasstxt.setText(null);
}
}
}
catch(ClassNotFoundException e)
{
JOptionPane.showMessageDialog(null, "Connection class is not found");
}
catch (SQLException e)
{
JOptionPane.showMessageDialog(null, "Query Not Executed");
}
catch (IOException e)
{
JOptionPane.showMessageDialog(null, "Input/Output Error");
}
}
}
};