mdiuser.java

简易图书馆管理系统

import java.util.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.sql.*;
import java.awt.event.*;
import javax.swing.*;
 class Mdiuser extends Dialog  implements ActionListener
 {
	JLabel l_addname,l_fenge,l_name,l_pass,l_enter,l_unit;
	JTextField t_mname;
	Choice c_munit;
	JPasswordField t_mpass,t_menter;
	JButton b_mdiname,b_cancle;
	JPanel pan1,pan2,pan3,pan4,pan5,pan6,pan7;
	
	NetConn sql;
	Statement sqll;
	ResultSet rs;
	String a1,a2,a3,a4,a5;
	
	Mdiuser(Frame f,String s)
	{
		super(f,s);
		l_addname=new JLabel("修改用户信息        ");
		l_fenge=new JLabel("------------------------------------------");
		l_name=new JLabel("名字：");
		l_pass=new JLabel("原密：");
		l_enter=new JLabel("新密：");
		l_unit=new JLabel("权限：");
		t_mname=new JTextField("",10);
		t_mpass=new JPasswordField("",10);
		t_menter=new JPasswordField("",10);
		t_menter.setEchoChar('*');
		c_munit=new Choice();
		c_munit.add("1");
		c_munit.add("2");
		c_munit.add("3");
		b_mdiname=new JButton("修改");
		b_mdiname.addActionListener(this);
		b_cancle=new JButton("放弃");
		b_cancle.addActionListener(this);
		pan1=new JPanel();
		pan2=new JPanel();
		pan3=new JPanel();
		pan4=new JPanel();
		pan5=new JPanel();
		pan6=new JPanel();
		pan7=new JPanel();
		pan1.add(l_addname);pan2.add(l_fenge);
		pan2.add(l_name);pan2.add(t_mname);
		pan3.add(l_pass);pan3.add(t_mpass);
		pan4.add(l_enter);pan4.add(t_menter);
		pan5.add(b_mdiname);pan5.add(b_cancle);
		pan6.add(l_fenge);
		pan7.add(l_unit);pan7.add(c_munit);
		
		sql=new NetConn();
		
		setLayout(new GridLayout(7,1));
		add(pan1);add(pan6);add(pan2);add(pan3);add(pan4);add(pan7);add(pan5);
		setBounds(450,150,250,300);
		
	}
	public void actionPerformed(ActionEvent e)
	{
	    if(e.getSource()==b_cancle)
		{
			dispose();
		}
	    else if(e.getSource()==b_mdiname)
	    {
	    	
	    	try
		       {
		          sqll=sql.connect();
		    	  rs=sqll.executeQuery("SELECT * FROM users where username="+"'"+t_mname.getText()+"'");
			      while(rs.next())
			       {
			        	a2=rs.getString(2);
			        	if(t_mpass.getText().equals(a2))
				        {
			        	     a3="'"+t_mname.getText().trim()+"'";
							 a4="'"+t_menter.getText().trim()+"'";
							 a5="'"+c_munit.getSelectedItem().trim()+"'";
							 String tem="UPDATE users SET password="+a4+",unit="+a5+" WHERE username="+a3;
							 sqll.executeUpdate(tem);
							 l_addname.setText("用户修改成功");
					
				        }
				       else
				        {
					        l_addname.setText("用户名或密码错误！");
				        }
			       }
			
		        }
		       catch(SQLException e2)
		        {}
		       
	    }
	}
	
 }