一、登录页面主要代码：login.jsp <%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>       
    
 		
     
 		        
       
 			        
用户：
 			        
 		         
 		         
 			        
密码：
 			        
 
 		         
 		         
 			        
 
 			        
 			   			   			
 		         
 		      
     
 	
    
    二、对用户登录进行的操作类：loginDao.java package com.login; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import com.db.dbpool;  //数据库连接包 public class loginDao {     //对用户登录进行的操作类 	Connection myCon=null; 	PreparedStatement pst=null; 	ResultSet rs=null; 	//管理员登录验证方法 	public boolean CheckLogin(String username,String userpass) 	{
  		boolean bool=false; 		dbpool pool=new dbpool();  //实例化数据库连接 		myCon=pool.getConnection(); //调用连接方法 		String sql="select * from td_user where uname='"+username+"' and upass='"+userpass+"'";; 		try {
  			pst=myCon.prepareStatement(sql); 			rs=pst.executeQuery(); 			if(rs.next()) 			{
  				bool=true; 			} 		} catch (SQLException e) {
  			// TODO Auto-generated catch block 			e.printStackTrace(); 		} 		return bool; 	} } 三、登录的servlet主要代码：LoginServlet.java package com.servlet; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.login.loginDao;  //对登录验证操作的类 public class LoginServlet extends HttpServlet {
  	public void doGet(HttpServletRequest request, HttpServletResponse response) 			throws ServletException, IOException {
  		//管理员登录验证 		request.setCharacterEncoding("gb2312"); 		String username=request.getParameter("username");  //获取登录表单数据 		String userpass=request.getParameter("userpass"); 		loginDao lodo=new loginDao(); //声明操作类，调用验证方法		                                  boolean bool=lodo.CheckLogin(username, userpass); 		if(bool)  		{         //通过验证，登录成功  跳转到目标页面 			response.sendRedirect("index.jsp"); 		}else{
  			response.sendRedirect("login.jsp"); 		} 	} 	public void doPost(HttpServletRequest request, HttpServletResponse response) 			throws ServletException, IOException {
                                                  doGet(request,response); 			} }