推荐课程：Java教程。
如果登录成功，页面会显示登录成功，如果密码错误，则页面会显示登录失败。连接数据库使用的事javabean方法，需要实现下载好sqlserver2008的驱动程序，在web project文件夹下的src文件夹下新建包“Bean”，并在此包下新建“DBBean.java”文件。
DBBean.java文件代码如下：
package Bean;import java.sql.*;public class DBBean { private String driverStr = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; private String connStr = "jdbc:sqlserver://localhost:1433; DatabaseName=JXP"; private String dbusername = "sa"; private String dbpassword = "123456"; private Connection conn = null; private Statement stmt = null; public DBBean() { try { Class.forName(driverStr); conn = DriverManager.getConnection(connStr, dbusername, dbpassword); stmt = conn.createStatement(); } catch (Exception ex) { System.out.println("数据连接失败！"); } } public int executeUpdate(String s) { int result = 0; System.out.println("--更新语句:"+s+"\n"); try { result = stmt.executeUpdate(s); } catch (Exception ex) { System.out.println("执行更新错误！"); } return result; } public ResultSet executeQuery(String s) { ResultSet rs = null; System.out.print("--查询语句:"+s+"\n"); try { rs = stmt.executeQuery(s); } catch (Exception ex) { System.out.println("ִ执行查询错误！"); } return rs; } public void execQuery(String s){ try { stmt.executeUpdate(s); } catch (SQLException e) { // TODO Auto-generated catch block System.out.println("执行插入错误！"); } } public void close() { try { stmt.close(); conn.close(); } catch (Exception e) { } }}在WEBROOT目录下有三个jsp页面文件：分别是login.jsp,logincheck.jsp,loginsuccess.jsp.在login.jsp页面中，可以通过输入用户名、密码，点击登录按钮，实现登录成功loginsucccess.jsp页面的跳转，如果密码错误，则页面会跳转到登录失败的页面。（当然，在进行页面跳转之前，需要在sqlserver2008中新建一个数据库，在数据库目录下新建一个表，并填入表的信息）
文件夹结构截图：
login.jsp登录界面代码:
<%@ page import="java.sql.*" language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>登录界面</title></head><body> <center> <h1 style="color:red">登录</h1> <form id="indexform" name="indexForm" action="logincheck.jsp" method="post"> <table border="0"> <tr> <td>账号：</td> <td><input type="text" name="username"></td> </tr> <tr> <td>密码：</td> <td><input type="password" name="password"> </td> </tr> </table> <br> <input type="submit" value="登录" style="color:#BC8F8F"> </form> <form action="zhuce.jsp"> <input type="submit" value="注册" style="color:#BC8F8F"> </form> </center></body></html>
indexcheck.jsp登录失败代码：
<%@ page import="java.sql.*" language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body><jsp:useBean id="db" class="Bean.DBBean" scope="page" /><% request.setCharacterEncoding("UTF-8"); String username=(String)request.getParameter("username"); String password=(String)request.getParameter("password");//取出login.jsp的值 //下面是数据库操作 String sql="select * from login where username="+"'"+username+"'";//定义一个查询语句 ResultSet rs=db.executeQuery(sql);//运行上面的语句 if(rs.next()) { /* if(password.equals(rs.getString(2))) { } */ if(password.equals(rs.getObject("password"))){ response.sendRedirect("loginsuccess.jsp"); } else{ out.print("<script language='javaScript'> alert('密码错误');</script>"); response.setHeader("refresh", "0;url=login.jsp"); } } else { out.print("<script language='javaScript'> alert('账号错误——else');</script>"); response.setHeader("refresh", "0;url=login.jsp"); } %></body></html>indexsuccess.jsp登录成功代码：
<%@ page import="java.sql.*" language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body><h1>登陆成功</h1></body></html>
最终的页面效果如下：
如果全都正确，则显示如下页面：
如果密码错误，则显示如下页面：
以上就是jsp里怎么写登录界面的知识。速戳>>知识兔学习精品课！