<%
//验证的java语句，就是执行先获得提交的参数，可以用request.getparameter("username"),密码同上，然后就是连接数据库进行比较的代码，
但是最好还是action到相应的servlet来处理，你可以通过eclipse等ide来创建，具体的还是多百度几下，网上这种东西太多了
可以直接在jsp中写java代码，用<%%>括起来java代码就可以了；页面与后台数据交互，就是后台有截获页面请求的方法，页面通过url请求把数据拼接到url中向后台请求，后台截获请求响应匹配的方法，并且拿到数据，然后处理完返回数据给页面，完成数据交互。
方式的话可以是form提交，ajax访问，servlet访问等。
1、login.jsp文件
<%@ page language="java" contentType="text/htmlcharset=GB18030"
pageEncoding="GB18030"%>
<%@ page import="java.util.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>登录页面</title>
</head>
<body>
<form name="loginForm" method="post" action="judgeUser.jsp">
<table>
<tr>
<td>用户名:<input type="text" name="userName" id="userName"></td>
</tr>
<tr>
<td>密码:<input type="password" name="password" id="password"></td>
</tr>
<tr>
<td><input type="submit" value="登录" style="background-color:pink"><input
type="reset" value="重置" style="background-color:red"></td>
</tr>
</table>
</form>
</body>
</html>
2、judge.jsp文件
<%@ page language="java" contentType="text/htmlcharset=GB18030"
pageEncoding="GB18030"%>
<%@ page import="java.util.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>身份验证</title>
</head>
<body>
<%
request.setCharacterEncoding("GB18030")
String name = request.getParameter("userName")
String password = request.getParameter("password")
if(name.equals("abc")&&password.equals("123")) {
3、afterLogin.jsp文件
%>
<jsp:forward page="afterLogin.jsp">
<jsp:param name="userName" value="<%=name%>"/>
</jsp:forward>
<%
}
else {
%>
<jsp:forward page="login.jsp"/>
<%
}
%>
</body>
</html>
<%@ page language="java" contentType="text/htmlcharset=GB18030"
pageEncoding="GB18030"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>登录成功</title>
</head>
<body>
<%
request.setCharacterEncoding("GB18030")
String name = request.getParameter("userName")
out.println("欢迎你:" + name)
%>
</body>
</html>
扩展资料：
java web登录界面源代码：
1、Data_uil.java文件
import java.sql.*
public class Data_uil
{
public Connection getConnection()
{
try{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver")
}catch(ClassNotFoundException e)
{
e.printStackTrace()
}
String user="***"
String password="***"
String url="jdbc:sqlserver://127.0.0.1:1433DatabaseName=***"
Connection con=null
try{
con=DriverManager.getConnection(url,user,password)
}catch(SQLException e)
{
e.printStackTrace()
}
return con
}
public String selectPassword(String username)
{
Connection connection=getConnection()
String sql="select *from login where username=?"
PreparedStatement preparedStatement=null
ResultSet result=null
String password=null
try{
preparedStatement=connection.prepareStatement(sql)
preparedStatement.setString(1,username)
result=preparedStatement.executeQuery()//可执行的 查询
if(result.next())
password=result.getString("password")
}catch(SQLException e){
e.printStackTrace()
}finally
{
close(preparedStatement)
close(result)
close(connection)
}
System.out.println("找到的数据库密码为："+password)
return password
}
public void close (Connection con)
{
try{
if(con!=null)
{
con.close()
}
}catch(SQLException e)
{
e.printStackTrace()
}
}
public void close (PreparedStatement preparedStatement)
{
try{
if(preparedStatement!=null)
{
preparedStatement.close()
}
}catch(SQLException e)
{
e.printStackTrace()
}
}
public void close(ResultSet resultSet)
{
try{
if(resultSet!=null)
{
resultSet.close()
}
}catch(SQLException e)
{
e.printStackTrace()
}
}
}
2、login_check.jsp:文件
<%@ page language="java" contentType="text/htmlcharset=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/htmlcharset=utf-8">
<title>验证用户密码</title>
</head>
<body>
<jsp:useBean id="util" class="util.Data_uil" scope="page" />
<%
String username=(String)request.getParameter("username")
String password=(String)request.getParameter("password")
if(username==null||"".equals(username))
{
out.print("<script language='javaScript'>alert('用户名不能为空')</script>")
response.setHeader("refresh", "0url=user_login.jsp")
}
else
{
System.out.println("输入的用户名:"+username)
String passwordInDataBase=util.selectPassword(username)
System.out.println("密码："+passwordInDataBase)
if(passwordInDataBase==null||"".equals(passwordInDataBase))
{
out.print("<script language='javaScript'>alert('用户名不存在')</script>")
response.setHeader("refresh", "0url=user_login.jsp")
}
else if(passwordInDataBase.equals(password))
{
out.print("<script language='javaScript'>alert('登录成功')</script>")
response.setHeader("refresh", "0url=loginSucces.jsp")
}
else
{
out.print("<script language='javaScript'>alert('密码错误')</script>")
response.setHeader("refresh", "0url=user_login.jsp")
}
}
%>
</body>
</html>
3、loginSucces.jsp文件
<%@ page language="java" contentType="text/htmlcharset=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/htmlcharset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<hr size="10" width="26%" align="left" color="green">
<font size="6" color="red" >登录成功 </font>
<hr size="10" width="26%" align="left" color="green">
</body>
</html>
4、user_login.jsp文件
<%@ page language="java" contentType="text/htmlcharset=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/htmlcharset=ISO-8859-1">
<title>登录界面</title>
</head>
<body background="C:\Users\win8\workspace\Login\image\9dcbdc339e72a5663b5c289fb5573c13_10.jpg" >
<center>
<br><br><br><br><br><br>
<h1 style="color:yellow">Login</h1>
<br>
<form name="loginForm" action="login_check.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>
</center>
</body>
</html>
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