jsp登陆界面源代码

用jsp或java或是两者合用编写一个登陆源代码,用户名abc密码123如果登陆或是密码错误显示“登陆或密码错误,请重新登陆”然后返回登陆界面。... 用jsp或java或是两者合用编写一个登陆源代码,用户名abc密码123 如果登陆或是密码错误显示“登陆或密码错误,请重新登陆”然后返回登陆界面。 展开
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yihla5739
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推荐于2019-09-17 · 每个回答都超有意思的
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1、login.jsp文件

<%@ page language="java" contentType="text/html; charset=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/html; charset=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/html; charset=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://127.0.0.1:1433;DatabaseName=***";

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/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>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", "0;url=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", "0;url=user_login.jsp");

}

else if(passwordInDataBase.equals(password))

{

out.print("<script language='javaScript'> alert('登录成功');</script>");

response.setHeader("refresh", "0;url=loginSucces.jsp");

}

else

{

out.print("<script language='javaScript'> alert('密码错误');</script>");

response.setHeader("refresh", "0;url=user_login.jsp");

}

}

%>

</body>

</html>

3、loginSucces.jsp文件

<%@ page 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>

<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/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>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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2021-06-12 · 最爱分享有趣的游戏日常!
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login.jsp文件

<%@ page language="java" contentType="text/html; charset=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>

Data_uil.java文件代码:

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://127.0.0.1:1433;DatabaseName=***";

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();

}

}

}

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<%@ page language="java" contentType="text/html; charset=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>

<%@ page language="java" contentType="text/html; charset=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")) {

%>
<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/html; charset=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>

总共3个jsp文件,第一个是login.jsp,第2个是judge.jsp,第3个是afterLogin.jsp
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2019-02-12 · TA获得超过3825个赞
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<%@
page
language="java"
contentType="text/html;
charset=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>
<%@
page
language="java"
contentType="text/html;
charset=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"))
{
%>
<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/html;
charset=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>
总共3个jsp文件,第一个是login.jsp,第2个是judge.jsp,第3个是afterLogin.jsp
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老红点评
2019-07-21 · TA获得超过3819个赞
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用几个html标签组成就可以出来登录界面啊
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