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    • 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。

    举报该问题
    推荐答案   推荐于2019-09-17

    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>

    温馨提示：答案为网友推荐，仅供参考
    其他回答
    第1个回答  2021-06-12

    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();

    }

    }

    }

    本回答被网友采纳
    第2个回答  推荐于2017-09-08
    <%@ 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本回答被提问者采纳
    第3个回答  2019-02-12
    <%@
    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
    第4个回答  2019-07-21
    用几个html标签组成就可以出来登录界面啊
    12
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