jsp編寫用戶登錄界面,jsp做登錄界面

本文目錄一覽：

• 1、jsp登陸界面源代碼
• 2、用jsp怎樣做一個用戶登錄界面
• 3、編寫用戶註冊於登錄的JSP頁面的全部程序代碼
• 4、用jsp編寫一個很簡單的登陸頁面
• 5、jsp下登錄界面的方法

jsp登陸界面源代碼

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登錄頁面/title

/head

body

form name=”loginForm” method=”post” action=”judgeUser.jsp”

table

tr

td用戶名:input type=”text” name=”userName” id=”userName”/td

/tr

tr

td密碼:input type=”password” name=”password” id=”password”/td

/tr

tr

tdinput type=”submit” value=”登錄” 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身份驗證/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登錄成功/title

/head

body

%

request.setCharacterEncoding(“GB18030”);

String name = request.getParameter(“userName”);

out.println(“歡迎你:” + name);

%

/body

/html

擴展資料：

java web登錄界面源代碼：

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();//可執行的     查詢

if(result.next())

password=result.getString(“password”);

}catch(SQLException e){

e.printStackTrace();

}finally

{

close(preparedStatement);

close(result);

close(connection);

}

System.out.println(“找到的數據庫密碼為：”+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” “”

html

head

meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″

title驗證用戶密碼/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(‘用戶名不能為空’);/script”);

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

}

else

{

System.out.println(“輸入的用戶名:”+username);

String passwordInDataBase=util.selectPassword(username);

System.out.println(“密碼：”+passwordInDataBase);

if(passwordInDataBase==null||””.equals(passwordInDataBase))

{

out.print(“script language=’javaScript’ alert(‘用戶名不存在’);/script”);

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

}

else if(passwordInDataBase.equals(password))

{

out.print(“script language=’javaScript’ alert(‘登錄成功’);/script”);

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

}

else

{

out.print(“script language=’javaScript’ alert(‘密碼錯誤’);/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” “”

html

head

meta http-equiv=”Content-Type” content=”text/html; charset=ISO-8859-1″

titleInsert title here/title

/head

body

hr size=”10″ width=”26%” align=”left” color=”green”

font size=”6″ color=”red” 登錄成功 /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” “”

html

head

meta http-equiv=”Content-Type” content=”text/html; charset=ISO-8859-1″

title登錄界面/title

/head

body  background=”C:\Users\win8\workspace\Login\image\9dcbdc339e72a5663b5c289fb5573c13_10.jpg”

center

brbrbrbrbrbr

h1 style=”color:yellow”Login/h1

br

form name=”loginForm” action=”login_check.jsp” method=”post” 

table Border=”0″

tr

td賬號/td

tdinput type=”text” name=”username”/td

/tr

tr

td密碼/td

tdinput type=”password” name=”password”

/td

/tr

/table

br

input type=”submit” value=”登錄” style=”color:#BC8F8F”

/form

/center

/body

/html

用jsp怎樣做一個用戶登錄界面

//jsp文件,登錄界面

%@page pageEncoding=”utf-8″ contentType=”text/html; charset = utf-8″%

body

h1Register/h1

hr /

form action=”login” method=”post”

用戶名：š

input type=”text” name=”username” id=”text” /

密 碼：š

input type=”password” name=”pwd” id=”text” //

input type=”submit” value=”登錄” id=”button” /

/form

/body

//這是server文件，web.xml部署名字login

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class AddUser extends HttpServlet {

public void service(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType(“text/html;charset=utf-8”);

request.setCharacterEncoding(“utf-8”);

String username=request.getParameter(“username”);

String pwd=request.getParameter(“pwd”);

try{

if(username.equals（”name”）pwd.equals(“pwd”) ){

    system.out.print(“登錄成功”);

}else{

    system.out.print(“error”);

}

}catch(Exception e){

e.printStackTrace();

}

}

}

簡單的登錄界面，不需要數據庫，如果要鏈接數據庫就要判斷很多了

編寫用戶註冊於登錄的JSP頁面的全部程序代碼

3個jsp文件，第一個是login.jsp,第二個是judge.jsp,第三個是afterLogin.jsp

%@ 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登錄頁面/title

/head

body

form name=”loginForm” method=”post” action=”judgeUser.jsp”

table

tr

td用戶名:input type=”text” name=”userName” id=”userName”/td

/tr

tr

td密碼:input type=”password” name=”password” id=”password”/td

/tr

tr

tdinput type=”submit” value=”登錄” 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身份驗證/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登錄成功/title

/head

body

%

request.setCharacterEncoding(“GB18030”);

String name = request.getParameter(“userName”);

out.println(“歡迎你:” + name);

%

/body

/html

用jsp編寫一個很簡單的登陸頁面

login.JSP

注: 由於時間倉促,程序可能有細小的問題!但絕對可以滿足你的需要了!如果你知道JSP什麼原理;那麼小的問題不是什麼問題了! 共同學習~~~

%@ page contentType = “text/html;charset=GB2312” %

%@ page import = “java.sql.*” %

html

head

title/title

/head

body bgcolor=LightBlue

div align=”center”

br

H1歡迎光臨企業辦公平台/H1

form name=”form1″ method=”post” action=”” target=”_self”

table width=”90%”

tr

td width=”50%” height=”30″ align=”right”用戶名：/td

td width=”50%” height=”30″ align=”left” input type=”text” name=”UserName”/td

/tr

tr

td width=”50%” height=”30″ align=”right”密碼：/td

td width=”50%” height=”30″ align=”left” input type=”password” name=”UserPassword”/td

/tr

td width=”100%” height=”40″ align=”center” colspan=”2″

input type=”submit” name=”sub” value=”登錄”  

/td

/tr

/table

/form

/div

% try

{Class.forName(“sun.jdbc.odbc.JdbcOdbcDriver”);

Connection conn=DriverManager.getConnection(“jdbc:odbc:a”,”root”,”database1″);

Statement stmt = conn.createStatement(

ResultSet.TYPE_SCROLL_INSENSITIVE,

ResultSet.CONCUR_READ_ONLY);

ResultSet rs = null;

String name =new String(request.getParameter(“

UserName”).getBytes(“8859_1”));

String passwd =new String(request.getParameter(“

UserPassword”).getBytes(“8859_1”));

if(String_sql==null)

{

out.println(“登陸名不可以為空”);

out.println(“HR”);

}

else{

String_sql=”select * from student where name =”+name+” and password=”+psword+;

rs=stmt.executeQuery(String_sql)

while(rs.next())

{ out.println(“登陸成功！”);

out.println(“您的用戶名是:”+name)

out.println(“您的密碼是：”+password);

rs.close();

stmt.close();

conn.close();}

}

Catch( Exception e )

{out.println(“font color=red size=5B”);

out.println(“出錯了!”);

out.println(“/B/font”);

}%

/body

/html

jsp下登錄界面的方法

關鍵是sql語句，如果你用jdbc+dao的話就是

select count(當前表的id名比如id) from user where userid= 接收的用戶名 and password=接收的密碼

然後取得值看該值是否大於0，如果大於0返回一個true值或者直接返回該值，然後判斷只要大於0就表示登錄成功，和數據庫中一樣。

你可以通過request跳轉，如果登錄成功就跳轉到登錄成功界面，並把你的登錄信息保存到session中。否則就直接重定向到登錄界面讓用戶重新登錄。

你可以去百度搜索

java jsp 登錄 csdn

這樣可以從csdn下載相關的登錄實例，裡面有詳細的代碼，可以最大程度上幫助你。