扫码登录jsp源码_jsp登陆界面源代码

‘壹’ java(jsp) 微信扫描二维码登陆网页

网页上设定一些参数生成二维码，手机扫描生成的二维码识别出是这个网页，然后通过http协议，将登陆信息发送给网页后台，网页后台验证通过后就允许登陆

‘贰’ jsp登录代码

login.jsp

<%@ page language="java" pageEncoding="utf-8"%>
<html>
<head>

<title>登录</title>
<script language="javascript">

function checkform() {
if (form4.name.value.length==0){
alert("请输入正确的姓名！");
form4.name.focus();
return false;
}
if (form4.password.value.length==0){
alert("请输入正确的密码!");
form4.password.focus();
return false;
}

}
</script>
<style type="text/css">

</style>
</head>

<body>
<div id="Layer1" style="left: 16px; width: 369px;">
<form id="form4" name="form4" method="post" action="loginControl.jsp">
<table border="0" style="top: 443px; left: 17px; width: 240px; height: 240px;">
<tr>
<td colspan="3"> <div align="center"><strong>用户登录</strong></div></td>
</tr>
<tr>
<td ><div align="right"><strong>用户名:</strong></div></td>
<td colspan="1"><input type="text" name="name" /></td>
</tr>
<tr>
<td ><div align="right"><strong>密码:</strong><strong> </strong></div></td>
<td colspan="1"><input type="password" name="password" /></td>
</tr>
<tr>
<td height="37" colspan="3">
<label>
<input type="submit" name="Submit" value="登录"onclick="javascript:return(checkform());" />

</label>
<input type="reset" name="reset" value="重填" />

</td>
</tr>
</table>
</form>
</div>
<div id="Layer2"> <img src=2.jpg width="120" height="120"/></div>
<label></label>
</body>
</html>

loginControl.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ include file="tdb.jsp"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<style type="text/css">

</style>
<head>
<title>My JSP 'loginControl.jsp' starting page</title>
</head>
<body>
<%
String name= request.getParameter("name");
String password= request.getParameter("password");
System.out.println("成功11111");
sql="SELECT * FROM tdb WHERE user_Name='"+name+"' AND user_Pwd='"+password+"'";
rs = smt.executeQuery(sql);
if(!rs.next())
{%>
<script type="text/javascript">
alert("用户名和密码不正确！！！");
window.location.href='index.jsp';
</script><%

}
response.sendRedirect("main.jsp");
%>
</body>
</html>

tdb.jsp

<%

Class.forName("oracle.jdbc.OracleDriver");

java.sql.Connection con=null;
con=java.sql.DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:ABC","zhan","123");
java.sql.Statement smt=con.createStatement();
java.sql.ResultSet rs;
java.sql.PreparedStatement ps;
String sql;
%>

‘叁’ 做一个web登录界面，login.jsp里面进行登录，loginservlet进行登录处理，然后转回login.jsp进行显示

首先，你jsp跳转到Servlet是用哪种方法传值的，是form表单提交，还是用连接（&loginok=true）这样的提交。无论怎样提交。boolean loginok = req.getParameter(loginok);也不对啊。req是什么类型的啊？你的loginok是放在session里面的。所以先创建session对象，然后在用session的内置方法获取loginok的值。HttpSession session = request.getSession();然后在boolean loginok = session.getAttribute("loginok");
下面是我自己登陆用的Servlet希望可以帮到你：
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String userName = "";
String userPwd = "";
String flag = "";
flag = request.getParameter("flag");
if (flag == null) {
flag = "";
}
if (flag.equals("back")) {
HttpSession session = request.getSession();
session.invalidate();
flag = "";
response.sendRedirect("/MicroBlog/initServlet");
} else {
boolean bool = false;
action login = new action();
try {
RequestDispatcher rd = null;
request.setCharacterEncoding("UTF-8"); // 中文转码
response.setCharacterEncoding("UTF-8");

userName = request.getParameter("name"); // 获得用户登录名
userPwd = request.getParameter("pwd"); // 获得用户密码

bool = login.getLogin(userName, userPwd);
HttpSession session = request.getSession();
if (bool) { // 登陆成功
UserForm userForm = login.getUser();
ArrayList<String> guanList = login.getGuan(userForm.getId());
ArrayList<ExForm> expList = login.getExp();
session.setAttribute("exp", expList);
session.setAttribute("user", userForm);
session.setAttribute("guan", guanList);
rd = request.getRequestDispatcher("user.jsp");

} else {
rd = request.getRequestDispatcher("error.jsp");
}

rd.forward(request, response);

} catch (Exception e) {
e.printStackTrace();
}
}
}

‘肆’ 如何看到 JSP 的源码

一般jsp不会在网页显示代码的，这是为了安全性问题，因此，做jsp跳转一般只会进行内部跳转，是不会在浏览器显示代码的

‘伍’ 怎样将jsp页面放入到二维码中并且通过扫码得到这个jsp页面

用jsp的path生成二维码，就可以实现扫码得到jsp页面
请采纳

‘陆’ jsp登陆界面源代码

<%@ 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>

</head>

<body>

<table>

<tr>

</tr>

<tr>

</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();

}

‘柒’ 用jsp怎样做一个用户登录界面

//jsp文件,登录界面
<%@pagepageEncoding="utf-8"contentType="text/html;charset=utf-8"%>
<body>
<h1>Register</h1>
<hr/>
<formaction="login"method="post">
用户名：š
<inputtype="text"name="username"id="text"/>
密码：š
<inputtype="password"name="pwd"id="text"//>
<inputtype="submit"value="登录"id="button"/>
</form>
</body>

//这是server文件，web.xml部署名字login
importjava.io.IOException;

importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjavax.servlet.http.HttpSession;

{

	publicvoidservice(HttpServletRequestrequest,HttpServletResponseresponse)
	throwsServletException,IOException{

		response.setContentType("text/html;charset=utf-8");
		request.setCharacterEncoding("utf-8");
		Stringusername=request.getParameter("username");
		Stringpwd=request.getParameter("pwd");

		try{
			if(username.equals（"name"）&&pwd.equals("pwd")){
			system.out.print("登录成功");
			}else{
			system.out.print("error");
			}
		}catch(Exceptione){
			e.printStackTrace();
		}
	}
}

简单的登录界面，不需要数据库，如果要链接数据库就要判断很多了

‘捌’ jsp登陆界面源代码

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>

</head>

<body>

<table>

<tr>

</tr>

<tr>

</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>

</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>

</head>

<body>

request.setCharacterEncoding("GB18030");

String name = request.getParameter("userName");

out.println("欢迎你:" + name);

</body>

</html>

(8)扫码登录jsp源码扩展阅读：

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>

<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>

<title>Insert title here</title>

</head>

<body>

</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>

</head>

<h1 style="color:yellow">Login</h1>

<br>

<tr >

</tr>

<tr>

</td>

</tr>

</table>

<br>

</form>

</center>

</body>

</html>

‘玖’ 一段很简单的JSP代码问题！！！

1、新建一个JSP文件把 pageEncoding="ISO-8859-1" 改成 pageEncoding="gb2312"。
2、然后把除了第一行的所有代码先复制到一个 TXT 文件，再在 TXT 那里全选复制到新建的JSP文件。

第二步是这样是因为编码改变，源代码直接拷贝有可能出现乱码，而复制到记事簿就转成了纯文本，再复制到新建文件就不会出现乱码了。

‘拾’ 如何实现网页自动登录

通过login.jsp将登录页面的全部源代码写在当前页面，然后使用javascript脚本将用户名和密码的值填充上，最后提交表单。这样中，终于实现了自动登录的目标。现在我通过一个特殊的网址，就可以自动访问这个oa了。PS
:网络的实在不理解，你把这个问题网络一下就知道

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扫码登录jsp源码

(8)扫码登录jsp源码扩展阅读：

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