掃碼登錄jsp源碼_jsp登陸界面源代碼

『壹』 java(jsp) 微信掃描二維碼登陸網頁

網頁上設定一些參數生成二維碼，手機掃描生成的二維碼識別出是這個網頁，然後通過http協議，將登陸信息發送給網頁後台，網頁後台驗證通過後就允許登陸

『貳』 jsp登錄代碼

login.jsp

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

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

function checkform() {
if (form4.name.value.length==0){
alert("請輸入正確的姓名！");
form4.name.focus();
return false;
}
if (form4.password.value.length==0){
alert("請輸入正確的密碼!");
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>用戶登錄</strong></div></td>
</tr>
<tr>
<td ><div align="right"><strong>用戶名:</strong></div></td>
<td colspan="1"><input type="text" name="name" /></td>
</tr>
<tr>
<td ><div align="right"><strong>密碼:</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="登錄"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("用戶名和密碼不正確！！！");
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;
%>

『叄』做一個web登錄界面，login.jsp裡面進行登錄，loginservlet進行登錄處理，然後轉回login.jsp進行顯示

首先，你jsp跳轉到Servlet是用哪種方法傳值的，是form表單提交，還是用連接（&loginok=true）這樣的提交。無論怎樣提交。boolean loginok = req.getParameter(loginok);也不對啊。req是什麼類型的啊？你的loginok是放在session裡面的。所以先創建session對象，然後在用session的內置方法獲取loginok的值。HttpSession session = request.getSession();然後在boolean loginok = session.getAttribute("loginok");
下面是我自己登陸用的Servlet希望可以幫到你：
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"); // 中文轉碼
response.setCharacterEncoding("UTF-8");

userName = request.getParameter("name"); // 獲得用戶登錄名
userPwd = request.getParameter("pwd"); // 獲得用戶密碼

bool = login.getLogin(userName, userPwd);
HttpSession session = request.getSession();
if (bool) { // 登陸成功
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 的源碼

一般jsp不會在網頁顯示代碼的，這是為了安全性問題，因此，做jsp跳轉一般只會進行內部跳轉，是不會在瀏覽器顯示代碼的

『伍』怎樣將jsp頁面放入到二維碼中並且通過掃碼得到這個jsp頁面

用jsp的path生成二維碼，就可以實現掃碼得到jsp頁面
請採納

『陸』 jsp登陸界面源代碼

<%@ 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="登錄" style="background-color:pink"> <input

type="reset" value="重置" style="background-color:red"></td>

</tr>

</table>

</form>

</body>

</html>

Data_uil.java文件代碼：

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("找到的資料庫密碼為："+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();

}

『柒』用jsp怎樣做一個用戶登錄界面

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

//這是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("登錄成功");
			}else{
			system.out.print("error");
			}
		}catch(Exceptione){
			e.printStackTrace();
		}
	}
}

簡單的登錄界面，不需要資料庫，如果要鏈接資料庫就要判斷很多了

『捌』 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>

</head>

<body>

<table>

<tr>

</tr>

<tr>

</tr>

<tr>

<td><input 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>

</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("歡迎你:" + name);

</body>

</html>

(8)掃碼登錄jsp源碼擴展閱讀：

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("找到的資料庫密碼為："+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" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<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" "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』一段很簡單的JSP代碼問題！！！

1、新建一個JSP文件把 pageEncoding="ISO-8859-1" 改成 pageEncoding="gb2312"。
2、然後把除了第一行的所有代碼先復制到一個 TXT 文件，再在 TXT 那裡全選復制到新建的JSP文件。

第二步是這樣是因為編碼改變，源代碼直接拷貝有可能出現亂碼，而復制到記事簿就轉成了純文本，再復制到新建文件就不會出現亂碼了。

『拾』如何實現網頁自動登錄

通過login.jsp將登錄頁面的全部源代碼寫在當前頁面，然後使用javascript腳本將用戶名和密碼的值填充上，最後提交表單。這樣中，終於實現了自動登錄的目標。現在我通過一個特殊的網址，就可以自動訪問這個oa了。PS
:網路的實在不理解，你把這個問題網路一下就知道

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掃碼登錄jsp源碼

(8)掃碼登錄jsp源碼擴展閱讀：

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