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我已經完成了JSP和Servlet的代碼。當證書不匹配時,我想在JSP頁面中顯示錯誤消息。我已經在servlet中編寫代碼,但它不能正確顯示在jsp頁面中。我想在密碼文本框下方顯示錯誤消息。如果有任何可用的例子,請讓我知道這將是一個很大的幫助。JSP和Servlet服務器端驗證
的index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Login Application</title>
</head>
<body>
<form action="loginServlet" method="post">
User Login
<br>
User ID
<input type="text" name="username" >
<br><br>
Password
<input type="password" name="userpass"><br>
<input type="submit" value="Login" >
</form>
</body>
</html>
LoginServlet.java
package com.test.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.amzi.dao.LoginDao;
public class LoginServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String n=request.getParameter("username");
String p=request.getParameter("userpass");
HttpSession session = request.getSession(false);
if(session!=null)
session.setAttribute("name", n);
if(LoginDao.validate(n, p)){
RequestDispatcher rd=request.getRequestDispatcher("welcome.jsp");
rd.forward(request,response);
}
else{
out.print("Wrong Credentials");
RequestDispatcher rd=request.getRequestDispatcher("index.jsp");
rd.include(request,response);
}
out.close();
}
}
這裏是我的代碼,請更正。
LoginDao.validate()是否經過測試?這很可能是罪魁禍首 – GurV