Implement Authentication filter using filter API

<!-- HTML File -->
<html>
<head>
    <title>Filter API</title>
    <style>
        .b1 {
            width: 370px;
            height: 42px;
            margin: 10px;
            color: white;
            background-color: #008CBA;
            border: 0px solid grey;
            cursor: pointer;
        }
        .side {
            padding: 10px;
            margin: 20px;
            width: 370px;
        }
        .b1:hover {
            background-color: #4CAF50;
        }
    </style>
</head>
<body bgcolor="#222222">
    <div class="box">
        <form action="filtering" style="text-align:center;">
            <h1 style="color:white;font-family: Times;margin-top:160px;">Login Portal</h1>
            <input class="side" type="text" required="" name="name" placeholder="UserName"><br>
            <input class="side" type="password" required="" name="password" placeholder="Password" style=margin-top:-5px;">
            <br>
            <input class="b1" type="submit" value="Login">
        </form>
    </div>
</body>
</html>

Posted by: Guest on April-30-2021

<?xml version="1.0" encoding="UTF-8"?> <web-app> <servlet> <servlet-name>ServletFilter</servlet-name> <servlet-class>ServletFilter</servlet-class> </servlet> <welecome-file-list> <welcome-file>index.html</welcome-file> </welecome-file-list> <servlet-mapping> <servlet-name>ServletFilter</servlet-name> <url-pattern>/filtering</url-pattern> </servlet-mapping> <filter> <filter-name>f1</filter-name> <filter-class>MyFilter</filter-class> </filter> <filter-mapping> <filter-name>f1</filter-name> <url-pattern>/filtering</url-pattern> </filter-mapping> </web-app>

//Java file import java.io.*; import javax.servlet.*; public class MyFilter implements Filter { @Override public void init(FilterConfig arg0) throws ServletException { } @Override public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException { PrintWriter pw = resp.getWriter(); String pwd = req.getParameter("password"); if (pwd.equals("birju")) { chain.doFilter(req, resp); } else { pw.print("Invalid Password"); RequestDispatcher redi = req.getRequestDispatcher("index.html"); redi.include(req, resp); } } @Override public void destroy() { } }

//Servlet file import java.io.*; import javax.servlet.http.HttpServlet; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ServletFilter extends HttpServlet { @Override public void doGet(HttpServletRequest res, HttpServletResponse resp) throws IOException, ServletException { resp.setContentType("text/html;charset=UTF-8"); PrintWriter out = resp.getWriter(); String str = res.getParameter("name"); out.print("<h1>Hello " + str + "</h1><h2>You have sucessfully logged in....</h2>"); } }

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