📄 loginservlet.java
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package coreservlets;import java.io.IOException;import java.io.PrintWriter;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 LoginServlet extends HttpServlet { protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username = request.getParameter("uname"); String password = request.getParameter("passwd"); response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); try { if ((username.equals("haris")) && (password.equals("1234"))) { //successful login HttpSession session = request.getSession(true); synchronized (session) { session.setAttribute("login", "true"); } response.sendRedirect("./main.html"); } else { //unsuccessful login out.println("<html>"); out.println("<head>"); out.println("<title>Unsuccessful Login</title>"); out.println("</head>"); out.println("<body>"); out.println("<br><p align=\"center\">Please try <a href=\"./login.html\">again</a></p>"); out.println("</body>"); out.println("</html>"); } }catch(Exception ex) { out.println("<html>"); out.println("<head>"); out.println("<title>Error</title>"); out.println("</head>"); out.println("<body>"); out.println("Unknown error<br>"); out.println(ex.getMessage()); out.println("</body>"); out.println("</html>"); }finally { out.close(); } } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } @Override public String getServletInfo() { return "Short description"; }}⌨️ 快捷键说明
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