@WebServlet("/admin/addCourse") public class AddCourseController extends HttpServlet { private static final long serialVersionUID = 1L; public AddCourseController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String isbn = request.getParameter("isbn"); String bookName = request.getParameter("bookName"); String content = request.getParameter("content"); String author = request.getParameter("author"); String press = request.getParameter("press"); String tname = request.getParameter("tname"); Date createTime = new Date(); Courses course = new Courses(); course.setIsbn(isbn); course.setContent(content); course.setAuthor(author); course.setPress(press); course.setPressTime(createTime); course.setBookName(bookName); course.setTname(tname); CoursesService courseService = new CoursesService(); Courses query = courseService.getISBN(isbn); if(query != null) { request.setAttribute("msg", "isbn为"+isbn+"的教材已经存在"); request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request, response); return; } courseService.addCourse(course); request.getRequestDispatcher("/admin/managecoursesUrl").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }

@WebServlet("/admin/managecoursesUrl") public class ManageCourseController extends HttpServlet { private static final long serialVersionUID = 1L; public ManageCourseController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { CoursesService coursesSerice = new CoursesService(); List<Courses> courses = coursesSerice.getCourseList(); request.setAttribute("courses", courses); request.getRequestDispatcher("/WEB-INF/pages/manage-course.jsp").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }

这是一个基于Servlet的Java Web应用程序中的ManageCourseController类。它处理/admin/managecoursesUrl的GET请求，通过CoursesService获取课程列表并将其作为属性添加到请求中，然后将请求转发到manage-course.jsp...

@WebServlet("/admin/adminUserUrl") public class AdminUserController extends HttpServlet { private static final long serialVersionUID = 1L; public AdminUserController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { UserService userService = new UserService(); List<User>users = userService.getUserList(); request.setAttribute("users", users); request.getRequestDispatcher("/WEB-INF/pages/admin/admin-user.jsp").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }

这是一个基于Servlet的Java Web应用程序中的AdminUserController类。它处理/admin/adminUserUrl的GET请求，通过UserService获取用户列表并将其作为属性添加到请求中，然后将请求转发到admin-user.jsp页面。POST请求...

@WebServlet("/introduceUrl") public class IntroduceController extends HttpServlet { private static final long serialVersionUID = 1L; public IntroduceController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub request.getRequestDispatcher("/WEB-INF/pages/introduce.jsp").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }

这是一个使用 Servlet 技术实现的介绍控制器，它提供了 doGet() 和 doPost() 两个方法来处理 GET 和 POST 请求。在 doGet() 方法中，它直接将请求转发到 "/WEB-INF/pages/introduce.jsp" 页面进行展示。在 doPost() ...

@WebServlet("/updateInfo") public class UpdateInfoController extends HttpServlet { private static final long serialVersionUID = 1L; public UpdateInfoController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String description = request.getParameter("description"); User user = (User) request.getSession().getAttribute("loginUser"); request.getRequestDispatcher("/infoUrl").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }

这是一个Java Servlet，其中定义了一个名为UpdateInfoController的类。该类继承了HttpServlet类，实现了doGet和doPost方法。在doGet方法中，它首先从请求中获取名为description的参数，并从会话中获取名为loginUser...

@WebServlet("/coursesUrl") public class CoursesController extends HttpServlet { private static final long serialVersionUID = 1L; public CoursesController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { CoursesService coursesSerice = new CoursesService(); User user = (User) request.getSession().getAttribute("loginUser"); List<Courses> courses = coursesSerice.getCourseList(); request.setAttribute("courses", courses); request.getRequestDispatcher("/WEB-INF/pages/courses.jsp").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); }

这是一个使用 Servlet 技术实现的课程控制器，它提供了 doGet() 和 doPost() 两个方法来处理 GET 和 POST 请求。在 doGet() 方法中，它首先通过 CoursesService 类获取了课程列表，然后将该列表以 "courses" 属性的...

@WebServlet("/buycoursesUrl") public class BuyCoursesController extends HttpServlet { private static final long serialVersionUID = 1L; public BuyCoursesController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { CoursesService coursesSerice = new CoursesService(); User user = (User) request.getSession().getAttribute("loginUser"); List<StudentBuy> StudentBuy = coursesSerice.getBuyCourseList(user.getUsername()); request.setAttribute("buys", StudentBuy); request.getRequestDispatcher("/WEB-INF/pages/buycourses.jsp").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }

这是一个基于 Java Servlet 技术实现的课程信息管理系统中的购买课程的控制器类。它接收一个 HTTP GET 请求，从当前用户的会话中获取登录的用户对象，并调用 CoursesService 类的 getBuyCourseList 方法获取该用户已...

public class DeleteUserController extends HttpServlet { private static final long serialVersionUID = 1L; public DeleteUserController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Integer userId = Integer.valueOf( request.getParameter("userId")); UserService userService = new UserService(); userService.deleteUser(userId); request.getRequestDispatcher("/admin/adminUserUrl").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }

这是一个 Java Servlet 类，用于处理 HTTP GET 请求和 POST 请求。它接收一个名为 "userId" 的参数，将其转换为整数类型，然后调用 ...最后，将请求转发到 "/admin/adminUserUrl" 页面。你有什么其他的问题吗？

@WebServlet(name = "login", value = "*.action") public class CenterController extends HttpServlet

这是一个名为 CenterController 的 Servlet，它会处理所有以 ".action" 结尾的 URL 请求。其中，name 属性为 "login"，表示这个 Servlet 的名字是 "login"。Servlet 是 Java Web 应用程序中的一个组件，它可以接收 ...

@WebServlet("/admin/addScore") public class AddScoreController extends HttpServlet { private static final long serialVersionUID = 1L; public AddScoreController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String isbn = request.getParameter("isbn"); String courseName = request.getParameter("courseName"); String className = request.getParameter("className"); String num = request.getParameter("num"); Score score = new Score(); score.setIsbn(isbn); score.setCourseName(courseName); score.setClassName(className); score.setNum(Integer.valueOf(num)); ScoreService scoreService = new ScoreService(); scoreService.addScore(score); request.getRequestDispatcher("/admin/tecoursesUrl").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }

这是一个Java Servlet，用于处理添加成绩的请求。根据请求中的参数，创建一个Score对象，设置其属性，并将其传递给ScoreService进行添加。然后，将请求重定向到"/admin/tecoursesUrl"页面。其中，doGet()方法处理...

import java.io.IOException; import ja.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/login") public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public LoginServlet() { super(); } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username = request.getParameter("username"); String password = request.getParameter("password"); if ("admin".equals(username) && "admin".equals(password)) { response.sendRedirect("success.jsp"); } else { response.sendRedirect("fail.jsp"); } } }

这段代码使用了Java Servlet技术实现了一个简单的登录功能。代码中实现了一个名LoginServlet的Servlet类，使用@WebServlet注解将映射到了路径“/login”，当用户在浏览器中访问该路径时，就会由该Servlet类来处理...

package com.sj.newsrelease.servlet; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/LogoutServlet") public class LogoutServlet extends HttpServlet { private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.用户注销 request.getSession().removeAttribute("user"); //2.从客户端删除自动登录的cookie Cookie cookie = new Cookie("autologin", "msg"); cookie.setPath(request.getContextPath()); cookie.setMaxAge(0); response.addCookie(cookie); response.sendRedirect(request.getContextPath()+"/login.jsp"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }给我解释一下这段代码

这段代码使用了 Java Servlet API 和 Cookie API，其中 @WebServlet("/LogoutServlet") 注解表示该 Servlet 的访问路径为 "/LogoutServlet"。同时，doGet() 方法会处理 GET 请求，而 doPost() 方法会将其转发到 ...

@WebServlet("/admin/updateCourse") public class UpdateCourseController extends HttpServlet { private static final long serialVersionUID = 1L; public UpdateCourseController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String isbn = request.getParameter("isbn"); String bookName = request.getParameter("bookName"); String tname = request.getParameter("tname"); Date createTime = new Date(); Courses course = new Courses(); course.setIsbn(isbn); course.setBookName(bookName); course.setTname(tname); course.setPressTime(createTime); CoursesService courseService = new CoursesService(); Courses query = courseService.getISBN(isbn); if(query == null) { request.setAttribute("msg", "isbn为"+isbn+"的课程不存在！"); request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request, response); return; } courseService.updateCourse(course); request.getRequestDispatcher("/admin/managecoursesUrl").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }

这是一个基于 Java Servlet 技术实现的课程信息管理系统中的更新课程信息的控制器类。它接收一个 HTTP GET 请求，从请求参数中获取需要更新的课程的 ISBN 编号、书名、教师姓名等信息，然后创建一个 Courses 对象并...

@WebServlet("/scoreUrl") public class ScoreController extends HttpServlet { private static final long serialVersionUID = 1L; public ScoreController() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // ScoreService scoreService = new ScoreService(); // StudentService studentService = new StudentService(); // User user = (User) request.getSession().getAttribute("loginUser"); // List<StudentScoreDto> scores = scoreService.getScoreListByStudentNo(user.getStudentNo()); // // Student student = studentService.getStudentByNo(user.getStudentNo()); // request.setAttribute("student", student); // request.setAttribute("scores", scores); CoursesService coursesSerice = new CoursesService(); User user = (User) request.getSession().getAttribute("loginUser"); List<Courses> courses = coursesSerice.getCourseList(); request.setAttribute("courses", courses); request.getRequestDispatcher("/WEB-INF/pages/score.jsp").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }

这是一个Java Servlet，其中定义了一个名为ScoreController的类。该类继承了HttpServlet类，实现了doGet和doPost方法。在doGet方法中，它首先实例化了一个CoursesService对象，并通过调用getCoursesList方法获取了...

package servlet; import db.Database; import module.admin; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; @WebServlet(name = "viewServlet",urlPatterns = "/view") public class viewServlet extends HttpServlet { private static final long serialVersionUID = 1L; private static final String SQL = "select s_id, password from admin"; // 从连接池获取连接 Connection connection = null; PreparedStatement statement = null; ResultSet resultSet = null; ArrayList<admin> admins = new ArrayList<>(); protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { try { connection = Database.getConnection(); statement = connection.prepareStatement(SQL); resultSet = statement.executeQuery(); System.out.println("连接成功"); while (resultSet.next()) { int s_id = resultSet.getInt("s_id"); String password = resultSet.getString("password"); admin admin = new admin(s_id, password); admins.add(admin); req.setAttribute("message", "数据读取成功"); } req.setAttribute("admins", admins); req.getRequestDispatcher("view.jsp").forward(req, resp); } catch (SQLException e) { e.printStackTrace(); req.setAttribute("message", "操作失败!"); } finally { Database.closeResource(connection, statement, resultSet); } } }

private static final long serialVersionUID = 1L; private static final String SQL = "select s_id, password from admin"; // SQL 查询语句 Connection connection = null; PreparedStatement statement = ...

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