Maven项目数据库增删改查实战：详细代码示例及功能解析

{/'title/':/'Maven项目数据库增删改查实战：详细代码示例及功能解析/',/'description/':/'本文将详细介绍如何使用Maven构建一个Java项目，并实现对数据库的增删改查操作。文章内容包括项目结构、各包的功能、代码实现细节以及数据库连接配置等，并附带详细的注释，旨在帮助读者理解每个步骤的具体实现。/',/'keywords/':/'maven, java, 数据库, 增删改查, dao, entity, service, controller, servlet, jsp, 数据库连接, 依赖注入/',/'content/':/'//{/'src///'://{/'main///'://{/'java///'://{/'com///'://{/'example///'://{/'controller///'://{/'UserController.java///':///'package com.example.controller;//n//nimport com.example.entity.User;//nimport com.example.service.UserService;//n//nimport javax.servlet.ServletException;//nimport javax.servlet.http.HttpServlet;//nimport javax.servlet.http.HttpServletRequest;//nimport javax.servlet.http.HttpServletResponse;//nimport java.io.IOException;//n//npublic class UserController extends HttpServlet {//n private UserService userService; // UserService的实现类通过依赖注入方式注入//n//n public UserController(UserService userService) {//n this.userService = userService;//n }//n//n @Override//n protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//n Long id = Long.parseLong(request.getParameter(/'id/'));//n User user = userService.getUserById(id);//n request.setAttribute(/'user/', user);//n request.getRequestDispatcher(/'user.jsp/').forward(request, response);//n }//n}//n/'//n,///'dao///'://{/'UserDao.java///':///'package com.example.dao;//n//nimport com.example.entity.User;//n//npublic interface UserDao {//n void save(User user);//n void delete(Long id);//n void update(User user);//n User findById(Long id);//n}//n/'//n},/'entity///'://{/'User.java///':///'package com.example.entity;//n//npublic class User {//n private Long id;//n private String stuName;//n private Integer stuAge;//n private String stuSex;//n//n // 构造方法、getter和setter省略//n}//n/'//n},/'service///'://{/'UserService.java///':///'package com.example.service;//n//nimport com.example.entity.User;//n//npublic interface UserService {//n void saveUser(User user);//n void deleteUser(Long id);//n void updateUser(User user);//n User getUserById(Long id);//n}//n/',///'impl///'://{/'UserServiceImpl.java///':///'package com.example.service.impl;//n//nimport com.example.dao.UserDao;//nimport com.example.entity.User;//nimport com.example.service.UserService;//n//npublic class UserServiceImpl implements UserService {//n private UserDao userDao; // UserDao的实现类通过依赖注入方式注入//n//n public UserServiceImpl(UserDao userDao) {//n this.userDao = userDao;//n }//n//n @Override//n public void saveUser(User user) {//n userDao.save(user);//n }//n//n @Override//n public void deleteUser(Long id) {//n userDao.delete(id);//n }//n//n @Override//n public void updateUser(User user) {//n userDao.update(user);//n }//n//n @Override//n public User getUserById(Long id) {//n return userDao.findById(id);//n }//n}//n/'//n}//n},/'resources///'://{/'application.properties///':///'# 数据库连接配置//ndb.url=jdbc:mysql://localhost:3306/mydb//ndb.username=root//ndb.password=123456//n/'//n}//n}/