feat: Spring Boot 学习脚手架 v2.0
- 新增 IoC 容器学习模块 - 新增 AOP 切面编程学习模块 - 新增 MyBatis 集成学习模块 - 新增事务管理学习模块 - 新增用户/产品/订单 CRUD - 新增 7 个交互式学习页面 - 集成性能监控切面
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likingcode
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src/main/java/com/example/scaffold/service/UserService.java
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src/main/java/com/example/scaffold/service/UserService.java
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package com.example.scaffold.service;
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import com.example.scaffold.entity.User;
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import java.util.List;
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import java.util.Optional;
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/**
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* 用户服务接口 - 演示接口与实现分离
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*/
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public interface UserService {
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List<User> findAll();
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Optional<User> findById(Long id);
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User save(User user);
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void deleteById(Long id);
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List<User> searchByUsername(String username);
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long count();
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}
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package com.example.scaffold.service.impl;
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import com.example.scaffold.entity.Order;
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import com.example.scaffold.entity.Product;
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import com.example.scaffold.mapper.OrderMapper;
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import com.example.scaffold.mapper.ProductMapper;
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import com.example.scaffold.mapper.UserMapper;
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import lombok.RequiredArgsConstructor;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Isolation;
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import org.springframework.transaction.annotation.Propagation;
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import org.springframework.transaction.annotation.Transactional;
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import java.math.BigDecimal;
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import java.util.List;
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/**
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* 订单服务 - 演示事务传播和隔离级别
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*
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* 学习要点：
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* 1. 事务传播行为 - Propagation
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* 2. 事务隔离级别 - Isolation
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* 3. 事务回滚 - rollbackFor
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*/
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@Slf4j
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@Service
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@RequiredArgsConstructor
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public class OrderService {
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private final OrderMapper orderMapper;
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private final ProductMapper productMapper;
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private final UserMapper userMapper;
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/**
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* 创建订单 - 演示事务
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* REQUIRED: 有事务则加入，无则新建
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*/
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@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
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public Order createOrder(Long userId, Long productId, Integer quantity) {
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log.info("📦 [OrderService] 创建订单: userId={}, productId={}, quantity={}", userId, productId, quantity);
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// 检查用户
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if (userMapper.findById(userId) == null) {
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throw new RuntimeException("用户不存在: " + userId);
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}
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// 检查产品
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Product product = productMapper.findById(productId);
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if (product == null) {
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throw new RuntimeException("产品不存在: " + productId);
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}
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// 扣减库存
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int rows = productMapper.decreaseStock(productId, quantity);
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if (rows == 0) {
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throw new RuntimeException("库存不足");
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}
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// 创建订单
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Order order = new Order();
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order.setUserId(userId);
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order.setProductId(productId);
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order.setQuantity(quantity);
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order.setTotalPrice(product.getPrice().multiply(BigDecimal.valueOf(quantity)));
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order.setStatus("PENDING");
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orderMapper.insert(order);
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log.info("✅ [OrderService] 订单创建成功: orderId={}", order.getId());
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return order;
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}
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/**
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* 模拟事务回滚
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*/
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@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
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public Order createOrderWithRollback(Long userId, Long productId, Integer quantity, boolean shouldRollback) {
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log.info("📦 [OrderService] 创建订单(可能回滚): userId={}, shouldRollback={}", userId, shouldRollback);
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Order order = createOrder(userId, productId, quantity);
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if (shouldRollback) {
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log.warn("⚠️ [OrderService] 触发回滚!");
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throw new RuntimeException("模拟事务回滚");
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}
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return order;
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}
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/**
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* REQUIRES_NEW - 挂起当前事务，创建新事务
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*/
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@Transactional(propagation = Propagation.REQUIRES_NEW)
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public void logOrderOperation(Long orderId, String operation) {
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log.info("📝 [OrderService] 记录订单操作: orderId={}, operation={}", orderId, operation);
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// 这个方法会在独立事务中执行
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// 即使外部事务回滚，这里的记录也会保留
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}
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/**
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* 使用隔离级别 READ_COMMITTED
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*/
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@Transactional(isolation = Isolation.READ_COMMITTED)
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public Order getOrder(Long id) {
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return orderMapper.findById(id);
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}
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public List<Order> findAll() {
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return orderMapper.findAll();
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}
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public List<Order> findByUserId(Long userId) {
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return orderMapper.findByUserId(userId);
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}
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@Transactional
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public void updateStatus(Long id, String status) {
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orderMapper.updateStatus(id, status);
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}
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@Transactional
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public void deleteById(Long id) {
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orderMapper.deleteById(id);
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}
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}
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package com.example.scaffold.service.impl;
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import com.example.scaffold.entity.User;
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import com.example.scaffold.mapper.UserMapper;
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import com.example.scaffold.service.UserService;
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import lombok.RequiredArgsConstructor;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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import java.util.List;
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import java.util.Optional;
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/**
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* 用户服务实现 - 演示 Spring 服务层
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*
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* 学习要点：
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* 1. @Service - 标记为服务组件
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* 2. @Transactional - 声明式事务
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* 3. @RequiredArgsConstructor - Lombok 构造器注入
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* 4. @Slf4j - Lombok 日志
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*/
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@Slf4j
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@Service
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@RequiredArgsConstructor
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public class UserServiceImpl implements UserService {
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private final UserMapper userMapper;
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@Override
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public List<User> findAll() {
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log.info("📊 [UserService] 查询所有用户");
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return userMapper.findAll();
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}
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@Override
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public Optional<User> findById(Long id) {
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log.info("🔍 [UserService] 查询用户: id={}", id);
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// 演示 MyBatis 一级缓存 - 连续两次查询
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User user = userMapper.findById(id);
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User cached = userMapper.findById(id); // 第二次会命中缓存
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if (cached != null) {
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log.info("✅ [UserService] 一级缓存命中: id={}", id);
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}
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return Optional.ofNullable(user);
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}
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@Override
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@Transactional
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public User save(User user) {
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log.info("💾 [UserService] 保存用户: {}", user.getUsername());
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if (user.getId() == null) {
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userMapper.insert(user);
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} else {
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userMapper.update(user);
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}
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return user;
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}
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@Override
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@Transactional
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public void deleteById(Long id) {
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log.info("🗑️ [UserService] 删除用户: id={}", id);
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userMapper.deleteById(id);
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}
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@Override
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public List<User> searchByUsername(String username) {
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log.info("🔎 [UserService] 搜索用户: username={}", username);
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return userMapper.findByUsernameLike(username);
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}
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@Override
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public long count() {
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return userMapper.count();
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}
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}
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