苍穹外卖--缓存菜品Spring Cache

Spring Cache是一个框架，实现了基于注解的缓存功能，只需要简单地加一个注解，就能实现缓存功能。

Spring Cache提供了一层抽象，底层可以切换不同的缓存实现，例如：

①EHCache

②Caffeine

③Redis

常用注解：

代码开发：

package com.itheima.controller;import com.itheima.entity.User;
import com.itheima.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.web.bind.annotation.*;@RestController
@RequestMapping("/user")
@Slf4j
public class UserController {@Autowiredprivate UserMapper userMapper;@PostMapping@CachePut(cacheNames = "userCache",key="#user.id")//如果使用Spring Cache缓存数据，key的生成：userCache::1public User save(@RequestBody User user){userMapper.insert(user);return user;}@DeleteMapping@CacheEvict(cacheNames = "userCache",key = "#id")public void deleteById(Long id){userMapper.deleteById(id);}@DeleteMapping("/delAll")@CacheEvict(cacheNames = "userCache",allEntries = true)public void deleteAll(){userMapper.deleteAll();}@GetMapping@Cacheable(cacheNames = "userCache",key = "#id")//key的生成：userCache::10public User getById(Long id){User user = userMapper.getById(id);return user;}}