SpringBoot使用@Cacheable注解实现缓存功能流程详解

@Configuration
public class CacheConfig{
	@Bean
	public KeyGenerator myKeyGenerator(){
		return (target,method,params)->method.getName();
	} 
}

package org.springframework.cache.interceptor;
import java.lang.reflect.Method;
/**
 * Cache key generator. Used for creating a key based on the given method
 * (used as context) and its parameters.
 *
 * @author Costin Leau
 * @author Chris Beams
 * @author Phillip Webb
 * @since 3.1
 */
@FunctionalInterface
public interface KeyGenerator {
	/**
	 * Generate a key for the given method and its parameters.
	 * @param target the target instance
	 * @param method the method being called
	 * @param params the method parameters (with any var-args expanded)
	 * @return a generated key
	 */
	Object generate(Object target, Method method, Object... params);
}

<dependency>
   <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-cache</artifactId>
</dependency>

package com.nezha.controller;
import com.nezha.entity.Area;
import com.nezha.service.area.AreaService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/area")
public class AreaController {
    @Autowired
    private AreaService areaService;
	// @Cacheable添加缓存，相同条件的查询不再查询数据库，而是从缓存中查询
    @Cacheable(cacheNames="area",key = "#id")
    @GetMapping("getAreaById")
    public Area getAreaById(Integer id) {
        return areaService.getAreaById(id);
    }
	// @CachePut每次都会访问数据库，并更新缓存
    @CachePut(cacheNames="area",key = "#id")
    @PostMapping("updateAreaById")
    public void updateAreaById(Integer id) {
        areaService.updateAreaById(id);
    }
	// @CacheEvict清除缓存
    @CacheEvict(cacheNames="area",key = "#id")
    @PostMapping("deleteAreaById")
    public void deleteAreaById(Integer id) {
        areaService.deleteAreaById(id);
    }
}