Spring Boot缓存实战 默认Cache（ConcurrentMapCacheManager）

Spring boot默认使用的是SimpleCacheConfiguration，即使用ConcurrentMapCacheManager来实现缓存。

pom文件

    
        org.springframework.boot
        spring-boot-starter-web
    

    
        org.springframework.boot
        spring-boot-starter-data-jpa
    

    
        mysql
        mysql-connector-java
    

    
        org.apache.commons
        commons-dbcp2
    

关键Service

package com.xiaolyuh.service.impl;

import com.xiaolyuh.entity.Person;
import com.xiaolyuh.repository.PersonRepository;
import com.xiaolyuh.service.PersonService;
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.stereotype.Service;

@Service
public class PersonServiceImpl implements PersonService {
    @Autowired
    PersonRepository personRepository;

    @Override
    @CachePut(value = "people", key = "#person.id")
    public Person save(Person person) {
        Person p = personRepository.save(person);
        System.out.println("为id、key为:" + p.getId() + "数据做了缓存");
        return p;
    }

    @Override
    @CacheEvict(value = "people")//2
    public void remove(Long id) {
        System.out.println("删除了id、key为" + id + "的数据缓存");
        //这里不做实际删除操作
    }

    @Override
    @Cacheable(value = "people", key = "#person.id")//3
    public Person findOne(Person person) {
        Person p = personRepository.findOne(person.getId());
        System.out.println("为id、key为:" + p.getId() + "数据做了缓存");
        return p;
    }
}

Controller

package com.xiaolyuh.controller;

import com.xiaolyuh.entity.Person;
import com.xiaolyuh.service.PersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class CacheController {

    @Autowired
    PersonService personService;

    @RequestMapping("/put")
    public long put(@RequestBody Person person) {
        Person p = personService.save(person);
        return p.getId();
    }

    @RequestMapping("/able")
    public Person cacheable(Person person) {

        return personService.findOne(person);
    }

    @RequestMapping("/evit")
    public String evit(Long id) {

        personService.remove(id);
        return "ok";
    }

}

启动类

@SpringBootApplication
@EnableCaching// 开启缓存，需要显示的指定
public class SpringBootStudentCacheApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootStudentCacheApplication.class, args);
    }
}

测试类

package com.xiaolyuh;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

import java.util.HashMap;
import java.util.Map;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.MediaType;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;

import net.minidev.json.JSONObject;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBootStudentCacheApplicationTests {

    @Test
    public void contextLoads() {
    }

    private MockMvc mockMvc; // 模拟MVC对象，通过MockMvcBuilders.webAppContextSetup(this.wac).build()初始化。

    @Autowired
    private WebApplicationContext wac; // 注入WebApplicationContext  

//    @Autowired  
//    private MockHttpSession session;// 注入模拟的http session  
//      
//    @Autowired  
//    private MockHttpServletRequest request;// 注入模拟的http request\  

    @Before // 在测试开始前初始化工作  
    public void setup() {
        this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();
    }

    @Test
    public void testAble() throws Exception {
        for (int i = 0; i < 2; i++) {
            MvcResult result = mockMvc.perform(post("/able").param("id", "2"))
                    .andExpect(status().isOk())// 模拟向testRest发送get请求
                    .andExpect(content().contentType(MediaType.APPLICATION_JSON_UTF8))// 预期返回值的媒体类型text/plain;
                    // charset=UTF-8
                    .andReturn();// 返回执行请求的结果

            System.out.println(result.getResponse().getContentAsString());
        }
    }

}

打印日志

image

从上面可以看出第一次走的是数据库，第二次走的是缓存

源码：
https://github.com/wyh-spring-ecosystem-student/spring-boot-student/tree/releases

spring-boot-student-cache 工程

为监控而生的多级缓存框架 layering-cache这是我开源的一个多级缓存框架的实现，如果有兴趣可以看一下