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

<dependencies>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-web</artifactId>    </dependency>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-data-jpa</artifactId>    </dependency>    <dependency>        <groupId>mysql</groupId>        <artifactId>mysql-connector-java</artifactId>    </dependency>    <dependency>        <groupId>org.apache.commons</groupId>        <artifactId>commons-dbcp2</artifactId>    </dependency></dependencies>

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;@Servicepublic 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;@RestControllerpublic 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)@SpringBootTestpublic 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

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