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;

@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

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