Spring Boot緩存實戰(zhàn) EhCache示例

更新時間：2017年08月14日 15:33:45 作者：xiaolyuh

本篇文章主要介紹了Spring Boot緩存實戰(zhàn) EhCache示例，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

Spring boot默認使用的是SimpleCacheConfiguration，即使用ConcurrentMapCacheManager來實現(xiàn)緩存。但是要切換到其他緩存實現(xiàn)也很簡單

pom文件

在pom中引入相應的jar包

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

  <dependency>
    <groupId>net.sf.ehcache</groupId>
    <artifactId>ehcache</artifactId>
  </dependency>

</dependencies>

配置文件

EhCache所需要的配置文件，只需要放到類路徑下，Spring Boot會自動掃描。

<?xml version="1.0" encoding="UTF-8"?>
<ehcache>
  <cache name="people" maxElementsInMemory="1000"/>
</ehcache>

也可以通過在application.properties文件中，通過配置來指定EhCache配置文件的位置，如：

spring.cache.ehcache.config= # ehcache配置文件地址

Spring Boot會自動為我們配置EhCacheCacheMannager的Bean。

關鍵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("為id、key為:" + p.getId() + "數(shù)據(jù)做了緩存");
    return p;
  }

  @Override
  @CacheEvict(value = "people")//2
  public void remove(Long id) {
    System.out.println("刪除了id、key為" + id + "的數(shù)據(jù)緩存");
    //這里不做實際刪除操作
  }

  @Override
  @Cacheable(value = "people", key = "#person.id")//3
  public Person findOne(Person person) {
    Person p = personRepository.findOne(person.getId());
    System.out.println("為id、key為:" + p.getId() + "數(shù)據(jù)做了緩存");
    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.cache.CacheManager;
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;

  @Autowired
  CacheManager cacheManager;

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

  @RequestMapping("/able")
  public Person cacheable(Person person) {
    System.out.println(cacheManager.toString());
    return personService.findOne(person);
  }

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

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

}

啟動類

@SpringBootApplication
@EnableCaching// 開啟緩存，需要顯示的指定
public class SpringBootStudentCacheApplication {

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

測試類

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; // 模擬MVC對象，通過MockMvcBuilders.webAppContextSetup(this.wac).build()初始化。

  @Autowired
  private WebApplicationContext wac; // 注入WebApplicationContext 

//  @Autowired 
//  private MockHttpSession session;// 注入模擬的http session 
//   
//  @Autowired 
//  private MockHttpServletRequest request;// 注入模擬的http request\ 

  @Before // 在測試開始前初始化工作 
  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())// 模擬向testRest發(fā)送get請求
          .andExpect(content().contentType(MediaType.APPLICATION_JSON_UTF8))// 預期返回值的媒體類型text/plain;
          // charset=UTF-8
          .andReturn();// 返回執(zhí)行請求的結果

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

}

打印日志