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服务器之家 - 编程语言 - Java教程 - Spring Boot缓存实战 EhCache示例

Spring Boot缓存实战 EhCache示例

2020-12-16 11:31xiaolyuh Java教程

本篇文章主要介绍了Spring Boot缓存实战 EhCache示例,小编觉得挺不错的,现在分享给大家,也给大家做个参考。一起跟随小编过来看看吧

Spring boot默认使用的是SimpleCacheConfiguration,即使用ConcurrentMapCacheManager来实现缓存。但是要切换到其他缓存实现也很简单

pom文件

在pom中引入相应的jar包

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<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,只需要放到类路径下,Spring Boot会自动扫描。

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

也可以通过在application.properties文件中,通过配置来指定EhCache配置文件的位置,如:

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

Spring Boot会自动为我们配置EhCacheCacheMannager的Bean。

关键Service

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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

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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";
  }
 
}

启动类

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@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

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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

Spring Boot缓存实战 EhCache示例

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

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:http://www.jianshu.com/p/31e666f1ff57

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