springboot 整合EHcache 实现缓存技术

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一 ehcache的概述

1.@Cacheable注解的作用

@Cacheable 对当前的对象做缓存处理

@Cacheable
public List<Users> findUserAll() {return this.userRepository.findAll();
}@Cacheable 作用：把方法的返回值添加到 Ehcache 中做缓存 Value 属性：指定一个 Ehcache 配置文件中的缓存策略，如果没有给定 value，那么则表示使用默认的缓存策略
@Cacheable(value = "users")
public List<Users> findUserAll() {return this.userRepository.findAll();
}

key的作用：给存储的值起个名称，在查询时如果有名称相同时，则从已知的名称中取值。否则从数据库中查询数据。

配置文件设置缓存策略：

注意事项：缓存的对象必须实现序列化

二操作案例

2.1.新建项目配置pom文件

加配置依赖：

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

<dependency>
<groupId>org.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>3.1.2</version>
</dependency>

    <dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13</version><scope>test</scope></dependency><!-- springBoot的启动器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- springBoot的thymeleaf启动器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><!-- springBoot的jpa启动器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><!-- 测试工具的启动器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency><!-- mysql --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!-- druid连接池 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.9</version></dependency><!-- Spring Boot缓存支持启动器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-cache</artifactId></dependency><!-- Ehcache坐标 --><dependency><groupId>org.ehcache</groupId><artifactId>ehcache</artifactId><version>3.1.2</version></dependency>

2.2 dao层

package com.ljf.spring.boot.demo.dao;import com.ljf.spring.boot.demo.model.Users;
import org.springframework.data.jpa.repository.JpaRepository;/*** 参数一 T :当前需要映射的实体* 参数二 ID :当前映射的实体中的OID的类型**/
public interface UserRepository extends JpaRepository<Users,Integer> {}

2.3.model层

注意users要实现序列化

package com.ljf.spring.boot.demo.model;import javax.persistence.*;
import java.io.Serializable;/*** @ClassName: Users* @Description: TODO* @Author: liujianfu* @Date: 2020/09/02 08:50:18 * @Version: V1.0**/@Entity@Table(name="tb_users_tb")public class Users implements Serializable {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)@Column(name = "id")private Integer id;@Column(name = "name")private String name;@Column(name = "age")private Integer age;@Column(name = "address")private String address;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return "Users [id=" + id + ", name=" + name + ", age=" + age + ", address=" + address + "]";}
}

2.4.service层

public interface UserService {List<Users> findUserAll();
}package com.ljf.spring.boot.demo.service.impl;import com.ljf.spring.boot.demo.dao.UserRepository;
import com.ljf.spring.boot.demo.model.Users;
import com.ljf.spring.boot.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;import java.util.List;/*** @ClassName: UserServiceImpl* @Description: TODO* @Author: liujianfu* @Date: 2020/09/02 08:57:11 * @Version: V1.0**/
@Service
public class UserServiceImpl  implements UserService {@Autowiredprivate UserRepository userRepository;@Override//@Cacheable 对当前的对象做缓存处理//@Cacheable(value = "users")public List<Users> findUserAll() {return this.userRepository.findAll();}}

2.5.配置文件

2.5.1 application配置文件

在配置文件中引入缓存的配置文件：
spring.cache.ehcache.cofnig=ehcache.xml

spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test_db
spring.datasource.username=root
spring.datasource.password=rootspring.datasource.type=com.alibaba.druid.pool.DruidDataSourcespring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=truespring.cache.ehcache.cofnig=ehcache.xml

2.5.2 ehcache.xml配置文件

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../config/ehcache.xsd"><diskStore path="java.io.tmpdir"/><!--defaultCache:echcache的默认缓存策略  --><defaultCachemaxElementsInMemory="10000"eternal="false"timeToIdleSeconds="120"timeToLiveSeconds="120"maxElementsOnDisk="10000000"diskExpiryThreadIntervalSeconds="120"memoryStoreEvictionPolicy="LRU"><persistence strategy="localTempSwap"/></defaultCache><!-- 自定义缓存策略 --><cache name="users"maxElementsInMemory="10000"eternal="false"timeToIdleSeconds="120"timeToLiveSeconds="120"maxElementsOnDisk="10000000"diskExpiryThreadIntervalSeconds="120"memoryStoreEvictionPolicy="LRU"><persistence strategy="localTempSwap"/></cache>
</ehcache>

2.6 启动类和测试类

启动类上添加，开启缓存的注解@EnableCaching

package com.ljf.spring.boot.demo;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;/*** Hello world!**/
@SpringBootApplication
@EnableCaching
public class StartApp
{public static void main( String[] args ){SpringApplication.run(StartApp.class, args);System.out.println( "Hello World!" );}
}

package com.ljf.spring.boot.demo;import static org.junit.Assert.assertTrue;import com.ljf.spring.boot.demo.model.Users;
import com.ljf.spring.boot.demo.service.UserService;
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.test.context.junit4.SpringJUnit4ClassRunner;import java.util.List;/*** Unit test for simple App.*/
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes={StartApp.class})   //springboot的启动类
public class AppTest 
{@Autowiredprivate UserService us;/*** Rigorous Test :-)*/@Testpublic void query(){List<Users> list=us.findUserAll();System.out.println("第一次:"+list.get(0).getAddress());List<Users> list2=us.findUserAll();System.out.println("第2次:"+list2.get(0).getAddress());}
}