本文介绍下SpringBoot整合SpringDataJPA后加入缓存组件Ehcache的操作。

SpringBoot整合Ehcache

创建SpringBoot项目及依赖

  创建一个SpringBoot项目，添加如下依赖。

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

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.32</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.14</version>
    </dependency>
    <dependency>
        <groupId>error</groupId>
        <artifactId>spring-boot-starter-cache</artifactId>
    </dependency>
    <dependency>
        <groupId>net.sf.ehcache</groupId>
        <artifactId>ehcache</artifactId>
    </dependency>
</dependencies>

  

 

  
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添加相关配置

  添加Ehcache的配置文件和application.properties

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
         updateCheck="false">

    <diskStore path="java.io.tmpdir"/>
    <!--defaultCache:echcache 的默认缓存策略 -->
    <defaultCache
            maxElementsInMemory="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>

  

 

  
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application.properties

# mysql 的相关连接信息
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
# 关联Ehcache的配置文件
spring.cache.ehcache.cofnig=ehcache.xml

  

 

  
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添加pojo文件

/**
 * @program: springboot-ehcache
 * @description: 用户对应的实体类
 * @author: 波波烤鸭
 * @create: 2019-05-17 11:22
 */
@Entity
@Table(name="users")
public class User implements Serializable {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="userid")
    private Integer userid;

    @Column(name="username")
    private String username;

    @Column(name="userage")
    private Integer userage;

    public Integer getUserid() {
        return userid;
    }

    public void setUserid(Integer userid) {
        this.userid = userid;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Integer getUserage() {
        return userage;
    }

    public void setUserage(Integer userage) {
        this.userage = userage;
    }

    @Override
    public String toString() {
        return "User{" +
                "userid=" + userid +
                ", username='" + username + '\'' +
                ", userage=" + userage +
                '}';
    }
}

  

 

  
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Dao接口

  创建Dao接口并继承JpaRepository

/**
 * @program: springboot-ehcache
 * @description: 持久层实现Jpa
 * @author: 波波烤鸭
 * @create: 2019-05-17 11:25
 */
public interface UsersRepository extends JpaRepository<User,Integer> {
    
}

  

 

  
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业务层

public interface UserService {
    List<User> findUserAll();
    User findUserById(Integer id);
    Page<User> findUserByPage(Pageable pageable);
    void saveUsers(User users);
}

  

 

  
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/**
 * @program: springboot-ehcache
 * @description: 业务层实现类
 * @author: 波波烤鸭
 * @create: 2019-05-17 11:27
 */
@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UsersRepository usersRepository;

    @Override
    @Cacheable(value="users")
    public List<User> findUserAll() {
        return this.usersRepository.findAll();
    }

    @Override
    //@Cacheable:对当前查询的对象做缓存处理
    @Cacheable(value="users")
    public User findUserById(Integer id) {
        return this.usersRepository.findById(id).get();
    }

    @Override
    @Cacheable(value="users",key="#pageable.pageSize")
    public Page<User> findUserByPage(Pageable pageable) {
        return this.usersRepository.findAll(pageable);
    }

    @Override
    //@CacheEvict(value="users",allEntries=true) 清除缓存中以users缓存策略缓存的对象
    @CacheEvict(value="users",allEntries=true)
    public void saveUsers(User users) {
        this.usersRepository.save(users);
    }
}

  

 

  
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单元测试

@RunWith(SpringRunner.class)
@SpringBootTest(classes = {SpringbootEhcacheApplication.class})
public class SpringbootEhcacheApplicationTests {

    @Resource
    private UserService userService;

    @Test
    //@Transactional
    //@Rollback(false)//取消自动回滚
    public void contextLoads() {
        //第一次查询
        System.out.println(this.userService.findUserById(6));
        //第二次查询
        System.out.println(this.userService.findUserById(6));
    }

    @Test
    public void testFindUserByPage(){
        Pageable pageable = new PageRequest(0, 2);
        //第一次查询
        System.out.println(this.userService.findUserByPage(pageable).getTotalElements());

        //第二次查询
        System.out.println(this.userService.findUserByPage(pageable).getTotalElements());

        //第三次查询
        pageable = new PageRequest(1, 2);
        System.out.println(this.userService.findUserByPage(pageable).getTotalElements());
    }

    @Test
    public void testFindAll(){
        //第一次查询
        System.out.println(this.userService.findUserAll().size());
        User users = new User();
        users.setUsername("bobo kaoya");
        users.setUserage(22);
        this.userService.saveUsers(users);
        //第二次查询
        System.out.println(this.userService.findUserAll().size());
    }
}

  

 

  
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文章来源: dpb-bobokaoya-sm.blog.csdn.net，作者：波波烤鸭，版权归原作者所有，如需转载，请联系作者。

原文链接：dpb-bobokaoya-sm.blog.csdn.net/article/details/90374285