Spring Boot入门样例-230-guava-cache整合Guava Caching缓存数据

每次都读取数据库非常慢，对于相同的查询，我们可以使用缓存。本demo演示如何使用guava和@CachePut 和 @Cacheable缓存数据。

前言

本Spring Boot入门样例准备工作参考：

• Spring Boot入门样例-001-Java和Maven安装配置
• Spring Boot入门样例-003-idea 安装配置和插件
• Spring Boot入门样例-005-如何运行

相关功能

• 如果想查看Ehcache做缓存，请查看Spring Boot入门样例-120-ehcache-cache整合Ehcache Caching缓存数据
• 如果想查看Guava做缓存，请查看Spring Boot入门样例-230-guava-cache整合Guava Caching缓存数据
• 如果想查看Redis做缓存，请查看Spring Boot入门样例-301-redis-cache使用Redis Caching缓存数据

pox.xml

必要的依赖如下，具体参见该项目的pox.xml

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>25.1-jre</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.3.7.RELEASE</version>
</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.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>

配置文件

resources/application.yml配置内容

spring:
datasource:
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/springbootdemo?useUnicode=true&characterEncoding=utf-8&useSSL=false&useAffectedRows=true
username: root
password: root
jpa:
show-sql: true
generate-ddl: true
hibernate:
ddl-auto: update
properties:
hibernate:
dialect: org.hibernate.dialect.MySQL55Dialect

代码解析

其他代码解析参考 spring-boot-demo-040-jpa 模块。

GuavaConfig.java 如下

@Configuration
public class GuavaConfig {
/**
* spring缓存配置，使用guava
* @author Funson
* @date 2019/10/24
* @return
*/
@Bean
public CacheManager cacheManager(){
GuavaCacheManager cacheManager = new GuavaCacheManager();
// 设置过期时间为7200秒
cacheManager.setCacheBuilder(CacheBuilder.newBuilder().expireAfterWrite(7200, TimeUnit.SECONDS));
return cacheManager;
}
}

StudentServiceImpl.java 如下 @CachePut 和 @Cacheable都会将数据缓存到guava中

@Slf4j
@Service
public class StudentServiceImpl implements StudentService {
@Autowired
StudentDao studentDao;
@Override
public List<Student> index() {
return studentDao.findAll();
}
@Override
@CachePut(value = "student", key = "#student.id")
public Student save(Student student) {
log.info("inser to mysql: " + student.getId());
return studentDao.save(student);
}
@Override
@Cacheable(value = "student", key = "#id")
public Optional<Student> findById(String id) {
log.info("find from mysql: " + id);
return studentDao.findById(id);
}
}

SpringBootDemo230GuavaCacheApplication.java 要加上@EnableCaching

@SpringBootApplication
@EnableCaching
public class SpringBootDemo230GuavaCacheApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootDemo230GuavaCacheApplication.class, args);
}
}

运行

点击运行

浏览器访问 http://localhost:8080/student/
[Student(id=381159203135426560, name=funson, age=30), Student(id=381159203135926560, name=zhonghua, age=26), Student(id=382624532634144768, name=funson, age=30), Student(id=382624644089384960, name=zhonghua, age=28), Student(id=384105379728068608, name=jack, age=25)]
浏览器访问 http://localhost:8080/student/view/381159203135426560
控制台日志:
2019-10-24 09:51:38.130
INFO 12920 --- [nio-8080-exec-1] c.f.s.service.impl.StudentServiceImpl
: find from mysql: 381159203135426560
Hibernate: select student0_.id as id1_0_0_, student0_.age as age2_0_0_, student0_.name as name3_0_0_ from student student0_ where student0_.id=?
表示从数据库里查询
浏览器再次访问 http://localhost:8080/student/view/381159203135426560
没有日志，表示从guava缓存中读取
浏览器访问 http://localhost:8080/student/add/funsonli1/29
Student(id=384426023674056704, name=funsonli1, age=29)
浏览器访问 http://localhost:8080/student/view/384426023674056704
浏览器访问 http://localhost:8080/student/delete/384426023674056704
清除缓存

参考

• Spring Boot入门样例源代码地址 https://github.com/funsonli/spring-boot-demo
• Bootan源代码地址 https://github.com/funsonli/bootan

附

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