spring-boot redis基于API的缓存实现

最新推荐文章于 2024-06-26 12:12:50 发布

zc888168

最新推荐文章于 2024-06-26 12:12:50 发布

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分类专栏： spring-boot redis

本文链接：https://blog.youkuaiyun.com/zc888168/article/details/105005238

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3 篇文章

订阅专栏

本文介绍如何在Spring Boot项目中整合Redis作为缓存，包括依赖配置、实体类序列化、缓存方法实现及API调用流程。通过具体代码示例展示了数据的读取、更新和删除操作，并说明了如何利用注解@Cacheable、@CachePut、@CacheEvict进行缓存管理。

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1 dependency

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

2 application.properties


#Redis服务连接配置
#Redis服务地址
spring.redis.host=127.0.0.1
#Redis服务器连接端口
spring.redis.port=6379
#Redis服务器连接密码
spring.redis.password=

3 repository

public interface CommentRepository extends JpaRepository<Comment, Integer> {

    //根据评论id修改评论作者

    @Transactional
    @Modifying
    @Query(value = "update t_comment c set c.author = ?1 where  c.id=?2", nativeQuery = true)
    public int updateComment(String author, Integer id);

}

4 service

@Cacheable @CachePut @CacheEvict

import com.demo.pojo.Comment;
import com.demo.repository.CommentRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Optional;
import java.util.concurrent.TimeUnit;

@Service
public class ApiCommentService {

    @Autowired
    private CommentRepository commentRepository;

    @Autowired
    private RedisTemplate redisTemplate;


    // 使用API方式进行缓存：先去缓存中查找，缓存中有，直接返回，没有，查询数据库
    public Comment findCommentById(Integer id){
        Object o = redisTemplate.opsForValue().get("comment_" + id);
        if(o!=null){
            //查询到了数据，直接返回
            return (Comment) o;
        }else {
            //缓存中没有，从数据库查询
            Optional<Comment> byId = commentRepository.findById(id);
            if(byId.isPresent()){
                Comment comment = byId.get();
                //将查询结果存到缓存中，同时还可以设置有效期为1天
                redisTemplate.opsForValue().set("comment_" + id,comment,1, TimeUnit.DAYS);
                return  comment;
            }


        }

        return  null;
    }



    //更新方法
    public Comment updateComment(Comment comment){
        commentRepository.updateComment(comment.getAuthor(),comment.getId());
        //将更新数据进行缓存更新
        redisTemplate.opsForValue().set("comment_" + comment.getId(),comment);
        return comment;
    }

    //删除方法
    public void deleteComment(Integer id){
        commentRepository.deleteById(id);
        redisTemplate.delete("comment_" + id);
    }

}

5 controller

import com.demo.pojo.Comment;
import com.demo.service.ApiCommentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("api")
public class ApiCommentController {

    @Autowired
    private ApiCommentService commentService;


    @RequestMapping("/findCommentById")
    public Comment findCommentById(Integer id){
        Comment comment = commentService.findCommentById(id);
        return  comment;

    }

    @RequestMapping("/updateComment")
    public Comment updateComment(Comment comment){
        Comment commentById = commentService.findCommentById(comment.getId());
        commentById.setAuthor(comment.getAuthor());
        Comment comment1 = commentService.updateComment(commentById);
        return comment1;
    }

    @RequestMapping("/deleteComment")
    public void deleteComment(Integer id){
        commentService.deleteComment(id);
    }





}

6 缓存对象序列化

@Entity
@Table(name = "t_comment")
public class Comment implements Serializable {

7 序列化Configuration

@Configuration
public class RedisConfig {

    // 自定义一个RedisTemplate

    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(redisConnectionFactory);

        // 创建JSON格式序列化对象，对缓存数据的key和value进行转换
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);


        // 解决查询缓存转换异常的问题
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);

        jackson2JsonRedisSerializer.setObjectMapper(om);

        //设置redisTemplate模板API的序列化方式为json
        template.setDefaultSerializer(jackson2JsonRedisSerializer);


        return template;
    }

redis-cli 不能查看中文：
参考： https://blog.youkuaiyun.com/tongtongsong/article/details/88363194

8 启动类

//@EnableCaching // 开启spring boot基于注解的缓存管理支持
@SpringBootApplication
public class SpringbootDemoApplication {

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

}

9 测试

http://127.0.0.1:8080/api/findCommentById?id=1
点多次

Hibernate: select comment0_.id as id1_0_0_, comment0_.a_id as a_id2_0_0_, comment0_.author as author3_0_0_, comment0_

10 更新测试

http://localhost:8080/api/updateComment?id=1&author=abcd
然后
http://127.0.0.1:8080/api/findCommentById?id=1

Hibernate: update t_comment c set c.author = ? where  c.id=?

11 删除测试

http://localhost:8080/api/deleteComment?id=1
缓存数据库均被删除

Hibernate: delete from t_comment where id=?