基于注解的Redis缓存实现

添加Spring Data Redis 依赖启动器
Redis服务连接配置
注入依赖
添加配置
使用@Cacheable、@CachePut、@CacheEvict注解定制缓存管理
将缓存对象实现序列化

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

spring.data.redis.host=127.0.0.1
spring.data.redis.port=6379
spring.data.redis.password=

// 使用注解定制缓存管理 @Cacheable @CachePut  @CacheEvict
import com.xy.demo.domain.Comment;
import com.xy.demo.repository.CommentRepository;
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;

import java.util.Optional;

@Service
public class CommentService {
    @Autowired
    private CommentRepository commentRepository;
    
    // 查询
    @Cacheable(cacheNames = "comment",unless = "#result==null") // 表示将方法的返回结果缓存到名为 "comment" 的缓存中
    public Comment findById(int comment_id){
        Optional<Comment> optional = commentRepository.findById(comment_id);
        if(optional.isPresent()){
            return optional.get();
        }
        return null;
    }
    // 更新
	@CachePut(cacheNames = "comment",key = "#result.id")
    public Comment updateComment(Comment comment){
        commentRepository.updateComment(comment.getAuthor(), comment.getaId());
        return comment;
    }
    // 删除
    @CacheEvict(cacheNames = "comment")
    public void deleteComment(int comment_id){
        commentRepository.deleteById(comment_id);
    }

}

// 将缓存对象实现序列化
import jakarta.persistence.*;

import java.io.Serializable;

@Entity(name = "t_comment")  
public class Comment implements Serializable {
    @Id   
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    private Integer id;
    private String content;
    private String author;
    @Column(name = "a_id")  
    private Integer aId;
}