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How SpringBoot integrates Redis to use RedisRepositories

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Release: 2023-05-26 12:50:28
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    SpringBoot integrates Redis

    1. Add redis dependency

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-pool2</artifactId>
    </dependency>
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    2. Add redis configuration information in application.properties

    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(默认为空)
    spring.redis.password=
    # 连接池最大连接数(使用负值表示没有限制)
    spring.redis.lettuce.pool.max-active=8
    # 连接池最大阻塞等待时间(使用负值表示没有限制)
    spring.redis.lettuce.pool.max-wait=-1
    # 连接池中的最大空闲连接
    spring.redis.lettuce.pool.max-idle=8
    # 连接池中的最小空闲连接
    spring.redis.lettuce.pool.min-idle=0
    # 连接超时时间(毫秒)
    spring.redis.timeout=30000
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    3. Add annotation configuration to SpringBoot startup class

    @EnableCaching
    @EnableRedisRepositories
    //注解开启使用RedisRepositories
    //CRUD操作将会操作redis中的数据
    @SpringBootApplication
    public class RedisApplication {
     
        public static void main(String[] args) {
            SpringApplication.run(RedisApplication.class, args);
        } 
    }
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    4. Create entity class Entity

    @Data
    @RedisHash("user")
    //RedisHash非常重要
    //user表示在redis中新建user集合
    //之后所有的UserEntity的保存操作全部会保存在user这个集合中
    //保存时Key的格式为——user:id
    public class UserEntity{
        @Id
        private Long id; 
        private String name; 
        private Integer age; 
        private Date createTime = new Date();
    }
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    5. Create Dao layer——data operation layer

    @Repository
    public interface UserDao extends CrudRepository<UserEntity,Long> {
    }
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    6. Create Service layer - Service layer

    @Service
    public class UserService {
     
        @Autowired
        private UserDao userDao;
     
    //因为使用了RedisRepositories,所以简单的crud将不用使用RedisTemplate
    //    @Autowired
    //    private RedisTemplate redisTemplate; 
     
        /**
         * 按user:id的方式存入redis
         * @param user
         */
        public void save(UserEntity user){
            //redisTemplate.opsForValue().set(new Random().nextDouble() + "",user); 
            userDao.save(user); 
        }
     
        /**
         * 根据key从redis中查找对应value
         * @param id
         * @return
         */
        public UserEntity findOne(Long id){ 
            //UserEntity user = (UserEntity) redisTemplate.opsForValue().get(key); 
            UserEntity user = userDao.findById(id).get(); 
            return user;
        }
    }
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    7. Create Controller layer - Control layer

    @RestController
    @RequestMapping("user")
    public class UserController {
     
        @Autowired
        private UserService userService;
     
        /**
         * 保存到redis中
         * @return
         */
        @GetMapping("save")
        public String save(){
     
            UserEntity user = new UserEntity(); 
            user.setName(String.valueOf(new Random().nextInt(100000))); 
            user.setAge(new Random().nextInt(100000)); 
            userService.save(user); 
            System.out.println(user.toString()); 
            return "success";
        }
     
        /**
         * 根据key从redis中查找value
         * @param id
         * @return
         */
        @GetMapping("find/{id}")
        public String find(@PathVariable Long id){
           UserEntity user = userService.findOne(id);
     
            System.out.println(user);
            return "success";
        }
    }
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    8.redis configuration class

    @Configuration
    public class RedisConfig {
     
        @Bean
        public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
            RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
            template.setConnectionFactory(factory);
            Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
            ObjectMapper om = new ObjectMapper();
            om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
            om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
            jackson2JsonRedisSerializer.setObjectMapper(om);
            StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
            // key采用String的序列化方式
            template.setKeySerializer(stringRedisSerializer);
            // hash的key也采用String的序列化方式
            template.setHashKeySerializer(stringRedisSerializer);
            // value序列化方式采用jackson
            template.setValueSerializer(jackson2JsonRedisSerializer);
            // hash的value序列化方式采用jackson
            template.setHashValueSerializer(jackson2JsonRedisSerializer);
            template.afterPropertiesSet();
            return template;
        }
    }
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    The structure in Redis is

    How SpringBoot integrates Redis to use RedisRepositories

    redis encapsulation tool class

    @Component
    public class RedisUtils {
     
    	@Autowired
    	private RedisTemplate<String, Object> redisTemplate;
     
    	// =============================common============================
     
    	/**
    	 * 指定缓存失效时间
    	 *
    	 * @param key  键
    	 * @param time 时间(秒)
    	 * @return
    	 */
    	public boolean expire(String key, long time) {
    		try {
    			if (time > 0) {
    				redisTemplate.expire(key, time, TimeUnit.SECONDS);
    			}
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 根据key 获取过期时间
    	 *
    	 * @param key 键 不能为null
    	 * @return 时间(秒) 返回0代表为永久有效
    	 */
    	public long getExpire(String key) {
    		return redisTemplate.getExpire(key, TimeUnit.SECONDS);
    	}
     
    	/**
    	 * 判断key是否存在
    	 *
    	 * @param key 键
    	 * @return true 存在 false不存在
    	 */
    	public boolean hasKey(String key) {
    		try {
    			return redisTemplate.hasKey(key);
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 删除缓存
    	 *
    	 * @param key 可以传一个值 或多个
    	 */
    	@SuppressWarnings("unchecked")
    	public void del(String... key) {
    		if (key != null && key.length > 0) {
    			if (key.length == 1) {
    				redisTemplate.delete(key[0]);
    			} else {
    				redisTemplate.delete(CollectionUtils.arrayToList(key));
    			}
    		}
    	}
    	// ============================String=============================
     
    	/**
    	 * 普通缓存获取
    	 *
    	 * @param key 键
    	 * @return 值
    	 */
    	public  Object get(String key) {
    		return key == null ? null : redisTemplate.opsForValue().get(key);
    	}
     
    	/**
    	 * 普通缓存放入
    	 *
    	 * @param key   键
    	 * @param value 值
    	 * @return true成功 false失败
    	 */
    	public boolean set(String key, Object value) {
    		try {
    			redisTemplate.opsForValue().set(key, value);
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 普通缓存放入并设置时间
    	 *
    	 * @param key   键
    	 * @param value 值
    	 * @param time  时间(秒) time要大于0 如果time小于等于0 将设置无限期
    	 * @return true成功 false 失败
    	 */
    	public boolean set(String key, Object value, long time) {
    		try {
    			if (time > 0) {
    				redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
    			} else {
    				set(key, value);
    			}
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 递增
    	 *
    	 * @param key   键
    	 * @param delta 要增加几(大于0)
    	 * @return
    	 */
    	public long incr(String key, long delta) {
    		if (delta < 0) {
    			throw new RuntimeException("递增因子必须大于0");
    		}
    		return redisTemplate.opsForValue().increment(key, delta);
    	}
     
    	/**
    	 * 递减
    	 *
    	 * @param key   键
    	 * @param delta 要减少几(小于0)
    	 * @return
    	 */
    	public long decr(String key, long delta) {
    		if (delta < 0) {
    			throw new RuntimeException("递减因子必须大于0");
    		}
    		return redisTemplate.opsForValue().increment(key, -delta);
    	}
    	// ================================Map=================================
     
    	/**
    	 * HashGet
    	 *
    	 * @param key  键 不能为null
    	 * @param item 项 不能为null
    	 * @return 值
    	 */
    	public Object hget(String key, String item) {
    		return redisTemplate.opsForHash().get(key, item);
    	}
     
    	/**
    	 * 获取hashKey对应的所有键值
    	 *
    	 * @param key 键
    	 * @return 对应的多个键值
    	 */
    	public Map<Object, Object> hmget(String key) {
    		return redisTemplate.opsForHash().entries(key);
    	}
     
    	/**
    	 * HashSet
    	 *
    	 * @param key 键
    	 * @param map 对应多个键值
    	 * @return true 成功 false 失败
    	 */
    	public boolean hmset(String key, Map<String, Object> map) {
    		try {
    			redisTemplate.opsForHash().putAll(key, map);
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * HashSet 并设置时间
    	 *
    	 * @param key  键
    	 * @param map  对应多个键值
    	 * @param time 时间(秒)
    	 * @return true成功 false失败
    	 */
    	public boolean hmset(String key, Map<String, Object> map, long time) {
    		try {
    			redisTemplate.opsForHash().putAll(key, map);
    			if (time > 0) {
    				expire(key, time);
    			}
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 向一张hash表中放入数据,如果不存在将创建
    	 *
    	 * @param key   键
    	 * @param item  项
    	 * @param value 值
    	 * @return true 成功 false失败
    	 */
    	public boolean hset(String key, String item, Object value) {
    		try {
    			redisTemplate.opsForHash().put(key, item, value);
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 向一张hash表中放入数据,如果不存在将创建
    	 *
    	 * @param key   键
    	 * @param item  项
    	 * @param value 值
    	 * @param time  时间(秒) 注意:如果已存在的hash表有时间,这里将会替换原有的时间
    	 * @return true 成功 false失败
    	 */
    	public boolean hset(String key, String item, Object value, long time) {
    		try {
    			redisTemplate.opsForHash().put(key, item, value);
    			if (time > 0) {
    				expire(key, time);
    			}
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 删除hash表中的值
    	 *
    	 * @param key  键 不能为null
    	 * @param item 项 可以使多个 不能为null
    	 */
    	public void hdel(String key, Object... item) {
    		redisTemplate.opsForHash().delete(key, item);
    	}
     
    	/**
    	 * 判断hash表中是否有该项的值
    	 *
    	 * @param key  键 不能为null
    	 * @param item 项 不能为null
    	 * @return true 存在 false不存在
    	 */
    	public boolean hHasKey(String key, String item) {
    		return redisTemplate.opsForHash().hasKey(key, item);
    	}
     
    	/**
    	 * hash递增 如果不存在,就会创建一个 并把新增后的值返回
    	 *
    	 * @param key  键
    	 * @param item 项
    	 * @param by   要增加几(大于0)
    	 * @return
    	 */
    	public double hincr(String key, String item, double by) {
    		return redisTemplate.opsForHash().increment(key, item, by);
    	}
     
    	/**
    	 * hash递减
    	 *
    	 * @param key  键
    	 * @param item 项
    	 * @param by   要减少记(小于0)
    	 * @return
    	 */
    	public double hdecr(String key, String item, double by) {
    		return redisTemplate.opsForHash().increment(key, item, -by);
    	}
    	// ============================set=============================
     
    	/**
    	 * 根据key获取Set中的所有值
    	 *
    	 * @param key 键
    	 * @return
    	 */
    	public Set<Object> sGet(String key) {
    		try {
    			return redisTemplate.opsForSet().members(key);
    		} catch (Exception e) {
    			e.printStackTrace();
    			return null;
    		}
    	}
     
    	/**
    	 * 根据value从一个set中查询,是否存在
    	 *
    	 * @param key   键
    	 * @param value 值
    	 * @return true 存在 false不存在
    	 */
    	public boolean sHasKey(String key, Object value) {
    		try {
    			return redisTemplate.opsForSet().isMember(key, value);
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 将数据放入set缓存
    	 *
    	 * @param key    键
    	 * @param values 值 可以是多个
    	 * @return 成功个数
    	 */
    	public long sSet(String key, Object... values) {
    		try {
    			return redisTemplate.opsForSet().add(key, values);
    		} catch (Exception e) {
    			e.printStackTrace();
    			return 0;
    		}
    	}
     
    	/**
    	 * 将set数据放入缓存
    	 *
    	 * @param key    键
    	 * @param time   时间(秒)
    	 * @param values 值 可以是多个
    	 * @return 成功个数
    	 */
    	public long sSetAndTime(String key, long time, Object... values) {
    		try {
    			Long count = redisTemplate.opsForSet().add(key, values);
    			if (time > 0)
    				expire(key, time);
    			return count;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return 0;
    		}
    	}
     
    	/**
    	 * 获取set缓存的长度
    	 *
    	 * @param key 键
    	 * @return
    	 */
    	public long sGetSetSize(String key) {
    		try {
    			return redisTemplate.opsForSet().size(key);
    		} catch (Exception e) {
    			e.printStackTrace();
    			return 0;
    		}
    	}
     
    	/**
    	 * 移除值为value的
    	 *
    	 * @param key    键
    	 * @param values 值 可以是多个
    	 * @return 移除的个数
    	 */
    	public long setRemove(String key, Object... values) {
    		try {
    			Long count = redisTemplate.opsForSet().remove(key, values);
    			return count;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return 0;
    		}
    	}
    	// ===============================list=================================
     
    	/**
    	 * 获取list缓存的内容
    	 *
    	 * @param key   键
    	 * @param start 开始
    	 * @param end   结束 0 到 -1代表所有值
    	 * @return
    	 */
    	public List<Object> lGet(String key, long start, long end) {
    		try {
    			return redisTemplate.opsForList().range(key, start, end);
    		} catch (Exception e) {
    			e.printStackTrace();
    			return null;
    		}
    	}
     
    	/**
    	 * 获取list缓存的长度
    	 *
    	 * @param key 键
    	 * @return
    	 */
    	public long lGetListSize(String key) {
    		try {
    			return redisTemplate.opsForList().size(key);
    		} catch (Exception e) {
    			e.printStackTrace();
    			return 0;
    		}
    	}
     
    	/**
    	 * 通过索引 获取list中的值
    	 *
    	 * @param key   键
    	 * @param index 索引 index>=0时, 0 表头,1 第二个元素,依次类推;index<0时,-1,表尾,-2倒数第二个元素,依次类推
    	 * @return
    	 */
    	public Object lGetIndex(String key, long index) {
    		try {
    			return redisTemplate.opsForList().index(key, index);
    		} catch (Exception e) {
    			e.printStackTrace();
    			return null;
    		}
    	}
     
    	/**
    	 * 将list放入缓存
    	 *
    	 * @param key   键
    	 * @param value 值
    	 * @return
    	 */
    	public boolean lSet(String key, Object value) {
    		try {
    			redisTemplate.opsForList().rightPush(key, value);
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 将list放入缓存
    	 *
    	 * @param key   键
    	 * @param value 值
    	 * @param time  时间(秒)
    	 * @return
    	 */
    	public boolean lSet(String key, Object value, long time) {
    		try {
    			redisTemplate.opsForList().rightPush(key, value);
    			if (time > 0)
    				expire(key, time);
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 将list放入缓存
    	 *
    	 * @param key   键
    	 * @param value 值
    	 * @return
    	 */
    	public boolean lSet(String key, List<Object> value) {
    		try {
    			redisTemplate.opsForList().rightPushAll(key, value);
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 将list放入缓存
    	 *
    	 * @param key   键
    	 * @param value 值
    	 * @param time  时间(秒)
    	 * @return
    	 */
    	public boolean lSet(String key, List<Object> value, long time) {
    		try {
    			redisTemplate.opsForList().rightPushAll(key, value);
    			if (time > 0)
    				expire(key, time);
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 根据索引修改list中的某条数据
    	 *
    	 * @param key   键
    	 * @param index 索引
    	 * @param value 值
    	 * @return
    	 */
    	public boolean lUpdateIndex(String key, long index, Object value) {
    		try {
    			redisTemplate.opsForList().set(key, index, value);
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
     
    	/**
    	 * 移除N个值为value
    	 *
    	 * @param key   键
    	 * @param count 移除多少个
    	 * @param value 值
    	 * @return 移除的个数
    	 */
    	public long lRemove(String key, long count, Object value) {
    		try {
    			Long remove = redisTemplate.opsForList().remove(key, count, value);
    			return remove;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return 0;
    		}
    	}
    }
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