SpringBoot集成Redis

2024-06-13 1611阅读

Redis基本命令：https://blog.csdn.net/HJW_233/article/details/131902164

参考文章：https://www.jianshu.com/p/cb6fb8f8bb83

1. 引入pom

  
      org.springframework.boot
      spring-boot-starter-data-redis

2. 增加配置

spring:
  redis:
    host: 127.0.0.1
    port: 6379
    password: 123456

3. 自定义序列化

TODO: list 存储的对象还是存储的字节数组？

如果不自定义自定义序列化方式的话，查看缓存数据的时候是字节数组，看不懂！

OMS系统的配置

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import java.time.Duration;
/**
 * redis配置
 *
 * @author 
 * @date 2021/12/7 3:07 下午
 */
@Configuration
@EnableCaching
public class RedisConfig {
    /**
     * 长时过期时间（秒）
     */
    private static final int REDIS_LONG_EXPIRATION = 86400 * 5; // 24小时 * 5 = 5天
    /**
     * 定义长时的缓存器
     *
     * @return
     */
    @Bean(name = "longLifeCacheManager")
    public CacheManager longLifeCacheManager(RedisConnectionFactory factory) {
        RedisSerializer redisSerializer = new StringRedisSerializer();
        // 配置序列化（解决乱码的问题）,过期时间600秒
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofSeconds(REDIS_LONG_EXPIRATION))
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(this.getJacksonRedisSerializer()))
                .disableCachingNullValues();
        RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
                .cacheDefaults(config)
                .build();
        return cacheManager;
    }
    /**
     * redisTemplate
     *
     * @param
     * @return org.springframework.data.redis.core.RedisTemplate
     * @author xiefengsong
     * @date 2020/4/26 9:57 上午
     */
    @Bean
    RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate template = new RedisTemplate();
        //连接工厂
        template.setConnectionFactory(redisConnectionFactory);
        //序列化
        Jackson2JsonRedisSerializer serializer = this.getJacksonRedisSerializer();
        template.setValueSerializer(serializer);
        //使用StringRedisSerializer来序列化和反序列化redis的key值
        template.setKeySerializer(new StringRedisSerializer());
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setHashValueSerializer(serializer);
        template.afterPropertiesSet();
        return template;
    }
    /**
     * 配置序列化
     *
     * @param
     * @return org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer
     * @author xiefengsong
     * @date 2020/4/26 9:43 上午
     */
    private Jackson2JsonRedisSerializer getJacksonRedisSerializer() {
        //使用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值
        Jackson2JsonRedisSerializer serializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper mapper = new ObjectMapper();
        mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        //采用的是自由放任所有的通行
        mapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL);
        serializer.setObjectMapper(mapper);
        return serializer;
    }
}

参考文章的配置：

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
/**
 * 

 *
 * 

 *
 * @author tianjiaxin
 * @createTime 2024/6/3 11:27
 * @Description:
 */
@Configuration
@EnableCaching
public class RedisConfig {
    @Bean("redisTemplate")
    public RedisTemplate initRedisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate redisTemplate = new RedisTemplate();
        // 设置连接工厂
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        // 定义 String 序列化器
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        // 定义 Jackson 序列化器
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper objectMapper = new ObjectMapper();
        //反序列化时智能识别变量名（识别没有按驼峰格式命名的变量名）
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        //反序列化识别对象类型
        objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
//        objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.WRAPPER_ARRAY);
        //反序列化如果有多的属性，不抛出异常
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        //反序列化如果碰到不识别的枚举值，是否作为空值解释，true:不会抛不识别的异常, 会赋空值，false:会抛不识别的异常
        objectMapper.configure(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL, true);
        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
        // 设置 Redis 的 key 以及 hash 结构的 field 使用 String 序列化器
        redisTemplate.setKeySerializer(stringRedisSerializer);
        redisTemplate.setHashKeySerializer(stringRedisSerializer);
        // 设置 Redis 的 value 以及 hash 结构的 value 使用 Jackson 序列化器
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
        redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }
}

4. 基本类型操作

package com.tjx.service.impl;
import com.tjx.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.core.BoundSetOperations;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.SessionCallback;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import java.util.List;
/**
 * 

 *
 * 

 *
 * @author tianjiaxin
 * @createTime 2024/6/3 14:20
 * @Description:
 */
@Service
public class MyRedisServiceImpl {
    @Autowired
    RedisTemplate redisTemplate;
    @Autowired
    StringRedisTemplate stringRedisTemplate;
    // 基本操作
    public void test1() {
        stringRedisTemplate.opsForValue().set("srt", "StringRedisTemplate");
        redisTemplate.opsForValue().set("test1", new User(1L, "tjx", 18));
        redisTemplate.opsForSet().add("set", "1", "2");
        Boolean member = redisTemplate.opsForSet().isMember("set", "1");
        System.out.println("==========" + member);
        redisTemplate.opsForList().leftPush("list", new User(2L, "小明", 19));
        redisTemplate.opsForList().leftPush("list", new User(3L, "小红", 19));
        redisTemplate.opsForList().rightPop("list");
    }
    // 对一个key多次操作
    public void test2() {
        BoundSetOperations bound = redisTemplate.boundSetOps("bound");
        bound.add("1");
        bound.add("2");
    }
    // 事务
    public void test3() {
        stringRedisTemplate.opsForValue().set("stock", "1000");
        List results = stringRedisTemplate.execute(new SessionCallback() {
            @Override
            public  List execute(RedisOperations redisOperations) throws DataAccessException {
                // 监控库存
                redisOperations.watch((K) "stock");
                // 获取库存
                int stock = Integer.parseInt(String.valueOf(redisOperations.opsForValue().get("stock")));
                // 如果库存在于购买数量，则库存构建，否则返回null
                if (stock > 10) {
                    stock -= 10;
                } else {
                    redisOperations.unwatch();
                    return null;
                }
                // 开启事务
                redisOperations.multi();
                // 扣减库存
                redisOperations.opsForValue().set((K) "stock", (V) String.valueOf(stock));
                // 执行事务
                List exec = redisOperations.exec();
                return exec;
            }
        });
        if (results == null || results.size() == 0) {
            System.out.println("库存扣减失败！");
        } else {
            System.out.println("剩余库存：" + stringRedisTemplate.opsForValue().get("stock"));
        }
    }
    // pipeline 多个命令批量发送都服务器上，减少网络传输
    public void test4() {
        stringRedisTemplate.executePipelined(new SessionCallback() {
            @Override
            public  Object execute(RedisOperations redisOperations) throws DataAccessException {
                stringRedisTemplate.opsForValue().set("pipeline1", "1");
                stringRedisTemplate.opsForValue().set("pipeline2", "2");
                stringRedisTemplate.opsForValue().set("pipeline3", "3");
                return null;
            }
        });
    }
}

5. 搭配注解自动写入缓存

注意：在配置文件中添加@EnableCaching注解，其他配置还有依赖不需要添加

cacheNames：相当于key的前缀，含义是缓存存储的名称

SpringBoot集成Redis

  • @CacheConfig，在类上使用，表示该类中方法使用的缓存名称（可以理解为数据缓存的命名空间），除了在类上使用该注解配置缓存名称，还可以用下边三个注解在方法上配置
  • @CachePut，一般用在新增或更新业务的方法上，当数据新增或更新成功后，将方法的返回结果使用指定的 key 添加到缓存中，或更新缓存中已有的 key 的值
  • @Cacheable，一般用在查询业务的方法上，先从缓存中根据指定的 key 查询数据，如果查询到就直接返回，否则执行该方法来获取数据，最后将方法的返回结果保存到缓存
  • @CacheEvict，一般用在删除业务的方法上，默认会在方法执行结束后移除指定 key 对应的缓存数据 
    package com.tjx.service.impl;
import com.tjx.dao.entity.StudentsDO;
import com.tjx.dao.mapper.StudentsMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheConfig;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
/**
 * 
    
 *
 * 
    
 *
 * @author tianjiaxin
 * @createTime 2024/6/3 17:18
 * @Description:
 */
@Service
@CacheConfig(cacheNames = "studentSercieImpl")
public class StudentServiceImpl {
    @Autowired
    StudentsMapper studentsMapper;
    @Cacheable(cacheNames = "getStudentsById", key = "'student' + #id")
    public StudentsDO getStudentsById(Integer id) {
        return studentsMapper.selectById(id);
    }
    @CachePut(key = "'student' + #studentsDO.id")
    public StudentsDO addStudents(StudentsDO studentsDO) {
        studentsMapper.insert(studentsDO);
        return studentsDO;
    }
    @CachePut(key = "'student' + #studentsDO.id", condition = "#result != 'null'")
    public StudentsDO updateStudents(StudentsDO studentsDO) {
        if (studentsDO == null) return null;
        studentsMapper.updateById(studentsDO);
        return studentsDO;
    }
    @CacheEvict(cacheNames = "delete", key = "'student' + #id")
    public Integer deleteUserById(Integer id) {
        return studentsMapper.deleteById(id);
    }
}

    6. 基本操作工具类

    package com.xiaomi.mit.oms.order.components.cache.manager;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import java.io.Serializable;
import java.util.*;
import java.util.concurrent.TimeUnit;
@Slf4j
@Component
public class RedisManager {
    @Autowired
    private RedisTemplate redisTemplate;
    public boolean expire(String key, long time) {
        try {
            if (time > 0) {
                redisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
            return true;
        } catch (Exception e) {
            log.error("[Redis] 设置key过期时间异常, key:{}, time:{}", key, time, e);
            return false;
        }
    }
    public long getExpire(String key) {
        return redisTemplate.getExpire(key, TimeUnit.SECONDS);
    }
    public boolean hasKey(String key) {
        try {
            return redisTemplate.hasKey(key);
        } catch (Exception e) {
            log.warn("[Redis] 查询key值异常, key:{}", key, e);
            return false;
        }
    }
    public boolean delete(String key) {
        return redisTemplate.delete(key);
    }
    public void delete(String... key) {
        if (key != null && key.length > 0) {
            if (key.length == 1) {
                redisTemplate.delete(key[0]);
            } else {
                redisTemplate.delete(CollectionUtils.arrayToList(key));
            }
        }
    }
    /**
     * 根据pattern删除
     *
     * @param pattern
     */
    public void deleteByPattern(String pattern) {
        Set keys = redisTemplate.keys(pattern);
        if (keys != null && keys.size() > 0) {
            redisTemplate.delete(keys);
        }
    }
    public List mGet(Collection keys) {
        return redisTemplate.opsForValue().multiGet(keys);
    }
    public Object get(String key) {
        return key == null ? null : redisTemplate.opsForValue().get(key);
    }
    /**
     * 普通缓存获取
     *
     * @param key 键
     * @return 值
     */
    public String getString(String key) {
        return key == null ? null : (String) redisTemplate.opsForValue().get(key);
    }
    public boolean set(String key, Object value) {
        try {
            redisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            log.error("[Redis] set设置key值异常, key:{}, value:{}", key, value, e);
            return false;
        }
    }
    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) {
            log.error("[Redis] set设置key值异常, key:{}, value:{}, time:{}", key, value, time, e);
            return false;
        }
    }
    public boolean setNx(String key, Object value, long time) {
        if (time  0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            log.error("[Redis] Map设置异常, key:{}, map:{}, time:{}", key, map, time, e);
            return false;
        }
    }
    public boolean hmSet(String key, String item, Object value) {
        try {
            redisTemplate.opsForHash().put(key, item, value);
            return true;
        } catch (Exception e) {
            log.error("[Redis] Map设置字段值异常, key:{}, item:{}, value:{}", key, item, value, e);
            return false;
        }
    }
    public boolean hmSet(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) {
            log.error("[Redis] Map设置字段值异常, key:{}, item:{}, value:{}, time:{}", key, item, value, time, e);
            return false;
        }
    }
    public void hmDelete(String key, Object... item) {
        redisTemplate.opsForHash().delete(key, item);
    }
    public boolean hmHasKey(String key, String item) {
        return redisTemplate.opsForHash().hasKey(key, item);
    }
    public double hmIncr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, by);
    }
    public double hmDecr(String key, String item, double by) {
        return redisTemplate.opsForHash().increment(key, item, -by);
    }
    // ============================set=============================
    public Set sGet(String key) {
        try {
            return redisTemplate.opsForSet().members(key);
        } catch (Exception e) {
            log.error("[Redis] 根据key值获取Set异常, key:{}", key, e);
            return Collections.emptySet();
        }
    }
    public boolean sHasKey(String key, Object value) {
        try {
            return redisTemplate.opsForSet().isMember(key, value);
        } catch (Exception e) {
            log.error("[Redis] 根据key查询Set中是否存在value值异常, key:{}, value:{}", key, value, e);
            return false;
        }
    }
    public long sSet(String key, Object... values) {
        try {
            return redisTemplate.opsForSet().add(key, values);
        } catch (Exception e) {
            log.error("[Redis] 根据key查询Set中是否存在多个value值异常, key:{}, value:{}", key, values, e);
            return 0;
        }
    }
    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) {
            log.error("[Redis] Set设置多个值并设置过期时间异常, key:{}, value:{}, time:{}", key, values, time, e);
            return 0;
        }
    }
    public long sGetSetSize(String key) {
        try {
            return redisTemplate.opsForSet().size(key);
        } catch (Exception e) {
            log.error("[Redis] Set根据key值查询size异常, key:{}", key, e);
            return 0;
        }
    }
    public long setRemove(String key, Object... values) {
        try {
            return redisTemplate.opsForSet().remove(key, values);
        } catch (Exception e) {
            log.error("[Redis] Set根据key删除多个value异常, key:{}, value:{}", key, values, e);
            return 0L;
        }
    }
    public List lGet(String key, long start, long end) {
        try {
            return redisTemplate.opsForList().range(key, start, end);
        } catch (Exception e) {
            log.error("[Redis] List根据key查询对象异常, key:{}, start:{}, end:{}", key, start, end, e);
            return Collections.emptyList();
        }
    }
    /**
     * 获取list缓存的内容,取出所有的值
     *
     * @param key 键
     * @return
     */
    public List lGet(String key) {
        try {
            return redisTemplate.opsForList().range(key, 0, -1);
        } catch (Exception e) {
            log.error("[Redis] List根据key查询对象异常, key:{}, start:{}, end:{}", key, 0, -1, e);
            return Collections.emptyList();
        }
    }
    public long lGetListSize(String key) {
        try {
            return redisTemplate.opsForList().size(key);
        } catch (Exception e) {
            log.error("[Redis] List根据key查询对象size异常, key:{}", key, e);
            return 0;
        }
    }
    public Object lGetIndex(String key, long index) {
        try {
            return redisTemplate.opsForList().index(key, index);
        } catch (Exception e) {
            log.error("[Redis] List根据key查询index对象异常, key:{}, index:{}", key, index, e);
            return null;
        }
    }
    public boolean rSet(String key, Object value) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            return true;
        } catch (Exception e) {
            log.error("[Redis] List right push对象异常, key:{}, value:{}", key, value, e);
            return false;
        }
    }
    public boolean rSet(String key, Object value, long time) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            log.error("[Redis] List right push对象异常, key:{}, value:{}, time:{}", key, value, time, e);
            return false;
        }
    }
    public boolean rSet(String key, List value) {
        try {
            redisTemplate.opsForList().rightPushAll(key, value);
            return true;
        } catch (Exception e) {
            log.error("[Redis] List right push list对象异常, key:{}, value:{}", key, value, e);
            return false;
        }
    }
    public boolean rSet(String key, List value, long time) {
        try {
            redisTemplate.opsForList().rightPushAll(key, value);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            log.error("[Redis] List right push list对象异常, key:{}, value:{}, time:{}", key, value, time, e);
            return false;
        }
    }
    public boolean lUpdateIndex(String key, long index, Object value) {
        try {
            redisTemplate.opsForList().set(key, index, value);
            return true;
        } catch (Exception e) {
            log.error("[Redis] List根据索引更新对象异常, key:{}, index:{}, value:{}", key, index, value, e);
            return false;
        }
    }
    public long lRemove(String key, long count, Object value) {
        try {
            return redisTemplate.opsForList().remove(key, count, value);
        } catch (Exception e) {
            log.error("[Redis] List 删除指定个数对象异常, key:{}, count:{}, value:{}", key, count, value, e);
            return 0;
        }
    }
}
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