Redis integrates Springboot (RedisConfig and RedisUtils)

Springboot integrates Redis

fundamental analysis

Jedis was replaced by lettuce after Springboot2.x

jedis: It is unsafe to use direct connection and use multiple threads to operate. If you want to avoid insecurity, you need to use jedis pool connection pool

lettuce: using netty, the instance can be shared among multiple threads, there is no thread insecurity, and the number of threads can be reduced

Source code analysis

@Configuration(proxyBeanMethods = false)
@ConditionalOnClass({
    
    RedisOperations.class})
@EnableConfigurationProperties({
    
    RedisProperties.class})
@Import({
    
    LettuceConnectionConfiguration.class, JedisConnectionConfiguration.class})
public class RedisAutoConfiguration {
    
    
  public RedisAutoConfiguration() {
    
    
  }

  //默认的 RedisTemplate 没有过多的设置，redis 对象都是需要序列化！
  //两个泛型都是<Object, Object>类型，我们后续使用需要强制转换<String,Object>
  @Bean
  @ConditionalOnMissingBean(name = {
    
    "redisTemplate"})   //可以自定义一个替换
  @ConditionalOnSingleCandidate(RedisConnectionFactory.class)
  public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
    
    
    RedisTemplate<Object, Object> template = new RedisTemplate();
    template.setConnectionFactory(redisConnectionFactory);
    return template;
  }

  @Bean
  @ConditionalOnMissingBean
  @ConditionalOnSingleCandidate(RedisConnectionFactory.class)
  //由于 String 类型是最常用的类型，所以单独提出来一个 bean
  public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory) {
    
    
    StringRedisTemplate template = new StringRedisTemplate();
    template.setConnectionFactory(redisConnectionFactory);
    return template;
  }
}

test use

1. import dependencies

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

2. Configure connection application.properties

   See what you can configure by yourself (org.springframework.boot.autoconfigure.data.redis.RedisProperties)

   #redis
   spring.redis.host=127.0.0.1
   spring.redis.port=6379
   

3. test

   @SpringBootTest
   public class RedisTest {
         
         
   
       @Autowired
       private RedisTemplate redisTemplate;
   
       @Test
       public void test(){
         
         
           User user = new User();
           user.setNickname("tom");
           redisTemplate.opsForValue().set("user",user);
           System.out.println(redisTemplate.opsForValue().get("user"));
       }
   }
   

Serialization

The default serialization method is JDK serialization, we may use Json to serialize

RedisConfig

package com.tong.snfarming.config;

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.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
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 Tomyee
 * @Date 2023-07-20 09:34
 * @blog https://blog.csdn.net/Xiao_tongtong
 **/
@Configuration
public class RedisConfig {
    
    

  //自定义 redisTemplate
  @Bean
  public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
    
    

    RedisTemplate<String, Object> template = new RedisTemplate();

    template.setConnectionFactory(redisConnectionFactory);

    // 定义 Json 序列化
    Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
    // Json 转换工具
    ObjectMapper om = new ObjectMapper();
    om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
    om.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL);
    jackson2JsonRedisSerializer.setObjectMapper(om);
    // 定义 String 序列化
    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;
  }
}

RedisUtil

package com.tong.snfarming.utils;

/**
 * @Author Tomyee
 * @Date 2023-07-20 10:09
 * @blog https://blog.csdn.net/Xiao_tongtong
 **/
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import javax.annotation.Resource;
import java.util.*;
import java.util.concurrent.TimeUnit;
/**
 * Redis 工具类
 *
 * @author LiaoHang
 * @date 2022-06-09 22:15
 */
@Component
public class RedisUtil {
    
    
  @Resource
  private RedisTemplate<String, Object> redisTemplate;
  // =============================Common 基础============================
  /**
     * 指定缓存失效时间
     *
     * @param key  键
     * @param time 时间(秒)
     */
  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) {
    
    
    // 如果返回值为 null，则返回 0L
    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 Boolean.TRUE.equals(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((Collection<String>) CollectionUtils.arrayToList(key));
      }
    }
  }
  // ============================String 字符串=============================
  /**
     * 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)
     */
  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)
     */
  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);
  }
  // ===============================List 列表=================================
  /**
     * 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
     */
  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
     */
  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
     */
  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
     */
  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)
     */
  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 赋值结果
     */
  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 赋值结果
     */
  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 赋值结果
     */
  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 {
    
    
      return redisTemplate.opsForList().remove(key, count, value);
    } catch (Exception e) {
    
    
      e.printStackTrace();
      return 0;
    }
  }
  // ============================Set 集合=============================
  /**
     * 根据key获取Set中的所有值
     *
     * @param key 键
     */
  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
     */
  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 {
    
    
      return redisTemplate.opsForSet().remove(key, values);
    } catch (Exception e) {
    
    
      e.printStackTrace();
      return 0;
    }
  }
  // ================================Hash 哈希=================================
  /**
     * HashGet
     *
     * @param key  键 不能为null
     * @param item 项 不能为null
     */
  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
     */
  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)
     */
  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)
     */
  public double hdecr(String key, String item, double by) {
    
    
    return redisTemplate.opsForHash().increment(key, item, -by);
  }
}

test use

import com.tong.snfarming.entity.User;
import com.tong.snfarming.utils.RedisUtil;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;

/**
 * @Author Tomyee
 * @Date 2023-07-19 11:18
 * @blog https://blog.csdn.net/Xiao_tongtong
 **/
@SpringBootTest
public class RedisTest {
    
    

    @Autowired
    //指定使用我们自己编写的redisTemplate
    @Qualifier("redisTemplate")
    private RedisTemplate redisTemplate;

    @Autowired
    private RedisUtil redisUtil;

    @Test
    public void test(){
    
    
        User user = new User();
        user.setNickname("tom");

        redisTemplate.opsForValue().set("user",user);
        System.out.println(redisTemplate.opsForValue().get("user"));
    }
    @Test
    public void test1(){
    
    
        redisUtil.set("name","tomyee");
        System.out.println(redisUtil.get("name"));

    }
}