Redis工具类封装

依赖

项目是springboot 项目。加上gson 和redis 的依赖如下

      <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

yml文件配置

spring:
  redis:
    open: true  # 是否开启redis缓存  true开启   false关闭
    host: 127.0.0.1
    database: 0
    password: 123456
    port: 6379
    jedis:
      pool:
        max-active: 1000  # 连接池最大连接数（使用负值表示没有限制）
        max-idle: 10      # 连接池中的最大空闲连接
        min-idle: 5

redis 配置类

@Configuration
public class RedisConfig {

    @Autowired
    private RedisConnectionFactory factory;

    @Bean
    public RedisTemplate<String, Object> redisTemplate() {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new StringRedisSerializer());
        redisTemplate.setConnectionFactory(factory);
        return redisTemplate;
    }

    @Bean
    public HashOperations<String, String, Object> hashOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForHash();
    }

    @Bean
    public ValueOperations<String, String> valueOperations(RedisTemplate<String, String> redisTemplate) {
        return redisTemplate.opsForValue();
    }

    @Bean
    public ListOperations<String, Object> listOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForList();
    }

    @Bean
    public SetOperations<String, Object> setOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForSet();
    }

    @Bean
    public ZSetOperations<String, Object> zSetOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForZSet();
    }

}

redis 工具类

@Component
public class RedisUtil {
    /**
     * 是否开启redis缓存  true开启   false关闭
     */
    @Value("${spring.redis.open: #{false}}")
    private boolean open;

    @Autowired(required = false)
    private RedisTemplate<String, Object> redisTemplate;
    @Autowired(required = false)
    private ValueOperations<String, String> valueOperations;
    @Autowired(required = false)
    private HashOperations<String, String, Object> hashOperations;
    @Autowired(required = false)
    private ListOperations<String, Object> listOperations;
    @Autowired(required = false)
    private SetOperations<String, Object> setOperations;
    @Autowired(required = false)
    private ZSetOperations<String, Object> zSetOperations;

    /**
     * 默认过期时长，单位：秒
     */
    public final static long DEFAULT_EXPIRE = 7200;

    /**
     * 不设置过期时长
     */
    public final static long NOT_EXPIRE = -1;
    public final static Gson gson = new GsonBuilder().setPrettyPrinting().serializeNulls().disableHtmlEscaping()
            .create();

    public boolean exists(String key) {
        if (!open) {
            return false;
        }

        return redisTemplate.hasKey(key);
    }

    public void set(String key, Object value, long expire) {
        if (!open) {
            return;
        }
        try {
            valueOperations.set(key, toJson(value));

        } catch (Exception e0) {
            System.out.println(e0.getMessage());
        }
        if (expire != NOT_EXPIRE) {
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
    }

    public void set(String key, Object value) {
        if (!open) {
            return;
        }
        try {

            valueOperations.set(key, toJson(value));

        } catch (Exception e0) {
            System.out.println(e0.getMessage());
        }
    }

    public <T> T get(String key, Class<T> clazz, long expire) {
        if (!open) {
            return null;
        }

        String value = valueOperations.get(key);
        if (expire != NOT_EXPIRE) {
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
        return value == null ? null : fromJson(value, clazz);
    }

    public <T> T get(String key, Class<T> clazz) {
        if (!open) {
            return null;
        }

        return get(key, clazz, NOT_EXPIRE);
    }

    public String get(String key, long expire) {
        if (!open) {
            return null;
        }

        String value = valueOperations.get(key);
        if (expire != NOT_EXPIRE) {
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
        return value;
    }

    public String get(String key) {
        if (!open) {
            return null;
        }

        return get(key, NOT_EXPIRE);
    }

    public void delete(String key) {
        if (!open) {
            return;
        }

        if (exists(key)) {
            redisTemplate.delete(key);
        }
    }

    public void delete(String... keys) {
        if (!open) {
            return;
        }

        for (String key : keys) {
            redisTemplate.delete(key);
        }
    }

    public void deletePattern(String pattern) {
        if (!open) {
            return;
        }

        Set<String> keys = redisTemplate.keys(pattern);
        if (keys.size() > 0) {
            redisTemplate.delete(keys);
        }
    }

    /**
     * Object转成JSON数据
     */
    private String toJson(Object object) {
        if (!open) {
            return null;
        }

        if (object instanceof Integer || object instanceof Long || object instanceof Float ||
                object instanceof Double || object instanceof Boolean || object instanceof String) {
            return String.valueOf(object);
        }

        return gson.toJson(object);
    }

    /**
     * JSON数据，转成Object
     */
    private <T> T fromJson(String json, Class<T> clazz) {
        if (!open) {
            return null;
        }

        return gson.fromJson(json, clazz);
    }

}