• SpringBoot整合Redis


    SpringBoot整合

    在SpringBoot2.x之后,原来使用的Jedis被替换成了Lettuce

    Jedis:采用的直连,多个线程操作,是不安全的,如果想要避免需要使用Jedis pool连接池!更像 BIO

    Lettuce:采用entty,实例可以在多个线程中进行共享,不存在线程不安全的情况,可以减少线程数据,更像 NIO

    源码分析:

    RedisAutoConfiguration.java

    @Bean
    @ConditionalOnMissingBean(name = "redisTemplate") //可以自定义redisTemplate来替换默认的
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory)
          throws UnknownHostException {
        //默认的RedisTemplate没有过的设置,redis对象都是需要序列化的
        //两个泛型都是<Object, Object>的类型,使用的时候要强制转化<String, Object>
       RedisTemplate<Object, Object> template = new RedisTemplate<>();                 
       template.setConnectionFactory(redisConnectionFactory);
       return template;
    }
    
    @Bean
    @ConditionalOnMissingBean	//由于String 是Redis中常用的类型,所以单独设置一个Bean
    public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory)
          throws UnknownHostException {
       StringRedisTemplate template = new StringRedisTemplate();
       template.setConnectionFactory(redisConnectionFactory);
       return template;
    }
    

    整合测试

    • 导入依赖

      <!--Redis-->
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-data-redis</artifactId>
      </dependency>
      
    • 配置连接

      相关配置可以在RedisProperties类中查看

      # 配置Redis
      spring.redis.host=127.0.0.1
      spring.redis.port=6379
      
    • 连接测试

      @SpringBootTest
      class Redis02SpringbootApplicationTests {
      
          @Autowired
          private RedisTemplate redisTemplate;
      
          @Test
          void contextLoads() {
              /*
               *  redisTemplate  操作不同的数据类型,api和指令是一样的
               *  opsForValue    操作字符串,类似String
               *  opsForList     操作list,类型list
               *  opsForSet
               *  opsForHash
               *  opsForZSet
               *  opsForGeo
               *  opsForHyperLogLog
               *
               *  常用方法可以直接通过redisTemplate操作。比如:事务、CRUD
               */
              //获取Redis连接对象
              RedisConnection connection = redisTemplate.getConnectionFactory().getConnection();
              System.out.println(connection.ping());
              connection.flushDb();
      
              //redisTemplate.opsForValue().set("name","Beloved");
              redisTemplate.opsForValue().set("name","张三");
              System.out.println(redisTemplate.opsForValue().get("name"));
      
          }
      
      }
      

    image-20200506145736010

    关于序列化

    Redis存入所以的对象都要序列化,否则会产生中文乱码

    image-20200506145917460

    image-20200506150112439

    image-20200506151102775

    编写RedisTemplate

    //编写RedisTemplate
    @Bean
    @SuppressWarnings("all")
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory){
    
        //一般使用<String, Object>类型
        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
        template.setConnectionFactory(factory);
    
        //Json序列化配置
        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);
    
        //String序列化配置
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
    
        //key采用String的序列化方式
        template.setKeySerializer(stringRedisSerializer);
        //hash的key采用String的序列化
        template.setHashKeySerializer(stringRedisSerializer);
        //value采用jackson序列化方式
        template.setValueSerializer(jackson2JsonRedisSerializer);
        //hash的value采用jackson序列化方式
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
    
        return template;
    }
    

    测试

    image-20200506153438932

    image-20200506153500628

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  • 原文地址:https://www.cnblogs.com/ndbxy/p/12850934.html
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