问答平台（4），Spring整合Redis

引入依赖

• spring-boot-starter-data-redis

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

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配置Redis

• 配置数据库参数：application.properties

  # RedisProperties
  spring.redis.database=11 // (0~15)
  spring.redis.host=localhost
  spring.redis.port=6379

• 编写配置类，构造 RedisTemplate。

  // 包: config
  // RedisConfig.java
  @Configuration
  public class RedisConfig {
  
      @Bean
      public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
          RedisTemplate<String, Object> template = new RedisTemplate<>();
          template.setConnectionFactory(factory);
  
          // 设置key的序列化方式
          template.setKeySerializer(RedisSerializer.string());
          // 设置value的序列化方式
          template.setValueSerializer(RedisSerializer.json());
          // 设置hash的key的序列化方式
          template.setHashKeySerializer(RedisSerializer.string());
          // 设置hash的value的序列化方式
          template.setHashValueSerializer(RedisSerializer.json());
  
          template.afterPropertiesSet();
          return template;
      }
      
  }

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访问Redis

redisTemplate.opsForValue();
redisTemplate.opsForHash();
redisTemplate.opsForList();
redisTemplate.opsForSet();
redisTemplate.opsForZSet();

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测试类

// RedisTests.java
@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class RedisTests {

    @Autowired
    private RedisTemplate redisTemplate;

    @Test
    public void testStrings() {
        String redisKey = "test:count";

        redisTemplate.opsForValue().set(redisKey, 1);

        System.out.println(redisTemplate.opsForValue().get(redisKey));
        System.out.println(redisTemplate.opsForValue().increment(redisKey));
        System.out.println(redisTemplate.opsForValue().decrement(redisKey));
    }

    @Test
    public void testHashes() {
        String redisKey = "test:user";

        redisTemplate.opsForHash().put(redisKey, "id", 1);
        redisTemplate.opsForHash().put(redisKey, "username", "zhangsan");

        System.out.println(redisTemplate.opsForHash().get(redisKey, "id"));
        System.out.println(redisTemplate.opsForHash().get(redisKey, "username"));
    }

    @Test
    public void testLists() {
        String redisKey = "test:ids";

        redisTemplate.opsForList().leftPush(redisKey, 101);
        redisTemplate.opsForList().leftPush(redisKey, 102);
        redisTemplate.opsForList().leftPush(redisKey, 103);

        System.out.println(redisTemplate.opsForList().size(redisKey));
        System.out.println(redisTemplate.opsForList().index(redisKey, 0));
        System.out.println(redisTemplate.opsForList().range(redisKey, 0, 2));

        System.out.println(redisTemplate.opsForList().leftPop(redisKey));
        System.out.println(redisTemplate.opsForList().leftPop(redisKey));
        System.out.println(redisTemplate.opsForList().leftPop(redisKey));
    }

    @Test
    public void testSets() {
        String redisKey = "test:teachers";

        redisTemplate.opsForSet().add(redisKey, "刘备", "关羽", "张飞");

        System.out.println(redisTemplate.opsForSet().size(redisKey));
        System.out.println(redisTemplate.opsForSet().pop(redisKey));
        System.out.println(redisTemplate.opsForSet().members(redisKey));
    }

    @Test
    public void testSortedSets() {
        String redisKey = "test:students";

        redisTemplate.opsForZSet().add(redisKey, "唐僧", 80);
        redisTemplate.opsForZSet().add(redisKey, "悟空", 90);
        redisTemplate.opsForZSet().add(redisKey, "八戒", 50);
        redisTemplate.opsForZSet().add(redisKey, "沙僧", 70);
        redisTemplate.opsForZSet().add(redisKey, "白龙马", 60);

        System.out.println(redisTemplate.opsForZSet().zCard(redisKey));
        System.out.println(redisTemplate.opsForZSet().score(redisKey, "八戒"));
        System.out.println(redisTemplate.opsForZSet().reverseRank(redisKey, "八戒"));
        System.out.println(redisTemplate.opsForZSet().reverseRange(redisKey, 0, 2));
    }

    @Test
    public void testKeys() {
        redisTemplate.delete("test:user");

        System.out.println(redisTemplate.hasKey("test:user"));

        redisTemplate.expire("test:students", 10, TimeUnit.SECONDS);
    }

    // 多次访问同一个key
    @Test
    public void testBoundOperations() {
        String redisKey = "test:count";
        BoundValueOperations operations = redisTemplate.boundValueOps(redisKey);
        operations.increment();
        operations.increment();
        operations.increment();
        operations.increment();
        operations.increment();
        System.out.println(operations.get());
    }

    // 事务管理：编程式事务
    @Test
    public void testTransational() {
        Object obj = redisTemplate.execute(new SessionCallback() {
            @Override
            public Object execute(RedisOperations operations) throws DataAccessException {
                String redisKey = "test:tx";

                operations.multi();

                operations.opsForSet().add(redisKey, "zhangsan");
                operations.opsForSet().add(redisKey, "lisi");
                operations.opsForSet().add(redisKey, "wangwu");

                System.out.println(operations.opsForSet().members(redisKey));

                return operations.exec();
            }
        });
        System.out.println(obj);
    }
}

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参考资料

• https://mvnrepository.com/