Springboot2.X整合redis

Springboot2.X整合redis

一、添加pomredis配置依赖

• springboot 1.5.x版本的默认的Redis客户端是 Jedis实现的，springboot 2.x版本中默认客户端是用 lettuce实现的
• 使用jackson进行redis序列化

       <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
          
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>

    # spring-boot-starter-web里面包含了jackson依赖
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

二、yml文件配置

 redis:
    database: 0
    host: xxxx(主机名称)
    port: 6379
    password: root
    lettuce:
      pool:
        # 接池最大连接数（使用负值表示没有限制）
        max-active: 8
        # 连接池最大阻塞等待时间（使用负值表示没有限制）
        max-wait: -1ms
        # 连接池中的最小空闲连接
        max-idle: 8
        # 连接池中的最大空闲连接
        min-idle: 0
      # 连接超时时间
    timeout: 2000ms

三、redis序列化配置（对key和value都进行序列化）

• 不对key序列化会出现乱码

    xxxx:6379> keys *
    ¬
    쳳tudent::123

• 不对value序列化会出现乱码

   xxx:6379> get student::16888866
   ¬첲com.test.domain.StudentZ²ǏD󿳲L
   java.time.Ser]º²/time/LocalDateTime;LidtLjava/lang/String;Lnameq~xpsr
                   xpw
                     ᓑ5󿿸16888866t小8

• 重写RedisTemplate类型以及对key，value进行序列化
  • 配置全局序列化

    @Configuration
    // 控制配置类的加载顺序,先加载 RedisAutoConfiguration.class 再加载该类,这样才能覆盖默认的 RedisTemplate
    @AutoConfigureAfter(RedisAutoConfiguration.class)
    public class RedisConfig {
        @Bean
        public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
            // 配置 json 序列化器 - Jackson2JsonRedisSerializer
            Jackson2JsonRedisSerializer jacksonSerializer = new Jackson2JsonRedisSerializer<>(Object.class);
            //ObjectMapper类是Jackson库的主要类。它提供一些功能将转换成Java对象匹配JSON结构
            ObjectMapper objectMapper = new ObjectMapper();
            //配置全局序列化参数
            objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
            objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
            jacksonSerializer.setObjectMapper(objectMapper);
    
            // 创建并配置自定义 RedisTemplateRedisOperator
            RedisTemplate<String, Object> template = new RedisTemplate<>();
            template.setConnectionFactory(redisConnectionFactory);
            // 将 key 序列化成字符串
            template.setKeySerializer(new StringRedisSerializer());
            // 将 hash 的 key 序列化成字符串
            template.setHashKeySerializer(new StringRedisSerializer());
            // 将 value 序列化成 json
            template.setValueSerializer(jacksonSerializer);
            // 将 hash 的 value 序列化成 json
            template.setHashValueSerializer(jacksonSerializer);
            template.afterPropertiesSet();
            return template;
        }
    
    
    }
    

四、使用jackosn序列化redis存入时间参数不正确

• 存入时间参数格式与java日期格式不正确会出现序列化失败

  //错误信息
  Cannot construct instance of `java.time.LocalDateTime` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)

• 查询redis中的时间格式

xxx:6379> get student::789
["com.test.domain.Student",{"id":"789","name":"小勇","createTime":{"date":{"year":2019,"month":"NOVEMBER","day":22,"era":["java.time.chrono.IsoEra","CE"],"dayOfMonth":22,"dayOfWeek":"FRIDAY","dayOfYear":326,"leapYear":false,"monthValue":11,"prolepticMonth":24238,"chronology":{"id":"ISO","calendarType":"iso8601"}},"time":{"hour":15,"minute":52,"second":57,"nano":716000000},"dayOfMonth":22,"dayOfWeek":"FRIDAY","dayOfYear":326,"month":"NOVEMBER","monthValue":11,"year":2019,"hour":15,"minute":52,"nano":716000000,"second":57,"chronology":["java.time.chrono.IsoChronology",{"id":"ISO","calendarType":"iso8601"}]}}]

• 在实体类上加上jackson注解或是编写jackson配置文件或者

//需要在时间参数加上jackson序列化
 @JsonDeserialize(using = LocalDateTimeDeserializer.class)
 @JsonSerialize(using = LocalDateTimeSerializer.class)
 private LocalDateTime createTime;

• 加上注解会显示正确时间格式

xxxx:6379> get student::123
["com.test.domain.Student",{"id":"123","name":"小化","createTime":[2019,11,22,15,30,54,437000000]}]

五、由用户去进行序列化

• 使用StringRedis进行key的序列化
• 使用fastJSON进行反序列化

   //StringRedisTemplate的key和value都只能存储字符串
  @Autowired
  private StringRedisTemplate redisTemplate;
  
  redisTemplate.opsForValue().set(string + student.getId(), JSON.toJSONString(student));
  String s = redisTemplate.opsForValue().get(string + student.getId());
  //使用fastJSon进行反序列化
  Student stu = JSON.parseObject(s, Student.class);

六、测试用例

    @Autowired
    private RedisTemplate redisTemplate;
    //key值最好使用统一前缀加上用户唯一标识
    private final String string = "student::";
    @Test
    public void redisTest() {
        Student student = new Student();
        student.setId("123");
        student.setName("小化");
        student.setCreateTime(LocalDateTime.now());

        redisTemplate.opsForValue().set(string + student.getId(), student);
        Student stu = (Student) redisTemplate.opsForValue().get(string + student.getId());
        log.info(stu.toString());

    }