序列化Serializable

news2024/12/23 10:49:49

一、传输对象的方式

将对象从内存传输到磁盘进行保存，或者进行网络传输，有两种方式：

实现Serializable接口，直接传输对象
转成json字符串后，进行字符串传输

二、直接传输对象

implements Serializable

@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("learning_lesson")
@ApiModel(value="LearningLesson对象", description="学生课程表")
public class LearningLesson implements Serializable {

    private static final long serialVersionUID = 1L;

    @ApiModelProperty(value = "主键")
    @TableId(value = "id", type = IdType.ASSIGN_ID)
    private Long id;

    @ApiModelProperty(value = "学员id")
    private Long userId;

    @ApiModelProperty(value = "课程id")
    private Long courseId;

    @ApiModelProperty(value = "课程状态，0-未学习，1-学习中，2-已学完，3-已失效")
    private LessonStatus status;

    @ApiModelProperty(value = "每周学习频率，例如每周学习6小节，则频率为6")
    private Integer weekFreq;

    @ApiModelProperty(value = "学习计划状态，0-没有计划，1-计划进行中")
    private PlanStatus planStatus;

    @ApiModelProperty(value = "已学习小节数量")
    private Integer learnedSections;

    @ApiModelProperty(value = "最近一次学习的小节id")
    private Long latestSectionId;

    @ApiModelProperty(value = "最近一次学习的时间")
    private LocalDateTime latestLearnTime;

    @ApiModelProperty(value = "创建时间")
    private LocalDateTime createTime;

    @ApiModelProperty(value = "过期时间")
    private LocalDateTime expireTime;

    @ApiModelProperty(value = "更新时间")
    private LocalDateTime updateTime;
}

举例Redis直接传输对象
单元测试

    //使用RedisTemplate<String,Object>需要配置一个RedisTemplate<String,Object>
    @Autowired
    private RedisTemplate<String,Object> redisTemplate;

    @Test
    public void Test1_Add(){
        User u = User.builder()
                .id(1000)
                .name("zhangsan")
                .phone("15730000001")
                .build();

        redisTemplate.opsForValue().set("user1", u);
    }

    @Test
    public void Test1_Get(){
        Object obj = redisTemplate.opsForValue().get("user1");
        // 这里不能把Object强转为User类 否则会java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to com.gzdemo.redisdemo.domain.User
        User user = JSONUtil.toBean(JSONUtil.toJsonStr(obj), User.class);
        System.out.println(user);
    }