关于jackson jdk8时间序列化问题InvalidDefinitionException: Cannot construct instance of `java.time.LocalDate`

分手后的思念是犯贱 2023-01-09 15:33 96阅读 0赞

使用时间LocalDate序列化会报错

先上实体类，测试类

@Data
    public class MyTestDate { 
    
        private LocalDate now;
    }
    
    public class MyTest { 
        @Test
        public void ttt() throws Exception { 
            MyTestDate myTestDate=new MyTestDate();
            myTestDate.setNow(LocalDate.now());
            String json = JSONUtil.obj2json(myTestDate);
            System.out.println(json);
            MyTestDate myTestDate1 = JSONUtil.json2pojo(json, MyTestDate.class);
            System.out.println(myTestDate1);
        }
    }

报错

Connected to the target VM, address: '127.0.0.1:49535', transport: 'socket'
    {"now":{"year":2021,"month":"JANUARY","chronology":{"id":"ISO","calendarType":"iso8601"},"dayOfMonth":21,"dayOfWeek":"THURSDAY","dayOfYear":21,"era":"CE","monthValue":1,"leapYear":false}}
    
    com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `java.time.LocalDate` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
     at [Source: (String)"{"now":{"year":2021,"month":"JANUARY","chronology":{"id":"ISO","calendarType":"iso8601"},"dayOfMonth":21,"dayOfWeek":"THURSDAY","dayOfYear":21,"era":"CE","monthValue":1,"leapYear":false}}"; line: 1, column: 9] (through reference chain: com.zhaolaobao.adminuser.site.controller.MyTestDate["now"])

解决方案

@JsonDeserialize(using = LocalDateDeserializer.class)
        @JsonSerialize(using = LocalDateSerializer.class)
        private LocalDate now;