无法反序列化-Jackson LocalDate/Time-JUnit [英] Unable to Deserialize - Jackson LocalDate/Time - JUnit

问题描述

我需要在Junit中将Json反序列化为Java对象.我有

I need to deserialize the Json to Java Objects in Junit. I have Json file like

{
   "studentId":57,
   "JoinedDate":"31-12-2019",
   "DOB":"08-06-1998"  

}

我有相同的课程要映射

public class Student{

    private long studentId ;

    private LocalDate JoinedDate;

    private LocalDate DOB ;

    public long getStudentId() {
        return studentId;
    }

    public void setStudentId(long studentId) {
        this.studentId = studentId;
    }

    public LocalDate getJoinedDate() {
        return JoinedDate;
    }

    public void setJoinedDate(LocalDate joinedDate) {
        JoinedDate = joinedDate;
    }

    public LocalDate getDOB() {
        return DOB;
    }

    public void setDOB(LocalDate dOB) {
        DOB = dOB;
    }

我需要为类似这样的单元测试项目编写集中式生成器

I need to write centralized builder for Unit testing project similar like this

builder.deserializers(new LocalDateDeserializer(DateTimeFormatter.ofPattern(dateFormat)));
            builder.serializers(new LocalDateSerializer(DateTimeFormatter.ofPattern(dateFormat)));

主类

@RunWith(SpringRunner.class)
@SpringBootTest(classes = Main.class)
@WebAppConfiguration
public class Main{
    @Test
    public void contextLoads() {
        assertTrue(true);
    }

}

单元测试项目看起来像

@RunWith(SpringRunner.class)
@SpringBootTest(classes = Main.class)
@WebAppConfiguration
public class StudentTest{

private ObjectMapper jsonObjectMapper;
@Before
public void setUp() throws IOException {

    jsonObjectMapper = new ObjectMapper();
    studentJson = IOUtils.toString(getClass().getResourceAsStream(CommonTestConstants.StudentPath+ "/Student.json"));


}

映射对象时出现错误- com.fasterxml.jackson.databind.exc.InvalidFormatException:无法从字符串"31-12-2019"反序列化类型为java.time.LocalDate的值:无法反序列化java.time.LocalDate:

I'm getting a error while mapping the objects - com.fasterxml.jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type java.time.LocalDate from String "31-12-2019": Failed to deserialize java.time.LocalDate:

另一个错误-有时.

com.fasterxml.jackson.databind.JsonMappingException:文本'31 -12-2019' 无法在索引0处解析

com.fasterxml.jackson.databind.JsonMappingException: Text '31-12-2019' could not be parsed at index 0

我认为是LocalDate格式不匹配的问题.任何建议使其集中化而不是在字段上方指定格式的建议.有人请指教吗?

I assume LocalDate format mismatch is the issue. Any suggestion to make it centralized way instead of specifying the format above the fields. Any one please advise?

参考- Spring Boot JacksonTester自定义序列化器未注册

推荐答案

Springboot 1.4.x或更高版本具有此接口Jackson2ObjectMapperBuilderCustomizer，可用于初始化objectMapper.

Springboot 1.4.x or above has this interface Jackson2ObjectMapperBuilderCustomizer which allows you to initialize objectMapper.

我们需要做的是重写customize方法并注册deserializers和 serializers.

What we need to do, is override customize method and register deserializers and serializers.

@SpringBootApplication
public class TestApplication implements Jackson2ObjectMapperBuilderCustomizer {

  @Override
  public void customize(Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder) {
     // pattern could be anything whatever is required
     DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy/dd/MM");

     LocalDateSerializer localDateDeserializer = new LocalDateSerializer(formatter);

     jackson2ObjectMapperBuilder
       .failOnEmptyBeans(false)
       .deserializersByType(new HashMap<Class<?>, JsonDeserializer<?>>(){{
         put(LocalTime.class, localTimeSerializer);
       }});
    }
}

我们也可以添加seriliazers类似的方式.

We can also add seriliazers similar way.

jackson2ObjectMapperBuilder
   .failOnEmptyBeans(false)
   .serializersByType(new HashMap<Class<?>, JsonSerializer<?>>(){{
         put(LocalTime.class, localTimeSerializer);
   }});

您可以在此处查看更多详细信息.

you can check more details here. Spring Jackson builder

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