强制Jackson将LocalDate序列化为数组 [英] Force Jackson serialize LocalDate to Array

问题描述

我正在使用spring-boot 2.1.6，并且有一个API可以接受包含日期的表单，例如:

I'm using spring-boot 2.1.6 and there is an API to accept a form including a date like:

@Data
public class MyForm {
    private LocalDate date;
    ...
}

@Controller
public class MyController {
    @PostMapping("...")
    public ResponseEntity<...> post(@RequestBody MyForm myForm) {
        ...
    }
}

默认情况下，spring MVC接受以下JSON格式:

By default spring MVC accept this JSON format:

{
   "date": [2020, 6, 17],
   ...
}

因此在前端，我的JavaScript代码只需提交这样的表单，即JS会将日期转换为数组.

So in Front-End, my JavaScript code just submit a form like this, i.e. JS will convert a date to an array.

但是当我运行spring-boot测试时，使用以下代码，此序列化将不起作用:

But when I run spring-boot test, this serialization does not work, with the following code:

    private ObjectMapper mapper = new ObjectMapper();

    @Autowired
    private MockMvc mockMvc;

    @Test
    public void doTest() {
        MyForm form = ...
        MvcResult result = mockMvc.perform(MockMvcRequestBuilders.post("/...").
                contentType("application/json").content(mapper.writeValueAsString(form)).andReturn();
        ...
    }

这是因为杰克逊默认情况下将LocalDate序列化为:

This is because Jackson by default serialize LocalDate as:

{
    "date": {
        "year":2020,
        "month":"JUNE",
        "monthValue":6,
        ...
    }
    ...
}

如此处所述: LocalDate序列化:日期是否为数组?，有很多强制spring-boot将数据序列化为格式yyyy-MM-dd的配置.但是我不想更改我的JS代码.我只是想让我的测试用例工作.

As mentioned here: LocalDate Serialization: date as array? , there are many configurations to force spring-boot serialize data as format yyyy-MM-dd. But I don't want to change my JS code. I just want to make my test case work.

如何配置ObjectMapper以强制Jackson将LocalDate序列化为数组?我只想得到这个:

How can I configure ObjectMapper to force Jackson to serialize LocalDate to Array? I just want to get this:

{
   "date": [2020, 6, 17],
   ...
}

更新

LocalDate这里是java.time.LocalDate，但不是org.joda.time.LocalDate.

推荐答案

您需要注册JavaTimeModule. Maven依赖项:

You need to register JavaTimeModule. Maven dependency:

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
</dependency>

示例，如何使用它:

import com.fasterxml.jackson.databind.json.JsonMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;

import java.time.LocalDate;

public class JsonApp {

    public static void main(String[] args) throws Exception {
        JsonMapper mapper = JsonMapper.builder()
                .addModule(new JavaTimeModule())
                .build();
        mapper.writeValue(System.out, new MyForm());
    }
}

class MyForm {

    private LocalDate value = LocalDate.now();

    public LocalDate getValue() {
        return value;
    }

    public void setValue(LocalDate value) {
        this.value = value;
    }
}

上面的代码显示:

{"value":[2020,6,17]}

另请参阅:

• jackson-modules-java8
• Jackson将即时序列化为纳秒级问题
• Jackson只要将LocalDateTime与Java 8

• jackson-modules-java8
• Jackson Serialize Instant to Nanosecond Issue
• Jackson deserialize elasticsearch long as LocalDateTime with Java 8

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