Spring Boot接口请求响应JSON格式不对称问题求助

发送Post/Put请求时，仅当使用扁平JSON（去掉大括号，只传属性值、不带属性名）时服务器才接收，而返回的却是嵌套JSON；若发送返回格式的嵌套JSON则会触发Bad Request，导致请求响应格式不对称。

接口请求/返回示例 #

1. MyTimeStamp接口 #

• 可正常接收的请求格式（扁平JSON）：

"2023-02-19T16:08:41.897+00:00"

• 服务器返回格式（嵌套JSON）：

{
   "timestamp": "2023-02-19T16:08:41.897+00:00"
}

2. MyTimeWrapper接口 #

• 可正常接收的请求格式：

{
   "myTimeStamp":"2023-02-19T16:08:41.897+00:00"
}

• 服务器返回格式：

{
    "myTimeStamp": {
        "timestamp": "2023-02-19T16:08:41.897+00:00"
    }
}

服务器端代码 #

MyTimeStamp类 #

package brokenjson.demo.demo;
import lombok.*;
@AllArgsConstructor
@ToString
@Getter
@Setter
public class MyTimeStamp {
    private String timestamp;
}

MyTimeWrapper类 #

package brokenjson.demo.demo;

import lombok.*;

import java.beans.ConstructorProperties;

@ToString
@Getter
@Setter
public class MyTimeWrapper {
    private MyTimeStamp myTimeStamp;

    public MyTimeWrapper() {
    }
}

控制器代码 #

package brokenjson.demo.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @PutMapping("/time")
    public MyTimeStamp gettingTimeStamp(@RequestBody MyTimeStamp myTimeStamp) {
        System.out.println(myTimeStamp);
        return myTimeStamp;
    }
    @PutMapping("/timeWrap")
    public MyTimeWrapper gettingTimeStamp(@RequestBody MyTimeWrapper myTimeWrapper) {
        System.out.println(myTimeWrapper);
        return myTimeWrapper;
    }
}

环境说明 #

• Java版本：17
• Spring Boot版本：3.0.2
• 原以为是WebFlux序列化问题，但Spring MVC项目也存在该问题
• 注：MyTimeWrapper类需添加无参构造才能接收请求，暂未发现与当前问题的关联

pom.xml配置 #

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.0.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>brokenjson.demo</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.26</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

内容的提问来源于stack exchange，提问作者Yoav Zinger