[BUG] WriteNullNumberAsZero配合springboot框架不起效

[SiyuanLi-code]

问题描述

配置了fastjson的FastJsonHttpMessageConverter，@JSONField的serialzeFeatures，WriteNullNumberAsZero，不起效。经过验证，在1.2.83版本配置内能正常序列化，升级到2.0.40后，无效

环境信息

• JDK信息： idea 自带jdk 11.0.12
• 版本信息：Fastjson2.0.40

期待结果

{
  "age": 0,
  "attr": [
    322233333333333
  ],
  "id": 322223333333333,
  "name": "hello"
}

1.2.38版本输出满足

实际结果

{
  "attr": [
    322233333333333
  ],
  "id": 322223333333333,
  "name": "hello"
}

具体代码

controller

import cn.hutool.core.collection.ListUtil;
import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONWriter;
import com.alibaba.fastjson2.annotation.JSONField;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/fastjson")
public class TryController {

    @GetMapping("/serial")
    public User getOne(){
        User hello = new User();
        hello.setAge(null);
        hello.setName("hello");
        hello.setId(322223333333333L);
        hello.setAttr(ListUtil.list(false, 322233333333333L));
        return hello;
    }

    public static class User {

        @JSONField(serializeFeatures = JSONWriter.Feature.WriteNullNumberAsZero)
        private Integer age;

        private Long id;

        private String name;

        private List<Long> attr;

        public Integer getAge() {
            return age;
        }

        public void setAge(Integer age) {
            this.age = age;
        }

        public Long getId() {
            return id;
        }

        public void setId(Long id) {
            this.id = id;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public List<Long> getAttr() {
            return attr;
        }

        public void setAttr(List<Long> attr) {
            this.attr = attr;
        }
    }

}

fastjson配置

import com.alibaba.fastjson2.support.config.FastJsonConfig;
import com.alibaba.fastjson2.support.spring.http.converter.FastJsonHttpMessageConverter;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;

import java.util.ArrayList;
import java.util.List;

@Configuration
public class FastjsonConfig {

    @Bean
    public HttpMessageConverters fastJsonHttpMessageConverters() {
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON);
        fastConverter.setSupportedMediaTypes(fastMediaTypes);

        fastConverter.setFastJsonConfig(fastJsonConfig);
        return new HttpMessageConverters(fastConverter);
    }
}

pom

        <dependency>
            <groupId>com.alibaba.fastjson2</groupId>
            <artifactId>fastjson2</artifactId>
            <version>2.0.40</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.fastjson2</groupId>
            <artifactId>fastjson2-extension-spring5</artifactId>
            <version>2.0.40</version>
        </dependency>

[liaozan]

试下最新版本？可能 #1898 解决了这个问题