RestTemplate修改默认转换器，使用FastJsonConverter

问题描述：
在使用RestTemplate发送POST请求时，发现发送的数据并未按配置的@JSONField转换，导致服务方一直收不到参数

排查过程：
将itemList改成Items传输即可

原因分析：
RestTemplate有默认的转换器，所以配置@JSONField 没有作用

解决办法：
修改RestTemplate默认的转换器、或者将变量名改为Items

package com.rimag.adapter.config;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.GsonHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import java.nio.charset.StandardCharsets;
import java.util.Iterator;
import java.util.List;

/**
 * @author: hong
 * @date: 2024/6/18 10:25
 * @description
 */
@Configuration
public class RestTemplateConfig {

    @Bean
    public RestTemplate restTemplate() {
        // 设置超时时间
        HttpComponentsClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory();
        httpRequestFactory.setConnectionRequestTimeout(3000);
        httpRequestFactory.setConnectTimeout(3000);
        httpRequestFactory.setReadTimeout(3000);

        RestTemplate restTemplate = new RestTemplate(httpRequestFactory);
        //换上fastjson
        List<HttpMessageConverter<?>> messageConverters= restTemplate.getMessageConverters();
        Iterator<HttpMessageConverter<?>> iterator=messageConverters.iterator();
        while(iterator.hasNext()){
            HttpMessageConverter<?> converter=iterator.next();
            //原有的String是ISO-8859-1编码 去掉
            if(converter instanceof StringHttpMessageConverter){
                iterator.remove();
            }
            //由于系统中默认有jackson 在转换json时自动会启用  但是我们不想使用它 可以直接移除
            if(converter instanceof GsonHttpMessageConverter || converter instanceof MappingJackson2HttpMessageConverter){
                iterator.remove();
            }
        }
        messageConverters.add(new StringHttpMessageConverter(StandardCharsets.UTF_8));
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.WriteMapNullValue,
                SerializerFeature.WriteNullStringAsEmpty,
                SerializerFeature.WriteNullListAsEmpty,
                SerializerFeature.DisableCircularReferenceDetect);
        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
        // 添加 FastJsonHttpMessageConverter，优先级高于默认的 MappingJackson2HttpMessageConverter，否则RestTemplate发送请求转换不会按@JSONField注解
        messageConverters.add(fastJsonHttpMessageConverter);
        return restTemplate;
    }
}