package com.yuqiyu;

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.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import java.util.List;


@Configuration
public class FastJsonConfiguration extends WebMvcConfigurerAdapter
{
    /**
     * 修改自定義訊息轉換器
     * @param converters 訊息轉換器列表
     */
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        //呼叫父類的配置
        super.configureMessageConverters(converters);
        //建立fastJson訊息轉換器
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        //建立配置類
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        //修改配置返回內容的過濾
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.DisableCircularReferenceDetect,
                SerializerFeature.WriteMapNullValue,
                SerializerFeature.WriteNullStringAsEmpty
        );
        fastConverter.setFastJsonConfig(fastJsonConfig);
        //將fastjson新增到檢視訊息轉換器列表內
        converters.add(fastConverter);
    }
}