package com.upchina.common.config;

import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.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.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

@Configuration
public class JsonConfig {

    static {
        ParserConfig.getGlobalInstance().setSafeMode(true);
    }

    @Bean // 使用@Bean注入fastJsonHttpMessageConvert
    public HttpMessageConverters fastJsonHttpMessageConverters() {
        // 1.需要定义一个Convert转换消息的对象
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();

        // 2.添加fastjson的配置信息，比如是否要格式化返回的json数据
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(SerializerFeature.WriteMapNullValue, // 是否输出值为null的字段
                SerializerFeature.WriteNullListAsEmpty, // 将Collection类型字段的字段空值输出为[]
//                SerializerFeature.WriteNullNumberAsZero, // 将数值类型字段的空值输出为0
                SerializerFeature.DisableCircularReferenceDetect, // 禁用循环引用
                SerializerFeature.WriteDateUseDateFormat); //时间格式化

        // 中文乱码解决方案
        List<MediaType> mediaTypes = new ArrayList<>();
        mediaTypes.add(new MediaType("application", "json", StandardCharsets.UTF_8));//设定json格式且编码为UTF-8
        fastConverter.setSupportedMediaTypes(mediaTypes);

        // 3.在convert中添加配置信息
        fastConverter.setFastJsonConfig(fastJsonConfig);

        return new HttpMessageConverters(fastConverter);
    }

}