springboot2中使用Fastjson中文乱码问题解决方法

1.在每一个api的RequestMapping加上 

produces="application/json;charset=UTF-8"

2.

package com.zkane.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.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

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

/**
 * @Description fastjson配置类
 * @Author wangjk
 * @Date 2019年07月26日
 **/
@Configuration
public class FastJsonConfiguration implements WebMvcConfigurer {
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        Iterator<HttpMessageConverter<?>> iterator = converters.iterator();
        while(iterator.hasNext()){
            HttpMessageConverter<?> converter = iterator.next();
            if(converter instanceof MappingJackson2HttpMessageConverter){
                iterator.remove();
            }
        }
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                // 防止循环引用
                SerializerFeature.DisableCircularReferenceDetect,
                // 空集合返回[],不返回null
                SerializerFeature.WriteNullListAsEmpty,
                // 空字符串返回"",不返回null
                SerializerFeature.WriteNullStringAsEmpty,
                SerializerFeature.WriteMapNullValue
        );
        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);

        //处理中文乱码问题
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);

        converters.add(fastJsonHttpMessageConverter);
    }
}

说明如果api是直接返回的String类型，是不管用的。这是fastjson一直存在的bug。可以在项目中封装一个返回类。一般包括data、code、message、Throwable、pagebean这些信息。