spring boot 用fastjson返回中文乱码

方法1：加入

@PostMapping(value  = "/materialInfo",produces = "application/json; charset=utf-8")

方法2：

继承 WebMvcConfigurationSupport 重写 configureMessageConverters

/**
     * 替换框架json为fastjson
     * @param converters
     */
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
 
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
 
        //驼峰转下划线
        SerializeConfig serializeConfig=new SerializeConfig();
        serializeConfig.propertyNamingStrategy= PropertyNamingStrategy.SnakeCase;
        fastJsonConfig.setSerializeConfig(serializeConfig);
        //序列化格式
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.PrettyFormat,
                SerializerFeature.WriteNullStringAsEmpty
        );
        // 处理中文乱码问题
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastConverter.setSupportedMediaTypes(fastMediaTypes);
        fastConverter.setFastJsonConfig(fastJsonConfig);
 
        //处理字符串, 避免直接返回字符串的时候被添加了引号
        StringHttpMessageConverter smc = new StringHttpMessageConverter(Charset.forName("UTF-8"));
        converters.add(smc);
 
        converters.add(fastConverter);
    }