SpringBoot 整合 fastjson

Springboot处理返回的参数为null、或者不返回

一、通过继承WebMvcConfigurerAdapter，重写configureMessageConverters方法实现

 @Configuration public class fastJsonConfig extends WebMvcConfigurerAdapter {     @Autowired     private LogCostInterceptor logCostInterceptor;      /**      * 使用阿里 fastjson 作为JSON MessageConverter      * @param converters      */     @Override     public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {         FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();         FastJsonConfig config = new FastJsonConfig();         config.setSerializerFeatures(                 //json格式输出                 SerializerFeature.PrettyFormat,                 // 保留map为空的字段                 SerializerFeature.WriteMapNullValue,                 // 将String类型的null转成""形式                 SerializerFeature.WriteNullStringAsEmpty,                 // 将Number类型的null转成0，也可以理解为Integer                 SerializerFeature.WriteNullNumberAsZero,                 // 将List类型的null转成[],而不是“””                 SerializerFeature.WriteNullListAsEmpty,                 // Boolean类型的null转成false                 SerializerFeature.WriteNullBooleanAsFalse,                 // 处理可能循环引用的问题                 SerializerFeature.DisableCircularReferenceDetect);         converter.setFastJsonConfig(config);         converter.setDefaultCharset(Charset.forName("UTF-8"));         List<MediaType> mediaTypeList = new ArrayList<>();         mediaTypeList.add(MediaType.APPLICATION_JSON);         converter.setSupportedMediaTypes(mediaTypeList);         converters.add(converter);     } }

二、在Springboot启动类中

 @Bean public HttpMessageConverters fastJsonConverters() {     FastJsonHttpMessageConverter4 fastConverter = new FastJsonHttpMessageConverter4();     FastJsonConfig fastJsonConfig = new FastJsonConfig();     fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat, SerializerFeature.IgnoreNonFieldGetter,             SerializerFeature.WriteMapNullValue, SerializerFeature.WriteNullStringAsEmpty);     fastConverter.setFastJsonConfig(fastJsonConfig);     List supportedMediaTypes = new ArrayList();     supportedMediaTypes.add(new MediaType("text", "json", Charset.forName("utf8")));     supportedMediaTypes.add(new MediaType("application", "json", Charset.forName("utf8")));     fastConverter.setSupportedMediaTypes(supportedMediaTypes);     HttpMessageConverter<?> converter = fastConverter;     return new HttpMessageConverters(converter); }

三、 在实体类中，添加： @JSONField注解，如果为false，接口中不会返回这个字段。

 @JSONField(serialize = false) private String password;

源码获取：
github
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