SpringBoot自定义序列化的使用方式

Easter79
• 阅读 576

场景及需求: 项目接入了SpringBoot开发,现在需求是服务端接口返回的字段如果为空,那么自动转为空字符串。

例如:
[
     {
         "id": 1,
         "name": null
     },
     {
         "id": 2,
         "name": "xiaohong"
     }
]

如上,格式化后的返回内容应该为:
[
     {
         "id": 1,
         "name": ""
     },
     {
         "id": 2,
         "name": "xiaohong"
     }
]

这里直接给出解决方案代码,这里支持FastJson和Jackson配置序列化的方式:

@Configurationpublic class WebCatMvcConfiguration extends WebMvcConfigurationSupport {    @Override    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();        ObjectMapper objectMapper = new ObjectMapper();        SimpleModule module = new SimpleModule();        module.addSerializer(new ToStringSerializer(Long.TYPE));        module.addSerializer(new ToStringSerializer(Long.class));        module.addSerializer(new ToStringSerializer(BigInteger.class));        objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {            @Override            public void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {                jsonGenerator.writeString("");            }        });        objectMapper.registerModule(module);        converter.setObjectMapper(objectMapper);        //这里是fastJSON的配置方式,更多的内容可以查看SerializerFeature//        FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();//        converter.setFeatures(SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.WriteNullNumberAsZero,//                SerializerFeature.WriteNullBooleanAsFalse, SerializerFeature.WriteNullListAsEmpty);        converters.add(converter);    }

}

最后我们也可以了解一下:WebMvcConfigurationSupport类
下面是它的官方文档描述:

public class WebMvcConfigurationSupport
extends Object
implements ApplicationContextAware, ServletContextAware

This is the main class providing the configuration behind the MVC Java config. It is typically imported by adding @EnableWebMvc to an application @Configuration class. An alternative more advanced option is to extend directly from this class and override methods as necessary remembering to add @Configuration to the subclass and @Bean to overridden @Bean methods. For more details see the Javadoc of @EnableWebMvc.

This class registers the following HandlerMappings:

  • RequestMappingHandlerMapping ordered at 0 for mapping requests to annotated controller methods.
  • HandlerMapping ordered at 1 to map URL paths directly to view names.
  • BeanNameUrlHandlerMapping ordered at 2 to map URL paths to controller bean names.
  • HandlerMapping ordered at Integer.MAX_VALUE-1 to serve static resource requests.
  • HandlerMapping ordered at Integer.MAX_VALUE to forward requests to the default servlet.

Registers these HandlerAdapters:

  • RequestMappingHandlerAdapter for processing requests with annotated controller methods.
  • HttpRequestHandlerAdapter for processing requests with HttpRequestHandlers.
  • SimpleControllerHandlerAdapter for processing requests with interface-based Controllers.

Registers a HandlerExceptionResolverComposite with this chain of exception resolvers:

  • ExceptionHandlerExceptionResolver for handling exceptions through @ExceptionHandler methods.
  • ResponseStatusExceptionResolver for exceptions annotated with @ResponseStatus.
  • DefaultHandlerExceptionResolver for resolving known Spring exception types

Registers an AntPathMatcher and a UrlPathHelper to be used by:

  • the RequestMappingHandlerMapping,
  • the HandlerMapping for ViewControllers
  • and the HandlerMapping for serving resources

Note that those beans can be configured with a PathMatchConfigurer.

Both the RequestMappingHandlerAdapter and the ExceptionHandlerExceptionResolver are configured with default instances of the following by default:

  • a ContentNegotiationManager
  • a DefaultFormattingConversionService
  • a OptionalValidatorFactoryBean if a JSR-303 implementation is available on the classpath
  • a range of HttpMessageConverters depending on the third-party libraries available on the classpath.
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今生可爱与温柔,每一样都不能少。
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