MessageConvert

简要描述：

• 响应对象序列化配置,在默认的json序列化规则无法满足我们的需求时，需要自定义序列化规则,以下以MappingJackson2HttpMessageConverter为例子

step1：

自定义CustomeMappingJackson2HttpMessageConverter
public class CustomeMappingJackson2HttpMessageConverter extends org.springframework.http.converter.json.MappingJackson2HttpMessageConverter {

    @Override
    protected void writeInternal(Object object, HttpOutputMessage outputMessage)
            throws IOException, HttpMessageNotWritableException {

        JsonEncoding encoding = getJsonEncoding(outputMessage.getHeaders().getContentType());
        JsonGenerator generator = this.objectMapper.getJsonFactory().createJsonGenerator(outputMessage.getBody(), encoding);
        try {
            writePrefix(generator, object);
            Class<?> serializationView = null;
            Object value = object;
            if (value instanceof MappingJacksonValue) {
                MappingJacksonValue container = (MappingJacksonValue) object;
                value = container.getValue();
                serializationView = container.getSerializationView();
            }
            if (serializationView != null) {
                this.objectMapper.writerWithView(serializationView).writeValue(generator, value);
            }
            else {
                this.objectMapper.writeValue(generator, value);
            }
            writeSuffix(generator, object);
            generator.flush();

        }
        catch (JsonProcessingException ex) {
            throw new HttpMessageNotWritableException("Could not write content: " + ex.getMessage(), ex);
        }
    }
}

step2：

servletConfig配置,最重要的是JacksonUtil.getObjectMapper(),获得自定义的mapper
@Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        Charset charset = Charset.forName("UTF-8");
        CustomeMappingJackson2HttpMessageConverter jacksonConverter = new CustomeMappingJackson2HttpMessageConverter();
        jacksonConverter.setObjectMapper(JacksonUtil.getObjectMapper());
        jacksonConverter.setSupportedMediaTypes(Lists.newArrayList(new MediaType("application", "json", charset),
                new MediaType("application", "*+json", charset)));

        StringHttpMessageConverter stringConverter = new StringHttpMessageConverter(charset);
        converters.add(stringConverter);

        converters.add(jacksonConverter);

        converters.add(new FormHttpMessageConverter());
        converters.add(new ByteArrayHttpMessageConverter());

    }
 
 

step3：

统一处理时间格式，null 序列化规则，timeZone设置，金额格式化，敏感字掩码等

 // 注册反序列化
        jacksonMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        // 注册序列化
        jacksonMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        DefaultSerializerProvider.Impl sp = new DefaultSerializerProvider.Impl();
        // sp.setNullValueSerializer(new NullSerializer());
        jacksonMapper.setSerializerProvider(sp);
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        jacksonMapper.setDateFormat(dateFormat);
        // 时间输出为时间戳
        jacksonMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, true);

        jacksonMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));

        jacksonMapper.setSerializerFactory(
                jacksonMapper.getSerializerFactory().withSerializerModifier(new CustomBeanSerializerModifier()));