SpringMVC Json自定义序列化和反序列化的操作方法

@JsonSerialize(using = CustomDateSerializer.class) 
private Long createTime;

@JsonSerialize(using = CustomDateSerializer.class) 
private Long updateTime;

public class CustomDateSerializer extends JsonSerializer<Long> {

 @Override
 public void serialize(Long aLong, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  Date date = new Date(aLong);
  jsonGenerator.writeString(sdf.format(date));
 }
}

@Component
public class StringTrimModule extends SimpleModule {

 public StringTrimModule() {
  addDeserializer(String.class, new StdScalarDeserializer<String>(String.class) {
   @Override
   public String deserialize(JsonParser jsonParser, DeserializationContext ctx) throws IOException {
    String value = jsonParser.getValueAsString();
    if (StringUtils.isEmpty(value)) {
      return value;
    }
    return value.trim();
   }
  });
 }
}

<dependency>
 <groupId>com.alibaba</groupId>
 <artifactId>fastjson</artifactId>
 <version>1.2.62</version>
</dependency>

/**
 * 统一输出是采用fastJson
 *
 * @return
 */
@Bean
public HttpMessageConverters fastJsonHttpMessageConverters() {
 //convert转换消息的对象
 FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();

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

 //是否要格式化返回的json数据
 FastJsonConfig fastJsonConfig = new FastJsonConfig();
 fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
 // 添加指定字段的值转换处理
 fastJsonConfig.setSerializeFilters(new CustomerDateFilter());
 // FastJson禁用autoTypeSupport
 fastJsonConfig.getParserConfig().setAutoTypeSupport(false);
 fastConverter.setFastJsonConfig(fastJsonConfig);

 return new HttpMessageConverters(fastConverter);
}

// 添加指定字段的值转换处理
fastJsonConfig.setSerializeFilters(new CustomerDateFilter());

public class CustomerDateFilter implements ValueFilter {

 @Override
 public Object process(Object object, String name, Object value) {
  if (FieldConstants.CREATE_TIME.equalsIgnoreCase(name) || FieldConstants.UPDATE_TIME.equalsIgnoreCase(name)) {
   // 属性名为createTime, updateTime进行转换处理
   SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   sdf.setTimeZone(TimeZone.getTimeZone("GMT+8"));

   if(value instanceof Long) {
    Long time = (Long) value;
    Date date = new Date(time);
    return sdf.format(date);
   } else {
    return value;
   }
  }
  return value;
 }
}

@JSONField(format="trim")
private String name;

/**
 * @title: StringTrimDeserializer
 * @description: 把String类型的内容统一做trim操作
 */
public class StringTrimDeserializer implements ObjectDeserializer {

 @Override
 public <T> T deserialze(DefaultJSONParser parser, Type type, Object fieldName) {
  // JSON String反序列化的逻辑比较复杂，在StringCodec的基础上，对其结果调用trim方法
  Object obj = StringCodec.instance.deserialze(parser, type, fieldName);
  if (obj instanceof String) {
   String str = (String) obj;
   return (T) str.trim();
  }
  return (T) obj;
 }

 @Override
 public int getFastMatchToken() {
  return JSONToken.LITERAL_STRING;
 }
}

// 设置String类的全局反序列化规则：自动完成trim操作
ParserConfig.getGlobalInstance().putDeserializer(String.class, new StringTrimDeserializer());