ObjectMapper配置搜集

DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY

接受单个字符的值反序列化为数组。

mapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true)

public class Persion{
    List<String> names;
}

接受1: 
{"person": {
    "names": ["lo","wang"]
    }
}
接受2:
{"person": {
    "names": "wayne"
    }
}

MapperFeature.USE_WRAPPER_NAME_AS_PROPERTY_NAME

mapper.configure(MapperFeature.USE_WRAPPER_NAME_AS_PROPERTY_NAME, true);

DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES

反序列化时，允许有未知字段

mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

JsonInclude.Include.NON_NULL

序列化的时候，不输出null值

objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

setDateFormat

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
mapper.setDateFormat(dateFormat);

annotaion

AnnotationIntrospector primary = new JacksonAnnotationIntrospector();
AnnotationIntrospector secondary = new JaxbAnnotationIntrospector();
mapper.setAnnotationIntrospector(AnnotationIntrospector.pair(primary, secondary));

https://www.programcreek.com/java-api-examples/index.php?api=com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector

https://www.iteye.com/blog/conkeyn-2188038

public final class JsonObjectMapper extends ObjectMapper {  
  /** */  
  private static final long serialVersionUID = 4563671462132723274L;  
  
  public JsonObjectMapper() {  
    super();  
    // 从JSON到java object  
    // 没有匹配的属性名称时不作失败处理  
    this.configure(MapperFeature.AUTO_DETECT_FIELDS, true);  
  
    // 反序列化  
    // 禁止遇到空原始类型时抛出异常，用默认值代替。  
    this.configure(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES, false);  
    this.configure(DeserializationFeature.READ_ENUMS_USING_TO_STRING, true);  
    // 禁止遇到未知（新）属性时报错，支持兼容扩展  
    this.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);  
    this.configure(DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES, false);  
    this.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);  
    // 按时间戳格式读取日期  
    // this.configure(DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS, true);  
    this.configure(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL, true);  
    this.configure(DeserializationFeature.READ_ENUMS_USING_TO_STRING, true);  
    this.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);  
    // 序列化  
    // 禁止序列化空值  
    this.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);  
    this.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);  
    this.configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, true);  
    this.configure(SerializationFeature.WRITE_EMPTY_JSON_ARRAYS, true);  
    // 按时间戳格式生成日期  
    // this.configure(SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS, true);  
    this.configure(SerializationFeature.FLUSH_AFTER_WRITE_VALUE, true);  
    this.configure(SerializationFeature.WRITE_BIGDECIMAL_AS_PLAIN, true);  
    // 不包含空值属性  
    this.setSerializationInclusion(Include.NON_EMPTY);  
    this.setSerializationInclusion(Include.NON_NULL);  
    // this.configure(MapperFeature.USE_WRAPPER_NAME_AS_PROPERTY_NAME, true);  
    // 是否缩放排列输出，默认false，有些场合为了便于排版阅读则需要对输出做缩放排列  
    this.configure(SerializationFeature.INDENT_OUTPUT, false);  
    // 设置全局的时间转化  
    SimpleDateFormat smt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
    this.setDateFormat(smt);  
    // 设置日期反序列化组件  
    SimpleModule dateDeserializerModule = new SimpleModule();  
    dateDeserializerModule.addDeserializer(Object.class, new CustomDateDeseralizer());  
    this.registerModule(dateDeserializerModule);  
    // 注意：不要开启序列化和反序列化时为对象附加@class属性（坑）  
    // this.enableDefaultTyping(ObjectMapper.DefaultTyping.JAVA_LANG_OBJECT, As.PROPERTY);  
  }  
  
}