content: package fun.cmgraph.json;
  
  import com.fasterxml.jackson.databind.DeserializationFeature;
  import com.fasterxml.jackson.databind.ObjectMapper;
  // Date 线程不安全，Java8早用 LocalDateTime 替代了...
  import com.fasterxml.jackson.databind.deser.std.DateDeserializers.DateDeserializer;
  import com.fasterxml.jackson.databind.deser.std.DateDeserializers;
  import com.fasterxml.jackson.databind.module.SimpleModule;
  import com.fasterxml.jackson.databind.ser.std.DateSerializer;
  import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
  import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
  import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
  import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
  import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
  import com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;
  
  import java.text.DateFormat;
  import java.text.SimpleDateFormat;
  import java.time.LocalDate;
  import java.time.LocalDateTime;
  import java.time.LocalTime;
  import java.time.format.DateTimeFormatter;
  import java.util.Date;
  
  import static com.fasterxml.jackson.databind.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES;
  
  public class JacksonObjectMapper extends ObjectMapper {
  
      public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";
  
      // public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm";
      public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
      public static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";
  
      public JacksonObjectMapper() {
          super();
          // 收到未知属性时不报异常
          this.configure(FAIL_ON_UNKNOWN_PROPERTIES, false);
  
          // 反序列化时，属性不存在的兼容处理
          this.getDeserializationConfig().withoutFeatures(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
  
          // 加上三种时间格式对应的序列化器和反序列化器
          SimpleModule simpleModule = new SimpleModule()
                  .addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
                  .addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
                  .addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)))
                  .addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
                  .addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
                  .addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));
  
          // 注册功能模块 例如，可以添加自定义序列化器和反序列化器
          this.registerModule(simpleModule);
      }
  
  }
  