我尝试使用DateTime反序列化一个类作为attibute:
import org.joda.time.DateTime;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.datatype.joda.deser.DateTimeDeserializer;
import com.fasterxml.jackson.datatype.joda.ser.DateTimeSerializer;
class MyClass {
private DateTime alertTimestamp;
private String name;
@JsonSerialize(using = DateTimeSerializer.class)
public DateTime getAlertTimestamp() {
return alertTimestamp;
}
@JsonDeserialize(using = DateTimeDeserializer.class)
public void setAlertTimestamp(DateTime now) {
this.alertTimestamp = now;
}
//...
}
但是当我尝试反序列化时,我有这个例外:
com.fasterxml.jackson.datatype.joda.deser.DateTimeDeserializer has no default (no arg) constructor
我用它来反序列化:
ObjectMapper mapper = new ObjectMapper();
mapper.readValue(jsonData, MyClass.class);
我的jsonData的一个例子:
{
"name":"test",
"alertTimestamp": {"year":2014,"era":1,"dayOfMonth":24,"dayOfWeek":1,"dayOfYear":83,"weekOfWeekyear":13,"weekyear":2014,"monthOfYear":3,"yearOfEra":2014,"yearOfCentury":14,"centuryOfEra":20,"millisOfSecond":232,"millisOfDay":45143232,"secondOfMinute":23,"secondOfDay":45143,"minuteOfHour":32,"minuteOfDay":752,"hourOfDay":12,"zone":{"uncachedZone":{"cachable":true,"fixed":false,"id":"America/Los_Angeles"},"fixed":false,"id":"America/Los_Angeles"},"millis":1395689543232,"chronology":{"zone":{"uncachedZone":{"cachable":true,"fixed":false,"id":"America/Los_Angeles"},"fixed":false,"id":"America/Los_Angeles"}},"afterNow":false,"beforeNow":false,"equalNow":true}
}
答案 0 :(得分:9)
@JsonDeserialize
期望JsonDeserializer
使用no-arg构造函数。 DateTimeDeserializer
的最新版本没有这样的构造函数。
如果您已修复格式,即。 alertTimestamp
应该只是一个时间戳,然后您可以只使用JodaModule
注册ObjectMapper
。它会在DateTimeDeserializer
字段内部使用DateTime
。您可以删除@JsonDeserialize
注释。
mapper.registerModule(new JodaModule());
您需要添加jackson-datatype-joda
库。