java unmarshall LocalDateTime error

问题

This is my adapter class:

public class LocalDateTimeAdapter extends XmlAdapter<String, LocalDateTime> {

@Override
public LocalDateTime unmarshal(String v) throws Exception {
    return new LocalDateTime(v);
}

@Override
public String marshal(LocalDateTime v) throws Exception {
    return v.toString();
}

}

and this is an object-class where i want to store the date:

@XmlAccessorType(XmlAccessType.FIELD)
public class Object {

@XmlJavaTypeAdapter(LocalDateTimeAdapter.class)
private LocalDateTime time;

public LocalDateTime getTime() {
        return time;
    }

For some reason, i can't compile it. It shows that the problem is at return new LocalDateTime(v);. And this is the error I get:

    Error:(9, 16) java: constructor LocalDateTime in class java.time.LocalDateTime cannot be applied to given types;
  required: java.time.LocalDate,java.time.LocalTime
  found: java.lang.String
  reason: actual and formal argument lists differ in length

and the xml part:

<time type="dateTime">2000-01-01T19:45:00Z</time>

I'm following this example.

回答1:

Probably you're using LocalDateTime from Java 8. This class has not any constructor for string.

In the example which you're following LocalDateTime is from JodaTime.

So, you can do this in to ways:

Import org.joda.time.LocalDateTime (you will need JodaTime dependency) instead of java.time.LocalDateTime;

or change unmarshal method to something like this:

@Override
public LocalDateTime unmarshal(String v) throws Exception {
    return LocalDateTime.parse(v);
}

You may need to inform the date time format, as the default is a format to 2011-12-03T10:15:30, maybe this:

@Override
public LocalDateTime unmarshal(String v) throws Exception {
    return LocalDateTime.parse(v, DateTimeFormatter.ISO_INSTANT);
}

Also, in java.time.LocalDateTime toString will output one of the following ISO-8601 formats:

uuuu-MM-dd'T'HH:mm
uuuu-MM-dd'T'HH:mm:ss
uuuu-MM-dd'T'HH:mm:ss.SSS
uuuu-MM-dd'T'HH:mm:ss.SSSSSS
uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSS

来源：https://stackoverflow.com/questions/29424551/java-unmarshall-localdatetime-error

标签

java

xml

datetime

jaxb

unmarshalling