JAXB生成的奇怪的XML结构

Question

@XmlRootElement
public class Quiz {

    private List<Question> questions;

    public Quiz() {
        questions = new ArrayList<Question>();
    }

    public List<Question> getQuestions() {
        return questions;
    }

    public void setQuestions(List<Question> questions) {
        for (Question question : questions) {
            addQuestion(question);
        }
    }

    public void addQuestion(final Question question) {
        if (!(questions.contains(question))) {
            questions.add(question);
        }
    }

    public void removeQuestion(final Question question) {
        if (questions.contains(question)) {
            questions.remove(question);
        }
    }

    public int numberOfQuestions() {
        return questions.size();
    }
}

@XmlRootElement
public class Question extends AbstractModel {

}

<quiz><questions></questions><questions></questions></quiz>

Answer 1

默认情况下，JAXB(JSR-222)实现不提供分组元素。您可以使用@XmlElementWrapper获取一个。

@XmlElementWrapper
@XmlElement(name="question")
public List<Question> getQuestions() {
    return questions;
}

有关更多信息

• http://blog.bdoughan.com/2010/09/jaxb-collection-properties.html