使用SpringWeb服务时转换的java枚举类型

Question

这是对以下问题的延伸：

Spring web service request and response for mapping having list of other objects

如果问题POJO具有枚举类型，该怎么办。当发出请求并使用@RequestBody时，我如何在ajax调用中表示这一点

例如：

public class Question {

    private String questionText;

    List<Options> options;

    private QuestionTye questionType

    public String getQuestionText() {
        return questionText;
    }

    public void setQuestionText(String questionText) {
        this.questionText = questionText;
    }

    //getters and setters for options


}

Enum如下所示：

public enum QuestionType {

    MCQ, FILL_IN_THE_BLANK, QUESTION_AND_ANSWER, MATCH_THE_FOLLOWING

}

在将JSON发送到服务器时，我应该如何格式化JSON

Answer 1

假设类补丁上有jackson API，添加一个带注释的“Create”方法。我还想在枚举中添加一个“无”选项，以避免空指针：

public enum QuestionType {

    MCQ, FILL_IN_THE_BLANK, QUESTION_AND_ANSWER, MATCH_THE_FOLLOWING, NONE;

    @JsonCreator
    public QuestionType create(String input){

        QuestionType result;
        if("MCQ".equals(input)){

            result = MCQ;
        }
        else if(/*snip etc*/){

        }//etc
        else{

           result = NONE;//Or null or throw an exception .. whatever
        }
        return result;
    }
}