将json字符串转换为java对象
我有下面的jsonString,我需要将它转换为java对象,我使用了下面的代码来转换它,但是我得到了这个异常将json字符串转换为java对象,java,json,jackson,objectmapper,Java,Json,Jackson,Objectmapper,我有下面的jsonString,我需要将它转换为java对象,我使用了下面的代码来转换它,但是我得到了这个异常 com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.innvo.web.rest.dto.Responsedetail$Questiongroup]: can not instantiate from JSO
com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.innvo.web.rest.dto.Responsedetail$Questiongroup]: can not instantiate from JSON object (missing default constructor or creator, or perhaps need to add/enable type information?)
Json字符串
String jsonStrings ="{"questiongroups":[{"questiongroup":"1000","questions":[{"question":1001,"response":4},{"question":1002,"subquestion":1001,"response":"A2"}]}]}";
ResponseDetails.java
public class Responsedetail {
@JsonProperty("questiongroups")
public List<Questiongroup> questiongroups;
public List<Questiongroup> getQuestiongroups() {
return questiongroups;
}
public void setQuestiongroups(List<Questiongroup> questiongroups) {
this.questiongroups = questiongroups;
}
public Responsedetail() {
super();
}
class Questiongroup{
@JsonProperty("questiongroup")
String questiongroup;
@JsonProperty("questions")
List<Question> questions;
public Questiongroup() {
super();
}
public String getQuestiongroup() {
return questiongroup;
}
public void setQuestiongroup(String questiongroup) {
this.questiongroup = questiongroup;
}
public List<Question> getQuestions() {
return questions;
}
public void setQuestions(List<Question> questions) {
this.questions = questions;
}
class Question{
@JsonProperty("question")
String question;
@JsonProperty("response")
String response;
public Question() {
super();
}
public String getQuestion() {
return question;
}
public void setQuestion(String question) {
this.question = question;
}
public String getResponse() {
return response;
}
public void setResponse(String response) {
this.response = response;
}
}
}
您的
Questiongroup
类嵌套在Responsedetail
类中,Question
嵌套在Questiongroup
中
因为您没有使它们成为静态的,所以它们是静态的
将static
添加到嵌套类中,使其成为静态嵌套类
或者,在它们自己的
.java
源文件中创建所有顶级类。谢谢,您帮助了我,节省了我的时间
String jsonStrings ="{"questiongroups":[{"questiongroup":"1000","questions":[{"question":1001,"response":4},{"question":1002,"subquestion":1001,"response":"A2"}]}]}";
ObjectMapper mapper = new ObjectMapper();
Responsedetail responsedetail = mapper.readValue(response.getDetails(), Responsedetail.class);
System.out.println(responsedetail);
System.out.println(responsedetail.questiongroups);