BEGIN_OBJECT가 예상되었지만 Java에서 Gson을 사용하는 BEGIN_ARRAY를 해결하는 방법은 무엇입니까?

역직렬화하는 동안 Gson은 JSON 개체를 기대할 수 있지만 JSON 배열을 찾을 수 있습니다. 하나에서 다른 것으로 변환할 수 없기 때문에 "JsonSyntaxException:java.lang.IllegalStateException:BEGIN_OBJECT가 예상되지만 BEGIN_ARRAY와 같은 오류가 발생할 수 있습니다. " 런타임에.

예시

import com.google.gson.Gson;
public class GsonErrorTest {
   public static void main(String args[]) throws Exception {
      String json = "{\"employee\":[{\"name\":\"Raja Ramesh\", \"technology\":\"java\"}]}";
      Gson gson = new Gson();
      Software software = gson.fromJson(json, Software.class);
      System.out.println(software);
   }
}
class Software {
   Employee employee;
}
class Employee {
   String name;
   String technology;
}

출력

Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 14
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:176)at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)at com.google.gson.Gson.fromJson(Gson.java:795)
at com.google.gson.Gson.fromJson(Gson.java:761)
at com.google.gson.Gson.fromJson(Gson.java:710)
at com.google.gson.Gson.fromJson(Gson.java:682)
at BeginObjectError.main(BeginObjectError.java:7)
Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 14
at com.google.gson.stream.JsonReader.expect(JsonReader.java:339)
at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:322)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:165)

POJO 유형을 컬렉션 또는 배열 유형으로. 아래 예에서는 목록 을 사용할 수 있습니다. POJO 클래스의 컬렉션입니다.

예시

import java.util.List;
import com.google.gson.Gson;
public class GsonListTest {
   public static void main(String args[]) throws Exception {
      String jsonString = "{\"employees\":[{\"name\":\"Raja Ramesh\", \"technology\":\"Java\"}]}";
      Gson gson = new Gson();
      Software software = gson.fromJson(jsonString, Software.class);
      System.out.println(software);
   }
}
class Software {
   List<Employee> employees;
   @Override
   public String toString() {
      return "Software [employees=" + employees + "]";
   }
}
class Employee {
   String name;
   String technology;
   @Override
   public String toString() {
      return "Employee [name=" + name + ", technology=" + technology + "]";
   }
}

출력

Software [employees=[Employee [name=Raja Ramesh, technology=Java]]]