In Java entity classes and JSON objects are converted to each other
- 2020-04-01 03:51:08
- OfStack
When we need to use JSON object to encapsulate data, we tend to write a lot of code and copy and paste a lot. In order to use POJO's idea, we can convert JSON into entity objects for operation
package myUtil;
import java.io.IOException;
import myProject.Student;
import myProject.StudentList;
import org.codehaus.jackson.map.ObjectMapper;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class JSONUtil {
public static<T> Object JSONToObj(String jsonStr,Class<T> obj) {
T t = null;
try {
ObjectMapper objectMapper = new ObjectMapper();
t = objectMapper.readValue(jsonStr,
obj);
} catch (Exception e) {
e.printStackTrace();
}
return t;
}
public static<T> JSONObject objectToJson(T obj) throws JSONException, IOException {
ObjectMapper mapper = new ObjectMapper();
// Convert object to JSON string
String jsonStr = "";
try {
jsonStr = mapper.writeValueAsString(obj);
} catch (IOException e) {
throw e;
}
return new JSONObject(jsonStr);
}
public static void main(String[] args) throws JSONException, IOException {
JSONObject obj = null;
obj = new JSONObject();
obj.put("name", "213");
obj.put("age", 27);
JSONArray array = new JSONArray();
array.put(obj);
obj = new JSONObject();
obj.put("name", "214");
obj.put("age", 28);
array.put(obj);
Student stu = (Student) JSONToObj(obj.toString(), Student.class);
JSONObject objList = new JSONObject();
objList.put("student", array);
System.out.println("objList:"+objList);
StudentList stuList = (StudentList) JSONToObj(objList.toString(), StudentList.class);
System.out.println("student:"+stu);
System.out.println("stuList:"+stuList);
System.out.println("#####################################");
JSONObject getObj = objectToJson(stu);
System.out.println(getObj);
}
}
The above is all the content of this article, I hope you can enjoy it.