实体类与JSON对象转化方法总结

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;
/**
 * 实体类和JSON对象之间相互转化（依赖包jackson-all-1.7.6.jar、jsoup-1.5.2.jar）
 * @author wck
 *
 */
public class JSONUtil {
 /**
 * 将json转化为实体POJO
 * @param jsonStr
 * @param obj
 * @return
 */
 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;
 }
 /**
 * 将实体POJO转化为JSON
 * @param obj
 * @return
 * @throws JSONException
 * @throws IOException
 */
 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);
 }
}