java中实体类和JSON对象之间相互转化

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);  }}