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 Object JSONToObj(String jsonStr,Class 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 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); } }