import net.sf.json.JSONObject;

 public class JsonTools {

     public static JSONObject getJSONObject(String jData) {

         if (jData == null || jData.length() <= 0)

             return null;

         JSONObject obj = JSONObject.fromObject(jData);

         return obj;

     }

     public static <T> String getJsonString(T t) {

         JSONObject obj = JSONObject.fromObject(t);

         return obj.toString();

     }

     public static String getJsonValueByName(JSONObject object, String name) {

         if (object == null)

             return "--";

         String value = object.getString(name);

         if (null == value || "null".equalsIgnoreCase(value))

             value = "";

         return value;

     }

     public static String getJsonValueByName(String jData, String name) {

         if (jData == null || jData.length() <= 0)

             return "";

         JSONObject obj = JSONObject.fromObject(jData);

         String value = obj.getString(name);

         if (null == value || "null".equalsIgnoreCase(value))

             value = "";

         return value;

     }

     public static String getJsonValueNotNull(String jData, String name)

             throws Exception {

         if (jData == null || jData.length() <= 0)

             throw new Exception("获取请求数据[jsonData]为空");

         JSONObject obj = JSONObject.fromObject(jData);

         String value = obj.getString(name).trim();

         if (null == value || value.length() <= 0)

             throw new Exception("获取的数据对象[" + name + "]为空");

         return value;

     }

     @SuppressWarnings({ "rawtypes", "unchecked" })

     public static <T> T getJavaBean(String jData, Class clazz) {

         JSONObject jsonObject = JSONObject.fromObject(jData);

         return (T) JSONObject.toBean(jsonObject, clazz);

     }

 }