public class JSONUtils {    private static Gson gson = null;    static {        if (gson == null) {            gson = new Gson();        }    }    private JSONUtils() {    }    /**     * 转成json     *     * @param object     * @return     */    public static String GsonString(Object object) {        String gsonString = null;        if (gson != null) {            gsonString = gson.toJson(object);        }        return gsonString;    }    /**     * 转成bean     *     * @param gsonString     * @param cls     * @return     */    public static 
      
        T GsonToBean(String gsonString, Class
       
         cls) {        T t = null;        if (gson != null) {            t = gson.fromJson(gsonString, cls);        }        return t;    }    /**     * 转成list     * 泛型在编译期类型被擦除导致报错     *     * @param gsonString     * @param cls     * @return     */    public static 
        
          List
         
           GsonToList(String gsonString, Class
          
            cls) {        List
           
             list = null; if (gson != null) { list = gson.fromJson(gsonString, new TypeToken
            
             
              >() { }.getType()); } return list; } /** * 转成list * 解决泛型问题 * * @param json * @param cls * @param 
              
                * @return */ public 
               
                 List
                
                  jsonToList(String json, Class
                 
                   cls) { Gson gson = new Gson(); List
                  
                    list = new ArrayList
                   
                    (); JsonArray array = new JsonParser().parse(json).getAsJsonArray(); for (final JsonElement elem : array) { list.add(gson.fromJson(elem, cls)); } return list; } /** * 转成list中有map的 * * @param gsonString * @return */ public static 
                    
                      List