import java.io.IOException; import java.util.Date; import java.util.HashMap; import java.util.Map;  import javax.servlet.http.HttpServletResponse;  import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.serializer.SerializerFeature;  /**  *  * @author humf  *  */ public class FastJsonUtil {      /**    * 將對象轉成json串    * @param object    * @return    */   public static String toJSONString(Object object){     //DisableCircularReferenceDetect來禁止循環引用檢測     return JSON.toJSONString(object,SerializerFeature.DisableCircularReferenceDetect);   }      //輸出json   public static void write_json(HttpServletResponse response,String jsonString){     response.setContentType("application/json;utf-8");     response.setCharacterEncoding("UTF-8");     try {       response.getWriter().print(jsonString);     } catch (IOException e) {       e.printStackTrace();     }     }      /**    * ajax提交后回調的json字符串    * @return    */   public static String ajaxResult(boolean success,String message)   {     Map map=new HashMap();     map.put("success", success);//是否成功     map.put("message", message);//文本消息     String json= JSON.toJSONString(map);         return json;   }       /**    * JSON串自動加前綴    * @param json 原json字符串    * @param prefix 前綴    * @return 加前綴后的字符串    */    public static String JsonFormatterAddPrefix(String json,String prefix,Map<String,Object> newmap)   {     if(newmap == null){       newmap = new HashMap();     }     Map<String,Object> map = (Map) JSON.parse(json);      for(String key:map.keySet())     {       Object object=map.get(key);       if(isEntity(object)){         String jsonString = JSON.toJSONString(object);         JsonFormatterAddPrefix(jsonString,prefix+key+".",newmap);                }else{         newmap.put(prefix+key, object);       }            }     return JSON.toJSONString(newmap);       }   /**    * 判斷某對象是不是實體    * @param object    * @return    */   private static boolean isEntity(Object object)   {     if(object instanceof String )     {       return false;     }     if(object instanceof Integer )     {       return false;     }     if(object instanceof Long )     {       return false;     }     if(object instanceof java.math.BigDecimal )     {       return false;     }     if(object instanceof Date )     {       return false;     }     if(object instanceof java.util.Collection )     {       return false;     }     return true;        } }