jQuery调用JSON时，net.sf.json.JSONException: There is a cycle in the hierarchy

来源：互联网发布：手机淘宝订单无故消失编辑：程序博客网时间：2024/05/17 08:57

net.sf.json.JSONException: There is a cycle in the hierarchy!

这个问题一看就是hibernate的关联问题，在处理json的时候，没有能够转换正确，话不多说，先上代码

    List<TrLinePicture> respicList=this.commonMng.findByProperties(TrLinePicture.class, new String[]{"trLineInfo.id"}, new Object[]{id},new String[]{"orderNum"},new String[]{"asc"});
               JsonConfig config=new JsonConfig();
               config.setJsonPropertyFilter(new PropertyFilter() {
                   @Override
                   public boolean apply(Object arg0, String arg1, Object arg2) {
                       if(arg1.equals("trLineInfo")){//过滤掉trLineInfo属性
                           return true;
                       }else{
                           return false;
                       }
                   }
               });
               JSONArray jsonArray=JSONArray.fromObject(respicList,config);

这边的需求是线路主表、以及线路图片子表，具体的子表配置如下

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.ldcms.ld.entity.travel">
   <class name="TrLinePicture" table="tr_line_pictures" dynamic-update="true">
       <meta attribute="sync-DAO">false</meta>
       <cache usage="read-write"/>
       <id name="id" type="java.lang.Integer" column="pk_pic_id"><generator class="sequence"><param name="sequence">TR_LINE_PICTURES_SEQ</param></generator></id>
       <property name="picPath" column="pic_path" type="string" not-null="false" length="30"/>
       <property name="orderNum" column="order_num" type="integer" not-null="false" length="10"/>
       <property name="isTitlePic" column="is_title_pic" type="string" not-null="true" length="1"/>
       <many-to-one name="trLineInfo" column="fk_line_info_id" class="TrLineInfo" not-null="true"></many-to-one>
   </class>
</hibernate-mapping>

同时在主表（线路表）上也配置了线路图片的关联关系

此时是双向关联，当你在JSONArray.fromObject 子表的时候，如果不去除主表的配置属性，此时会出现死循环

所以需要上述代码进行处理，所以结果就ok啦！！

0 0