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json-lib出现There is a cycle in the hierarchy解决办法

    博客分类:
  • java
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问题的出现

 


如果需要解析的数据间存在级联关系,而互相嵌套引用,在hibernate中极容易嵌套而抛出net.sf.json.JSONException: There is a cycle in the hierarchy异常。

 
解决办法

1.设置JSON-LIB让其过滤掉引起循环的字段。

 

Java代码 复制代码
  1. JsonConfig config = new JsonConfig();   
  2. config.setIgnoreDefaultExcludes(false);      
  3. config.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);    
  4. config.registerJsonValueProcessor(Date.class,new DateJsonValueProcessor("yyyy-MM-dd")); //date processor register   
  5. config.setExcludes(new String[]{//只要设置这个数组,指定过滤哪些字段。   
  6.   "consignee",   
  7.   "contract",   
  8.   "coalInfo",   
  9.   "coalType",   
  10.   "startStation",   
  11.   "balanceMan",   
  12.   "endStation"  
  13. });   
  14. String tempStr = "{\"TotalRecords\":"+ total.toString() +",\"Datas\":"+JSONSerializer.toJSON(list,config).toString()+"}";   
  15. out.print(tempStr);  
 
 
2.设置JSON-LIB的setCycleDetectionStrategy属性让其自己处理循环,省事但是数据过于复杂的话会引起数据溢出或者效率低下。
Java代码 复制代码
  1. JsonConfig config = new JsonConfig();   
  2. config.setIgnoreDefaultExcludes(false);      
  3. config.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);    
  4. config.registerJsonValueProcessor(Date.class,new DateJsonValueProcessor("yyyy-MM-dd")); //date processor register   
  5. String tempStr = "{\"TotalRecords\":"+ total.toString() +",\"Datas\":"+JSONSerializer.toJSON(list,config).toString()+"}";   
  6. out.print(tempStr);  


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