java修改xml

上几天工作需要大量的xml文档，文档的docid不能重复，所以就写了一个方法来实现，记录下来以免丢掉。

private static void ChangeId(File file,int i)throws DocumentException, IOException{
        UUID  uuid = UUID.randomUUID();
        SAXReader saxReader = new SAXReader();
           Document document = saxReader.read(file);
           List list = document.selectNodes("/document/header/docinfo/id/@value" );
           Iterator iter=list.iterator();
           while(iter.hasNext()){
               Attribute attribute=(Attribute)iter.next();
               attribute.setValue("2.16.156.12345.1.1000.204.403.167303."+i); 
            }
           File f = new File("C:/ufida/deploy/EHR_GATEWAY/EHR_GATEWAY_ADPT/XMLDATA/"+i/10000+"/");
           f.mkdir();
           OutputFormat format = OutputFormat.createPrettyPrint();
            format.setEncoding("utf-8");
        XMLWriter output = new XMLWriter(
                  ( new FileOutputStream("C:/ufida/deploy/EHR_GATEWAY/EHR_GATEWAY_ADPT/XMLDATA/"+i/10000+"/"+uuid.toString()+".xml") ),format);
                 output.write( document );
                 output.close();

    }