如何在 SAX 解析器中获取属性值 [英] How to get the attribute value in the SAX parser

问题描述

我使用 SAXParser 来读取 xml 格式.然后 startelement 方法运行，但我不知道如何在方法中获取 url.我不知道解决方案是什么.谢谢

I have use the SAXParser to read the xml format. Then the startelement method run but I have no idea how to get the url in the method. I dont know what is the solution. Thank you

<enclosure length="1234567" type="image/jpeg" url="http://www.nasa.gov/images/content/664322main_31_lands_cropped_516-387.jpg"/> 

推荐答案

什么语言?什么实现?至少标记您要尝试使用的语言总是一个好主意.

What language? What implementation? It is always a good idea to at least tag which language you are trying to implement in.

想法是遍历startElement()函数/方法中的attributes参数:

The idea is to iterate through the attributes parameter in the startElement() function/method:

Java 解决方案:

public void startElement(String namespaceURI, String localName, String qName, Attributes atts)
{
   int len = atts.getLength();
   // Loop through all attributes and save them as needed
   for(int i = 0; i < len; i++)
   {
      String sAttrName = atts.getLocalName(i);
      if(sAttrName.compareTo("URL") == 0) 
      {
          String sVal = atts.getValue(i);
          // Do something with the *.jpg
      }
   }
}

C++ Xercesc 解决方案:

void MyClass::startElement(const XMLCh *const uri, const XMLCh *const localname,
                                  const XMLCh *const qname, const Attributes &attributes)
{
    // Loop through all attributes and save them as needed
    XMLSize_t len = attributes.getLength();
    for(XMLSize_t index = 0; index < len; index++)
    {
         CString cAttrName(attributes.getLocalName(index));
         if(cAttrName.Compare(L"URL") == 0)
         {
              CString cVal(attributes.getValue(index));
              // Do something with the *.jpg
         }

    }
}

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