如何獲取SAX解析器中的屬性值

Question

我使用SAXParser來讀取xml格式。然後運行startelement方法，但我不知道如何獲取方法中的url。我不知道解決方案是什麼。謝謝

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

Answer 1

的屬性將被傳入的startElement方法：

for (int i = 0; i < attrs.getLength(); i++) { 
    String attributeName = attrs.getLocalName(i); 
    String attributeValue = attrs.getValue(i); 
    System.out.println("found attribute with localname=" + attributeName 
    + " and value=" + attributeValue"); 
} 

Answer 2

什麼語言？什麼實施？它始終是一個好主意，至少標籤的語言，你正在試圖實現

的想法是通過在的startElement（）函數/方法的屬性參數進行迭代：

一個Java的解決方案：

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 
     } 
    } 
} 

A C++ Xercesc解決方案：

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 
     } 

    } 
} 

Answer 3

這裏是我在SAX ContentHandler嘗試;它返回屬性和鍵/值對。

private String mCurrentEl = null; 

/** on each element: start */ 
public void startElement (String uri, String localName, String qName, Attributes attrs) throws SAXException { 

    /** keeping a reference */ 
    mCurrentEl = localName; 

    /** each attribute */ 
    for (int i=0; i < attrs.getLength(); i++) { 
     String name = attrs.getLocalName(i); 
     String value = attrs.getValue(i); 
     System.out.println("attribute \"" + name + "\" has value \"" + value + "\"."); 
    } 

} 

/** on each element: data */ 
public void characters(char[] chars, int start, int length) throws SAXException { 
    String data = new String(chars, start, length).trim(); 
    if(! data.equals("") && mCurrentEl != null) { 
     System.out.println(mCurrentEl + ": " + data); 
    } 
} 

/** on each element: end */ 
public void endElement(String uri, String localName, String qName) throws SAXException { 
    mCurrentEl = null; 
}