如何在RESTClient返回XML数据后与SaxParser代码进行交互？

我需要解析从访问基于REST的服务返回的XML数据，以仅显示一个标签。例如，解析下面显示的XML数据以仅显示名字标记和值John。如何在RESTClient返回XML数据后与SaxParser代码进行交互？

<company> 
<staff> 
    <firstname>John</firstname> 
    <lastname>Doe</lastname> 

</staff> 

</company>

我一直在努力弄清楚一旦RESTClient返回XML数据后，如何与SAX解析代码进行接口。在学习了不同的示例代码后，我尝试了不同的方法，但仍然无法部分解读它，因为它们没有相同的确切目的。所以，请教我如何调用/将数据传递给解析代码以及从解析代码返回的内容，解析代码是否应该放在单独的类中，等等。我基本上没有一些指导就无能为力。相关的RESTClient代码如下所示。谢谢！

public class RESTClient { 

public static String callRESTService(String url) { 

    String result = null; 
    HttpClient httpclient = new DefaultHttpClient(); 

    // Prepare a request object 
    HttpGet httpget = new HttpGet(url); 

    // Execute the request 
    HttpResponse response; 
    try { 
     response = httpclient.execute(httpget); 

     // Get hold of the response entity 
     HttpEntity entity = response.getEntity(); 
     // If the response does not enclose an entity, there is no need 
     // to worry about connection release 

     if (entity != null) { 

      InputStream instream = entity.getContent(); 

      SAXParserFactory spf = SAXParserFactory.newInstance(); 
          SAXParser sp; 

      try (

       sp = spf.newSAXParser(); 
       XMLReader xr = sp.getXMLReader(); 


       DefaultHandler handler = new DefaultHandler(); 
       xr.setContentHandler(handler); 

       InputSource is = new InputSource(instream); 
       xr.parse(is); 

       //what should/can be returned here from the parsing code: 
       //String, InputSource, InputStream?. Convert data type? 


      } 


      catch (SAXException e) 
      { 

       e.printStackTrace(); 
      } 
      catch (ParserConfigurationException e) 
      { 

       e.printStackTrace(); 
      } 
     } 


    } catch (ClientProtocolException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
    return result; 
    } 
)

来源

2012-03-21 macrogeo

你必须实现你自己的'DefaultHandler' – zapl 2012-03-21 09:36:51