解析XML的Htt presponse [英] Parsing a XML HttpResponse

问题描述

我试图解析XML型Htt presponse我从一个HttpPost到服务器（last.fm），对于last.fm的Andr​​oid应用程序。如果我简单地将它解析为字符串我可以看到它是一个正常的XML字符串，与所有需要的信息。但我只是不能解析单namevaluepairs中。这是我的Htt presponse对象：

I'm trying to parse the XML HttpResponse i get from a HttpPost to a server (last.fm), for a last.fm android app. If i simply parse it to string i can see it being a normal xml string, with all the desired information. But i just cant parse the single NameValuePairs. This is my HttpResponse object:

HttpResponse response = client.execute(post);
HttpEntity r_entity = response.getEntity();

我试过两个不同的东西，非他们的工作。首先，我试图找回namevaluepairs中：

I tried two different things and non of them worked. First i tried to retrieve the NameValuePairs:

List<NameValuePair> answer = URLEncodedUtils.parse(r_entity);
String name = "empty";
String playcount = "empty";
for (int i = 0; i < answer.size(); i++){
   if (answer.get(i).getName().equals("name")){
      name = answer.get(i).getValue();
   } else if (answer.get(i).getName().equals("playcount")){
      playcount = answer.get(i).getValue();
   }
}

在此code，姓名和playcount保持空。所以我试图用一个XML解析器：

After this code, name and playcount remain "empty". So i tried to use a XML Parser:

DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document answer = db.parse(new DataInputStream(r_entity.getContent()));
NodeList nl = answer.getElementsByTagName("playcount");
String playcount = "empty";
for (int i = 0; i < nl.getLength(); i++) {
   Node n = nl.item(i);
   Node fc = n.getFirstChild();
   playcount Url = fc.getNodeValue();
}

这似乎更早地失败，因为它甚至没有去设置playcount变量。但是就像我说，如果我执行这样的：

This seems to fail much earlier since it doesn't even get to setting the playcount variable. But like i said if i perform this:

EntityUtils.toString(r_entity);

我会得到一个完美的XML字符串。所以应该没有问题的标准杆，因为工作的Htt presponse包含正确的信息。我究竟做错了什么？

I will get a perfect xml string. So it should no problem to pars it since the HttpResponse contains the correct information. What am i doing wrong?

推荐答案

我解决了它。 DOM的XML解析器需要更多一点的调整：

I solved it. The DOM XML parser needed a little more adjustment:

        HttpResponse response = client.execute(post);
        HttpEntity r_entity = response.getEntity();
        String xmlString = EntityUtils.toString(r_entity);
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = factory.newDocumentBuilder();
        InputSource inStream = new InputSource();
        inStream.setCharacterStream(new StringReader(xmlString));
        Document doc = db.parse(inStream);  

        String playcount = "empty";
        NodeList nl = doc.getElementsByTagName("playcount");
        for(int i = 0; i < nl.getLength(); i++) {
            if (nl.item(i).getNodeType() == org.w3c.dom.Node.ELEMENT_NODE) {
                 org.w3c.dom.Element nameElement = (org.w3c.dom.Element) nl.item(i);
                 playcount = nameElement.getFirstChild().getNodeValue().trim();
             }
        }

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