如何从所有xml中获取特定字段的数据

Question

我的Xml响应中有这种来自服务器的数据，它以“NewDataSet”标签开始和结束，在这个标签下有几个“表”标签。在这个table标记中，我想从所有的Table标记中获取一些字段的值，比如CallDate，CallDuration。这样我就可以相应地显示数据。但在所有的网络教程中，他们都是在解析后显示数据的。所以我的问题是如何从这个Xml .I中所有表标签的特殊字段中获取数据。我确信我的问题已经很清楚了。请帮帮我

<NewDataSet>
<Table>
<CallDetailId>06012015192014733680011</CallDetailId>
<CallID>83A26D3811000100</CallID>
<CorrelatorId />
<EncryptedCall>false</EncryptedCall>
<CallDate>2015-01-06 19:20:14</CallDate>
<CalledBy>337</CalledBy>
<CalledTo>368</CalledTo>
<IsExternal>false</IsExternal>
<RecorderType>PRIMARY</RecorderType>
<FirstName />
<LastName />
<Comments />
<FlagID>1</FlagID>
<FlagImage>1.gif</FlagImage>
<CallDirection>I</CallDirection>
<FLAGTEXT>Training required</FLAGTEXT>
<Archive>true</Archive>
<ExtensionValue>368</ExtensionValue>
</Table>
<Table>
<AgentHangup>true</AgentHangup>
<CallDetailId>060120151424080020030003</CallDetailId>
<CallID>1F5D6D3803000100</CallID>
<CorrelatorId />
<CallDuration>5</CallDuration>
<EncryptedCall>false</EncryptedCall>
<CallDate>2015-01-06 14:24:08</CallDate>
<CalledBy>2003</CalledBy>
<CalledTo>210</CalledTo>
<IsExternal>false</IsExternal>
<RecorderType>PRIMARY</RecorderType>
<FirstName />
<LastName />
<Comments />
<FlagID>1</FlagID>
<FlagImage>1.gif</FlagImage>
<AF>C:\Program Files (x86)\Alcatel-Lucent\OmniPCXRecord Suite\OmniPCXRecord\OmniPCXRECORDAudio\Repository\from\150106\0207\202_06012015 142408003_0003_2003.wav</AF>
<CallDirection>O</CallDirection>
<FLAGTEXT>Training required</FLAGTEXT>
<Archive>false</Archive>
<ExtensionValue>2003</ExtensionValue>
<GraphValue />
</Table>

我正在做这个

    result = xmlStringComingFromServer
    Document dom = null;
                    DocumentBuilder builder;
                    DocumentBuilderFactory factory;
                    try {
                        InputStream resultStream = new ByteArrayInputStream(results.getBytes("utf-8"));
                        factory = DocumentBuilderFactory.newInstance();
                        builder = factory.newDocumentBuilder();
                        dom = builder.parse(resultStream);
                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    } catch (ParserConfigurationException e) {
                        e.printStackTrace();
                    } catch (SAXException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                    if (dom != null) {
                        Log.v("Dom is Not Null", dom.toString() + "");
                        NodeList nodeList = dom.getElementsByTagName("NewDataSet");



                        /*




                        putting new data here
                         */

                        menuItems = new ArrayList<HashMap<String, String>>();


//                        NodeList nl = dom.getElementsByTagName(KEY_ITEM);

                        // looping through all item nodes <item>
                        for (int i = 0; i < nodeList.getLength(); i++) {
                            // creating new HashMap
                            Log.v("For Rounds",i+"");
                            Element e = (Element)nodeList.item(i);

                            // adding each child node to HashMap key => value
                            map.put("Table",e.getElementsByTagName("Table").item(i).getTextContent());
                            //map.put(KEY_NAME, parser.getValue(e, KEY_NAME));
//                            map.put("CallDuration",e.getElementsByTagName("CallDuration").item(0).getTextContent());
//                            map.put("CalledBy",e.getElementsByTagName("CalledBy").item(0).getTextContent());
//                            map.put("CalledTo",e.getElementsByTagName("CalledTo").item(0).getTextContent());
//                            map.put("FirstName",e.getElementsByTagName("FirstName").item(0).getTextContent());
//                            map.put("LastName",e.getElementsByTagName("LastName").item(0).getTextContent());

                            // adding HashList to ArrayList
                            menuItems.add(map);
                    }

Answer 1

与加载Dom相比，您可以使用XmlPullParser更快地解析XML语言，并且更有效地利用内存。

 try {
      XmlPullParser xpp;
      XmlPullParserFactory factory = null;
        factory = XmlPullParserFactory.newInstance();
        xpp = factory.newPullParser();
        xpp.setInput(mInput, "UTF-8");

        String N = "";  //I know it's capitalized but that's how I do temp strings.

        int eventType = xpp.getEventType();
        while (true) {
            if (eventType == XmlPullParser.START_TAG) {
                // code taken from AsyncTask check cancel each loop your code 
                // may not need this check
                if (isCancelled()) {
                    return RESULT_ABORTED;  
                }
                N = xpp.getName();
                if (N.equals("CallDate")) {
                    String callDate = xpp.getText();
                } else if (N.equals("somethingelse")) {
                    String somethingelse = xpp.getText();
                }
            } else if (eventType == XmlPullParser.END_DOCUMENT) {
                break;
            }
            eventType = xpp.next();
        }

    } catch (XmlPullParserException e) {
        e.printStackTrace();
        ret = RESULT_ERROR;
    } catch (IOException e) {
        ret = RESULT_ERROR;
        e.printStackTrace();
    }