自动更新--解析xml文件（1）

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1. 解析xml文档

1.1 根据字符串类型的文件名字解析xml文件

/* * 解析xml文件 * xml文件实例如下： <?xml version="1.0" encoding="utf-8"?> <employees> <employee> <name>ddviplinux</name> <sex>m</sex> <age>30</age> </employee> <employee> <name>李路</name> <sex>女</sex> <age>20</age> </employee> </employees> * */public  void parseXml(String fileName) {try { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); Document document = db.parse(fileName); NodeList employees = ((Node) document).getChildNodes(); //System.out.println(employees.getLength());//length = 1  代表标签<employees>for (int i = 0; i < employees.getLength(); i++) { Node employee = employees.item(i); NodeList employeeInfo = employee.getChildNodes(); //System.out.println(employeeInfo.getLength()); //length = 5 代表标签<employee> </employee> <employee> </employee> </employees> for (int j = 0; j < employeeInfo.getLength(); j++) { if(j%2 == 0) continue; //在执行到标签</employee>的时候才能读取<employee> </employee>中间的数据Node node = employeeInfo.item(j); NodeList employeeMeta = node.getChildNodes(); //System.out.println(j+" "+employeeMeta.getLength()); //length = 7 代表标签 <name> </name> <sex> </sex> <age> </age> </employee>for (int k = 0; k < employeeMeta.getLength(); k++) { if(k%2 == 0) continue; //在执行到标签</name>的时候能读取<name> </name>中间的数据 下面的性别和年龄同上。System.out.println(employeeMeta.item(k).getNodeName() + ":" + employeeMeta.item(k).getTextContent()); } }}System.out.println("解析完毕"); } catch (FileNotFoundException e) { System.out.println(e.getMessage()); } catch (ParserConfigurationException e) { System.out.println(e.getMessage()); } catch (SAXException e) { System.out.println(e.getMessage());} catch (IOException e) { System.out.println(e.getMessage()); } }

1.2 根据数据流解析xml文件到HashMap

/* * xml文件示例 * <?xml version="1.0" encoding="utf-8"?><update>    <version>1.7</version>    <name>CerClient</name>    <url>http://gdown.baidu.com/data/wisegame/f98d235e39e29031/baiduxinwen.apk</url></update> * */public class ParseXmlService {public HashMap<String, String> parseXml(InputStream inStream) throws Exception    {        HashMap<String, String> hashMap = new HashMap<String, String>();                // 实例化一个文档构建器工厂        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();        // 通过文档构建器工厂获取一个文档构建器        DocumentBuilder builder = factory.newDocumentBuilder();        // 通过文档通过文档构建器构建一个文档实例        Document document = builder.parse(inStream);        //获取XML文件根节点        Element root = document.getDocumentElement();        //获得所有子节点        NodeList childNodes = root.getChildNodes();        for (int j = 0; j < childNodes.getLength(); j++)        {            //遍历子节点            Node childNode = (Node) childNodes.item(j);            if (childNode.getNodeType() == Node.ELEMENT_NODE)            {                Element childElement = (Element) childNode;                //版本号                if ("version".equals(childElement.getNodeName()))                {                    hashMap.put("version",childElement.getFirstChild().getNodeValue());                }                //软件名称                else if (("name".equals(childElement.getNodeName())))                {                    hashMap.put("name",childElement.getFirstChild().getNodeValue());                }                //下载地址                else if (("url".equals(childElement.getNodeName())))                {                    hashMap.put("url",childElement.getFirstChild().getNodeValue());                }            }        }        return hashMap;    }}

参考网址：

1.http://developer.51cto.com/art/200903/117512.htm

2.http://www.cnblogs.com/coolszy/archive/2012/04/27/2474279.html

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