xml相关

public class TXML{
public static void main(String[] args) {
try {
File file = new File("d:/test.xml");
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(file);
NodeList nodeList = doc.getElementsByTagName("dataset");
for (int i = 0; i < nodeList.getLength(); i++) {
//System.out.println(doc.getElementsByTagName("bb_cargo_no").item(i).getFirstChild().getNodeValue());
//System.out.println(doc.getElementsByTagName("bb_operate_date").item(i).getFirstChild().getNodeValue());
}
//这种方法比dom解析xml文件更高效；dom解析会把xml文件解析为一个树结构，如果大数据非常占用资源。
SAXReader reader = new SAXReader();
org.dom4j.Document xmlDoc=reader.read(file);
Element root = xmlDoc.getRootElement();
Iterator ee = root.elementIterator();
while(ee.hasNext()) {
Element ww = (Element) ee.next();
//System.out.println(ww.getName()+","+ww.getData());
}

} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
}
TXML.writeDocument(TXML.getDocument(),"d:/a.xml");
}

public static org.dom4j.Document getDocument(){
org.dom4j.Document document = DocumentHelper.createDocument();
//生成一个接点
Element root = document.addElement("root");
//生成root的一个接点
Element category = root.addElement("category");
Element name = root.addElement("name");
//生产category的一个接点
Element id = category.addElement("id");
Element username = name.addElement("username");
//生成id里面的参数值
id.addAttribute("name","id");
username.addAttribute("name","username");
//生成id里面的值
id.addText("1");
username.addText("张三");
return document;
}

public static void writeDocument(org.dom4j.Document document,String outFile){
try{
//读取文件
FileWriter fileWriter = new FileWriter(outFile);
//设置文件编码
OutputFormat xmlFormat = new OutputFormat();
xmlFormat.setEncoding("UTF-8");
//创建写文件方法
XMLWriter xmlWriter = new XMLWriter(fileWriter,xmlFormat);
//写入文件
xmlWriter.write(document);
//关闭
xmlWriter.close();
}catch(IOException e){
System.out.println("文件没有找到");
e.printStackTrace();
}
}
}

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