java读取xml配置_Java读取xml配置文件-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_42626599/article/details/114055839

该博客主要展示了如何使用Java的DOM解析器从XML文件中提取数据。通过`DocumentBuilderFactory`和`DocumentBuilder`，作者读取XML文件并遍历节点，根据指定的key查找并返回对应的节点值。示例中，查找了名为'HolderName1'的节点值。

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packagetest.com;importjava.io.FileInputStream;importjavax.xml.parsers.DocumentBuilder;importjavax.xml.parsers.DocumentBuilderFactory;importorg.w3c.dom.Document;importorg.w3c.dom.Element;importorg.w3c.dom.Node;importorg.w3c.dom.NodeList;public classXmlParser {public static void main(String[] args) throwsException {

getXML("src/parameters.xml", "HolderName1");

//readXmlFile("src/Accounts.xml");

}/*** @desc 根据key属性的值，获取节点的值

**/

public static String getXML(String sqlXMLPath, String node) throwsException {

DocumentBuilderFactory builderFactory=DocumentBuilderFactory.newInstance();

FileInputStream xmlInputStream= newFileInputStream(sqlXMLPath);

DocumentBuilder builder=builderFactory.newDocumentBuilder();

Document document=builder.parse(xmlInputStream);

Node n= document.getChildNodes().item(0);

NodeList nl=n.getChildNodes();for (int i = 0; i < nl.getLength(); i++) {if (!nl.item(i).getNodeName().equals("#text")) {

Element e=(Element) nl.item(i);

System.out.println(nl.item(i).getNodeName()+ "\t" + e.getAttribute("key") + "\t" +nl.item(i).getTextContent());

String key= e.getAttribute("key");

String value=nl.item(i).getTextContent();if(key.equals(node)) {returnvalue;

}

}return null;

}public static void readXmlFile(String fileName) throwsException {

FileInputStream xmlInputStream= newFileInputStream(fileName);

DocumentBuilderFactory dbf= DocumentBuilderFactory.newInstance(); //返回documentBuilderFactory对象

DocumentBuilder db = dbf.newDocumentBuilder();//返回db对象用documentBuilderFatory对象获得返回documentBuildr对象

Document dt = db.parse(xmlInputStream); //得到一个DOM并返回给document对象

Element element = dt.getDocumentElement();//得到一个elment根元素

System.out.println("根元素：" + element.getNodeName()); //获得根节点

NodeList childNodes = element.getChildNodes(); //获得根元素下的子节点

for (int i = 0; i < childNodes.getLength(); i++) //遍历这些子节点

{

Node node1= childNodes.item(i); //childNodes.item(i);//获得每个对应位置i的结点

if ("Account".equals(node1.getNodeName())) {//如果节点的名称为"Account"，则输出Account元素属性type

System.out.println("\r\n找到一个账号. 所属区域:s" + node1.getAttributes().getNamedItem("type").getNodeValue() + "$$");

NodeList nodeDetail= node1.getChildNodes(); //获得下的节点

for (int j = 0; j < nodeDetail.getLength(); j++) { //遍历下的节点

Node detail = nodeDetail.item(j); //获得元素每一个节点

if ("code".equals(detail.getNodeName())) //输出code

System.out.println("卡号: " +detail.getTextContent());else if ("pass".equals(detail.getNodeName())) //输出pass

System.out.println("密码: " +detail.getTextContent());else if ("name".equals(detail.getNodeName())) //输出name

System.out.println("姓名: " +detail.getTextContent());else if ("money".equals(detail.getNodeName())) //输出money

System.out.println("余额: " +detail.getTextContent());

}