xml解析详细

xml解析

1. Java中配置文件的三种配置位置及读取方式
1.1 XML和*.properties(属性文件)/ini
1.2 存放位置
1.2.1 src根目录下
类名.class.getResourceAsStream("/config.properties");
1.2.2 与读取配置文件的类在同一包
类名.class.getResourceAsStream(“config2.properties”);
1.2.3 WEB-INF(或其子目录下)
ServletContext application = this.getServletContext();
InputStream is =application.getResourceAsStream("/WEB-INF/config3.properties");

注：*.properties文件 使用key=value 键值对的方式，用 Properties.load()方法获取。

查一组数据 document.selectNodes(xpath);
查单个数据 document.selectSingleNode(xpath);
具体操作看下方代码：

*.properties文件的解析

	public static void main1(String[] args) throws IOException {//加载属性配置文件（根据属性配置文件的路径）InputStream is = Demo.class.getResourceAsStream("/test.properties");//定义属性类Properties properties=new Properties();properties.load(is);//取值String username = properties.getProperty("username");String password = properties.getProperty("password");System.out.println(username);System.out.println(password);}

xml文件解析

public static void main3(String[] args) throws DocumentException {//将xml文件变成字节流InputStream is = test.class.getResourceAsStream("config.xml");SAXReader sax=new SAXReader();Document document = sax.read(is);//将其写进文档对象中Element e = (Element) document.selectSingleNode("config/action[@path='/regAction']");//获取指定对象List s = e.selectNodes("forward");for (Element t : s) {String name = t.attributeValue("name");String path = t.attributeValue("path");String redirect = t.attributeValue("redirect");ConfigClass con=new ConfigClass();con.setName(name);con.setPath(path);con.setRedirect(redirect);System.out.println(con);}}public static void main2(String[] args) throws DocumentException {InputStream is = test.class.getResourceAsStream("config.xml");SAXReader sax=new SAXReader();Document document = sax.read(is);List e =(List)document.selectNodes("config/action[@path='/regAction']");for (Element el : e) {List n =el.selectNodes("forward");for (Element t : n) {String name = t.attributeValue("name");String path = t.attributeValue("path");String redirect = t.attributeValue("redirect");System.out.println(name+"--"+path+"--"+redirect);}String att = el.attributeValue("path");String att1 = el.attributeValue("type");System.out.println(att+"--"+att1);}}public static void main1(String[] args) throws DocumentException {InputStream is = test.class.getResourceAsStream("config.xml");SAXReader sax=new SAXReader();Document document = sax.read(is);List list = document.selectNodes("config/action");for (Element e : list) {Element n=(Element)e.selectSingleNode("forward");String name = n.attributeValue("name");String path = n.attributeValue("path");String redirect = n.attributeValue("redirect");System.out.println(name+"--"+path+"--"+redirect);String att = e.attributeValue("path");String att1 = e.attributeValue("type");System.out.println(att+"--"+att1);}}**今天的分享就到此结束，各位看官可以在下面评论出自己的看法，大家一起提升，谢谢各位！！！**

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