xml的解析方式

xml文档的解析有两种方式: 一是DOM解析,一是SAX
我们用的是dom4j的解析包,其对DOM和SAX都支持解析.
java自带以下是DOM解析.
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();		factory.setValidating(false);		DocumentBuilder builder = factory.newDocumentBuilder();		Document doc = builder.parse("src/students.xml");
      DOM4J获取Document对象: 		
		SAXReader reader = new SAXReader();		Document doc = reader.read("src/students.xml");
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java自带SAX的解析:
SAXParserFactory factory =SAXParserFactory.newInstance();
       SAXParser parser = factory.newSAXParser();
       parser.parse("src/students.xml",new DefaultHandler()); DefaultHandler-->需要创建实现这个DefaultHandler接口的实现类
Dom4j通过SAX获得document对象:
SAXReader reader = new SAXReader();
            Document doc = reader.read(input); input------>读取xml文件的内容
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回显或写入xml内容
OutputFormat format = OutputFormat.createPRettyPrint();        //设置输出编码        format.setEncoding("UTF-8");        //创建需要写入的File对象        File file = new File("D:" + File.separator + "books.xml");        //生成XMLWriter对象，构造函数中的参数为需要输出的文件流和格式        XMLWriter writer = new XMLWriter(new FileOutputStream(file), format);        //开始写入，write方法中包含上面创建的Document对象        writer.write(doc);
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另外, dom4j支持xpath的(查询)操作.
dom4j的下载地址为: https://sourceforge.net/projects/dom4j/files/dom4j/