XML文件操作

1、创建XML文件

@Test
	public void testNewDoc() throws Exception{
		//创建新的xml文件
		Document doc=DocumentHelper.createDocument();
		//添加根元素
		Element root=doc.addElement("datasource");
		//添加根元素属性
		root.addAttribute("type","oracle");
		
		//添加子元素和文本
		root.addElement("user").addText("orc1");
		root.addElement("pwd").addText("123");
		
		
		FileOutputStream out=new FileOutputStream("out/a.xml");
		OutputFormat format=OutputFormat.createPrettyPrint();
		XMLWriter writer=new XMLWriter(out,format);
		writer.write(doc);
		writer.close();
		
	}

2、读XML文件

@Test
	public  void testSAXReader() throws Exception{
		InputStream in=TestCase.class.getResourceAsStream("contacts.xml");
		
		SAXReader reader=new SAXReader();
		Document doc=reader.read(in);//doc是树形数据结构
		
		in.close();
		System.out.println(doc.asXML());
		
		
	}

@Test
	public void testGetName() throws Exception{
		File file=new File("out/contacts.xml");
		SAXReader reader=new SAXReader();
		Document doc=reader.read(file);
		
		Element root=doc.getRootElement();
		
		List<Element> list=root.elements();
		
		Element first=list.get(0);
		
		Element name=first.element("name");
		String str=name.getText();
		System.out.println(str);
		
		String s=first.elementTextTrim("name");//和上面两行等价
		System.out.println(s);
	}

结果：tom

tom

@Test
	public void testAttr() throws Exception{
		File file=new File("out/books.xml");
		SAXReader reader=new SAXReader();
		Document doc=reader.read(file);
		Element root=doc.getRootElement();
		List<Element> list=root.elements();
		
		Element book=list.get(0);
		Attribute attr=book.attribute("language");
		System.out.println(attr.getName());
		System.out.println(attr.getValue());
	}

结果:language
CHN

3、修改XML文件

@Test
	public  void testModifyXML() throws Exception{
		File file=new File("out/contacts.xml");
		SAXReader reader=new SAXReader();
		Document doc=reader.read(file);
		
		Element root=doc.getRootElement();
		
		Element contact=root.addElement("contact");
		
		contact.addAttribute("id","3");
		
		contact.addElement("name").addText("apple");
		contact.addElement("phone").addText("111");
		contact.addElement("addr").addText("beijing");
		System.out.println(doc.asXML());
		
		FileOutputStream out=new FileOutputStream("out/contacts2.xml");
		
		OutputFormat format=OutputFormat.createPrettyPrint();
		
		XMLWriter writer=new XMLWriter(out,format);
		writer.write(doc);
		writer.close();
	}