xml相关

Document doc =DocumentHelper.CreateDocument();
获取文档对象
Document doc=new SAXReader().read("xxx.xml");

XMLWriter writer=new XMLWriter();
OutPutStream os=new FileOutputStream("src/resources/new.xml");
writer.setOutputStream(os);
//把内存中的数据写入到new.xml文件中
writer.write(document);
writer.close();

OutputFormat outformat=OutputFormat.createPrettyPrint();
outformat.setEncoding("UTF-8");
OutputStream os=new FileOutputStream("bin/resource/employee.xml");
XMLWriter writer=new XMLWriter(os,outformat);
//把内存中的数据写入employee.xml中
writer.write(document);
write.close();

public class Employee {
	private int id;
	private String name;
	private int age;
	private String gender;
	private double salary;
	
	public Employee(){}
	public Employee(int id, String name, int age, String gender, double salary) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
		this.gender = gender;
		this.salary = salary;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	public double getSalary() {
		return salary;
	}
	public void setSalary(double salary) {
		this.salary = salary;
	}
	@Override
	public String toString() {
		return "Employee [id=" + id + ", name=" + name + ", age=" + age + ", gender=" + gender + ", salary=" + salary
				+ "]";
	}
	
	
}

/**
 * 此类现实xpath用法
 * @author PC
 *
 */
public class Demo2 {
	@Test
	public void  test1()throws Exception{
		SAXReader reader=new SAXReader();
		//通过Demo的Class所在位置来定位到employee.xml
		InputStream is=Demo2.class.getClassLoader().getResourceAsStream("resources/employee.xml");
		Document doc=reader.read(is);
		//xpath用法
		List<Element> emps=doc.selectNodes("/list/employee[@id='3']");
		for(Element emp:emps){
			System.out.println("name="+emp.elementText("name"));
		}
		
	}
}

public class Demo1 {
	/**
	 * 获取文件的路径为相对路径
	 * 且当前路径是项目的根目录
	 * @param fileName
	 * @return
	 * @throws Exception 
	 */
	private Document readXML1(String fileName) throws Exception{
		Document doc=null;
		//创建一个SAXReader解析器
		SAXReader xmlReader=new SAXReader();
		doc=xmlReader.read(fileName);

		return doc;
	}
	/**
	 * 文件是从类路径中获取的
	 * @param fileName
	 * @return
	 * @throws Exception 
	 */
	private Document readXML2(String fileName) throws Exception{
		Document doc=null;
		//创建一个SAXReader解析器
		SAXReader xmlReader=new SAXReader();
		//从类路径中获取文件路径
		InputStream is=Demo1.class.getClassLoader().getResourceAsStream(fileName);
		doc=xmlReader.read(is);
		
		return doc;		
	}
	
	@Test
	public void test1(){
		try {
			Document doc=this.readXML1("bin/resources/employee.xml");
			System.out.println(doc);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	@Test
	public void test2(){
		try {
			Document doc=this.readXML2("resources/employee.xml");
			System.out.println(doc);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	/**
	 * 获取跟节点
	 */
	@Test
	public void test3(){
		try {
			Document doc=this.readXML2("resources/employee.xml");
//			System.out.println(doc);
			//从doc对象中取出根节点
			Element root=doc.getRootElement();
			System.out.println(root.getName());
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	/**
	 * 根据根节点,获取根节点下所有儿子的元素节点
	 */
	@Test
	public void test4(){

		List<Employee> emps=new ArrayList<Employee>();
		
		try {
			Document doc=this.readXML2("resources/employee.xml");
//			System.out.println(doc);
			//从doc对象中取出根节点
			Element root=doc.getRootElement();
//			System.out.println(root.getName());
			//获取根节点下的所有儿子的元素节点
			List<Element> employees=root.elements();
			
			
			for(Element employee:employees){
				//属性id
				int  id=Integer.parseInt(employee.attributeValue("id"));
				//获取name
				String name=employee.elementText("name");
				//获取age
				int age=Integer.parseInt(employee.element("age").getText());
				//获取性别
				String gender=employee.elementText("gender");
				//获取薪水
				double salary=Double.parseDouble(employee.elementText("salary"));
				Employee emp=new Employee(id,name,age,gender,salary);
				emps.add(emp);
				
				
			}
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println(emps);
	}
	/**
	 * 根据跟节点
	 * 获取根节点下的所有的儿子节点
	 * 用迭代器实现的
	 */
	@Test
	public void test5(){

		List<Employee> emps=new ArrayList<Employee>();
		
		try {
			Document doc=this.readXML2("resources/employee.xml");
//			System.out.println(doc);
			//从doc对象中取出根节点
			Element root=doc.getRootElement();
//			System.out.println(root.getName());
			//获取根节点下的所有儿子的元素节点
			Iterator<Element>  employees=root.elementIterator();
			while(employees.hasNext()){
				Element employee=employees.next();
				//属性id
				int  id=Integer.parseInt(employee.attributeValue("id"));
				//获取name
				String name=employee.elementText("name");
				//获取age
				int age=Integer.parseInt(employee.element("age").getText());
				//获取性别
				String gender=employee.elementText("gender");
				//获取薪水
				double salary=Double.parseDouble(employee.elementText("salary"));
				Employee emp=new Employee(id,name,age,gender,salary);
				emps.add(emp);
				
			}
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println(emps);
	}
	/**
	 * 写xml
	 * 1.创建Document
	 * 2.添加数据
	 * 3.生成xml
	 * @throws Exception 
	 */
	@Test
	public void test6() throws Exception{
		List<Employee> emps=new ArrayList<Employee>();
		//构建要添加的Employee的数据
		Employee emp1=new Employee(6,"aa",20,"男",2000);
		Employee emp2=new Employee(7,"bb",20,"男",2000);
		Employee emp3=new Employee(8,"cc",20,"男",2000);
		Employee emp4=new Employee(9,"dd",20,"男",2000);
		Employee emp5=new Employee(10,"ee",20,"男",2000);
		Employee emp6=new Employee(11,"ff",20,"男",2000);
		emps.add(emp1);
		emps.add(emp2);
		emps.add(emp3);
		emps.add(emp4);
		emps.add(emp5);
		emps.add(emp6);
		//1.创建Document对象
		Document doc=DocumentHelper.createDocument();
		//2.添加根节点
		Element root = doc.addElement("list");
		//3.循环添入数据
		for(Employee emp:emps){
			//给根节点下添加了一个Employee节点
			Element employee=root.addElement("employee");
			//给Employee节点添加信息
			employee.addAttribute("id",emp.getId()+" ");
			employee.addElement("name").addText(emp.getName());
			employee.addElement("age").addText(emp.getAge()+" ");
			employee.addElement("gender").addText(emp.getGender());
			employee.addElement("salary").addText(emp.getSalary()+" ");
			
		}
		//把内存中构建完的xml文档写入xml
		XMLWriter writer=new XMLWriter();
		OutputStream os=new FileOutputStream("src/resources/newemployee.xml");
		writer.setOutputStream(os);
		writer.write(doc);
		writer.close();
		
		
	}
	/**
	 * 写xml
	 * 1.创建Document
	 * 2.添加数据
	 * 3.生成xml
	 * @throws Exception 
	 */
	@Test
	public void test7() throws Exception{
		List<Employee> emps=new ArrayList<Employee>();
		//构建要添加的Employee的数据
		Employee emp1=new Employee(6,"aa",20,"男",2000);
		Employee emp2=new Employee(7,"bb",20,"男",2000);
		Employee emp3=new Employee(8,"cc",20,"男",2000);
		Employee emp4=new Employee(9,"dd",20,"男",2000);
		Employee emp5=new Employee(10,"ee",20,"男",2000);
		Employee emp6=new Employee(11,"ff",20,"男",2000);
		emps.add(emp1);
		emps.add(emp2);
		emps.add(emp3);
		emps.add(emp4);
		emps.add(emp5);
		emps.add(emp6);
		//1.创建Document对象
		Document doc=this.readXML2("resources/employee.xml");
		//2.添加根节点
		Element root = doc.getRootElement();
		//3.循环添入数据
		for(Employee emp:emps){
			//给根节点下添加了一个Employee节点
			Element employee=root.addElement("employee");
			//给Employee节点添加信息
			employee.addAttribute("id",emp.getId()+"");
			employee.addElement("name").addText(emp.getName()+"");
			employee.addElement("age").addText(emp.getAge()+"");
			employee.addElement("gender").addText(emp.getGender()+"");
			employee.addElement("salary").addText(emp.getSalary()+"");
			
		}
		//把内存中构建完的xml文档写入xml
		XMLWriter writer=new XMLWriter();
		OutputStream os=new FileOutputStream("src/resources/employee.xml");
		writer.setOutputStream(os);
		writer.write(doc);
		writer.close();
		
		
	}
	
	
}