利用反射与dom4j读取javabean生成对应XML和读取XML得到对应的javabean对象集合

首先实现生成对应的JAVAbean的XML文件方法/*** DMO4J写入XML* @param obj 泛型对象* @param entityPropertys 泛型对象的List集合* @param Encode XML自定义编码类型(推荐使用GBK)* @param XMLPathAndName XML文件的路径及文件名*/publicvoid writeXmlDocument(T obj, List<T> entityPropertys, String Encode,String XMLPathAndName) {long lasting = System.currentTimeMillis();//效率检测try {XMLWriter writer = null;// 声明写XML的对象OutputFormat format = OutputFormat.createPrettyPrint();format.setEncoding(Encode);// 设置XML文件的编码格式String filePath = XMLPathAndName;//获得文件地址File file = new File(filePath);//获得文件if (file.exists()) {file.delete();}// 新建student.xml文件并新增内容 Documentdocument = DocumentHelper.createDocument();String rootname =obj.getClass().getSimpleName();//获得类名Element root = document.addElement(rootname + "s");//添加根节点 Field[] properties =obj.getClass().getDeclaredFields();//获得实体类的所有属性for (T t : entityPropertys) { //递归实体 Element secondRoot =root.addElement(rootname); //二级节点for (int i = 0; i < properties.length; i++) {//反射get方法 Method meth =t.getClass().getMethod("get"+properties[i].getName().substring(0, 1).toUpperCase()+properties[i].getName().substring(1));//为二级节点添加属性，属性值为对应属性的值secondRoot.addElement(properties[i].getName()).setText(meth.invoke(t).toString());}}//生成XML文件 writer = new XMLWriter(new FileWriter(file), format);writer.write(document);writer.close();long lasting2 = System.currentTimeMillis();System.out.println("写入XML文件结束,用时"+(lasting2 - lasting)+"ms");} catch (Exception e) {System.out.println("XML文件写入失败");}测试此方法/*** DOM4J读写XML示例** @param args* @throws Exception*/publicstaticvoid main(String[] args) {DOM4JTest<User> d = new DOM4JTest<User>(); User user = new User();User user1 = new User("姓名1", "18", "男"); User user2 = new User("姓名2", "19", "女"); User user3 = new User("石头", "20", "女");List<User> users = new ArrayList<User>(); users.add(user1);users.add(user2);users.add(user3);d.writeXmlDocument(user, users, "GBK", "WebRoot\\WEB-INF\\student.xml");}此时得到的XML文件如下view plaincopy to clipboardprint?<?xml version="1.0" encoding="GBK"?><Users><User><name>姓名1</name><age>18</age><sax>男</sax></User><User><name>姓名2</name><age>19</age><sax>女</sax></User><User><name>石头</name><age>20</age><sax>女</sax></User></Users>实现读取XML文件得到对象集合的方法/**** @param XMLPathAndName XML文件的路径和地址* @param t 泛型对象* @return*/@SuppressWarnings("unchecked")public List<T> readXML(String XMLPathAndName, T t) { long lasting = System.currentTimeMillis();//效率检测List<T> list = new ArrayList<T>();//创建list集合try {File f = new File(XMLPathAndName);//读取文件SAXReader reader = new SAXReader();Document doc = reader.read(f);//dom4j读取Element root = doc.getRootElement();//获得根节点Element foo;//二级节点 Field[] properties =t.getClass().getDeclaredFields();//获得实例的属性//实例的get方法 Method getmeth; //实例的set方法 Method setmeth;for (Iterator i =root.elementIterator(t.getClass().getSimpleName());i.hasNext();) {//遍历t.getClass().getSimpleName()节点foo = (Element) i.next();//下一个二级节点t=(T)t.getClass().newInstance();//获得对象的新的实例for (int j = 0; j < properties.length; j++) {//遍历所有孙子节点//实例的set方法setmeth = t.getClass().getMethod("set"+properties[j].getName().substring(0, 1).toUpperCase()+properties[j].getName().substring(1),properties[j].getTyp e());//properties[j].getType()为set方法入口参数的参数类型(Class类型) setmeth.invoke(t,foo.elementText(properties[j].getName()));//将对应节点的值存入}list.add(t);}} catch (Exception e) {e.printStackTrace();}long lasting2 = System.currentTimeMillis();System.out.println("读取XML文件结束,用时"+(lasting2 - lasting)+"ms");return list;测试：publicstaticvoid main(String[] args) {DOM4JTest<User> d = new DOM4JTest<User>();User user = new User();List<User> list=d.readXML("WebRoot\\WEB-INF\\student.xml",user);System.out.println("XML文件读取结果");for(int i =0;i<list.size();i++){User usename=(User)list.get(i);System.out.println("name"+usename.getName()); System.out.println("age"+usename.getAge());System.out.println("sax"+usename.getSax());}}控制台打印结果：name姓名1age18sax男name姓名2age19sax女name石头age20sax女。