分别使用DOM和DOM4j解析XML文件

package exam3; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.Element; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.Iterator; public class Dom4j { Document doc; private String name,age,school; //获得dom树 public void getDom(File file){ SAXReader reader=new SAXReader(); try { this.doc=reader.read(file); } catch (DocumentException e) { e.printStackTrace(); } } //解析XML文档 public void showXML(){ //获取根节点 students Element root = doc.getRootElement(); //迭代输出根节点的子节点 student Iterator<Element> itStu = root.elementIterator("student"); while (itStu.hasNext()){ Element stuEle = itStu.next(); //1.根据name节点获得姓名 Iterator<Element> itName = stuEle.elementIterator("name"); while (itName.hasNext()){ Element nameEle = itName.next(); this.name = nameEle.getText(); //2.根据age标签获得年龄 Iterator<Element> itAge = stuEle.elementIterator("age"); while(itAge.hasNext()){ Element ageEle = itAge.next(); this.age= ageEle.getText(); } //3.根据school标签获得学校 Iterator<Element> itSchool = stuEle.elementIterator("school"); while(itSchool.hasNext()){ Element schoolEle = itSchool.next(); this.school= schoolEle.getText(); } Student stu=new Student(name,age,school); stu.showInfo(); } } } //保存文件 public void save(File file){ XMLWriter writer=null; try { writer=new XMLWriter(new FileOutputStream(file)); writer.write(doc); } catch (IOException e) { e.printStackTrace(); }finally { try { writer.close(); } catch (IOException e) { e.printStackTrace(); } } System.out.println("保存成功"); } //添加 public void add(){ //查找根节点 Element root = doc.getRootElement(); //根据根节点创建新的student节点 Element stuEle = root.addElement("student"); //设置新节点的属性 stuEle.addAttribute("type","保送"); //1.student新节点的子节点 name Element nameEle = stuEle.addElement("name"); //name节点的文本值 nameEle.addText("王五"); //2.子节点 age Element ageEle = stuEle.addElement("age"); //age文本值 ageEle.addText("20"); //3.子节点 school Element schoolEle = stuEle.addElement("school"); //name文本值 schoolEle.addText("清华"); System.out.println("添加成功"); } //修改 public void modfiy(){ //查找根节点 Element root = doc.getRootElement(); //给studunet节点type属性值为"保送"的替换成"自考" Iterator<Element> itStu = root.elementIterator("studnent"); while (itStu.hasNext()) { //转换为元素节点 Element stuEle=itStu.next(); //不能为空 if (stuEle.attributeValue("type")!=null){ if (stuEle.attributeValue("type").equals("保送")) { //修改 stuEle.attribute("type").setValue("自考"); } } //给name节点文本值为张三的添加属性sex:男 Iterator<Element> itName = stuEle.elementIterator("name"); while(itName.hasNext()){ Element nameEle = itName.next(); if(nameEle.getText().equals("张三")){ nameEle.addAttribute("sex","男"); } } System.out.println("修改成功"); } } //删除 public void delete(){ //查找根节点 Element root = doc.getRootElement(); //遍历studnet节点 Iterator<Element> Itstu = root.elementIterator("student"); while (Itstu.hasNext()) { Element stuEle = Itstu.next(); if(stuEle.attributeValue("type")!=null){ if(stuEle.attributeValue("type").equals("保送")){ //通过父节点删除 stuEle.getParent().remove(stuEle); } } } System.out.println("删除成功"); } }