XML两种读取和写入方式的例子：dom4j和jdom

一、dom4j 读写改操作，先导入jar包-1 

例子1：

 1 　　　   //dom4j读取
 2         SAXReader reader = new SAXReader();
 3         //文档对象
 4         Document document = reader.read(new File("F:\\yujun\\javaweb\\第一章\\student.xml"));
 5         //根节点对象
 6         Element root = document.getRootElement();
 7         //取得根节点的所有子节点集合
 8         List<Element> chs = root.elements();
 9
10         for(Element ch : chs) {
11             String no = ch.attributeValue("no"); //取得属性值
12             String name = ch.elementText("name");//取得子节点的文本值
13             String sex = ch.elementText("sex");//取得子节点的文本值
14             String age = ch.elementText("age");//取得子节点的文本值
15
16             System.out.println("学号:"+no+",姓名:"+name+",性别:"+sex+",年龄:"+age);
17         }

例子2：

 1         //dom4j创建新xml文件
 2         //文档
 3         Document document = DocumentHelper.createDocument();
 4         //根节点
 5         Element root = DocumentHelper.createElement("stus");
 6         //把根节点放入文档对象中
 7         document.setRootElement(root);
 8
 9         //创建stu的子节点
10         Element stu = root.addElement("stu");
11         stu.addAttribute("no", "001"); //添加属性
12         //给stu节点创建子节点
13         Element name = stu.addElement("name");
14         Element sex = stu.addElement("sex");
15         Element age = stu.addElement("age");
16         //给子节点赋值
17         name.setText("张三");
18         sex.setText("女");
19         age.setText("20");
20
21         //输出
22         XMLWriter writer = new XMLWriter(new FileOutputStream(new File("F:\\\\yujun\\\\javaweb\\\\第一章\\\\student3.xml")));
23         writer.write(document);
24         writer.close();
25         System.out.println("创建成功");

例子3：

 1         //dom4j给xml文件添加节点数据
 2
 3         //reader
 4         SAXReader reader = new SAXReader();
 5         //文档对象
 6         Document document = reader.read(new File("F:\\\\\\\\yujun\\\\\\\\javaweb\\\\\\\\第一章\\\\\\\\student3.xml"));
 7         //根节点
 8         Element root = document.getRootElement();
 9
10         //创建子节点(stu)
11         Element stu = root.addElement("stu");
12         //创建孙子节点
13         Element name = stu.addElement("name");
14         Element sex = stu.addElement("sex");
15         Element age = stu.addElement("age");
16         //赋值
17         stu.addAttribute("no", "002");
18         name.setText("李四");
19         sex.setText("女");
20         age.setText("30");
21
22         //把根节点重置到文档对象中
23         document.setRootElement(root);
24
25         //输出
26         XMLWriter writer = new XMLWriter(new FileOutputStream(new File("F:\\\\yujun\\\\javaweb\\\\第一章\\\\student3.xml")));
27         writer.write(document);
28         writer.close();
29         System.out.println("添加成功");

例子4：

 1         //使用deom4j修改xml文件数据
 2
 3         SAXReader reader = new SAXReader();
 4         Document document = reader.read(new File("F:\\yujun\\javaweb\\第一章\\student3.xml"));
 5         Element root = document.getRootElement();
 6
 7         List<Element> chs = root.elements();
 8         //stu
 9         for(Element ch : chs) {
10             String no =  ch.attributeValue("no");
11             if("002".equals(no)) {
12                 Element age = ch.element("age");//取得孩子节点
13                 age.setText("40");
14
15                 //删除节点
16                 //root.remove(ch);
17
18                 break;
19             }
20         }
21
22         //把根节点重置到文档对象中
23         document.setRootElement(root);
24
25         //输出
26         XMLWriter writer = new XMLWriter(new FileOutputStream(new File("F:\\yujun\\javaweb\\第一章\\student3.xml")));
27         writer.write(document);
28         writer.close();
29         System.out.println("修改成功");

二、jdom 读写改操作，先导入jar包-1 

例子1：

 1         //使用jdom解析mxl
 2
 3         //创建builder对象
 4         SAXBuilder builder = new SAXBuilder();
 5
 6         //通过xml文件构建文档对象
 7         Document document = builder.build(new File("F:\\yujun\\javaweb\\第一章\\student.xml"));
 8
 9
10         //获取文档中的根节点对象
11         Element root = document.getRootElement();
12
13         //获取根节点下的所有子节点对象集合
14         List<Element> chs =  root.getChildren();
15
16
17         for(Element ch : chs) {
18             //获取属性的值
19             String no = ch.getAttributeValue("no");
20             //获取子节点的文本值
21             String name = ch.getChildText("name");
22             String sex = ch.getChildText("sex");
23             String age = ch.getChildText("age");
24
25             /*Element cla =  ch.getChild("class");
26             String claId = cla.getChildText("id");
27             String claName = cla.getChildText("name");*/
28
29             //System.out.println("学号:"+no+",姓名:"+name+",性别:"+sex+",年龄:"+age+",班级id:"+claId+",班级名次:"+claName);
30             System.out.println("学号:"+no+",姓名:"+name+",性别:"+sex+",年龄:"+age);
31         }

例子2：

 1         //使用jdom创建新xml文件
 2
 3         //创建各给节点
 4         Element stu = new Element("stu");
 5         Element name = new Element("name");
 6         Element sex = new Element("sex");
 7         Element age = new Element("age");
 8
 9         //给节点赋值
10         name.setText("赵六");
11         sex.setText("女");
12         age.setText("40");
13
14         //关系
15         stu.addContent(name);
16         stu.addContent(sex);
17         stu.addContent(age);
18         stu.setAttribute("no", "004"); //设置属性
19
20         //根节点
21         Element stus = new Element("stus");
22         stus.addContent(stu);
23         Document document = new Document(stus);
24
25         //格式化对象
26         Format format = Format.getCompactFormat();
27         format.setIndent("    ");//缩进
28
29
30         //输出对象
31         XMLOutputter out = new XMLOutputter(format);
32         out.output(document, new FileOutputStream(new File("F:\\yujun\\javaweb\\第一章\\student2.xml")));
33         System.out.println("创建成功");

例子3：

 1         //使用jdom给xml文件添加节点数据
 2
 3         //builder对象
 4         SAXBuilder builder = new SAXBuilder();
 5         //文档对象
 6         Document document = builder.build(new File("F:\\\\yujun\\\\javaweb\\\\第一章\\\\student2.xml"));
 7
 8         //创建节点数据
 9         Element stu = new Element("stu");
10         Element name = new Element("name");
11         Element sex = new Element("sex");
12         Element age = new Element("age");
13         //给节点赋值
14         name.setText("abc");
15         sex.setText("女");
16         age.setText("50");
17         stu.setAttribute("no","006");
18         //关系
19         stu.addContent(name);
20         stu.addContent(sex);
21         stu.addContent(age);
22
23         //获取根节点
24         Element root = document.getRootElement();
25         root.addContent(stu);
26
27         //把root节点更新到文档中
28         document.setContent(root);
29
30         //输出对象
31         XMLOutputter out = new XMLOutputter();
32         out.output(document, new FileOutputStream(new File("F:\\\\\\\\yujun\\\\\\\\javaweb\\\\\\\\第一章\\\\\\\\student2.xml")));
33         System.out.println("添加节点数据成功");

例子4：

 1         //使用jdom修改节点数据
 2         //修改学号006的性别为：男
 3
 4         //builder对象
 5         SAXBuilder builder = new SAXBuilder();
 6         Document document = builder.build(new File("F:\\\\\\\\yujun\\\\\\\\javaweb\\\\\\\\第一章\\\\\\\\student2.xml"));
 7
 8         //根节点
 9         Element root = document.getRootElement();
10         List<Element> chs = root.getChildren();
11         for(Element ch : chs) {
12             String no = ch.getAttributeValue("no");
13             if("006".equals(no)) {
14                 Element sex = ch.getChild("sex");
15                 sex.setText("男");
16
17                 //删除
18                 //root.removeContent(ch);
19
20                 break;
21             }
22         }
23
24         document.setContent(root);
25         XMLOutputter out = new XMLOutputter();
26         out.output(document, new FileOutputStream(new File("F:\\\\\\\\yujun\\\\\\\\javaweb\\\\\\\\第一章\\\\\\\\student2.xml")));
27         System.out.println("修改成功");

原文地址：https://www.cnblogs.com/chyxOne/p/9762225.html