【java开发系列】—— JDOM创建、修改、删除、读取XML文件

Element.setAttribute 为元素添加信息

Element.addContent(String,String) 为元素添加子元素内容，也可以直接添加另一个元素节点

Document.setRootElement(Element) 为文档添加根元素

XMLOutputter.output(Document,FileWriter) 将Docuemnt写入到FileWriter文件流中

 1     @SuppressWarnings("null")
 2     public static void createXML() {
 3         // 创建document
 4         Document mydoc = new Document();
 5 
 6         // 创建元素person1
 7         Element person1 = new Element("person");
 8         person1.setAttribute("id", "ID001");
 9         // 添加注释
10         person1.addContent(new Comment("this is person1"));
11 
12         person1.addContent(new Element("name").setText("xingoo"));
13         person1.addContent(new Element("age").setText("25"));
14         person1.addContent(new Element("sex").setText("M"));
15         // 可以嵌套添加子元素
16         Element address1 = new Element("address");
17         address1.setAttribute("zone", "province");
18         address1.addContent("LiaoNing");
19         person1.addContent(address1);
20 
21         // 创建元素person2
22         Element person2 = new Element("person");
23         person2.setAttribute("id", "ID002");
24         // 添加注释
25         person2.addContent(new Comment("this is person2"));
26 
27         person2.addContent(new Element("name").setText("xhalo"));
28         person2.addContent(new Element("age").setText("26"));
29         person2.addContent(new Element("sex").setText("M"));
30         // 可以嵌套添加子元素
31         Element address2 = new Element("address");
32         address2.setAttribute("zone", "province");
33         address2.addContent("JiLin");
34         person2.addContent(address2);
35 
36         // 在doc中添加元素Person
37         Element info = new Element("information");
38         info.addContent(person1);
39         info.addContent(person2);
40         mydoc.setRootElement(info);
41         
42         saveXML(mydoc);
43     }

 1     public static void saveXML(Document doc) {
 2         // 将doc对象输出到文件
 3         try {
 4             // 创建xml文件输出流
 5             XMLOutputter xmlopt = new XMLOutputter();
 6 
 7             // 创建文件输出流
 8             FileWriter writer = new FileWriter("person.xml");
 9 
10             // 指定文档格式
11             Format fm = Format.getPrettyFormat();
12             // fm.setEncoding("GB2312");
13             xmlopt.setFormat(fm);
14 
15             // 将doc写入到指定的文件中
16             xmlopt.output(doc, writer);
17             writer.close();
18         } catch (Exception e) {
19             e.printStackTrace();
20         }
21     }

SAXBuilder.build("xxx.xml") 解析XML文档

Document.getRootElement() 获取根元素

Element.getChildren() 获取根元素下的子元素，返回List<Element>

Element.getAttributeValue(String) 获取指定元素的信息

Element.getChildText 获取指定元素的内容

 1     public static void readXML() {
 2         // 使用SAXBuilder解析器解析xml文件
 3         SAXBuilder sb = new SAXBuilder();
 4         Document doc = null;
 5         try {
 6             doc = sb.build("person.xml");
 7             Element root = doc.getRootElement();
 8             List<Element> list = root.getChildren("person");
 9             for (Element el : list) {
10                 String id = el.getAttributeValue("id");
11                 String name = el.getChildText("name");
12                 String age = el.getChildText("age");
13                 String sex = el.getChildText("sex");
14                 System.out.println("id:" + id);
15                 System.out.println("name:" + name);
16                 System.out.println("age:" + age);
17                 System.out.println("sex:" + sex);
18                 System.out.println("--------------------------");
19             }
20         } catch (Exception e) {
21             e.printStackTrace();
22         }
23     }

 1     public static void updateXML(){
 2         SAXBuilder sb = new SAXBuilder();
 3         Document doc = null;
 4         try {
 5             doc = sb.build("person.xml");
 6             Element root = doc.getRootElement();
 7             List<Element> list = root.getChildren("person");
 8             for (Element el : list) {
 9                 if (el.getAttributeValue("id").equals("ID001")) {
10                     Element name = el.getChild("name");
11                     name.setText("xingoo---update");
12                 }
13             }
14         } catch (Exception e) {
15             e.printStackTrace();
16         }
17         saveXML(doc);
18     }

 1     public static void removeXML() {
 2         SAXBuilder sb = new SAXBuilder();
 3         Document doc = null;
 4         try {
 5             doc = sb.build("person.xml");
 6             Element root = doc.getRootElement();
 7             List<Element> list = root.getChildren("person");
 8             for (Element el : list) {
 9                 if (el.getAttributeValue("id").equals("ID001")) {
10                     root.removeContent(el);
11                 }
12             }
13         } catch (Exception e) {
14             e.printStackTrace();
15         }
16         saveXML(doc);
17     }