Jdom操作、创建和解析XML
需要导入Jdom的一个jar包; 1、Jdom创建XML import java.io.FileWriter; import org.jdom.Attribute; import org.jdom.Comment; import org.jdom.Document; import org.jdom.Element; import org.jdom.output.Format; import org.jdom.output.XMLOutputter; public class JDomTest1 { public static void main(String[] args) throws Exception { //创建文档 Document document = new Document(); //创建文档根元素 Element root = new Element("root"); //向文档呢添加根元素 document.addContent(root); //添加注释 Comment comment = new Comment("This is my comments"); //在根元素下添加注释 root.addContent(comment); //创建一个元素 Element e = new Element("hello"); //给元素添加属性的第一种方式,它有返回值,返回一个Element对象 e.setAttribute("sohu", "www.sohu.com"); //给根元素添加属性 root.addContent(e); Element e2 = new Element("world"); //创建元素属性的第二种方式 Attribute attr = new Attribute("test", "hehe"); //给元素添加属性 e2.setAttribute(attr); //将元素添加到根元素下 e.addContent(e2); //添加元素属性和文本内容,属于方法链的编程风格 e2.addContent(new Element("aaa").setAttribute("a", "b") .setAttribute("x", "y").setAttribute("gg", "hh").setText("text content")); //设置其格式,一般还有一个没有缩进与空格的格式getRawFormat,主要用于XML的网络传输,因为它没有空格,减少网络传输的数据量。 Format format = Format.getPrettyFormat(); //设置元素前面空格 format.setIndent(" "); //设置编码方式 // format.setEncoding("gbk"); //将XML文档输出 XMLOutputter out = new XMLOutputter(format); out.output(document, new FileWriter("jdom.xml")); } } 2、Jdom解析XML import java.io.File; import java.io.FileOutputStream; import java.util.List; import org.jdom.Attribute; import org.jdom.Document; import org.jdom.Element; import org.jdom.input.SAXBuilder; import org.jdom.output.Format; import org.jdom.output.XMLOutputter; public class JDomTest2 { public static void main(String[] args) throws Exception { //JDOM从XML中解析 SAXBuilder builder = new SAXBuilder(); //获得XML文档对象 Document doc = builder.build(new File("jdom.xml")); //得到文档根元素 Element element = doc.getRootElement(); System.out.println(element.getName()); //得到根元素下的hello元素 Element hello = element.getChild("hello"); System.out.println(hello.getText()); //得到hello子元素下的属性 List list = hello.getAttributes(); //得到hello元素下属性的名字和值 for(int i = 0 ;i < list.size(); i++) { Attribute attr = (Attribute)list.get(i); String attrName = attr.getName(); String attrValue = attr.getValue(); System.out.println(attrName + "=" + attrValue); } //删除hello下的world子元素 hello.removeChild("world"); //将文档保存到另一个文件 XMLOutputter out = new XMLOutputter(Format.getPrettyFormat().setIndent(" ")); out.output(doc, new FileOutputStream("jdom2.xml")); } } 3、综合实例 import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.List; import org.jdom.Document; import org.jdom.Element; import org.jdom.JDOMException; import org.jdom.input.SAXBuilder; import org.jdom.output.Format; import org.jdom.output.XMLOutputter; public class XMLTest { public static void main(String[] args) { modifyXML(); } public static void createXML() { Element root = new Element("学生信息"); Element stu1 = new Element("学生"); Element stu2 = new Element("学生"); Element name1 = new Element("姓名"); Element sex1 = new Element("性别"); Element age1 = new Element("年龄"); Element name2 = new Element("姓名"); Element sex2 = new Element("性别"); Element age2 = new Element("年龄"); name1.setText("小明"); sex1.setText("男"); age1.setText("19"); name2.setText("小花"); sex2.setText("女"); age2.setText("20"); root.addContent(stu1); root.addContent(stu2); stu1.addContent(name1); stu1.addContent(sex1); stu1.addContent(age1); stu2.addContent(name2); stu2.addContent(sex2); stu2.addContent(age2); Document doc = new Document(root); Format f = Format.getPrettyFormat(); f.setEncoding("gb2312"); XMLOutputter out = new XMLOutputter(f); try { out.output(doc, new FileOutputStream(new File("c:/myxml.xml"))); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static void searchXML() { SAXBuilder build = new SAXBuilder(); try { Document doc = build.build("c:/myxml.xml"); Element e = doc.getRootElement(); List<Element> list = e.getChildren(); for (Element ele : list) { System.out.println(ele.getChild("姓名").getName() + ":" + ele.getChild("姓名").getText()); System.out.println(ele.getChild("性别").getName() + ":" + ele.getChild("性别").getText()); System.out.println(ele.getChild("年龄").getName() + ":" + ele.getChild("年龄").getText()); } } catch (JDOMException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static void addElement() { SAXBuilder build=new SAXBuilder(); try { Document doc=build.build("c:/myxml.xml"); Element root=doc.getRootElement(); Element stu=root.getChild("学生"); Element cla=new Element("班级"); cla.addContent("2班"); stu.addContent(cla); XMLOutputter out=new XMLOutputter(); out.output(doc,new FileOutputStream(new File("c:/myxml.xml"))); } catch (JDOMException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static void modifyXML() { SAXBuilder build=new SAXBuilder(); Document doc; try { doc = build.build("c:/myxml.xml"); Element root=doc.getRootElement(); Element stu=root.getChild("学生"); Element age=stu.getChild("年龄2"); age.setName("年龄"); age.setText("10"); List<Element> list=stu.getChildren(); for(Element e:list) { if(e.getName().equals("")); // { //// Element height=new Element("身高"); //// height.setText("175厘米"); //// root.addContent(height); // stu.removeChild(str); // } } XMLOutputter out=new XMLOutputter(); out.output(doc,new FileOutputStream(new File("c:/myxml.xml"))); } catch (JDOMException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }
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