Dom4j
package com.jadyer.demo.xml;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import java.io.IOException;
/**
* Dom4j读取XML
*
*/
public class Dom4jDemo {
public static void main(String[] args) throws IOException, DocumentException {
xmlRead();
xmlWrite();
}
private static void xmlRead() throws DocumentException {
////读取XML文件获取Document对象
//Document document = new SAXReader().read(new File("D:/testXML.xml"));
////读取XML文本内容获取Document对象
Document document = DocumentHelper.parseText("<?xml version=\"1.0\" encoding=\"UTF-8\"?><users><user><id>123</id><name> Jadyer</name></user></users>");
System.out.println(((Element)document.selectObject("/users/user/id")).getText());
System.out.println(((Element)document.selectObject("/users/user/name")).getTextTrim());
}
private static void xmlWrite() throws IOException {
//Document对象代表整个xml文档
Document document = DocumentHelper.createDocument();
//rootElement代表文档根元素
Element rootElement = document.addElement("users");
//增加一个注释
rootElement.addComment("This is a comment!");
//增加一个<user>标签
Element userElement11 = rootElement.addElement("user");
//设定不同的<user>下面的子标签
Element idElement11 = userElement11.addElement("id");
Element nameElement11 = userElement11.addElement("name");
Element ageElement11 = userElement11.addElement("age");
Element addressElement11 = userElement11.addElement("address");
//为各个子标签赋值
idElement11.setText("1");
nameElement11.setText("Jadyer");
ageElement11.setText("24");
addressElement11.setText("BeiJing");
//再加一个子标签<user>
Element userElement22 = rootElement.addElement("user");
Element idElement22 = userElement22.addElement("id");
Element nameElement22 = userElement22.addElement("name");
Element ageElement22 = userElement22.addElement("age");
Element addressElement22 = userElement22.addElement("address");
idElement22.setText("2");
nameElement22.setText("Moon");
ageElement22.setText("23");
addressElement22.setText("HaerBin");
//设定输出自动缩进及编码
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("UTF-8");
////输出到文件
//XMLWriter writer = new XMLWriter(new FileWriter("D:/testXML.xml"), format);
//输出到控制台
XMLWriter writer = new XMLWriter(format);
writer.write(document);
writer.flush();
writer.close();
}
}生成的XML，控制台输出如下
<?xml version="1.0" encoding="UTF-8"?>
<users>
<!--This is a comment!-->
<user>
<id>1</id>
<name>Jadyer</name>
<age>24</age>
<address>BeiJing</address>
</user>
<user>
<id>2</id>
<name>Moon</name>
<age>23</age>
<address>HaerBin</address>
</user>
</users>Jdom
package com.jadyer.demo.xml;
import org.apache.commons.io.IOUtils;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.filter.Filters;
import org.jdom2.input.SAXBuilder;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
import org.jdom2.xpath.XPath;
import org.jdom2.xpath.XPathBuilder;
import org.jdom2.xpath.XPathExpression;
import org.jdom2.xpath.jaxen.JaxenXPathFactory;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.List;
/**
* Jdom读写XML
*
*/
public class JdomDemo {
public static void main(String[] args) throws IOException, JDOMException {
xmlRead();
xmlWrite();
}
private static void xmlRead() throws JDOMException, IOException {
//读取XML文件获取Document对象
//Document document = new SAXBuilder().build(new File("D:/testXML.xml"));
//Document document = new SAXBuilder().build(JdomDemo.class.getResourceAsStream("config.xml"));
//Document document = new SAXBuilder().build(Thread.currentThread().getContextClassLoader().getResourceAsStream("config.xml"));
//读取XML文本内容获取Document对象
Document document = new SAXBuilder().build(IOUtils.toInputStream("<?xml version=\"1.0\" encoding=\"UTF-8\"?><users><user><id>123</id><name> Jadyer</name></user></users>", StandardCharsets.UTF_8));
Element rootElement = document.getRootElement();
System.out.println(((Element)XPath.selectSingleNode(rootElement, "//users/user/id")).getText());
System.out.println(((Element)XPath.selectSingleNode(rootElement, "//users/user/name")).getTextTrim());
/**
*
* Jdom2开始就不推荐使用XPath了，改用XPathFactory/XPathExpression/XPathBuilder替代
*/
XPathBuilder<Element> builder = new XPathBuilder<>("//users/user/id", Filters.element());
XPathExpression<Element> expression = builder.compileWith(JaxenXPathFactory.instance());
List<Element> elementList = expression.diagnose(rootElement, false).getResult();
System.out.println(elementList.get(0).getTextTrim());
builder = new XPathBuilder<>("//users/user/name", Filters.element());
expression = builder.compileWith(JaxenXPathFactory.instance());
elementList = expression.diagnose(rootElement, false).getResult();
System.out.println(elementList.get(0).getTextTrim());
}
private static void xmlWrite()throws IOException {
//先New一个根（Jdom中每一个节点都是Element）
Element rootElt = new Element("selects");
//第一个子标签
Element selectElt11 = new Element("select");
Element idElt11 = new Element("id");
Element valueElt11 = new Element("name");
idElt11.addContent("1");
valueElt11.addContent("哈尔滨");
selectElt11.addContent(idElt11);
selectElt11.addContent(valueElt11);
//第一个子标签
Element selectElt22 = new Element("select");
Element idElt22 = new Element("id");
Element valueElt22 = new Element("name");
idElt22.addContent("2");
valueElt22.addContent("重庆");
selectElt22.addContent(idElt22);
selectElt22.addContent(valueElt22);
//添加子标签
rootElt.addContent(selectElt11);
rootElt.addContent(selectElt22);
//通过根得到整个XML对象
Document doc = new Document(rootElt);
//设定输出的XML文件编码，默认生成的XML文件为UTF-8编码
XMLOutputter out = new XMLOutputter();
out.setFormat(Format.getCompactFormat().setEncoding("UTF-8"));
//控制台打印XML
System.out.println(out.outputString(doc));
//将生成的XML文件写到D:/testXML.xml中
out.output(doc, new FileOutputStream("D:/testXML.xml"));
}
}生成的XML，控制台输出如下
<?xml version="1.0" encoding="UTF-8"?>
<selects><select><id>1</id><name>哈尔滨</name></select><select><id>2</id><name>重庆</name></select></selects>来源：CSDN
作者：爱猫狗的小郝
链接：https://blog.csdn.net/qq_43518645/article/details/104041053