xml解析集聚-优快云博客

本文链接：https://blog.youkuaiyun.com/xiaoliang330/article/details/83880999

本文介绍使用Java进行XML文件的解析与操作方法，包括创建、读取、修改XML文件的具体实现过程。通过JDOM与Dom4j两个库，演示了如何构建XML文档、解析XML内容、修改XML节点及保存修改后的文件。

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贴上几个xml解析的程序，以后好翻阅


package com.ibm.test;

import java.io.File;

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 JDomTest {
	public static void main(String[] args) {
		SAXBuilder saxBuilder = new SAXBuilder();
		try {
			Document doc = saxBuilder.build(new File("domdb.xml"));

			// 首先创建好节点
			Element eltDb = new Element("db");	
			Element eltDriver = new Element("driver");
			Element eltUrl = new Element("url");
			Element eltUser = new Element("user");
			Element eltPassword = new Element("password");

			// 设置节点的值
			eltDriver.setText("com.mysql.jdbc.Driver");
			eltUrl.setText("jdbc:mysql://localhost/mySql");
			eltUser.setText("root");
			eltPassword.setText("xlc");

			// 添加到根节点
			eltDb.addContent(eltDriver);
			eltDb.addContent(eltUrl);
			eltDb.addContent(eltUser);
			eltDb.addContent(eltPassword);
			// 根节点设置属性
			eltDb.setAttribute("type", "mysql");

			Element root = doc.getRootElement();//This will return the root element for this document
			// root.removeChild("db");//删除节点
			root.addContent(eltDb);// 增加节点

			// 修改db节点中内容
			root.getChild("db").getChild("user").setText("system");
			root.getChild("db").getChild("password").setText("manager");

			XMLOutputter xmlOut = new XMLOutputter();

			// 设置XML格式
			Format fmt = Format.getPrettyFormat();
			fmt.setIndent("    ");
			fmt.setEncoding("utf-8");

			xmlOut.setFormat(fmt);
			xmlOut.output(doc, System.out);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}


package com.ibm.test;

import java.io.FileWriter;
import java.io.IOException;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

/**
 * 写入文件或输出
 * 
 * @author xll
 * 
 */
public class Dom4jWrite {

	public static void main(String[] args) {
		Document doc = DocumentHelper.createDocument();

		doc.addProcessingInstruction("xml-stylesheet",
				"type='text/xsl' href='db.xsl'");
		doc.addDocType("dbconfig", null, "db.dtd");

		// Element root=DocumentHelper.createElement("dbconfig");
		// doc.setRootElement(root);
		Element root = doc.addElement("dbconfig");

		Element eltDb = root.addElement("db");
		Element eltDriver = eltDb.addElement("driver");
		Element eltUrl = eltDb.addElement("url");
		Element eltUser = eltDb.addElement("user");
		Element eltPassword = eltDb.addElement("password");

		eltDriver.setText("com.mysql.jdbc.Driver");
		eltUrl.setText("jdbc:mysql://localhost/mySql");
		eltUser.setText("root");
		eltPassword.setText("xlc");
		eltDb.addAttribute("type", "mysql");

		try {
			// 设置输出格式
			OutputFormat outFmt = new OutputFormat("    ", true);
			outFmt.setEncoding("UTF-8");

			/**//*
				 * PrintWriter pw = new PrintWriter(System.out); doc.write(pw);
				 * pw.flush(); pw.close();
				 */

			// XMLWriter xmlWriter = new XMLWriter(System.out, outFmt);
			XMLWriter xmlWriter = new XMLWriter(new FileWriter("db.xml"),
					outFmt);
			xmlWriter.write(doc);
			xmlWriter.flush();
			xmlWriter.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}


package com.ibm.test;

import java.io.File;
import java.io.FileWriter;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class Dom4jModify {
	public Document modifyDocument(File inputXml) {
		try {
			SAXReader saxReader = new SAXReader();
			Document document = saxReader.read(inputXml);
			document.addDocType("dbconfig", null, "db.dtd");
			List list = document.content();

			// Iterator iter = document.nodeIterator();
			Iterator iter = list.iterator();

			Element element = (Element) iter.next();
			element.element("db").attribute("type").setValue("mysql");
			element.element("db").element("url").setText(
					"jdbc:mysql://localhost/mySql");
			element.element("db").element("driver").setText(
					"com.mysql.jdbc.Driver");
			element.element("db").element("user").setText("root");
			element.element("db").element("password").setText("xlc");

			// 设置输出格式
			OutputFormat outFmt = new OutputFormat("    ", true);
			outFmt.setEncoding("UTF-8");

			XMLWriter xmlWriter = new XMLWriter(new FileWriter(
					"domdb-modified.xml"), outFmt);
			xmlWriter.write(document);
			xmlWriter.flush();
			xmlWriter.close();
			return document;
		} catch (Exception e) {
			System.out.println(e.getMessage());
			return null;
		}
	}

	public static void main(String[] args) throws Exception {
		Dom4jModify dom4jParser = new Dom4jModify();
		Document document = dom4jParser.modifyDocument(new File("domdb.xml"));

		OutputFormat outFmt = new OutputFormat("    ", true);
		outFmt.setEncoding("UTF-8");
		XMLWriter xmlWriter = new XMLWriter(System.out, outFmt);
		xmlWriter.write(document);
		xmlWriter.flush();
		xmlWriter.close();
	}
}


package com.ibm.xml;


import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;
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.XMLOutputter;
/**
 * Jdom解析
 * @author xll
 *
 */
public class JdomXmlDocument implements XmlDocument{

	public void createXml(String fileName) {
		Document document;   
		Element  root;   
		root=new Element("employees");   
		document=new Document(root);   
		Element employee=new Element("employee");   
		root.addContent(employee);   
		Element name=new Element("name");   
		name.setText("ddvip");   
		employee.addContent(name);   
		Element sex=new Element("sex");   
		sex.setText("m");   
		employee.addContent(sex);   
		Element age=new Element("age");   
		age.setText("23");   
		employee.addContent(age);   
		XMLOutputter XMLOut = new XMLOutputter();   
		try {   
			XMLOut.output(document, new FileOutputStream(fileName));   
		} catch (FileNotFoundException e) {   
			e.printStackTrace();   
		} catch (IOException e) {   
			e.printStackTrace();   
		}   
	}

	@SuppressWarnings("unchecked")
	public void parserXml(String fileName) {
		SAXBuilder builder=new SAXBuilder(false);    
		try {   
			Document document=builder.build(fileName);   
			Element employees=document.getRootElement();    
			List employeeList=employees.getChildren("employee");  
			//System.out.println("employeeList.size()" + employeeList.size());
			for(Iterator iter = employeeList.iterator();iter.hasNext();){
				Element employee=(Element)iter.next(); 
				List employeeInfo=employee.getChildren();  
				//System.out.println(employeeInfo.size());
				for(int i = 0;i < employeeInfo.size();i++){
					System.out.println(((Element)employeeInfo.get(i)).getName()+":"+((Element)employeeInfo.get(i)).getValue());   
				}
			}
		} catch (JDOMException e) {
			e.printStackTrace();   
		} catch (IOException e) { 
			e.printStackTrace();   
		} 
	}
}


package com.ibm.xml;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

/**
 * Dom4j
 * 
 * @author Administrator
 * 
 */
public class Dom4jXmlDocument implements XmlDocument {

	public void createXml(String fileName) {
		Document document = DocumentHelper.createDocument();
		Element employees = document.addElement("employees");
		Element employee = employees.addElement("employee");
		Element name = employee.addElement("name");
		name.setText("ddvip");
		Element sex = employee.addElement("sex");
		sex.setText("m");
		Element age = employee.addElement("age");
		age.setText("29");
		try {
			Writer fileWriter = new FileWriter(fileName);
			XMLWriter xmlWriter = new XMLWriter(fileWriter);
			xmlWriter.write(document);
			xmlWriter.close();
		} catch (IOException e) {
			System.out.println(e.getMessage());
		}
	}

	public void parserXml(String fileName) {
		File inputXml = new File(fileName);
		SAXReader saxReader = new SAXReader();
		try {
			Document document = saxReader.read(inputXml);
			Element employees = document.getRootElement();
			for (Iterator i = employees.elementIterator(); i.hasNext();) {
				Element employee = (Element) i.next();
				for (Iterator j = employee.elementIterator(); j.hasNext();) {
					Element node = (Element) j.next();
					System.out.println(node.getName() + ":" + node.getText());
				}
			}
		} catch (DocumentException e) {
			System.out.println(e.getMessage());
		}
	}
}