读取XML配置文件的工具类-CSDN博客

本文链接：https://blog.csdn.net/iteye_19838/article/details/82580859

本文详细介绍了如何使用DOM4J和Jaxen库解析XML配置文件，从中提取关键信息，并利用这些信息创建数据库连接池。通过实例演示了从XML中获取数据库驱动、URL、用户名、密码及连接池大小的过程。

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1. 添加maven

<dependency>
	<groupId>dom4j</groupId>
	<artifactId>dom4j</artifactId>
	<version>1.6.1</version>
</dependency>
<dependency><!-- Jaxen is a universal Java XPath engine. -->
	<groupId>jaxen</groupId>
	<artifactId>jaxen</artifactId>
	<version>1.1.6</version>
</dependency>

2 XMLConfig.java


package com.utils;

import java.net.URL;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;

public class XMLConfig {
	private Document doc;

	public XMLConfig(String path){
			try {
				URL url = this.getClass().getClassLoader().getResource(path);
				SAXReader reader = new SAXReader();
				doc = reader.read(url);
			} catch (Exception e) {
				e.printStackTrace();
			}
	}

	public Document getDocument(){
		return doc;
	}

	public String getString(String path) throws Exception{
		Node node =doc.selectSingleNode(path);
		if(node!=null)
			return doc.selectSingleNode(path).getText();
		else
			throw new Exception(path + " not exists. ");
	}

	public int getInt(String path) throws Exception{
		Node node =doc.selectSingleNode(path);
		if(node!=null)
			return Integer.parseInt(doc.selectSingleNode(path).getText());
		else
			throw new Exception(path + " not exists. ");
	}

	@SuppressWarnings("unchecked")
	public List<Node> selectNodes(String path){
		return (List<Node>)doc.selectNodes(path);
	}




}

3. 使用


		try {
			XMLConfig config = new XMLConfig(path);
			String drive =config.getString("/configuration/environments/environment/dataSource/property[@name='driver']/@value") ;
			String url =config.getString("/configuration/environments/environment/dataSource/property[@name='url']/@value");
			String username =config.getString("/configuration/environments/environment/dataSource/property[@name='username']/@value");
			String password =config.getString("/configuration/environments/environment/dataSource/property[@name='password']/@value");
			int poolsize =config.getInt("/configuration/environments/environment/dataSource/property[@name='poolsize']/@value");
			pool = new JDBCPool(url, drive, username, password, poolsize);
		} catch (Exception e) {
			e.printStackTrace();
		}