用ServletContext获取properties配置文件中的一些数据

package donghongyujava.test_jdbc;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Test_jdbc extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		// 获取ServletContest对象
		ServletContext sct = this.getServletConfig().getServletContext();
		// 获取需要解析的文件所在服务器的绝对路径
		String realPath = sct.getRealPath("/WEB-INF/classes/jdbc.properties");
		System.out.println(realPath);
		// 根据绝对路径创建File的对象那个
		File jdbc = new File(realPath);
		// 打印流对象
		displayProps(new FileInputStream(jdbc));
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doGet(request, response);
	}

	public void displayProps(InputStream inStream) throws IOException {
		// 创建properties操作对象
		Properties prop = new Properties();
		// 把流对象载入
		prop.load(inStream);
		// 获取所有的键名称
		Enumeration<?> enums = prop.propertyNames();
		// 遍历结果集
		while (enums.hasMoreElements()) {
			//获取集合的每个元素,即获取键名称
			String key = (String) enums.nextElement();
			//根据键获取所对应的值
			String value = prop.getProperty(key);
			//输出
			System.out.println(key + "==" + value);

		}

	}

}

jdbc.properties文件内容

url=jdbc\:mysql\://localhost\:3306/java_web
user=admin
pass=root

效果图