ServletContext读取Web应用中的资源文件

package cn.itcast;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
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;

//读取资源文件
public class ServletDemo1 extends HttpServlet {

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

        test2();
    }
    
    //通过servletContext的getReadlPath得到资源的绝对路径后，再通过传统流读取资源文件
    public void test2() throws IOException {
        
        String path = this.getServletContext().getRealPath("/WEB-INF/classes/cn/itcast/db.properties");
        System.out.println(path);
        String filename = path.substring(path.lastIndexOf("\\")+1);
        System.out.println("当前读取到资源名称是："+filename);
        
        FileInputStream in = new FileInputStream(path);
        
        Properties props = new Properties();
        props.load(in);
        
        String url = props.getProperty("url");
        String username = props.getProperty("username");
        String password = props.getProperty("password");
        
        System.out.println(url+username+password);
    }


    public void test1() throws IOException {
        InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/classes/cn/itcast/db.properties");
    
        Properties props = new Properties();
        props.load(in);
        
        String url = props.getProperty("url");
        String username = props.getProperty("username");
        String password = props.getProperty("password");
        
        System.out.println(url+username+password);
    }

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

        
    }

}

url=jdbc:mysql://localhost:3306/test
username=root
password=root