在eclipse完成对Java_web项目里面资源文件的读取

url=127.0.0.1
name=root
password=root

package test;

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

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class ServletContextDemo2
 */
@WebServlet("/ServletContextDemo2")    //注意有了这个就不需要往web.xml文件里面添加路径映射
public class ServletContextDemo2 extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        //路径上第一个斜杠/相对于项目day02的相对路径
        InputStream in = this.getServletContext().getResourceAsStream("/build/classes/db.properties");
        //FileInputStream in = new FileInputStream("classes/db.properties");
        Properties pro = new Properties();
        pro.load(in);  //这个文件的值会以map的形式存放
        
        String url = pro.getProperty("url");
        String name = pro.getProperty("name");
        String password = pro.getProperty("password");
        
        System.out.println(url);
        System.out.println(name);
        System.out.println(password);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

InputStream in = this.getServletContext().getResourceAsStream("/build/classes/db.properties");