1 package cn.itcast; 2  3 import java.io.FileInputStream; 4 import java.io.IOException; 5 import java.io.InputStream; 6 import java.io.PrintWriter; 7 import java.util.Properties; 8  9 import javax.servlet.ServletContext;10 import javax.servlet.ServletException;11 import javax.servlet.http.HttpServlet;12 import javax.servlet.http.HttpServletRequest;13 import javax.servlet.http.HttpServletResponse;14 15 //读取资源文件16 public class ServletDemo1 extends HttpServlet {17 18     19     public void doGet(HttpServletRequest request, HttpServletResponse response)20             throws ServletException, IOException {21 22         test2();23     }24     25     //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26     public void test2() throws IOException {27         28         String path = this.getServletContext().getRealPath("/WEB-INF/classes/cn/itcast/db.properties");29         System.out.println(path);30         String filename = path.substring(path.lastIndexOf("\\")+1);31         System.out.println("当前读取到资源名称是："+filename);32         33         FileInputStream in = new FileInputStream(path);34         35         Properties props = new Properties();36         props.load(in);37         38         String url = props.getProperty("url");39         String username = props.getProperty("username");40         String password = props.getProperty("password");41         42         System.out.println(url+username+password);43     }44 45 46     public void test1() throws IOException {47         InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/classes/cn/itcast/db.properties");48     49         Properties props = new Properties();50         props.load(in);51         52         String url = props.getProperty("url");53         String username = props.getProperty("username");54         String password = props.getProperty("password");55         56         System.out.println(url+username+password);57     }58 59     60     public void doPost(HttpServletRequest request, HttpServletResponse response)61             throws ServletException, IOException {62 63         64     }65 66 }

1 url=jdbc:mysql://localhost:3306/test2 username=root3 password=root