Serverlet读取文件

1.在resources文件夹下新建一个db.properties文件，写入；

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1 2	username=root password=123456

　　

 

2.java文件夹下建一个文件Demo05

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package com.yin;   import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.InputStream; import java.util.Properties;   public class Demo05 extends HttpServlet {     @Override     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {           InputStream is=this.getServletContext().getResourceAsStream("/WEB-INF/classes/db.properties");         Properties prop = new Properties();         prop.load(is);         String user = prop.getProperty("username");         String pwd = prop.getProperty("password");         resp.getWriter().print(user + ":" + pwd);     }       @Override     protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {         super.doGet(req, resp);     } }

　　3.web.xml配置访问路径

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<servlet>     <servlet-name>sd5</servlet-name>     <servlet-class>com.yin.Demo05</servlet-class> </servlet> <servlet-mapping>     <servlet-name>sd5</servlet-name>     <url-pattern>/sd5</url-pattern> </servlet-mapping>

　　4.运行TOMCAT,跳出页面后，地址加上/sd5,如下图；