java——servletContext读取资源文件

java代码：

package com.itheima.servlet;

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

@SuppressWarnings("serial")
public class Demo extends HttpServlet{
	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		//获取servletContext对象
		ServletContext context = getServletContext();
		
		//获取给定的文件在服务器上面的绝对路径
		String path = context.getRealPath("file/config.properties");
		System.out.println(path);
		
		//1.创建属性对象
		Properties properties = new Properties();
		InputStream is = new FileInputStream(path);
		properties.load(is);
		
		String name = properties.getProperty("name");
		System.out.println("name="+name);
	}
	
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doGet(req, resp);
	}
}

xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>ServletRegister</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  
  <servlet>
  	<display-name>Demo</display-name>
  	<servlet-name>Demo</servlet-name>
  	<servlet-class>com.itheima.servlet.Demo</servlet-class>
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>Demo</servlet-name>
  	<url-pattern>/Demo</url-pattern>
  </servlet-mapping>
  
</web-app>

config.properties文件内容，该文件放置于WebContent新建的file目录下，目录名可随便取

name = zhangsan

在浏览器或者控制台可以看到输出结果为：name = zhangsan

正在尝试写博客，把会的分享给你们，如有写的不好的地方，希望指点一下，喜欢的朋友们请点个赞，谢谢！