获取servletContext对象的方式：

1.代码如下：

package eduask;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Properties;
 import javax.servlet.ServletContext;
 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 Demo7
 */
 @WebServlet("/Demo7")
 public class TestServletContext extends HttpServlet {
 @Override
 protected void service(HttpServletRequest req, HttpServletResponse res)
 throws ServletException, IOException {
 //获取servletcontext对象 方式一
 // ServletContext context=this.getServletConfig().getServletContext();
 //方式二
 ServletContext  context=this.getServletContext();
 String str=this.getServletContext().getInitParameter("company");
 System.out.println(str);
 }
 }

2.web.xml的配置文件，配置结果如下：

<servlet>
 <servlet-name>myServletContext</servlet-name>
 <servlet-class>eduask.TestServletContext</servlet-class>
 </servlet>
 <context-param>
 <param-name>company</param-name>
 <param-value>众汇云聚科技有限公司</param-value>
 </context-param>
 <servlet-mapping>
 <servlet-name>myServletContext</servlet-name>
 <url-pattern>/servletContext</url-pattern>
 </servlet-mapping>

3.启动tomcat，在浏览器中输入：

​​ http://localhost:8080/webDemo/servletContext​​

4.在控制台中会显示：众汇云聚科技有限公司