擷取servletContext對象的方式

擷取servletContext對象的方式：

1.代碼如下：

packageeduask;

importjava.io.IOException;

importjava.io.InputStream;

importjava.util.Properties;

importjavax.servlet.ServletContext;

importjavax.servlet.ServletException;

importjavax.servlet.annotation.WebServlet;

importjavax.servlet.http.HttpServlet;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

@WebServlet("/Demo7")

publicclassTestServletContextextendsHttpServlet {

@Override

protectedvoidservice(HttpServletRequest req, HttpServletResponse res)

throwsServletException, IOException {

//擷取servletcontext對象 方式一

// ServletContext context=this.getServletConfig().getServletContext();

//方式二

ServletContextcontext=this.getServletContext();

String str=this.getServletContext().getInitParameter("company");

System.out.println(str);

}

}

2.web.xml的配置檔案，配置結果如下：

<servlet>

<servlet-name>myServletContext</servlet-name>

<servlet-class>eduask.TestServletContext</servlet-class>

</servlet>

<context-param>

<param-name>company</param-name>

<param-value>衆彙雲聚科技有限公司</param-value>

</context-param>

<servlet-mapping>

<servlet-name>myServletContext</servlet-name>

<url-pattern>/servletContext</url-pattern>

</servlet-mapping>

3.啟動tomcat，在浏覽器中輸入：

http://localhost:8080/webDemo/servletContext

4.在控制台中會顯示：衆彙雲聚科技有限公司