Servlet学习笔记3之通过继承HttpServlet开发Servlet

通过继承HttpServlet开发Servlet，需要重写doGet()和doPost()方法：

//这是第三种开发Servlet的方法，通过继承HttpServletpackage com.chan;import javax.servlet.http.*;import java.io.*;public class HelloHttp extends HttpServlet {//处理get请求//request用于获得客户端信息，response用于向客户端返回信息（客户端相当于浏览器）public void doGet(HttpServletRequest request,HttpServletResponse response) {try {PrintWriter pw = response.getWriter();pw.println("hello,http!");} catch(Exception e) {e.printStackTrace();}}//处理post请求//request用于获得客户端信息，response用于向客户端返回信息（客户端相当于浏览器）public void doPost(HttpServletRequest request,HttpServletResponse response) {this.doGet(request,response);}}

配置web.xml：

<servlet>
     <servlet-name>HelloHttp</servlet-name>
<servlet-class>com.chan.HelloHttp</servlet-class>
  </servlet>
  <servlet-mapping>
     <servlet-name>HelloHttp</servlet-name>
<url-pattern>/hellohttp</url-pattern>
  </servlet-mapping>