JavaWeb之Servlet

Posted 2021-03-11

含义

Servlet是一种Web动态开发技术，也是JavaEE的组件之一。

作用

处理请求和响应数据

开发步骤

1. extends HttpServlet类
2. 重写doGet()或doPost()方法

3. web.xml配置

   DateServlet.class
   public class DateServlet extends HttpServlet {
   @Override
   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
   
       SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
       Date date = new Date();
       String data = sdf.format(date);
       resp.getOutputStream().write(data.getBytes());
   }
   }
   web.xml
   <servlet>
   //定义servlet的名字
   <servlet-name>dateServlet</servlet-name>
   //Tomcat会根据该值反射创建servlet对象 
   <servlet-class>com.neu.day01.DateServlet</servlet-class>
   </servlet>
   //配置当前servlet能处理怎样的url请求
   <servlet-mapping>
   <servlet-name>dateServlet</servlet-name>
   <url-pattern>/dateServlet</url-pattern>
   </servlet-mapping>

   测试