Servlet

Servlet - 图1

配置文件 web.xml

  1. <servlet>
  2.     <servlet-name>HelloServlet</servlet-name>
  3.     <servlet-class>com.zmy.HelloServlet</servlet-class>
  4. </servlet>
  6. <servlet-mapping>
  7.     <servlet-name>HelloServlet</servlet-name>
  8.     <url-pattern>/helloServlet</url-pattern>
  9. </servlet-mapping>
  11. <!--<session-config>
  12.         <session-timeout
  13.     </session-config>-->
  15.     <!--<welcome-file-list>
  16.         <welcome-file>index.jsp</welcome-file>
  17.     </welcome-file-list>-->

注解 Servlet.java

  1. @WebServlet(name = "HelloServlet",urlPatterns = "/hello")
  3. public class HelloServlet extends HttpServlet {
  4.     @Override
  5.     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  6.         //1.获取前端参数
  7.         String method = req.getParameter("method");
  8.         if (method.equals("add")){
  9.             req.getSession().setAttribute("msg","执行了add方法");
  10.         }
  11.         if (method.equals("delete")){
  12.             req.getSession().setAttribute("msg","执行了delete方法");
  13.         }
  14.         //2.调用业务层
  15.         //3.视图转发或者重定向
  16.         req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,resp);
  17.     }
  18.     @Override
  19.     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  20.         super.doPost(req, resp);
  21.     }
  22. }

test.jsp

  1. <html>
  2. <head>
  3.     <title>Title</title>
  4. </head>
  5. <body>
  7. ${msg}
  9. </body>
  10. </html>