认识达内从这里开始

初识Servlet

1.创建DispatcherServlet

1 package myservlet;

2

3 import java.io.IOException;

4 import javax.servlet.ServletException;

5 import javax.servlet.annotation.WebServlet;

6 import javax.servlet.http.HttpServlet;

7 import javax.servlet.http.HttpServletRequest;

8 import javax.servlet.http.HttpServletResponse;

9

10 /**

11 * Servlet implementation class Dispatcher

12 */

13 @WebServlet("/Dispatcher")

14 public class Dispatcher extends HttpServlet {

15    private static final long serialVersionUID = 1L;

16       

17    /**

18     * @see HttpServlet#HttpServlet()

19     */

20    public Dispatcher() {

21        super();

22        // TODO Auto-generated constructor stub

23    }

24

25    /**

26     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

27     */

28    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

29        // TODO Auto-generated method stub

30        response.getWriter().append("Served at: ").append(request.getContextPath());

31    }

32

33    /**

34     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

35     */

36    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

37        // TODO Auto-generated method stub

38        doGet(request, response);

39    }

40

41 }

2.将创建好的Servlet配置到web.xml

1 <servlet>

2      <servlet-name>dispatcher</servlet-name>

3      <servlet-class>myservlet.DispatcherServlet</servlet-class>

4  </servlet>

5  

6  <servlet-mapping>

7      <servlet-name>dispatcher</servlet-name>

8      <url-pattern>/</url-pattern>

9  </servlet-mapping>

3.将项目部署到tomcat下即可。

昆明IT培训的老师总结说明：

1.创建Servlet需继承Tomcat下servlet-api.jar下的类库

2.web.xml是项目的配置文件，需要将Servlet配置到该配置文件下

3.Servlet是项目入口