Servlet相关配置

配置方式

webXML

定义标签
<url-pattern>
Servlet访问路径

<!--配置Servlet-->

<servlet>

    <!--起个短名-->

    <servlet-name>demo1</servlet-name>

    <!--全类名-->

    <servlet-class>cn.itcast.web.servlet.ServletDemo1</servlet-class>

</servlet>

<!--映射-->

<servlet-mapping>

    <!--映射名称对应类短名-->

    <servlet-name>demo1</servlet-name>

    <!--资源路径-->

    <url-pattern>/demo1</url-pattern>

</servlet-mapping>

注解

定义的<urlpartten>数组：可以为一个servlet定义多个访问路径。

 package cn.itcast.web.servlet;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import java.io.IOException;

 /**

  * @author 旗木五五开

  * @create 2020-02-19 0:08

  */

 @WebServlet({"/d4","/dd4","/ddd4"})

 //{}多个，数组用大括号

 public class ServletDemo4 extends HttpServlet {

     @Override

     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         System.out.println("doGet");

     }

 }

路径定义规则

/xxx
/xxx/xxx：多层路径。目录结构
/*.do

多层路径。目录结构

 package cn.itcast.web.servlet;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import java.io.IOException;

 /**

  * @author 旗木五五开

  * @create 2020-02-19 0:08

  */

 @WebServlet("/user/demo4")

 public class ServletDemo4 extends HttpServlet {

     @Override

     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         System.out.println("doGet");

     }

 }

*代表任意，想写啥就写啥，写啥都能访问到。直接写/*。后面写什么都能访问到

优先级最低，别的都访问不到，才访问

 package cn.itcast.web.servlet;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import java.io.IOException;

 /**

  * @author 旗木五五开

  * @create 2020-02-19 0:08

  */

 @WebServlet("/user/*")

 public class ServletDemo4 extends HttpServlet {

     @Override

     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         System.out.println("doGet");

     }

 }

*.do：*所有，do后缀名。注意不要写错，*.啥都行

注意*前不要加/

加了就——报错

 package cn.itcast.web.servlet;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import java.io.IOException;

 /**

  * @author 旗木五五开

  * @create 2020-02-19 0:08

  */

 @WebServlet("*.do")

 public class ServletDemo4 extends HttpServlet {

     @Override

     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         System.out.println("doGet");

     }

 }

巴特西

Servlet相关配置

最新文章

热门文章