1、Servlet映射可以多层多样
例子:
<servlet>
<servlet-name>HServlet</servlet-name>
<servlet-class>com.hunhun.HServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HServlet</servlet-name>
<url-pattern>/HServlet</url-pattern>
<!-- <url-pattern>/abc.html</url-pattern> -->
<!-- <url-pattern>/HServlet/abc</url-pattern> -->
</servlet-mapping>
2、Servlet可以被映射到多个URL上
<servlet>
<servlet-name>FirstServlet</servlet-name>
<servlet-class>com.hunhun.FirstServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FirstServlet</servlet-name>
<url-pattern>/FirstServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>FirstServlet</servlet-name>
<url-pattern>/GServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>FirstServlet</servlet-name>
<url-pattern>/HServlet</url-pattern>
</servlet-mapping>
可通过浏览器url:http://localhost:8080/myweb/FirstServlet|GServlet|HServlet访问FirstServlet3、Servlet可使用通配符进行映射(只可以有两种格式)
(1)使用 *.扩展名
<servlet>
<servlet-name>FirstServlet</servlet-name>
<servlet-class>com.hunhun.FirstServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FirstServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
可通过浏览器url:http://localhost:8080/myweb/abc.do访问FirstServlet
(2)使用 / 开始 /* 结束
<servlet>
<servlet-name>FirstServlet</servlet-name>
<servlet-class>com.hunhun.FirstServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FirstServlet</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
多个映射通配原则
(1)相似度高的优先匹配
(2)*.扩展名的匹配方式优先级最低