这里描述的只是 servlet 配置
<servlet-mapping>
<servlet-name>helloworld</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
加上
<servlet-mapping>
<servlet-name>welcome</servlet-name>
<url-pattern>/en/welcome</url-pattern>
<url-pattern>/zh/welcome</url-pattern>
</servlet-mapping>
