servlet 的 url-pattern 的写法

1. 精确匹配

<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/test.html</url-pattern>
    <url-pattern>/a/test.html</url-pattern>
</servlet-mapping>

2. 扩展名匹配

<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>*.do</url-pattern>
    <url-pattern>*.action</url-pattern>
</servlet-mapping>

3. 路径匹配

<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/test/*</url-pattern>
</servlet-mapping>

4. 匹配任意的 url

<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

5. 优先顺序

精确路径 > 最长路径 > 扩展名