web.xml檔案中配置(servlet, spring, filter, listenr)的載入順序 研究
阿新 • • 發佈:2019-01-30
發現引起bug的原因是web.xml的下面幾行:
<filter-mapping>
<filter-name>SecurityFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CharacterEncoding</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CharacterEncoding</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
根據servlet2.3規範filter執行是按照web.xml配置的filter-mapping先後順序進行執行,所以上面的配置會導致遇見*.do的url請求,先進行SecurityFilter的過濾器處理,這時候沒有做編碼處理,已經是亂碼,到下面的filter處理時已經時亂碼,再做編碼處理已經沒有用處。
修正方式,調整filter-mapping順序,如下:
<filter-mapping>
<filter-name>CharacterEncoding</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CharacterEncoding</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>SecurityFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>SecurityFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CharacterEncoding</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CharacterEncoding</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
根據servlet2.3規範filter執行是按照web.xml配置的filter-mapping先後順序進行執行,所以上面的配置會導致遇見*.do的url請求,先進行SecurityFilter的過濾器處理,這時候沒有做編碼處理,已經是亂碼,到下面的filter處理時已經時亂碼,再做編碼處理已經沒有用處。
修正方式,調整filter-mapping順序,如下:
<filter-mapping>
<filter-name>CharacterEncoding</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CharacterEncoding</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>SecurityFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>