问题:
A . The init method on a filter is called the first time a servlet mapped to that filter is invoked.
B . A filter defined for a servlet must always forward control to the next resource in the filter chain.
C . Filters associated with a named servlet are applied in the order they appear in the web application deployment descriptor file.
D . If the init method on a filter throws an UnavailableException, then the container will make no further attempt to execute it.
● 参考解析
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