Servlet 3.0 @ WebFilter how to control the execution sequence of multiple filters, @ webfilterfilter

Servlet 3.0 @ WebFilter how to control the execution sequence of multiple filters, @ webfilterfilter

Previously, we controlled the execution sequence of multiple filters through web. in xml, the filter position is controlled. If the filter is placed above, it is executed first. The following "User Login check filter" is executed first than "interface LOG filter ".

<! -- User Logon detection filter -->
<Filter> <filter-name> UserLoginFilter </filter-name>
<Filter-class> net. tfgzs. demo. filter. UserLoginFilter </filter-class>
</Filter>
<Filter-mapping>
<Filter-name> UserLoginFilter </filter-name>
<Url-pattern>/* </url-pattern>
</Filter-mapping>
<! -- Interface LOG filter --> <filter-name> ApiLog </filter-name> <filter-class> net. tfgzs. demo. filter. apiLog </filter-class> </filter> <filter-mapping> <filter-name> ApiLog </filter-name> <url-pattern>/* </url-pattern> </filter-mapping>

However, when we use the @ WebFilter annotation, we find that the annotation does not provide parameters that can control the execution sequence.

@ WebFilter attributes

Attribute name	Type	Description
FilterName	String	Specify the name attribute of the filter, which is equivalent to <filter-name>
Value	String []	This attribute is equivalent to the urlPatterns attribute. However, they should not be used at the same time.
UrlPatterns	String []	Specifies the URL matching mode for a set of filters. It is equivalent to the <url-pattern> label.
ServletNames	String []	Specify the Servlet to which the filter applies. The value is the value of the name attribute in @ WebServlet, or the value of <servlet-name> in web. xml.
DispatcherTypes	DispatcherType	Specify the forwarding mode of the filter. Specific values include async, ERROR, FORWARD, INCLUDE, and REQUEST.
InitParams	WebInitParam []	Specify a set of filter initialization parameters, which is equivalent to the <init-param> label.
AsyncSupported	Boolean	Whether the declared filter supports asynchronous operation mode is equivalent to the <async-supported> label.
Description	String	The description of the filter, which is equivalent to the <description> tag.
DisplayName	String	The display name of the filter, usually used with tools, is equivalent to the <display-name> label.

 

It is found through practice that if you want to control the execution sequence of filer, you canControl the file name of the filterTo control

For example:

The UserLoginFilter. java and ApiLog. java files contain "User Login check filter" and "interface LOG filter", becauseBefore the first letter of A row of UIn this case, the "interface LOG filter" is first executed and then the "user login check filter" is executed. Therefore, we need to change the names of the two files

Filter0_UserLogin.java

Filterpolicapilog.java

In this way, you can first execute "User Login check filter" and then "interface LOG filter"

 

This article from the "take off Studio" blog, please be sure to keep this source http://www.cnblogs.com/tfgzs/p/4571137.html