Spring Delegatingfilterproxy Parsing

Previously Delegatingfilterproxy was configured in XML when it was necessary to use spring security, as follows:

<Filter>  <Filter-name>Springsecurityfilterchain</Filter-name>  <Filter-class>Org.springframework.web.filter.DelegatingFilterProxy</Filter-class> </Filter><filter-mapping>  <Filter-name>Springsecurityfilterchain</Filter-name>  <Url-pattern>/*</Url-pattern></filter-mapping>

So I always thought that this class is the class in spring security, and later found that this is not the case, this class is located in the Spring-web package, and security does not matter.

This class is actually a proxy class for the filter's delegate.

This configuration means that a spring-managed bean has a name called Springsecurityfilterchain and registers it in.

This is used in the Abstractsecuritywebapplicationinitializer of security:

/*** Registers the Springsecurityfilterchain *@paramServletContext the {@linkServletContext}*/    Private voidInsertspringsecurityfilterchain (ServletContext servletcontext) {String filtername=Default_filter_name; Delegatingfilterproxy Springsecurityfilterchain=NewDelegatingfilterproxy (filtername); String ContextAttribute=Getwebapplicationcontextattribute (); if(ContextAttribute! =NULL) {Springsecurityfilterchain.setcontextattribute (ContextAttribute); } registerfilter (ServletContext,true, FilterName, Springsecurityfilterchain); }

This is to configure filter as a bean, and let spring to the manager life cycle.

and Delegatingfilterproxy itself is a filter,>> genericfilterbean >> Filter

One of the parameter names is Targetbeanname, which is the filter name that requires the proxy, if the name is empty, you will find the name:

<filter-name>springSecurityFilterChain</filter-name>
The Bean.
There is an attribute targetfilterlifecycle that indicates whether to invoke the Init method of the proxy filter.
Called if true, otherwise it is not called.

Spring Delegatingfilterproxy Parsing