如何在Spring Security中替换UsernamePasswordAuthenticationFilter

Question

Using XML configuration would be like

<custom-filter position="FORM_LOGIN_FILTER" ref="SCAAuthenticationFilter" />.  

Without XML would be like:

httpSecurity.addFilter(new SCAAthenticationFilter())

It seems that spring doesn't replace UsernamePasswordAuthenticationFilter , but adds my filter before.

Answer 1

If you take a look to FormLoginConfigurer you will see that the UsernamePasswordAuthenticationFilter is created and inserted to AbstractAuthenticationFilterConfigurer constructor then there it is assigned to final F authFilter so there is no way to replace it in Spring Security 4.1

addFilter() will simply add another filter to filter list

Answer 2

I'd guess you must have either had <form-login> or had <http auto-config="true"> in your configuration. Unless either of these are present, Spring Security won't add a UsernamePasswordAuthenticationFilter automatically. The URL for submitting the form and the parameter names are all configurable properties of the filter, which your custom version didn't override, hence the difference.