How to work with Java Filters to redirect the user if is logued
I have in my application a few url:
/
/SignIn
/SignUp
In "/" is my homepage where the user can log in into my app.
I want like Gmail and other services that "/", "/SignUp", "/SignIn" will be available to the users not loged in. And when the user logs in into my application that if he goes to "/" or "/SignUp" or "/SignIn" redirect him into my app backend page "/Backend".
How can I deal with this with Java Filters?
Show I create one filter and for this 开发者_如何学Cfilter many mappings in this way?
<filter-mapping>
<filter-name>AuthorizationFilter</filter-name>
<url-pattern>/</url-pattern>
<filter-mapping>
<filter-name>AuthorizationFilter</filter-name>
<url-pattern>/SignIn</url-pattern>
</filter-mapping>
etc?
A single filter which is mapped on /*
is sufficient. Just check request URI in the filter itself.
Basic kickoff example:
if (path.equals("/") || path.equals("/SignIn") || path.equals("/SignUp")) {
if (user == null) {
chain.doFilter(request, response);
} else {
response.sendRedirect("/Backend");
}
} else if (user != null) {
chain.doFilter(request, response);
} else {
response.sendRedirect("/SignIn"); // Or "/" or "/SignUp".
}
精彩评论