Try it!
Usage: java -Xmx512m -jar Form_cracker.jar -uf [usernamefield] -pf [passwordfield] -t [targetUrl]
Options:
-af Find fields automatically
-us [username] Single user
-ul [file] Load usernames from file
-ur Load random usernames
-ps [password] Single password
-pl [file] Load passwords from file
-pr Load random passwords
Example:
java -Xmx512m -jar Form_cracker.jar -af -t http://venserv.myftp.org/login.php
or
java -Xmx512m -jar Form_cracker.jar -uf name -pf password -t http://venserv.myftp.org/login.php
If no more arguments are given, the application assumes the arguments ur and pr.
Check out PHP login script here.
Check out the script's source code here.