Verification Code amount implementation of Java----front-end verification

Verification code is one of the most common way of login authentication, the biggest role is to ensure security, verification code generation in Java implemented in a number of ways, such as background generation transmission to the front page, in front of the foreground directly generated for verification, the following is the simplest implementation of verification code verification login example.

Generate Verification Code:

　　

Verification Code Verification Logic:

　　

From form login:

　　

Yes, it's that simple. The scripts generated verification code is set to a global variable displayed on an input label, write a document method to get the value entered when the input box is entered to make a logical judgment, first regardless of whether the login information is wrong, Only the verification code through the case will be the form of the submission, in determining whether the login information is correct or not.

A simple front-end verification code is finished, the students need to directly copy the code to use.

Code: HTTPS://PAN.BAIDU.COM/S/1MIXKZM4 Password: QRBX

Verification Code amount implementation of Java----front-end verification