captcha implementation in java

CAPTCHA implement verification code to verify the user login, to prevent the password from being violently cracked.The following is run in the SPRINGMVC framework.imported jar Packages:Kaptcha-2.3.2.jar: http://download.csdn.net/detail/u013147600/905

Note that spring MVC is implemented through annotation. If you want to know how to use spring annotation, go somewhere else, or I will write a new article later! Prerequisites: the jar package kaptcha-2.3.2.jar is required as

http://bbs.csdn.net/topics/390426978public static String Readcheckimage (hashmap requestmap) {String url = requestmap.get ("url");if (Requestmap.get ("params") = null) {URL + = "?" + requestmap.get ("params");}InputStream in = null;try

The role of the CAPTCHA:1, to prevent advertising machine registration and posting, comments.2, to prevent brute force password, especially the password with administrator privileges.Here is a very useful verification code generation tool:

Atitit. Get Verification code picture by Web1. WebRequest for lower level access ( not recommended ) 12. WebBrowser 13. Clipboard Copy method Clipboard ( recommended ) 14. C # take WebBrowser picture can be used to get verification code 11.

Apache Shiro is a powerful and easy-to-integrate open-source rights framework that enables authentication, authorization, encryption, session management, and more. Authentication and authorization are the core of authority control, simply,

Next on the Java Verification Code production (above) to introduce you to the Java Verification Code related knowledge! Method Three: With the open source component Jcaptcha implementation, the use of the spring combination can produce multiple

Apache Shiro is a powerful and easy-to-integrate open-source rights framework that enables authentication, authorization, encryption, session management, and more. Authentication and authorization are the core of authority control, simply,

Apache Shiro is a powerful and easy-to-integrate open-source rights framework that enables authentication, authorization, encryption, session management, and more. Authentication and authorization are the core of authority control, simply,

Lin Bingwen Evankaka Original works. Reprint please specify the source Http://blog.csdn.net/evankakaFirst, the realization of the idea:(1) First, you need to create a servlet. The servlet returns a picture to the client through a byte-type response.