Implementation of servlet graphic verification code function in Java Web Development

I. origin of verification code

In Web project development, in order to prevent some people from using automatic tools (such as automatic registration machine) for batch data processing, verification codes are added to different function nodes for verification, so as to achieve the shielding effect of automatic software

The most classic applications, such as: website registration graphics verification code; Next, a graphic verification code program required for website registration is implemented through Java technology and servlet, which provides you with reference.

Second, achieve the effect of graphic verification code on the registration page

1. Create a web project: Java_ servlet_ verifyimg

2. Create a controller that automatically generates graphic verification code -- verifyimgservlet

3. Create a registration controller - registservlet

4. Configure Servlet

5. Create a registration view test page - register jsp

5.1 create registration result page - result jsp

6. Test

(1) A. open the browser and enter the test address: http://localhost:8080/java_servlet_verifyimg ； The following page appears

b. Enter the registered account, password and verification code and click Register to submit

c. The test result will jump to the registration page and prompt that the registration is successful

(2) Open the registration page

Enter the wrong registration code

Test results page

over!

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