From the front page to get data from the database and what steps are required? Start a project. Beginners can look wow ~

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This link: https://blog.csdn.net/weixin_43811713/article/details/102767629

Summed up his learning outcomes (one).
Get data (acquired by action or ajax), passed servlet, then remove the data in the database (I use MySQL), processed in the servlet, processed from the front page (html or JSP) in the form form later response back to the front page.
Code is knocking eclipse, detailed steps and logic see below:

is suitable for beginners, it is recommended to follow your hand to knock again ~

---- summary of their own learning, if there Gangster point came in, I feel there is any need to add, find points out (Sahua Sahua ~)