In Struts2, the value read from the foreground JSP page is null

Problem description:
has the name attribute in the HTML (JSP) page, but the value printed out in the background is null.

problem solved:
really spit out blood. The member variables of the action class corresponding to the (HTML) JSP should have the same value as the name attribute of the input tag in the HTML (JSP).

my struts.xml configuration

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