1. Write the parameters of the form directly in the formal parameters of the corresponding method of Controller
public String addUser1 (String username,String password)
and bind the request parameter
public String addUser6 (@ RequestParam ("username") String username)
2. Receive
public String addUser3 (UserModel user)
and FORM form data
public String addUser5 (@ ModelAttribute ("user") UserModel user)
@ RequestParam: if @ RequestParam is used in the method, the argument will only be injected into the parameter labeled @ RequestParam
bean: is automatically injected into the parameter that satisfies the argument name
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