html

<form method="post" action="testform1.do">
    <input type="text" name="username">
    <input type="text" name="userpwd">
    <input type="submit" value="提交">
</form>
------------------------------------------
<form method="post" action="testform2.do">
    <input type="text" name="username">
    <input type="text" name="userpwd">
    <input type="submit" value="提交">
</form>
------------------------------------------
<form method="post" action="testform3.do">
    <input type="text" name="username">
    <input type="text" name="userpwd">
    <input type="submit" value="提交">
</form>

controller

@PostMapping("testform1.do")
public String testform1(String username, String userpwd){
    return username + "----" + userpwd;
}

@PostMapping("testform2.do")
public String testform2(UserInfo userInfo){
    return userInfo.toString();
}

@PostMapping("testform3.do")
public String testform3(HttpServletRequest request){
    return request.toString();
}