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<form action="${pageContext.request.contextPath }/user/register.do" method="post">
<input type="text" id="inputUserName" name="userName" placeholder="请输入用户名" ">
<button type="submit" id="register-btn" onclick="doregister()">注册</button>
@RequestMapping("/user/register")
public String registerUser(@RequestParam(value="userName") String userName) throws Exception {
System.out.println(userName);
}
@RequestMapping("/user/register")
public String registerUser(HttpServletRequest request) throws Exception {
String userName=request.getParameter("UserName");
System.out.println(userName);