页面中一个form表单，给submit的input标签绑定一个点击事件，代码如下：

<form method="get" action="/login">
    <input type="text" placeholder="请输入用户名" id="username" name="username" required/>
    <input type="password" placeholder="请输入密码" id="password" name="password" required/>
    <input type="submit" onclick="login()" value="登录" />
</form>

js代码是login函数，获取表单将其序列化，代码：

function login(){
	var formData=$("form").serialize();//form对象然后序列化
    $.ajax({
		type: "POST",
		url: "login",
		processData:true,
		data:formData,
		success: function(msg){
			window.alert(msg)
		}
	})
}

后端获取表单提交来的值，代码：

@RequestMapping("/login")
@ResponseBody
public String login(Model model, HttpServletRequest request, HttpServletResponse response){
	String username = request.getParameter("username");
	String password = request.getParameter("password");
	System.out.println(username+":"+password);
    return "登录成功";
}