@WebServlet("/pay")
public class PayServlet extends HttpServlet {

    private Logger logger = LoggerFactory.getLogger(PayServlet.class);

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //1. 产生Token
        String token = UUID.randomUUID().toString();
        //2. 放入session
        HttpSession session = req.getSession();
        session.setAttribute("token",token);
        //3. 放入表单
        req.setAttribute("token",token);

        req.getRequestDispatcher("/WEB-INF/views/pay.jsp").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1. 从表单中获取Token
        String token = req.getParameter("token");
        //2. 从session中获取token
        HttpSession session = req.getSession();
        String sessionToken = (String) session.getAttribute("token");
        //3. 判断表单中的token和session中的token是否一致
        if(token != null && token.equals(sessionToken)) {

            //4. 将session中的token删除
            session.removeAttribute("token");

            String money = req.getParameter("money");
            logger.info("成功扣款{}元",money);

            //请求转发的形式去了结果页面
            req.getRequestDispatcher("/WEB-INF/views/paysuc.jsp").forward(req,resp);
        } else {
            logger.warn("表单重复提交");
            req.getRequestDispatcher("/WEB-INF/views/payerror.jsp").forward(req,resp);
        }






        //resp.sendRedirect("/pay/suc");

    }

2.支付成功PaySuccessServlet

@WebServlet("/pay/suc")
public class PaySuccessServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.getRequestDispatcher("/WEB-INF/views/paysuc.jsp").forward(req,resp);
    }
}

3.支付pay

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <form action="/pay" method="post">
        <input type="hidden" name="token" value="${requestScope.token}">
        <input type="text" name="money">
        <button>支付</button>
    </form>
</body>
</html>

4提示重复提交payerror

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <h3>提交异常!</h3>
    <ul>
        <li>可能进行了重复提交</li>
        <li>服务器端正在升级...</li>
    </ul>
</body>
</html>

5.支付成功页面paysuc

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <h3>支付成功,感谢惠顾!</h3>
</body>
</html>
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