Thymeleaf 并提交表单 POST

Question

专家，

我正在努力从 Themeleaf 调用控制器。

我的主题代码如下：

<form action="#" th:action="@{/order}" modelAttribute="order" th:object="${order}"  method="POST">
                <div class="div">
                        <h5>Amount</h5>
                        <input type="text" class="input" th:field="*{amountValue}">
                    </div>

                <input type="submit" class="btn" value="Process Payment">
            </form>

我的控制器代码是：

@RequestMapping(value = "/order", method = RequestMethod.POST)
    public  ModelAndView processOrder(@ModelAttribute Order order) {
        ModelAndView modelAndView = new ModelAndView();
        String accessToken = token();
        String paymentURL = null;
        if (accessToken != null) {
            paymentURL = placeOrder(accessToken, order);
            if (paymentURL != null) {
                modelAndView.addObject("orderReferenceNumber", paymentURL.substring(paymentURL.indexOf("=") + 1));
                modelAndView.addObject("paymentURL", paymentURL + "&slim=true");
                modelAndView.setViewName("paymentProcess");
                return modelAndView;
            }
        }
        return modelAndView;

    }

我的 Get 方法是

@RequestMapping(value = "/index", method = RequestMethod.POST)
    public ModelAndView doLogin(@RequestParam(value = "username", required = true) String username,
            @RequestParam(value = "password", required = true) String password) {
         ModelAndView modelAndView = new ModelAndView();
        if (username != null && password != null) {
            if (username.equalsIgnoreCase("one") && password.equalsIgnoreCase("one")) {
                 modelAndView.addObject("order", new Order());
                 modelAndView.setViewName("index"); 
                 return modelAndView;
            }
        }
         modelAndView.setViewName("welcome"); 
         return modelAndView;
    }

点击按钮出错

Error resolving template [order], template might not exist or might not be accessible by any of the configured Template Resolvers
org.thymeleaf.exceptions.TemplateInputException: Error resolving template [order], template might not exist or might not be accessible by any of the configured Template Resolvers

我做错了什么？

Answer 1

问题在于您如何填充 ModelAndView 实例。只有当您的两个if 子句匹配时，您才能使用modelAndView.setViewName("paymentProcess"); 设置视图的名称。这意味着对于某些执行（不匹配您的两个条件），您根本不设置视图的名称，并且 Spring MVC 不知道要渲染并返回给用户的视图。

要解决此问题，请确保您始终设置默认/fallabck 视图以在if 条件都不是true 的情况下返回。您的代码可能会覆盖此视图名称，但对于每种情况，您至少有一个可以回退的视图：

@RequestMapping(value = "/order", method = RequestMethod.POST)
public  ModelAndView processOrder(@ModelAttribute Order order) {
    ModelAndView modelAndView = new ModelAndView();
    modelAndView.setViewName("yourDefaultViewName"); // this is the important line
    String accessToken = token();
    String paymentURL = null;
    if (accessToken != null) {
        paymentURL = placeOrder(accessToken, order);
        if (paymentURL != null) {
            modelAndView.addObject("orderReferenceNumber", paymentURL.substring(paymentURL.indexOf("=") + 1));
            modelAndView.addObject("paymentURL", paymentURL + "&slim=true");
            modelAndView.setViewName("paymentProcess");
            return modelAndView;
        }
    }
    return modelAndView;

}