隐藏值在网络调用中但未到达 spring mvc 控制器

Question

将隐藏字段（开始和结束）从 JSP 传递到 Spring MVC 控制器，但它没有到达，在我的调试点，检查的值为空，但在完成调用后，这些可以在网络调用中清楚地观察到值。为什么不使用 'rental' object

传递隐藏字段的值

JSP代码，

<body>
    <center>
        <table border="1">
            <tr>
                <th><h2>Name</h2></th>
            </tr>
            <c:forEach items="${vehicles}" var="e">
                <tr>
                    <td>${e.vehicleName}</td>
                </tr>
            </c:forEach>
        </table>

        <br> <br>

        <form:form action="bookVehicle.web" method="post"
            modelAttribute="rental">

            <form:select path="vehicle.vehicleId">
                <form:option value="" label="-- Select" />
                <form:options items="${vehicles}" itemValue="vehicleId"
                    itemLabel="vehicleName" />
            </form:select>
            <br>
            <br>

            <b>Enter userId </b>
            <br>
            <br>
            <form:input path="user.email" />
            <br>
            <br>

            <form:hidden path="start" value="${start}" />
            <form:hidden path="end" value="${end}" />

            <input type="submit" value="book" name="bookVehicleBtn" />
        </form:form>

        <br> <br> <a href="index.web">Return To Home Page</a>
    </center>
</body>

@RequestMapping(value = "/bookVehicle.web", method = RequestMethod.POST, params = "bookVehicleBtn")
    public String bookVehicle(Model model, @ModelAttribute("rental") Rental rental, BindingResult error) {
        System.out.println(" inside controller ");
        model.addAttribute("message", rentalService.proceedBooking(rental));    
        return "message";       
    }

Answer 1

请确保您的模型 class 字段（开始和结束）是字符串类型。

隐藏值在网络调用中但未到达 spring mvc 控制器

Hidden value is in network call but not reaching to spring mvc controller

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jsp

spring-mvc

hidden-field