Question

我正在用春季靴子（我是初学者）编写货币兑换器代码，现在我被卡在百里香模板上。现在，我的模板如下所示：

<div align="center">
    <form th:action = "@{/postCurrency}" method = "POST">
        <label for="firstNumber"></label>
        <input id = "firstNumber" type="number" name = "fNumber"/>
        <br/>
        <br/>
        <input type="submit" value="Submit">
    </form>
</div>

因此，这意味着我有一个“框”，用户在其中键入数字，现在我想有第二个“框”，其中将交换货币并自动在该“框”中显示货币，我该怎么做？ / p>

编辑：我的模板现在看起来像这样（exchange.html）：

      <form th:action = "@{/postCurrency}" method = "POST">
        <label for="firstNumber"></label>
        <input id = "firstNumber" type="number" name = "fNumber"/>
        <br/>
        <br/>
        <input type="submit" value="Submit">
        <br/>
        <br/>
        <input type = "number" th:field="*{resultNumber}" disabled/>
    </form>

我的控制器类：

  @PostMapping("/postCurrency")
  public String postExchange(@RequestParam Double fNumber , Model model){
    Double number = exchangeLogic.exchange(fNumber);
    model.addAttribute("resultNumber",number);
    return "redirect:/exchange";
}

问题是胸腺无法读取modelattribute，我需要输入“ resultNumber”并使其在表单标记中可见

Answer 1

在您的控制器中尝试此操作。

   @PostMapping("/postCurrency")
  public String postExchange(@RequestParam Double fNumber , Model model){
    Double number = exchangeLogic.exchange(fNumber);
    model.addAttribute("resultNumber",number);
    return "exchange";//your html page
}

以及您的html页面

<input type = "number" th:value="${resultNumber}" disabled/>

让我知道它是否对您有用。

Spring Boot中的货币兑换

1 个答案: