如何使用spring和thymeleaf获取Hashmap中的发布值?

问题描述

美好的一天，

我正在尝试通过 Hashmap 显示选择字段选项并获取发布的值.

I am trying to show the select field options by Hashmap and get the posted value back too.

我使用了两个类，一个用于控制器，另一个用于模型.

I am using two classes one is for controller and the other for model.

public class MyForm {
   private int id;
   private Map<String, String> list;
   //getter setters
}

@Controller
public class MyController {

  @GetMapping("/create")
  public String showForm(MyForm myForm) {
    Map<String, String> list = new HashMap();
    list.put("US", "United States")
    list.put("UK", "United Kingdom")
    return "myview"
  }


  @PostMapping("/create")
  @ResponseBody
  public String showForm(MyForm myForm) {

    return "id: " + myform.getId() + " list: " + myform.getList();
  }

}

这是模板.

<form th:action="@{/create}" th:object="${myForm}" method="POST">
 <p>Id: <input type="text" th:field="*{id}" /></p>
 <p>
 Countries :
 <select id="list" name="list">
  <option th:each="c : *{list}" th:value="${c.key}" th:text="${c.value}"></option>
 </select>
 <p><input type="submit" value="Submit" /> <input type="reset" value="Reset" /></p>
</form>

当我打开 localho:8080/test 时，它会向我显示一个文本字段并选择包含美国和英国两个选项的文件.

when i open localho:8080/test its show me a text field and select filed with both options united states and united kingdom.

在 id 字段中输入 1 并选择英国后，我按下提交按钮，它显示

After typing 1 in id field and choosing united kingdom and then i press submit button it shows

1, null

请帮我解决这个问题.

谢谢.

推荐答案

没关系.

我通过添加额外的字段来做到这一点.

I have done it by adding extra field.

List<String> country;

在 MyForm 模型类中，并为 thymeleaf 中的选择字段指定名称 country.

in MyForm model class and assigned name country to the select field in thymeleaf.

<select id="country" name="country">
<option th:each="c : *{list}" th:value="${c.key}" th:text="${c.value}"></option>
</select>

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