java - 将 HTML 输入日期映射到 Java 对象的 LocalDate

Question

我有一个输入字段(类型:“日期”) - 谁可以使用 Thymeleaf 将其映射到我的对象中的“LocalDate”字段？

对象

public class Project {

    @Id
    private int id;

    private LocalDate startDate;

    private LocalDate endDate;
}

HTML 输入

  <form action="#"
      th:action="@{|/admin/projects/add/save|}"
      th:object="${newProjects}"
      method="POST"
      class="form-horizontal">
        
    <input type="date" class="form-control" id="startDate"
                       placeholder="Project start"
                       th:field="*{startDate}"/>

    <input type="date" class="form-control" id="endDate"
                       placeholder="Project start"
                       th:field="*{endDate}"/>
                       
</form>

如何将输入字段正确映射到 LocalDate startDate 或 endDate？

Controller

//GetMapping for Projects is also there, but I didn't paste it to keep clarity

@PostMapping("/add/save")
public String saveProject(@Valid @ModelAttribute("project") Project project,
                          BindingResult bindingResult,
                          Model model,
                          RedirectAttributes redirectAttributes) {

// bindingResult has error, because Thymeleaf can't map from the input-field to startDate

  if (!bindingResult.hasErrors()) {
      project.save(project);
      return "redirect:/admin/projects/list";
  } else {
      return "admin/projects/add";
  }
}

异常

Failed to convert property value of type 'java.lang.String' to required type 'java.time.LocalDate' for property 'startDate'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@javax.persistence.Column java.time.LocalDate] for value '2017-09-08'; nested exception is java.lang.IllegalArgumentException: Parse attempt failed for value [2017-09-08]

Answer 1

您有几个选择:

1 - 尝试:

@DateTimeFormat(pattern = "yyyy-MM-dd")
private LocalDate startDate;

@DateTimeFormat(pattern = "yyyy-MM-dd")
private LocalDate endDate;

2 - Use Thymeleaf Extras