Spring:将String从View转换为Calendar对象

Question

如何将表单输入(easyui-datetimebox,以防万一)中的字符串转换为Controller中对象的Calendar属性,由Spring自动进行？

我已经阅读了http://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/validation.html,但我找不到任何接近正确的地方.

JSP:

<input id="DeadLineDate"
  class="easyui-datetimebox" 
  name="DeadLineDate"
  value="${SessionDeadLineDate}"
  data-options="formatter:myformatter,
                parser:myparser
/>

当提交时,Spring验证会抛出一个错误:

Failed to convert property value of type java.lang.String to required type java.util.Calendar for property DeadLineDate; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [java.util.Calendar] for property DeadLineDate: no matching editors or conversion strategy found.

PS:春天3

编辑:添加控制器的方法来执行操作:

@Controller
@RequestMapping("/project/MaintainProjectFrm")
@SessionAttributes({"project","SessionDeadLineDate"})
public class MaintainProjectController {

    /* ... many methods... */

    @RequestMapping(params = "update", method = RequestMethod.POST, produces={"text/plain; charset=UTF-8"})
    public String update(@ModelAttribute("project") Project project, 
                            BindingResult result, 
                                    SessionStatus status, 
                                        ModelMap model,
                                            HttpServletRequest req,
                                                HttpServletResponse resp) throws IOException {

        projectValidator.validate(project, result);

        if (result.hasErrors()) {
             //has errors, in this case, that one shown in text above, which is rendered again in view (JSP)
            return "/project/MaintainProjectFrm";
        } else {

            try{
                mpService.updateProject(project);
            }
            catch(Exception e){
                resp.setStatus(500);
                resp.getWriter().write("Error updating project: " + e.getMessage());
                return "/project/MaintainProjectFrm";
            }

            status.setComplete();

        }
    }

    /* ... yet other methods ... */
}

Answer 1

我假设你的Project类有字段DeadLineDate(字段应该以小写字符开头).

用@DateTimeFormat这样的方式注释它

@DateTimeFormat(pattern = "yyyy/MM/dd") // or whatever pattern you want
private Calendar DeadLineDate;

然后,您的客户需要发送适当的模式.