显示表单时未调用 Spring @InitBinder =>自定义编辑器未定义 [英] Spring @InitBinder not invoked when showing form => CustomEditors not defined

问题描述

我有以下(简化到骨骼)控制器:

I have following (simplified to the bone) Controller:

@Controller  
public class TestController  {

@RequestMapping(value = "/test.htm", method = RequestMethod.GET)
public String showForm(final ModelMap map) {
    final TestFilter filter = new TestFilter();
    filter.setStartDate(new Date(System.currentTimeMillis()));
    map.addAttribute("reportPerResourceForm", filter);
    return "test";
}

@InitBinder
public void initBinder(final WebDataBinder binder) {
    binder.registerCustomEditor(Date.class, null, new CustomDateEditor(new SimpleDateFormat("dd/MM/yyyy"), true));
}

}

jsp:

<form:form commandName="reportPerResourceForm" id="reportForm">
    <form:input path="startDate" />
</form:form>

这是我快速创建的控制器，用于测试我在另一个视图控制器上遇到的问题.正如您在 Controller 中看到的，定义了一个 CustomeDateEditor.在我的实际控制人中，这个编辑器工作正常；例如，当您在表单字段中输入 11/01/2010 时，编辑器会很好地将其转换为日期；同样在返回表单时，日期再次很好地转换回字符串.

This is a controller I quickly created to test out an issue I had with another view-controller. As you can see in the Controller a CustomeDateEditor is defined. In my actual controller this editor is working fine; when you enter for instance 11/01/2010 in the form field this is nicely converted into a Date by the editor; also when going back to the form the Date was again nicely converted back to a String.

但是，当我(如在 TestController 中)想在表单上设置默认日期时，这只会在表单字段中显示一个 Date.toString()，而不是使用来自 CustomDateEditor.getAsText() 的返回值！经过一些调试后，我了解到当 RequestMethod == GET 时不会调用我的 InitBinder 方法.这正常吗?

However, when I (as in TestController) want to set a default date on the form then this gets simply displayed a Date.toString() in the form field instead of using the returned value from CustomDateEditor.getAsText()! After some debugging I learned that my InitBinder method is not called when RequestMethod == GET. Is this normal?

我确信我可以通过不使用来解决这个问题

感谢您的帮助，
斯蒂恩

I'm sure I could workaround this by not using

Thanks for your help,
Stijn

推荐答案

使用 @ModelAttribute 在转发到页面之前设置域.

use @ModelAttribute to setup domain before forwarding to page.

在处理spring时要小心使用new，它只会在spring上下文之外创建一个新的对象实例，您不能使用任何spring功能(例如web绑定、验证等).

carefully to use new when you deal with spring, it will just create a new instance of object outside spring context and you cannot use any of spring capability (such as web binding, validation, etc).

示例:

@RequestMapping(value = "/test.htm", method = RequestMethod.GET)
public String showForm(@ModelAttribute yourDomain, final ModelMap map)

在您的域中，您可以使用:

and at your domain you can use :

@DateTimeFormat(pattern="dd/MM/yyyy")
private Date balance = new Date(System.currentTimeMillis());

这篇关于显示表单时未调用 Spring @InitBinder =>自定义编辑器未定义的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！