java - AbstractWizardFormController 使用带注释的@Controllers

Question

在 Spring Framework 中，AbstractWizardFormController似乎已弃用。如何在 Spring MVC 框架中实现多页表单。（我没有使用网络流）

任何示例或指针都将有助于考虑我在 Spring 中的有限知识。

Answer 1

@Controller 是一种更灵活的方式来定义表单/向导。您应该根据请求的路径/请求参数/请求方法将方法映射到请求。因此，您可以根据需要定义向导的步骤，而不是定义视图列表并根据一些必需的“步骤”参数处理请求（命令对象也将被更透明地处理）。以下是模拟经典 AWFC 功能的方法（这只是一个示例，您可以做的还有很多）。

@Controller
@RequestMapping("/wizard.form")
@SessionAttributes("command")
public class WizardController {

    /**
     * The default handler (page=0)
     */
    @RequestMapping
    public String getInitialPage(final ModelMap modelMap) {
        // put your initial command
        modelMap.addAttribute("command", new YourCommandClass());
        // populate the model Map as needed
        return "initialView";
    }

    /**
     * First step handler (if you want to map each step individually to a method). You should probably either use this
     * approach or the one below (mapping all pages to the same method and getting the page number as parameter).
     */
    @RequestMapping(params = "_step=1")
    public String processFirstStep(final @ModelAttribute("command") YourCommandClass command,
                                   final Errors errors) {
        // do something with command, errors, request, response,
        // model map or whatever you include among the method
        // parameters. See the documentation for @RequestMapping
        // to get the full picture.
        return "firstStepView";
    }

    /**
     * Maybe you want to be provided with the _page parameter (in order to map the same method for all), as you have in
     * AbstractWizardFormController.
     */
    @RequestMapping(method = RequestMethod.POST)
    public String processPage(@RequestParam("_page") final int currentPage,
                              final @ModelAttribute("command") YourCommandClass command,
                              final HttpServletResponse response) {
        // do something based on page number
        return pageViews[currentPage];
    }

    /**
     * The successful finish step ('_finish' request param must be present)
     */
    @RequestMapping(params = "_finish")
    public String processFinish(final @ModelAttribute("command") YourCommandClass command,
                                final Errors errors,
                                final ModelMap modelMap,
                                final SessionStatus status) {
        // some stuff
        status.setComplete();
        return "successView";
    }

    @RequestMapping(params = "_cancel")
    public String processCancel(final HttpServletRequest request,
                                final HttpServletResponse response,
                                final SessionStatus status) {
        status.setComplete();
        return "canceledView";
    }

}

我尝试改变方法签名，以便您了解我提到的灵活性。当然，它还有很多：你可以在 中使用请求方法（GET 或 POST）@RequestMapping，你可以定义一个用 注释的方法@InitBinder，等等。

编辑：我有一个未映射的方法，我已修复（顺便说一下，您需要确保没有不明确的映射——可以映射到多个方法的请求——或未映射的请求——不能被映射的请求）映射到任何方法）。还可以查看 @SessionAttributes、@SessionStatus 和 @ModelAttribute，它们也是完全模拟经典 AWFC 行为所必需的（我已经编辑了代码以使这一点变得清晰）。