使用带注释的@Controllers的AbstractWizardFormController
问题内容:
在Spring Framework中,AbstractWizardFormController
似乎已弃用。如何在Spring MVC
Framework中实现多页表单。(我没有使用webflow)
任何示例或指针都将有助于考虑我在Spring方面的知识有限。
问题答案:
@Controller是定义表单/向导的更灵活的方法。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某些必需的“
step”参数处理请求)(还将更透明地处理命令对象)。这是模拟经典AWFC功能的方法(这仅是一个示例,您可以做很多事情)。
@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";
}
}
我试图改变方法签名,以便您对我提到的灵活性有所了解。当然,还有很多其他功能:您可以在中使用请求方法(GET或POST)@RequestMapping
,可以定义带有注释的方法@InitBinder
,等等。
编辑: 我有一个固定的未映射方法(顺便说一句,您需要确保您没有模棱两可的映射-可以映射到多个方法的请求-或未映射的请求-
无法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的行为所必需的(我已经编辑了代码以使这一点变得清楚)。