Spring MVC:如何指示是否需要路径变量? [英] Spring MVC: how to indicate whether a path variable is required or not?

问题描述

我正在做一个Spring网站.对于控制器方法，我可以使用RequestParam指示是否需要该参数.例如:

I am doing a Spring web. For a controller method, I am able to use RequestParam to indicate whether a parameter it is required or not. For example:

@RequestMapping({"customer"}) 
public String surveys(HttpServletRequest request, 
@RequestParam(value="id", required = false) Long id,            
Map<String, Object> map)

我想使用如下所示的PathVariable:

I would like to use PathVariable such as the following:

@RequestMapping({"customer/{id}"}) 
public String surveys(HttpServletRequest request, 
@PathVariable("id") Long id,            
Map<String, Object> map) 

如何指示是否需要路径变量?我需要将其设置为可选，因为在创建新对象时，在保存之前没有可用的关联ID.

How can I indicate whether a path variable is required or not? I need to make it optional because when creating a new object, there is no associated ID available until it is saved.

感谢帮助！

推荐答案

无法将其设为可选，但是您可以创建两个方法，其中一个具有@RequestMapping({"customer"})注释，另一个具有@RequestMapping({"customer/{id}"})注释，然后采取相应措施在每个.

There's no way to make it optional, but you can create two methods with one having the @RequestMapping({"customer"}) annotation and the other having @RequestMapping({"customer/{id}"}) and then act accordingly in each.

这篇关于Spring MVC:如何指示是否需要路径变量?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！