PathVariable 允许空

@PathVariable 允许空的情况需要通过设置 required=false 来实现。当设置了 @PathVariable(required = false) 时，如果没有传递对应的参数，Spring MVC 会去找没有替代参数的 URL 进行处理。如果找到了替代的 URL，就可以处理该请求，如果没有找到替代的 URL，就会抛出异常。 因此，通过这种方式可以实现 @PathVariable 允许为空的功能。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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