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遇到这个异常，总结一下这个问题发生的原因：
这个原因是在springmvc中在DispatcherServlet分发请求时，解析不到相应的请求路径。后台要请求的路径应该是“/portal/download”，
由于portal中的第一个单词大写了，在请求的时候就没解析到路径，所以报此错。
修改过之后就可以正常请求了。
还有报此异常的可能是由于在springmvc扫描注解时，没有扫描到也会报此错误。
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