Caused by: java.io.IOException: The temporary upload location [......] is not valid

在服务器tomcat文件夹下的logs文件夹，可以打开catalina.out文件，这个文件是tomcat保存全部日志信息的文件：

但是在上传文件的时候，没有上传成果，经过debug调试之后，可以看到如下报错信息：

2022-07-13 17:32:23.182 [http-nio-8080-exec-9] ERROR c.t.c.a.ExceptionControllerAdvice - org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.io.IOException: The temporary upload location [/opt/server/apache-tomcat-9.0.8/work/Catalina/localhost/cr] is not validat org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:112)at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.<init>(StandardMultipartHttpServletRequest.java:86)
......
Caused by: java.io.IOException: The temporary upload location [/opt/server/apache-tomcat-9.0.8/work/Catalina/localhost/cr] is not validat org.apache.catalina.connector.Request.parseParts(Request.java:2795)at org.apache.catalina.connector.Request.parseParameters(Request.java:3164)
......

这个错误只需要在服务器新建

/opt/server/apache-tomcat-9.0.8/work/Catalina/localhost/cr

文件夹即可。

但是在服务器运行时，我没有看到这个文件夹下面有文件，然而，这个文件夹却必须要存在。

具体原因我认为是文件在上传的时候会在服务器临时保存，但是临时保存文件并且已经生成了链接之后，文件就马上被删除了。

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