SpringBoot 上传文件 Caused by: java.io.IOException: The temporary upload location [***] is not valid

Caused by: java.io.IOException: The temporary upload location [C:\Users\coffee\AppData\Local\Temp\tomcat.8572785615189560421.9999\work\Tomcat\localhost\ROOT] is not valid
    at org.apache.catalina.connector.Request.parseParts(Request.java:2776)
    at org.apache.catalina.connector.Request.parseParameters(Request.java:3176)
    at org.apache.catalina.connector.Request.getParameter(Request.java:1110)
    at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:381)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:70)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.springframework.cloud.sleuth.instrument.web.TraceFilter.doFilter(TraceFilter.java:150)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:107)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    ... 12 common frames omitted

因为是测过的代码，所以可以保证不是我本地代码异常，一定是服务器有问题，查询后确认，原来是文件上传临时上传文件夹失效了，可能是系统清除了临时目录。

原因分析：

1. 文件上传，临时文件夹无效

2. 系统可能删除了临时目录

解决方案一：

重启服务，临时方案：会重新生成tomcat目录，但是生产环境不建议如此操作；

解决方案二：

1增加服务配置，自定义baseDir：

2启动时增加参数-Djava.io.tmpdir=自定义目录

解决方案三：注入一个bean，手动配置临时目录，建议有项目组统一配置，便于管理和错误定位。

    //注入对象
    @Bean
    MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        factory.setLocation("d:/tmp");
        return factory.createMultipartConfig();
    }

或者在配置文件配置文件夹，手动的将临时文件夹设置为自定义的文件夹

server.tomcat.basedir= /data/apps/temp

文章参考：

https://blog.csdn.net/m386084855/article/details/79041621

https://blog.csdn.net/She_lock/article/details/80231502

http://blog.csdn.net/daniel7443/article/details/51620308

http://blog.csdn.net/u012706811/article/details/52833682

http://blog.csdn.net/awhip9/article/details/75246558

http://hungryant.github.io/spring/2017/07/24/java-multipart-tomcat-tmp.html

SpringBoot 上传文件 Caused by: java.io.IOException: The temporary upload location [***] is not valid

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