Spring boot臨時文件目錄報錯

基本的錯誤信息如下：

2018-03-05 at 15:12:03 CST ERROR org.apache.juli.logging.DirectJDKLog 181 log - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.io.IOException: The temporary upload location [/tmp/tomcat.5697655521198317313.8080/work/Tomcat/localhost/ROOT] is not valid] with root cause java.io.IOException: The temporary upload location [/tmp/tomcat.5697655521198317313.8080/work/Tomcat/localhost/ROOT] is not valid
	at org.apache.catalina.connector.Request.parseParts(Request.java:2846) ~[tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.connector.Request.parseParameters(Request.java:3215) ~[tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.connector.Request.getParameter(Request.java:1145) ~[tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:381) ~[tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:75) ~[spring-web-4.3.10.RELEASE.jar!/:4.3.10.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.10.RELEASE.jar!/:4.3.10.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.10.RELEASE.jar!/:4.3.10.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.10.RELEASE.jar!/:4.3.10.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106) ~[spring-boot-actuator-1.5.6.RELEASE.jar!/:1.5.6.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.10.RELEASE.jar!/:4.3.10.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:677) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_151]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_151]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.16.jar!/:8.5.16]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]

2018-03-05 at 15:15:00 CST INFO  org.quartz.plugins.history.LoggingJobHistoryPlugin 469 jobToBeExecuted - Job default.HostsRetrieveJob_0 fired (by trigger default.HostsRetrieveJob_0) at:  15:15:00 03/05/2018
2018-03-05 at 15:15:00 CST INFO  com.cmcc.cdn.platform.ops.quartz.jobs.HostsRetrieveJob 76 execute - Retrieve Hosts from cdn-cmdb
2018-03-05 at 15:15:00 CST INFO  org.quartz.plugins.history.LoggingJobHistoryPlugin 513 jobWasExecuted - Job default.HostsRetrieveJob_0 execution complete at  15:15:00 03/05/2018 and reports: null

如果是線上問題暫時不方便修改代碼最直接的解決方式就是手動創建這個報錯的目錄：[/tmp/tomcat.5697655521198317313.8080/work/Tomcat/localhost/ROOT]

這個問題的產生可能原因有很多，如：創建目錄的權限問題，上傳文件的大小限制配置問題…
[Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.io.IOException: The temporary upload location [/tmp/tomcat.3814974221022613431.8080/work/Tomcat/localhost/ROOT] is not valid] with root causejava.io.IOException: The temporary upload location [/tmp/tomcat.3814974221022613431.8080/work/Tomcat/localhost/ROOT] is not valid

原因：

1.spring boot的應用服務在啟動的時候，會生成在操作系統的/tmp目錄下生成一個Tomcat.*的文件目錄，用於"java.io.tmpdir"文件流操作TomcatEmbeddedServletContainerFactory

2.程序對文件的操作時：會生成臨時文件，暫存在臨時文件中；lunix 系統的tmpwatch 命令會刪除10天未使用的臨時文件；長時間不操作，導致/tmp下面的tomcat臨時文件目錄被刪除，且刪除的文件不可恢復，上傳文件時獲取不到文件目錄，報錯

解決方案：

1.重啟服務，臨時方案：會重新生成tomcat目錄，但是生產環境不建議如此操作；

2.1增加服務配置，自定義baseDir：

2.2啟動時增加參數-Djava.io.tmpdir=自定義目錄

3.修改tmpwatch 刪除文件的邏輯，系統級別的命令，不建議操作

4.在網上看到有：編碼的方式catch異常，生成刪除的文件夾；(方法未驗證)
在網上還查閱到較好的解決辦法：
注入一個Bean,手動配置臨時目錄，代碼基本如下：

/**
 * 文件上傳臨時路徑
 */
 @Bean
 MultipartConfigElement multipartConfigElement() {
    MultipartConfigFactory factory = new MultipartConfigFactory();
    factory.setLocation("/app/pttms/tmp");
    return factory.createMultipartConfig();
}

引用：awhip9