The temporary upload location [/tmp/tomcat.2416660726146598777.8083/work/Tomcat/localhost/a] is not

The temporary upload location [/tmp/tomcat.2416660726146598777.8083/work/Tomcat/localhost/playmath-base] is not valid] with root cause

今天遇到一个问题, 前一段时间写的接口, 今天调用了一下报以下异常:

2019-01-09 16:54:20.745 [ http-nio-8083-exec-3 ] - [ ERROR ] [ o.a.c.c.C.[.[.[/playmath-base].[dispatcherServlet] : 182 ] - Servlet.service() for servlet [dispatcherServlet] in context with path [/playmath-base] threw exception [Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is java.io.IOException: The temporary upload location [/tmp/tomcat.2416660726146598777.8083/work/Tomcat/localhost/playmath-base] is not valid] with root cause
java.io.IOException: The temporary upload location [/tmp/tomcat.2416660726146598777.8083/work/Tomcat/localhost/playmath-base] is not valid
   at org.apache.catalina.connector.Request.parseParts(Request.java:2859)
   at org.apache.catalina.connector.Request.getParts(Request.java:2793)
   at org.apache.catalina.connector.RequestFacade.getParts(RequestFacade.java:1084)
   at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:93)
   at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.<init>(StandardMultipartHttpServletRequest.java:86)
   at org.springframework.web.multipart.support.StandardServletMultipartResolver.resolveMultipart(StandardServletMultipartResolver.java:93)
   at org.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1128)
   at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:960)
   at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
   at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)
   at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
   at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
   at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
   at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
   at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
   at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
   at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)
   at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
   at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
   at java.lang.Thread.run(Thread.java:748)

原因:

在Linux系统中, SpringBoot应用使用java -jar命令启动服务时, 会在操作系统的/tmp目录下生成一个tomcat*的文件目录, 如果form指定了enctype="multipart/form-data", 提交请求时要转换成临时文件保存在这个文件夹下面. 由于临时/tmp目录下的文件, 在长时间(10天)没有使用的情况下, 就会被系统自动删除掉.

解决方法:

1.直接重启项目, 会重新生成一个临时/tmp文件夹

2.在配置文件中配置tomcat的临时目录

server.tomcat.basedir=/home/temp

3.写一个配置类, 通过@Bean的方式配置目录

/**
 * 文件上传临时路径
 */
@Bean
MultipartConfigElement multipartConfigElement() {
    MultipartConfigFactory factory = new MultipartConfigFactory();
    factory.setLocation("/home/temp");
    return factory.createMultipartConfig();
}

4.把enctype="multipart/form-data" 改成为 enctype="application/x-www-form-urlencoded", 例如:

The temporary upload location [/tmp/tomcat.2416660726146598777.8083/work/Tomcat/localhost/a] is not

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