解决SpringBoot文件上传的临时目录被删除导致上传文件失败

服务报错

 /tmp/tomcat.582075295829581120.7301/work/Tomcat/localhost/*** (No such file or directory)

很多解决方案都是配置修改临时存储目录或者修改服务器tmp的配置文件，修改清理时间，我觉得都复杂了。

我的解决方法是查看源代码发现在setServletContext时,会读取系统配置的临时缓存文件目录

if (!this.isUploadTempDirSpecified()) { 
         this.getFileItemFactory().setRepository(WebUtils.getTempDir(servletContext));
}

getTempDir方法实现

public static File getTempDir(ServletContext servletContext) {
        Assert.notNull(servletContext, "ServletContext must not be null");
        return (File)servletContext.getAttribute("javax.servlet.context.tempdir");
    }

 所以只需要判断读取到的目录是否存在就可以了

CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
        ServletContext servletContext = request.getSession().getServletContext();
        String temporaryDirectory = servletContext.getAttribute("javax.servlet.context.tempdir").toString();
        File tmpFile = new File(temporaryDirectory);
        if (!tmpFile.exists()) {
            log.info("目录被删除重新创建"+temporaryDirectory);
            tmpFile.mkdirs();
        }
        multipartResolver.setServletContext(request.getSession().getServletContext());