[org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size exceeded; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field files exceeds its maximum permitted size of 1048576 bytes.] to ModelAndView: reference to view with name '/error'; model is {exception=Maximum upload size exceeded; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field files exceeds its maximum permitted size of 1048576 bytes.}

大概意思就是說，上傳的檔案太大了，超過自身限制了

我在Controller裡面還加了限制，打斷點並沒有走到這裡來

if (file.isEmpty()) {
	return Result.error("檔案為空！");
}
// 上傳檔案
if (file.getSize() > 5 * 1024 * 1024) {
	return Result.error("檔案大小超出範圍！");
}

The field files exceeds its maximum permitted size of 1048576 bytes.

1024*1024 = 1048576 = 1M

經過各種試驗得出spring boot 預設的上傳檔案大小是1024b*1024b

實現方式1： 在spring boot的啟動類中加入下面配置

/**
     * 檔案上傳配置
     * @return
     */
    @Bean
    public MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        //單個檔案最大 5M
        factory.setMaxFileSize("5120KB"); //KB,MB
        /// 設定總上傳資料總大小
        factory.setMaxRequestSize("102400KB");
        return factory.createMultipartConfig();
    }
 

實現方式2：在配置檔案中加入配置

spring:
  servlet:
    multipart:
      max-file-size: 2Mb
      max-request-size: 2Mb

再測試一下就ok了

spring boot 2.0環境，之前的配置稍微有一點不同