一、背景描述

本项目是个Springboot 项目，功能是要做一个文件上传，在测试时发现报错，上传的是一个 word 文件，大小是 1.25MB，报错内容如下：

Caused by: org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes.

详细报错内容如下图所示：

二、错误原因

SpringBoot 项目在文件上传时出现了 Caused by: org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes. 的错误，显示文件的大小超出了允许的范围。原因是 SpringBoot内嵌的 tomcat 默认的所有上传的文件大小为 1MB，超出这个大小就会报错，解决这个问题需要更改以下两个默认。

multipart.maxFileSize

multipart.maxRequestSize

三、解决方案

解决方案呢，要根据SpringBoot的版本来确定，以下列举出了几种情况，可以根据自己项目的SpringBoot版本来对应：把默认的文件的大小限制修改一下即可。以下是我项目中的用到的文件大小限制，改成50MB即可满足我的需求了。

3.1 SpringBoot 1.3.x 之前

multipart.maxFileSize=50Mb
multipart.maxRequestSize=50Mb

3.2 SpringBoot 1.4.x

spring.http.multipart.maxFileSize=50Mb
spring.http.multipart.maxRequestSize=50Mb

3.3 SpringBoot 2.0.x之后

spring.servlet.multipart.max-file-size=50MB
spring.servlet.multipart.max-request-size=50MB

配置完上述限制之后，重启项目，Bingo，搞定！！！

完结！

【异常】The field file exceeds its maximum permitted size of 1048576 bytes.相关推荐

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【异常】The field file exceeds its maximum permitted size of 1048576 bytes.