FAQ:The field file exceeds its maximum permitted size of 1048576 bytes.

Spring Boot做文件上传时出现了The field file exceeds its maximum permitted size of 1048576 bytes.错误，显示文件的大小超出了允许的范围。查看了官方文档，原来Spring Boot工程嵌入的tomcat限制了请求的文件大小，这一点在Spring Boot的官方文档中有说明，原文如下

65.5 Handling Multipart File Uploads
Spring Boot embraces the Servlet 3 javax.servlet.http.Part API to support uploading files. By default Spring Boot configures Spring MVC with a maximum file of 1Mb per file and a maximum of 10Mb of file data in a single request. You may override these values, as well as the location to which intermediate data is stored (e.g., to the /tmp directory) and the threshold past which data is flushed to disk by using the properties exposed in the MultipartProperties class. If you want to specify that files be unlimited, for example, set the multipart.maxFileSize property to -1.The multipart support is helpful when you want to receive multipart encoded file data as a @RequestParam-annotated parameter of type MultipartFile in a Spring MVC controller handler method.

文档说明表示，每个文件的配置最大为1Mb，单次请求的文件的总数不能大于10Mb。要更改这个默认值需要在配置文件（如application.properties）中加入两个配置

multipart.maxFileSize = 10Mb
multipart.maxRequestSize=100Mb

multipart.maxFileSize=10Mb是设置单个文件的大小, multipart.maxRequestSize=100Mb是设置单次请求的文件的总大小

如果是想要不限制文件上传的大小，那么就把两个值都设置为-1就行啦

*****************************后续更新******************************如果有误，请查看文末提示官方文档哈

Spring Boot1.4版本后配置更改为:

spring.http.multipart.maxFileSize = 10Mb
spring.http.multipart.maxRequestSize=100Mb

Spring Boot2.0之后的版本配置修改为:

spring.servlet.multipart.max-file-size = 10MB
spring.servlet.multipart.max-request-size=100MB

详情参考Spring Boot官方文档，感谢评论的小伙伴给出的建议更新提示。

**************

重要：如果以上的配置有误，尝试将=更改为:或者将Mb单位更改为MB，Spring Boot版本迭代很快，请以Spring Boot的官方文档为准。

Spring Boot各版本文档地址（比较齐全）

https://docs.spring.io/spring-boot/docs/

进入reference/html/目录就是了。

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