解决org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size exceeded

异常信息：

org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size exceeded; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (2325669) exceeds the configured maximum (2097152)

原因：上传文件的请求有个默认配置最大值是2M 超出了最大值

通过yml配置可以调整，spring版本配置：

Spring Boot 1.3.x and earlier

multipart.maxFileSize

multipart.maxRequestSize

Spring Boot 1.4.x and 1.5.x

spring.http.multipart.maxFileSize

spring.http.multipart.maxRequestSize

Spring Boot 2.x

spring.servlet.multipart.maxFileSize

spring.servlet.multipart.maxRequestSize

以2.0为例：

spring.servlet.multipart.maxFileSize=30MBspring.servlet.multipart.maxRequestSize=30M# 不做限制spring.servlet.multipart.maxFileSize=-1spring.servlet.multipart.maxRequestSize=-1

方法二，重写config配置类

import javax.servlet.MultipartConfigElement; import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.web.servlet.MultipartConfigFactory;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.util.unit.DataSize; @Configurationpublic class TomcatConfig {     @Value("${spring.http.server.maxFileSize}")    private Long maxFileSize;    @Value("${spring.http.server.maxRequestSize}")    private Long maxRequestSize;     @Bean    public MultipartConfigElement multipartConfigElement() {        MultipartConfigFactory factory = new MultipartConfigFactory();        // 单个数据大小        // factory.setMaxFileSize(MaxFileSize); // KB,MB        factory.setMaxFileSize(DataSize.ofMegabytes(maxFileSize));        /// 总上传数据大小        factory.setMaxRequestSize(DataSize.ofMegabytes(maxRequestSize));        // factory.setMaxRequestSize(MaxRequestSize);        return factory.createMultipartConfig();    }}

然后在application.properties文件中配置

spring.http.server.maxFileSize和spring.http.server.maxRequestSize的值,效果是一样的