org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size exceeded; nes

使用springboot上传文件,当文件超过2M报出异常

异常显示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)

请求被拒绝，因为其大小（2325669）超过了配置的最大值（2097152）,可见对于上传文件的请求有个默认配置最大值是2M

于是我们上传1M多的文件时,结果报出异常

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

字段mfile超出其最大允许大小1048576字节,可见对于MultipartFile文件也有限制,默认限制是1M

于是我们上传小于1M文件,这次终于成功了,但是我们平时上传文件不可能只是小于1M或2M的,还需要修改这个配置

怎么去修改呢

不同版本，对应的设置值不一样

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

比如在2.0设置

spring.servlet.multipart.maxFileSize=30MB

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

spring.servlet.multipart.maxRequestSize=-1

另一种方法

写一个config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;

@Configuration
public 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