【参考文章】:Required MultipartFile parameter 'file' is not present
【参考文章】:Springboot2.0中WebMvcConfigurerAdapter过时问题处理
【参考文章】:spring boot EnableAutoConfiguration exclude 无效
实现了 MultipartResolver 常用接口有两个:
一个是 CommonsMultipartResolver:使用Jakarta Commons FileUpload 解析 multipart 请求;
一个是 StandardServletMultipartResolver:依赖于 Servlet 3.0 解析 multipart 请求;
1. StandardServletMultipartResolver
Spring boot 默认使用 StandardServletMultipartResolver 解析 multipart 请求;
@Configuration @ConditionalOnClass({ Servlet.class, StandardServletMultipartResolver.class, MultipartConfigElement.class }) @ConditionalOnProperty(prefix = "spring.servlet.multipart", name = "enabled", matchIfMissing = true) @ConditionalOnWebApplication(type = Type.SERVLET) @EnableConfigurationProperties(MultipartProperties.class) public class MultipartAutoConfiguration { private final MultipartProperties multipartProperties; public MultipartAutoConfiguration(MultipartProperties multipartProperties) { this.multipartProperties = multipartProperties; } @Bean @ConditionalOnMissingBean({ MultipartConfigElement.class, CommonsMultipartResolver.class }) public MultipartConfigElement multipartConfigElement() { return this.multipartProperties.createMultipartConfig(); } @Bean(name = DispatcherServlet.MULTIPART_RESOLVER_BEAN_NAME) @ConditionalOnMissingBean(MultipartResolver.class) public StandardServletMultipartResolver multipartResolver() { StandardServletMultipartResolver multipartResolver = new StandardServletMultipartResolver(); multipartResolver.setResolveLazily(this.multipartProperties.isResolveLazily()); return multipartResolver; } }
2. CommonsMultipartResolver
2.1 排除默认配置
spring:
autoconfigure:
exclude: org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration
2.2 添加 CommonsMultipartResolver 的依赖
<!--文件上传--> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.4</version> </dependency>
2.3 创建文件解析对象
@Slf4j
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
@Bean(name = "multipartResolver")
public MultipartResolver multipartResolver() {
log.info("Loading the multipart resolver");
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
return multipartResolver;
}
}