SpringBoot中的multipartResolver上传文件配置 SpringBoot中的multipartResolver上传

multipartResolver上传文件配置

1、gradle配置
2、注册Bean

SpringBoot MultipartResolver的坑

解决方案

multipartResolver上传文件配置 【SpringBoot中的multipartResolver上传文件配置】
1、gradle配置

compile ('commons-io:commons-io:1.4')compile('commons-fileupload:commons-fileupload:1.2.1')

2、注册Bean

@Bean(name = "multipartResolver")public MultipartResolver multipartResolver(){CommonsMultipartResolver resolver = new CommonsMultipartResolver(); resolver.setDefaultEncoding("UTF-8"); //resolveLazily属性启用是为了推迟文件解析，以在在UploadAction中捕获文件大小异常resolver.setResolveLazily(true); resolver.setMaxInMemorySize(40960); //上传文件大小 50M 50*1024*1024resolver.setMaxUploadSize(50*1024*1024); return resolver; }

SpringBoot MultipartResolver的坑在使用springBoot上传文件的时候，我们会用到MultipartResolver。我看通过源码可以看到

@Configuration@ConditionalOnClass({ Servlet.class, StandardServletMultipartResolver.class,MultipartConfigElement.class })@ConditionalOnProperty(prefix = "spring.http.multipart", name = "enabled", matchIfMissing = true)@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; }

可以看出MultipartAutoConfiguration配置类，默认加载的是StandardServletMultipartResolver。
然而，我们往往会在项目中加入commons-fileupload依赖，加载的是CommonsMultipartResolver。此时同时使用两个，会产生冲突。

解决方案
1、使用SpringBoot 默认的StandardServletMultipartResolver，不依赖commons-fileupload。
2、使用commons-fileupload的CommonsMultipartResolver，
排除默认

spring:autoconfigure:exclude: org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration

自定义文件解析对象

@Bean(name = "multipartResolver")public MultipartResolver multipartResolver() {CommonsMultipartResolver resolver = new CommonsMultipartResolver(); resolver.setDefaultEncoding("UTF-8"); return resolver; }

以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。