SpringBoot中的multipartResolver上传文件配置

SpringBoot中的multipartResolver上传文件配置

目录multipartResolver上传文件配置1、gradle配置2、注册BeanSpringBoot MultipartResolver的坑解决方案

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*1024

resolver.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, StandardServletTFMRCjxWMultipartResolver.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,

CommonsMultipartResolTFMRCjxWver.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.MultipartAutoConfigurathttp://ion

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;

}

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