SpringBoot中的multipartResolver上傳文件配置

更新時(shí)間：2021年10月26日 09:32:55 作者：閆-先生

這篇文章主要介紹了SpringBoot中的multipartResolver上傳文件配置，具有很好的參考價(jià)值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

multipartResolver上傳文件配置

1、gradle配置

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

2、注冊Bean

    @Bean(name = "multipartResolver")
    public MultipartResolver multipartResolver(){
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
        resolver.setDefaultEncoding("UTF-8");
        //resolveLazily屬性啟用是為了推遲文件解析，以在在UploadAction中捕獲文件大小異常
        resolver.setResolveLazily(true);
        resolver.setMaxInMemorySize(40960);
        //上傳文件大小 50M 50*1024*1024
        resolver.setMaxUploadSize(50*1024*1024);
        return resolver;
    }

SpringBoot MultipartResolver的坑

在使用springBoot上傳文件的時(shí)候，我們會用到MultipartResolver。我看通過源碼可以看到

@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配置類，默認(rèn)加載的是StandardServletMultipartResolver。

然而，我們往往會在項(xiàng)目中加入commons-fileupload依賴，加載的是CommonsMultipartResolver。此時(shí)同時(shí)使用兩個(gè)，會產(chǎn)生沖突。

解決方案

1、使用SpringBoot 默認(rèn)的StandardServletMultipartResolver，不依賴commons-fileupload。

2、使用commons-fileupload的CommonsMultipartResolver，

排除默認(rèn)

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

自定義文件解析對象

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

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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