如何在运行时替换spring内部bean

Question

我想在运行时替换StandardServletMultipartResolver 配置。为此，我想替换 MultipartConfigElement bean。

其实我想改变MultipartProperties里面的值

我试图用谷歌搜索这个问题，但我只看到了这个主题：

Replace a bean inside the spring container during run-time

但是这个方法只适用于我的豆子。我不明白如何将其应用于我的案例。

我在代码 spring 源代码中找到了 spring 如何创建这些 bean：

@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
    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;
    }

}

我想写这样的东西：

multipartProperties = ...
applicationContext.putBean(multipartProperties.createMultipartConfig())

如何在上下文中替换 bean？

Answer 1

You try to add-commons-fileupload.jar to pom.xml 


<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.2</version>

在 WebConfig 中：

@豆 公共 CommonsMultipartResolver multipartResolver() {

    CommonsMultipartResolver cmr = new CommonsMultipartResolver();
    cmr.setMaxUploadSize(maxUploadSizeInMb * 2);
    cmr.setMaxUploadSizePerFile(maxUploadSizeInMb); //bytes
    return cmr;

}