如何在 Spring Boot 中使用 CommonsMultipartResolver

Question

我曾尝试在 Boot 中使用 CommonsMultipartResolver 将我的旧应用程序 (WAR) 转换为 Boot，现在它得到了以下代码：

@Configuration
    public class TestConfig {

        @Bean
        public FilterRegistrationBean openEntityManagerFilterRegistrationBean() {
            // Set upload filter
            final MultipartFilter multipartFilter = new MultipartFilter();
            final FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(multipartFilter);
            filterRegistrationBean.addInitParameter("multipartResolverBeanName", "commonsMultipartResolver");

            return filterRegistrationBean;
        }

        @Bean
        public CommonsMultipartResolver commonsMultipartResolver() {
            final CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver();
            commonsMultipartResolver.setMaxUploadSize(-1);

            return commonsMultipartResolver;
        }
    }

这是在 Boot 中正确的方式吗，因为我看到一些属性要在 application.properties 中应用。它们与定义 FilterRegistrationBean 的目的是否相同？

# MULTIPART (MultipartProperties)
multipart.enabled=true
multipart.file-size-threshold=0 # Threshold after which files will be written to disk.
multipart.location= # Intermediate location of uploaded files.
multipart.max-file-size=1Mb # Max file size.
multipart.max-request-size=10Mb # Max request size.

谁能提供任何示例如何使用它？谢谢。

顺便说一句，它试图设置属性“multipart.enabled=true”，我得到了：

Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'enabled' of bean class [org.springframework.boot.autoconfigure.web.MultipartProperties]: Bean property 'enabled' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
    at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:1076)
    at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:927)
    at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:95)
    at org.springframework.validation.DataBinder.applyPropertyValues(DataBinder.java:749)
    at org.springframework.validation.DataBinder.doBind(DataBinder.java:645)
    at org.springframework.boot.bind.RelaxedDataBinder.doBind(RelaxedDataBinder.java:121)
    at org.springframework.validation.DataBinder.bind(DataBinder.java:630)
    at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:253)
    at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:227)
    at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:296)
    ... 73 common frames omitted

Answer 1

如果你想使用CommonsMultipartFile上传文件，请在你的spring boot项目中添加@EnableAutoConfiguration(exclude = {MultipartAutoConfiguration.class})。在spring boot中禁用多部分配置。

   public RespDataView provisionalMediaUpload(@RequestParam("file") CommonsMultipartFile file,
                                               @RequestParam("type") String type) {}

Answer 2

这是 Spring Boot 中的 bug，将在 1.2.5 中修复。

Answer 3

首先，org.springframework.boot.autoconfigure.web.MultipartProperties 类中没有 enabled 属性。

参考https://github.com/spring-projects/spring-boot/blob/master/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/MultipartProperties.java

如果您使用的是 Servlet 3 容器，则无需使用 commons-fileupload 机制，并且默认启用 Multipart 支持。如果您不想自定义任何多部分默认配置，则也无需在 application.properties 中添加任何配置。

<form method="post" action="upload" enctype="multipart/form-data">
  File: <input type="file" name="file"/>
  <input type="submit" value="Submit"/>
</form>

@RequestMapping(value="/upload", method=RequestMethod.POST)
public String upload(@RequestPart("file") MultipartFile multipartFile)
{
    System.out.println(multipartFile.getOriginalFilename());
    return "redirect:/";
}

如果你想使用 commons-fileupload，那么添加以下配置就可以了：

package demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.multipart.support.MultipartFilter;

@SpringBootApplication
public class BootDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(BootDemoApplication.class, args);
    }

    @Bean
    public CommonsMultipartResolver commonsMultipartResolver() {
        final CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver();
        commonsMultipartResolver.setMaxUploadSize(-1);
        return commonsMultipartResolver;
    }

    @Bean
    public FilterRegistrationBean multipartFilterRegistrationBean() {
        final MultipartFilter multipartFilter = new MultipartFilter();
        final FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(multipartFilter);
        filterRegistrationBean.addInitParameter("multipartResolverBeanName", "commonsMultipartResolver");
        return filterRegistrationBean;
    }
}

当然我们需要添加 commons-fileupload 依赖。

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>