如何使用是CommonsMultipartResolver在春季啓動

Question

我曾嘗試使用是CommonsMultipartResolver在引導翻譯我的舊應用程序（WAR）來引導，而現在它得到了下面的代碼：

@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; 
     } 
    } 

這是在正確的道路啓動，導致我看到一些屬性在application.properties中應用。它們與定義FilterRegistrationBean的目的相同嗎？

# 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. 

任何人都可以提供任何示例如何使用它？謝謝。

順便說一句，它試圖設置屬性「multipart.enabled =真正的」和我：

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

這是Spring Boot中的bug，將在1.2.5中修復。

Answer 2

首先，沒有啓用財產org.springframework.boot.autoconfigure.web.MultipartProperties類。

如果您正在使用的Servlet容器3，你沒有必要使用公地文件上傳機制和多支持，默認情況下啓用參考https://github.com/spring-projects/spring-boot/blob/master/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/MultipartProperties.java

。如果您不想自定義任何多部分默認配置，則無需在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-文件上傳，然後添加下面的配置工作正常：

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; 
    } 
} 

當然，我們需要添加的commons-文件上傳的依賴。

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