Come utilizzare CommonsMultipartResolver nella primavera del Boot

Question

ho cercato di utilizzare CommonsMultipartResolver in Boot tradurre la mia vecchia applicazione (WAR) per l'avvio, e in questo momento ha ottenuto il seguente codice:

@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; 
     } 
    } 

E 'questo il modo giusto in Avvio, perché ho visto alcune proprietà da applicare in application.properties. Sarebbero lo stesso scopo che definire un FilterRegistrationBean?

# 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. 

Qualcuno può fornire qualche esempio su come utilizzarlo? Grazie.

Tra l'altro, ha cercato di impostare la proprietà "multipart.enabled = true" e ho ottenuto:

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

Questo è stato un bug nella primavera del boot e sarà fissato in 1.2.5.

Answer 2

In primo luogo, non v'è alcuna abilitato proprietà in org.springframework.boot.autoconfigure.web.MultipartProperties di classe.

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

Se si utilizza servlet container 3 non avete bisogno di usare il meccanismo commons-fileupload e supporto Multipart è abilitato di default. Se non si desidera personalizzare alcuna configurazione predefinita multipart non è necessario aggiungere alcuna configurazione in application.properties.

<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:/"; 
} 

Se si desidera utilizzare commons-fileupload poi aggiungendo seguente configurazione sta funzionando bene:

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; 
    } 
} 

E, naturalmente, abbiamo bisogno di aggiungere commons-fileupload dipendenza.

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