SpringBoot上传文件报错，使用MultipartHttpServletRequest

项目从springMVC升级到springBoot之后，原来上传文件的功能用不了了，抛了一个MethodArgumentConversionNotSupportedException异常：

org.springframework.web.method.annotation.MethodArgumentConversionNotSupportedException: Failed to convert value of type ‘org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile’ to required type ‘org.springframework.web.multipart.commons.CommonsMultipartFile’

1.为了解决这个问题，我们要把注册一个新的文件解析器multipartResolver：

@Configuration
public class BaseConfig {

    @Bean(name = "multipartResolver")
    public MultipartResolver multipartResolver(){
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
        resolver.setDefaultEncoding("UTF-8");
        resolver.setResolveLazily(true);//resolveLazily属性启用是为了推迟文件解析，以在在UploadAction中捕获文件大小异常
        resolver.setMaxInMemorySize(40960);
        resolver.setMaxUploadSize(50*1024*1024);//上传文件大小 50M 50*1024*1024
        return resolver;
    }

}

2.同时在application.properties加上：
spring.http.multipart.enabled=true
3.然后在启动本项目的Application.java上面声明：
@EnableAutoConfiguration(exclude = {MultipartAutoConfiguration.class})

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
@EnableAutoConfiguration(exclude = {MultipartAutoConfiguration.class})
@EnableAsync
@ServletComponentScan
@EnableScheduling
public class Application extends WebMvcConfigurationSupport {

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


@Override
public void addInterceptors(InterceptorRegistry registry){
	AuthorizationInterceptor authorizationInterceptor = new AuthorizationInterceptor();
	registry.addInterceptor(authorizationInterceptor);
	super.addInterceptors(registry);
}

}

4.然后在Controller接口上通过 @RequestParam(“excel”) MultipartFile excel来接收文件上传请求就好
@RequestMapping(value = “/import”,method = RequestMethod.POST)
public void upload( @RequestParam(“excel”) MultipartFile excel){
System.out.println(“success”);
}