spring boot MultipartFile[]文件上传

之前用spring MVC，转成spring boot之后发现上传不能用。网上参考说是spring boot已经有CommonsMultipartResolver了，但是我的上传后台接收的还是null。

后来参考https://segmentfault/q/1010000004657605 发现，还需要在Application里加些配置。

@SpringBootApplication
@Configuration
@EnableAutoConfiguration(exclude = {MultipartAutoConfiguration.class})
@ImportResource("classpath:txAdvice.xml")
public class Application {

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

    //显示声明CommonsMultipartResolver为mutipartResolver
    @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(5 * 1024 * 1024);//上传文件大小 5M 5*1024*1024
        return resolver;
    }


}