springmvc框架切换为Springboot，原文件上传模块报转换异常

在Application中加入以下代码

    @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;  
    } 

并且在类上加上配置@EnableAutoConfiguration(exclude = {MultipartAutoConfiguration.class})