springboot文件上传 Required request part ‘file’ is not present

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springboot文件上传

如果报错如下:

The field file exceeds its maximum permitted size of 1048576 bytes.

或者如下:



Required request part ‘file’ is not present


上面的报错可能是因为spring boot 内置的MultipartResolver有点问题,可以这样解决:


1、显性注册MultipartResolver:

// 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(10 * 1024 * 1024);// 上传文件大小 5M 5*1024*1024  
        return resolver;  
    }  

2、并且在spring boot的启动类添加注解:

@EnableAutoConfiguration(exclude = {MultipartAutoConfiguration.class})  

这个注解的意思是排除内置的MultipartResolver。如果没有这个注解,显性注册的MultipartResolver会无效。这样处理以后就能正常上传了



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