How to restrict file types being uploaded to Spring MVC3 Controller

Question

I am using Spring MVC3 to handle file upload for my web application. For now, I can restrict the file size being uploaded using the following configuration defined in my xml context file:

<beans:bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <beans:property name="maxUploadSize" value="200000"/> 
</beans:bean>

I have scoured the web for how to restrict the file type but to no avail. Most of the articles I found only teach how to restrict the file size not the file type. Thank in advance for your help.

Answer 1

Try performing the check/routing in your controller's request handler method:

@RequestMapping("/save")
public String saveSkill(@RequestParam(value = "file", required = false) MultipartFile file) {   
        if(!file.getContentType().equalsIgnoreCase("text/html")){
            return "normalProcessing";
        }else{
            return "redirect: /some/page";
        }
}

Answer 2

You restrict file uploading by file types, you can extend org.springframework.web.multipart.commons.CommonsMultipartResolver class. And add method to check file content-type or file type using MultipartFile.

Provide file types , those you want to restrict in configuration like -

 <beans:bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <beans:property name="maxUploadSize" value="200000"/> 
    <beans:property name="restrictFileTypes" value="html,pdf,..."/> 
</beans:bean>