How to pass a MultipartHttpServletRequest? - spring

Question

Before posting this, I searched on stack overflow and did the applicable answer. I tried putting enctype on my form tag,
<form name="something" method="post" enctype="multipart/form-data">
adding MultipartResolver on my bean,
<bean id="spring.RegularCommonsMultipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
but none of these solved my problem.
I want a method that accepts MultipartHttpServletRequest as the parameter. But the browser console gives me this error:
POST link.json 500 Internal Server Error
Eclipse on the other hand throws this error:
Servlet.service() for servlet [action] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: Current request is not of type [org.springframework.web.multipart.MultipartHttpServletRequest]
My controller code looks like this:
#RequestMapping("myjson/myLink")
public void myMethod(MultipartHttpServletRequest request)
{
}
My code accepts HttpServletRequest and not MultipartHttpServletRequest. Is there other way to this?
I badly need MultipartHttpServletRequest because of its getFile method. I need to get an image from the client and store it on the server.

Answer 1

This will surely work for you.
HTML:
<form action="myjson/myLink" id="fileForm" method="POST" enctype="multipart/form-data">
<input type="file" name="File"/>
</form>
Controller:
#RequestMapping(value = "/myjson/myLink", method = RequestMethod.POST)
public #ResponseBody String SaveFile(HttpServletRequest request, #RequestParam("File") MultipartFile file) {
if(!file.isEmpty())
{
try
{
File convFile = new File(//here file location+filename);
convFile.createNewFile();
FileOutputStream fos = new FileOutputStream(convFile);
fos.write( file.getBytes() );
fos.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
Spring Configuration:
<bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver"/>
and in your Spring Initializer class Define MultipartConfigElement element
public class SpringInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
#Override
protected Class<?>[] getRootConfigClasses() {
return new Class[] { SpringConfiguration.class};
}
#Override
protected Class<?>[] getServletConfigClasses() {
return null;
}
#Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
#Override
protected void customizeRegistration(ServletRegistration.Dynamic registration) {
registration.setMultipartConfig(getMultipartConfigElement());
}
private MultipartConfigElement getMultipartConfigElement() {
MultipartConfigElement multipartConfigElement = new MultipartConfigElement( LOCATION, MAX_FILE_SIZE, MAX_REQUEST_SIZE, FILE_SIZE_THRESHOLD);
return multipartConfigElement;
}
private static final String LOCATION = System.getenv("TEMP").replace('\\', '/') + "/"; // Temporary location where files will be stored
private static final long MAX_FILE_SIZE = 5242880; // 5MB : Max file size.
// Beyond that size spring will throw exception.
private static final long MAX_REQUEST_SIZE = 20971520; // 20MB : Total request size containing Multi part.
private static final int FILE_SIZE_THRESHOLD = 0; // Size threshold after which files will be written to disk
}