Class StandardServletMultipartResolver

All Implemented Interfaces:

public class StandardServletMultipartResolver extends Object implements MultipartResolver
Standard implementation of the MultipartResolver interface, based on the Servlet Part API. To be added as "multipartResolver" bean to a Spring DispatcherServlet context, without any extra configuration at the bean level (see below).

This resolver variant uses your Servlet container's multipart parser as-is, potentially exposing the application to container implementation differences. Also, see this resolver's configuration option for strict Servlet compliance, narrowing the applicability of Spring's MultipartHttpServletRequest to form data only.

Note: In order to use Servlet container based multipart parsing, you need to mark the affected servlet with a "multipart-config" section in web.xml, or with a MultipartConfigElement in programmatic servlet registration, or (in case of a custom servlet class) possibly with a MultipartConfig annotation on your servlet class. Configuration settings such as maximum sizes or storage locations need to be applied at that servlet registration level; a Servlet container does not allow for them to be set at the MultipartResolver level.

 public class AppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
   // ...
   protected void customizeRegistration(ServletRegistration.Dynamic registration) {
     // Optionally also set maxFileSize, maxRequestSize, fileSizeThreshold
     registration.setMultipartConfig(new MultipartConfigElement("/tmp"));
Juergen Hoeller
See Also:
  • Constructor Details

    • StandardServletMultipartResolver

      public StandardServletMultipartResolver()
  • Method Details

    • setResolveLazily

      public void setResolveLazily(boolean resolveLazily)
      Set whether to resolve the multipart request lazily at the time of file or parameter access.

      Default is "false", resolving the multipart elements immediately, throwing corresponding exceptions at the time of the resolveMultipart(jakarta.servlet.http.HttpServletRequest) call. Switch this to "true" for lazy multipart parsing, throwing parse exceptions once the application attempts to obtain multipart files or parameters.

    • setStrictServletCompliance

      public void setStrictServletCompliance(boolean strictServletCompliance)
      Specify whether this resolver should strictly comply with the Servlet specification, only kicking in for "multipart/form-data" requests.

      Default is "false", trying to process any request with a "multipart/" content type as far as the underlying Servlet container supports it (which works on e.g. Tomcat but not on Jetty). For consistent portability and in particular for consistent custom handling of non-form multipart request types outside of Spring's MultipartResolver mechanism, switch this flag to "true": Only "multipart/form-data" requests will be wrapped with a MultipartHttpServletRequest then; other kinds of requests will be left as-is, allowing for custom processing in user code.

    • isMultipart

      public boolean isMultipart(HttpServletRequest request)
      Description copied from interface: MultipartResolver
      Determine if the given request contains multipart content.

      Will typically check for content type "multipart/form-data", but the actually accepted requests might depend on the capabilities of the resolver implementation.

      Specified by:
      isMultipart in interface MultipartResolver
      request - the servlet request to be evaluated
      whether the request contains multipart content
    • resolveMultipart

      public MultipartHttpServletRequest resolveMultipart(HttpServletRequest request) throws MultipartException
      Description copied from interface: MultipartResolver
      Parse the given HTTP request into multipart files and parameters, and wrap the request inside a MultipartHttpServletRequest object that provides access to file descriptors and makes contained parameters accessible via the standard ServletRequest methods.
      Specified by:
      resolveMultipart in interface MultipartResolver
      request - the servlet request to wrap (must be of a multipart content type)
      the wrapped servlet request
      MultipartException - if the servlet request is not multipart, or if implementation-specific problems are encountered (such as exceeding file size limits)
      See Also:
    • cleanupMultipart

      public void cleanupMultipart(MultipartHttpServletRequest request)
      Description copied from interface: MultipartResolver
      Clean up any resources used for the multipart handling, like a storage for the uploaded files.
      Specified by:
      cleanupMultipart in interface MultipartResolver
      request - the request to clean up resources for