Package org.springframework.web.context.request

Interface WebRequest

All Superinterfaces:
RequestAttributes
All Known Subinterfaces:
AsyncWebRequest, NativeWebRequest
All Known Implementing Classes:
DispatcherServletWebRequest, FacesWebRequest, ServletWebRequest, StandardServletAsyncWebRequest
public interface WebRequest extends RequestAttributes
Generic interface for a web request. Mainly intended for generic web request interceptors, giving them access to general request metadata, not for actual handling of the request.
Since:
2.0
Author:
Juergen Hoeller, Brian Clozel
See Also:

  • Method Details

    • getHeader

      @Nullable String getHeader(String headerName)
      Return the request header of the given name, or null if none.

      Retrieves the first header value in case of a multi-value header.

      Since:
      3.0
      See Also:

    • getHeaderValues

      @Nullable String[] getHeaderValues(String headerName)
      Return the request header values for the given header name, or null if none.

      A single-value header will be exposed as an array with a single element.

      Since:
      3.0
      See Also:

    • getHeaderNames

      Iterator<String> getHeaderNames()
      Return a Iterator over request header names.
      Since:
      3.0
      See Also:

    • getParameter

      @Nullable String getParameter(String paramName)
      Return the request parameter of the given name, or null if none.

      Retrieves the first parameter value in case of a multi-value parameter.

      See Also:

    • getParameterValues

      @Nullable String[] getParameterValues(String paramName)
      Return the request parameter values for the given parameter name, or null if none.

      A single-value parameter will be exposed as an array with a single element.

      See Also:

    • getParameterNames

      Iterator<String> getParameterNames()
      Return a Iterator over request parameter names.
      Since:
      3.0
      See Also:

    • getParameterMap

      Map<String,String[]> getParameterMap()
      Return a immutable Map of the request parameters, with parameter names as map keys and parameter values as map values. The map values will be of type String array.

      A single-value parameter will be exposed as an array with a single element.

      See Also:

    • getLocale

      Locale getLocale()
      Return the primary Locale for this request.
      See Also:

    • getContextPath

      String getContextPath()
      Return the context path for this request (usually the base path that the current web application is mapped to).
      See Also:

    • getRemoteUser

      @Nullable String getRemoteUser()
      Return the remote user for this request, if any.
      See Also:

    • getUserPrincipal

      @Nullable Principal getUserPrincipal()
      Return the user principal for this request, if any.
      See Also:

    • isUserInRole

      boolean isUserInRole(String role)
      Determine whether the user is in the given role for this request.
      See Also:

    • isSecure

      boolean isSecure()
      Return whether this request has been sent over a secure transport mechanism (such as SSL).
      See Also:

    • checkNotModified

      boolean checkNotModified(long lastModifiedTimestamp)
      Check whether the requested resource has been modified given the supplied last-modified timestamp (as determined by the application).

      This will also transparently set the "Last-Modified" response header and HTTP status when applicable.

      Typical usage: 

       public String myHandleMethod(WebRequest request, Model model) {
   long lastModified = // application-specific calculation
   if (request.checkNotModified(lastModified)) {
     // shortcut exit - no further processing necessary
     return null;
   }
   // further request processing, actually building content
   model.addAttribute(...);
   return "myViewName";
 }

      This method works with conditional GET/HEAD requests, but also with conditional POST/PUT/DELETE requests.

      Note: you can use either this #checkNotModified(long) method; or checkNotModified(String). If you want enforce both a strong entity tag and a Last-Modified value, as recommended by the HTTP specification, then you should use checkNotModified(String, long).

      If the "If-Modified-Since" header is set but cannot be parsed to a date value, this method will ignore the header and proceed with setting the last-modified timestamp on the response.

      Parameters:
      lastModifiedTimestamp - the last-modified timestamp in milliseconds that the application determined for the underlying resource
      Returns:
      whether the request qualifies as not modified, allowing to abort request processing and relying on the response telling the client that the content has not been modified

    • checkNotModified

      boolean checkNotModified(String etag)
      Check whether the requested resource has been modified given the supplied ETag (entity tag), as determined by the application.

      This will also transparently set the "ETag" response header and HTTP status when applicable.

      Typical usage: 

       public String myHandleMethod(WebRequest request, Model model) {
   String eTag = // application-specific calculation
   if (request.checkNotModified(eTag)) {
     // shortcut exit - no further processing necessary
     return null;
   }
   // further request processing, actually building content
   model.addAttribute(...);
   return "myViewName";
 }

      Note: you can use either this #checkNotModified(String) method; or checkNotModified(long). If you want enforce both a strong entity tag and a Last-Modified value, as recommended by the HTTP specification, then you should use checkNotModified(String, long).

      Parameters:
      etag - the entity tag that the application determined for the underlying resource. This parameter will be padded with quotes (") if necessary.
      Returns:
      true if the request does not require further processing.

    • checkNotModified

      boolean checkNotModified(@Nullable String etag, long lastModifiedTimestamp)
      Check whether the requested resource has been modified given the supplied ETag (entity tag) and last-modified timestamp, as determined by the application.

      This will also transparently set the "ETag" and "Last-Modified" response headers, and HTTP status when applicable.

      Typical usage: 

       public String myHandleMethod(WebRequest request, Model model) {
   String eTag = // application-specific calculation
   long lastModified = // application-specific calculation
   if (request.checkNotModified(eTag, lastModified)) {
     // shortcut exit - no further processing necessary
     return null;
   }
   // further request processing, actually building content
   model.addAttribute(...);
   return "myViewName";
 }

      This method works with conditional GET/HEAD requests, but also with conditional POST/PUT/DELETE requests.

      Note: The HTTP specification recommends setting both ETag and Last-Modified values, but you can also use #checkNotModified(String) or checkNotModified(long).

      Parameters:
      etag - the entity tag that the application determined for the underlying resource. This parameter will be padded with quotes (") if necessary.
      lastModifiedTimestamp - the last-modified timestamp in milliseconds that the application determined for the underlying resource
      Returns:
      true if the request does not require further processing.
      Since:
      4.2

    • getDescription

      String getDescription(boolean includeClientInfo)
      Get a short description of this request, typically containing request URI and session id.
      Parameters:
      includeClientInfo - whether to include client-specific information such as session id and user name
      Returns:
      the requested description as String