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:

WebRequestInterceptor

Field Summary

Fields inherited from interface org.springframework.web.context.request.RequestAttributes

REFERENCE_REQUEST, REFERENCE_SESSION, SCOPE_REQUEST, SCOPE_SESSION

Method Summary

Modifier and Type	Method and Description
boolean	checkNotModified(long lastModifiedTimestamp) Check whether the requested resource has been modified given the supplied last-modified timestamp (as determined by the application).
boolean	checkNotModified(String etag) Check whether the requested resource has been modified given the supplied ETag (entity tag), as determined by the application.
boolean	checkNotModified(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.
String	getContextPath() Return the context path for this request (usually the base path that the current web application is mapped to).
String	getDescription(boolean includeClientInfo) Get a short description of this request, typically containing request URI and session id.
String	getHeader(String headerName) Return the request header of the given name, or null if none.
Iterator<String>	getHeaderNames() Return a Iterator over request header names.
String[]	getHeaderValues(String headerName) Return the request header values for the given header name, or null if none.
Locale	getLocale() Return the primary Locale for this request.
String	getParameter(String paramName) Return the request parameter of the given name, or null if none.
Map<String,String[]>	getParameterMap() Return a immutable Map of the request parameters, with parameter names as map keys and parameter values as map values.
Iterator<String>	getParameterNames() Return a Iterator over request parameter names.
String[]	getParameterValues(String paramName) Return the request parameter values for the given parameter name, or null if none.
String	getRemoteUser() Return the remote user for this request, if any.
Principal	getUserPrincipal() Return the user principal for this request, if any.
boolean	isSecure() Return whether this request has been sent over a secure transport mechanism (such as SSL).
boolean	isUserInRole(String role) Determine whether the user is in the given role for this request.

Methods inherited from interface org.springframework.web.context.request.RequestAttributes

getAttribute, getAttributeNames, getSessionId, getSessionMutex, registerDestructionCallback, removeAttribute, resolveReference, setAttribute

Method Detail

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:

HttpServletRequest.getHeader(String)

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:

HttpServletRequest.getHeaders(String)

getHeaderNames

Iterator<String> getHeaderNames()

Return a Iterator over request header names.

Since:

3.0

See Also:

HttpServletRequest.getHeaderNames()

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:

ServletRequest.getParameter(String)

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:

ServletRequest.getParameterValues(String)

getParameterNames

Iterator<String> getParameterNames()

Return a Iterator over request parameter names.

Since:

3.0

See Also:

ServletRequest.getParameterNames()

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:

ServletRequest.getParameterMap()

getLocale

Locale getLocale()

Return the primary Locale for this request.

See Also:

ServletRequest.getLocale()

getContextPath

String getContextPath()

Return the context path for this request (usually the base path that the current web application is mapped to).

See Also:

HttpServletRequest.getContextPath()

getRemoteUser

@Nullable
String getRemoteUser()

Return the remote user for this request, if any.

See Also:

HttpServletRequest.getRemoteUser()

getUserPrincipal

@Nullable
Principal getUserPrincipal()

Return the user principal for this request, if any.

See Also:

HttpServletRequest.getUserPrincipal()

isUserInRole

boolean isUserInRole(String role)

Determine whether the user is in the given role for this request.

See Also:

HttpServletRequest.isUserInRole(String)

isSecure

boolean isSecure()

Return whether this request has been sent over a secure transport mechanism (such as SSL).

See Also:

ServletRequest.isSecure()

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 webRequest, 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 webRequest, 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 webRequest, 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