org.springframework.web.filter.RequestContextFilter Maven / Gradle / Ivy
/*
* Copyright 2002-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.filter;
import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
/**
* Servlet 2.3+ filter that exposes the request to the current thread,
* through both {@link org.springframework.context.i18n.LocaleContextHolder} and
* {@link RequestContextHolder}. To be registered as filter in web.xml.
*
* Alternatively, Spring's {@link org.springframework.web.context.request.RequestContextListener}
* and Spring's {@link org.springframework.web.servlet.DispatcherServlet} also expose
* the same request context to the current thread.
*
*
This filter is mainly for use with third-party servlets, e.g. the JSF FacesServlet.
* Within Spring's own web support, DispatcherServlet's processing is perfectly sufficient.
*
* @author Juergen Hoeller
* @author Rod Johnson
* @since 2.0
* @see org.springframework.context.i18n.LocaleContextHolder
* @see org.springframework.web.context.request.RequestContextHolder
* @see org.springframework.web.context.request.RequestContextListener
* @see org.springframework.web.servlet.DispatcherServlet
*/
public class RequestContextFilter extends OncePerRequestFilter {
protected void doFilterInternal(
HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
ServletRequestAttributes attributes = new ServletRequestAttributes(request);
LocaleContextHolder.setLocale(request.getLocale());
RequestContextHolder.setRequestAttributes(attributes);
if (logger.isDebugEnabled()) {
logger.debug("Bound request context to thread: " + request);
}
try {
filterChain.doFilter(request, response);
}
finally {
RequestContextHolder.setRequestAttributes(null);
LocaleContextHolder.setLocale(null);
attributes.requestCompleted();
if (logger.isDebugEnabled()) {
logger.debug("Cleared thread-bound request context: " + request);
}
}
}
}