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1   /*
2    * JBoss, Home of Professional Open Source
3    * Copyright 2014, Red Hat, Inc. and/or its affiliates, and individual
4    * contributors by the @authors tag. See the copyright.txt in the
5    * distribution for a full listing of individual contributors.
6    *
7    * Licensed under the Apache License, Version 2.0 (the "License");
8    * you may not use this file except in compliance with the License.
9    * You may obtain a copy of the License at
10   * http://www.apache.org/licenses/LICENSE-2.0
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.jboss.as.quickstarts.servlet.filterlistener;
18  
19  import java.util.Map;
20  
21  import javax.servlet.ServletContext;
22  import javax.servlet.ServletRequestEvent;
23  import javax.servlet.ServletRequestListener;
24  import javax.servlet.annotation.WebListener;
25  
26  /**
27   * A simple request listener that dumps all the parameters of the HTTP requests.
28   * <p>
29   * Because Request Listeners see requests before Filters see them, this listener sees the original parameter values as sent by
30   * the user rather than the modified ones passed down the filter chain by {@link VowelRemoverFilter}.
31   * 
32   * @author Jonathan Fuerth <jfuerth@redhat.com>
33   */
34  @WebListener
35  public class ParameterDumpingRequestListener implements ServletRequestListener {
36  
37      @Override
38      public void requestInitialized(ServletRequestEvent sre) {
39          Map<String, String[]> paramMap = sre.getServletRequest().getParameterMap();
40          ServletContext servletContext = sre.getServletContext();
41  
42          // to see log messages at runtime, check the terminal window where you started JBoss AS.
43          servletContext.log("ParameterDumpingRequestListener: request has been initialized. It has " + paramMap.size()
44                  + " parameters:");
45          for (Map.Entry<String, String[]> entry : paramMap.entrySet()) {
46              for (String val : entry.getValue()) {
47                  servletContext.log("  " + entry.getKey() + "=" + val);
48              }
49          }
50      }
51  
52      @Override
53      public void requestDestroyed(ServletRequestEvent sre) {
54          sre.getServletContext().log("ParameterDumpingRequestListener: request has been destroyed");
55      }
56  
57  }