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1
17 package org.ajaxanywhere;
18
19 import javax.servlet.*;
20 import javax.servlet.http.HttpServletRequest  ;
21 import javax.servlet.http.HttpServletResponse ;
22 import java.io.IOException ;
23 import java.util.HashSet ;
24 import java.util.Set ;
25 import java.util.Map ;
26 import java.util.List ;
27
28
32 public class AAFilter implements Filter {
33
34 public String preSendHandlerClassName;
35
36 public void init(FilterConfig filterConfig) throws ServletException {
37 preSendHandlerClassName = filterConfig.getInitParameter("preSendHandlerClass");
38 }
39
40 public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException , ServletException {
41
42 HttpServletRequest request = (HttpServletRequest ) servletRequest;
43 HttpServletResponse response = (HttpServletResponse ) servletResponse;
44
45 if (!AAUtils.isAjaxRequest(servletRequest)) {
46 filterChain.doFilter(servletRequest, response);
47 return;
48 }
49
50
51 request.setCharacterEncoding("UTF-8");
52 response.setContentType("text/xml;charset=utf-8");
53
54 response.setHeader("Cache-Control", "no-cache");
55 response.setDateHeader("Expires", 0);
56 response.setHeader("Pragma", "no-cache");
57
58 BufferResponseWrapper bufferResponseWrapper = new BufferResponseWrapper(response);
59
60 Set refreshZones = new HashSet ();
61 AAUtils.setZonesToRefresh(request, refreshZones);
62 AAUtils.getRefreshZonesFromURL(request);
63
64 try {
65 filterChain.doFilter(request, bufferResponseWrapper);
66
67 bufferResponseWrapper = execHandler(request,bufferResponseWrapper);
68
69 if (bufferResponseWrapper.getRedirect() != null) {
70 XMLHandler.sendRedirect(bufferResponseWrapper);
71 } else {
72 XMLHandler.sendZones(bufferResponseWrapper, refreshZones);
73 }
74 }
75
76 catch (Throwable e) {
77 XMLHandler.handleError(response, e);
78 }
79
80 }
81
82 private BufferResponseWrapper execHandler(HttpServletRequest request, BufferResponseWrapper bufferResponseWrapper) throws ClassNotFoundException , IllegalAccessException , InstantiationException {
83 if (preSendHandlerClassName!=null){
84 Class hClass;
85 try {
86 hClass = Thread.currentThread().getContextClassLoader().loadClass(preSendHandlerClassName);
87 } catch (ClassNotFoundException e) {
88 hClass = Class.forName(preSendHandlerClassName);
89 e.printStackTrace();
90 }
91 PreSendHandler handler = (PreSendHandler) hClass.newInstance();
92 return handler.handle(request, bufferResponseWrapper);
93 }
94 return bufferResponseWrapper;
95 }
96
97
98 public void destroy() {
99 }
100 }
101 |
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Java API By Example, From Geeks To Geeks.