RequestDumperFilterpublic final class RequestDumperFilter extends Object implements FilterExample filter that dumps interesting state information about a request
to the associated servlet context log file, before allowing the servlet
to process the request in the usual way. This can be installed as needed
to assist in debugging problems. |
Fields Summary |
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private FilterConfig | filterConfigThe filter configuration object we are associated with. If this value
is null, this filter instance is not currently configured. |
Methods Summary |
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public void | destroy()Take this filter out of service.
// --------------------------------------------------------- Public Methods
this.filterConfig = null;
| public void | doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain)Time the processing that is performed by all subsequent filters in the
current filter stack, including the ultimately invoked servlet.
if (filterConfig == null)
return;
// Render the generic servlet request properties
StringWriter sw = new StringWriter();
PrintWriter writer = new PrintWriter(sw);
writer.println("Request Received at " +
(new Timestamp(System.currentTimeMillis())));
writer.println(" characterEncoding=" + request.getCharacterEncoding());
writer.println(" contentLength=" + request.getContentLength());
writer.println(" contentType=" + request.getContentType());
writer.println(" locale=" + request.getLocale());
writer.print(" locales=");
Enumeration locales = request.getLocales();
boolean first = true;
while (locales.hasMoreElements()) {
Locale locale = (Locale) locales.nextElement();
if (first)
first = false;
else
writer.print(", ");
writer.print(locale.toString());
}
writer.println();
Enumeration names = request.getParameterNames();
while (names.hasMoreElements()) {
String name = (String) names.nextElement();
writer.print(" parameter=" + name + "=");
String values[] = request.getParameterValues(name);
for (int i = 0; i < values.length; i++) {
if (i > 0)
writer.print(", ");
writer.print(values[i]);
}
writer.println();
}
writer.println(" protocol=" + request.getProtocol());
writer.println(" remoteAddr=" + request.getRemoteAddr());
writer.println(" remoteHost=" + request.getRemoteHost());
writer.println(" scheme=" + request.getScheme());
writer.println(" serverName=" + request.getServerName());
writer.println(" serverPort=" + request.getServerPort());
writer.println(" isSecure=" + request.isSecure());
// Render the HTTP servlet request properties
if (request instanceof HttpServletRequest) {
writer.println("---------------------------------------------");
HttpServletRequest hrequest = (HttpServletRequest) request;
writer.println(" contextPath=" + hrequest.getContextPath());
Cookie cookies[] = hrequest.getCookies();
if (cookies == null)
cookies = new Cookie[0];
for (int i = 0; i < cookies.length; i++) {
writer.println(" cookie=" + cookies[i].getName() +
"=" + cookies[i].getValue());
}
names = hrequest.getHeaderNames();
while (names.hasMoreElements()) {
String name = (String) names.nextElement();
String value = hrequest.getHeader(name);
writer.println(" header=" + name + "=" + value);
}
writer.println(" method=" + hrequest.getMethod());
writer.println(" pathInfo=" + hrequest.getPathInfo());
writer.println(" queryString=" + hrequest.getQueryString());
writer.println(" remoteUser=" + hrequest.getRemoteUser());
writer.println("requestedSessionId=" +
hrequest.getRequestedSessionId());
writer.println(" requestURI=" + hrequest.getRequestURI());
writer.println(" servletPath=" + hrequest.getServletPath());
}
writer.println("=============================================");
// Log the resulting string
writer.flush();
filterConfig.getServletContext().log(sw.getBuffer().toString());
// Pass control on to the next filter
chain.doFilter(request, response);
| public void | init(javax.servlet.FilterConfig filterConfig)Place this filter into service.
this.filterConfig = filterConfig;
| public java.lang.String | toString()Return a String representation of this object.
if (filterConfig == null)
return ("RequestDumperFilter()");
StringBuffer sb = new StringBuffer("RequestDumperFilter(");
sb.append(filterConfig);
sb.append(")");
return (sb.toString());
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