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                System.out.println("rotocol: " + request.getProtocol());   

System.out.println("Scheme: " + request.getScheme());   

System.out.println("Server Name: " + request.getServerName() );   

System.out.println("Server Port: " + request.getServerPort());   

System.out.println("rotocol: " + request.getProtocol());   

System.out.println("Server Info: " + getServletConfig().getServletContext().getServerInfo());   

System.out.println("Remote Addr: " + request.getRemoteAddr());   

System.out.println("Remote Host: " + request.getRemoteHost());   

System.out.println("Character Encoding: " + request.getCharacterEncoding());   

System.out.println("Content Length: " + request.getContentLength());   

System.out.println("Content Type: "+ request.getContentType());   

System.out.println("Auth Type: " + request.getAuthType());   

System.out.println("HTTP Method: " + request.getMethod());   

System.out.println("ath Info: " + request.getPathInfo());   

System.out.println("ath Trans: " + request.getPathTranslated());   

System.out.println("Query String: " + request.getQueryString());   

System.out.println("Remote User: " + request.getRemoteUser());   

System.out.println("Session Id: " + request.getRequestedSessionId());   

System.out.println("Request URI: " + request.getRequestURI());   

System.out.println("Servlet Path: " + request.getServletPath());   

System.out.println("Accept: " + request.getHeader("Accept"));   

System.out.println("Host: " + request.getHeader("Host"));   

System.out.println("Referer : " + request.getHeader("Referer"));   

System.out.println("Accept-Language : " + request.getHeader("Accept-Language"));   

System.out.println("Accept-Encoding : " + request.getHeader("Accept-Encoding"));   

System.out.println("User-Agent : " + request.getHeader("User-Agent"));   

System.out.println("Connection : " + request.getHeader("Connection"));   

System.out.println("Cookie : " + request.getHeader("Cookie"));   

System.out.println("Created : " + session.getCreationTime());   

    JSP里，获取客户端的IP地址的方法是：request.getRemoteAddr()，这种方法在大部分情况下都是有效的。但是在通过了 Apache，Nagix等反向代理软件就不能获取到客户端的真实IP地址了。如果使用了反向代理软件，用 request.getRemoteAddr()方法获取的IP地址是：127.0.0.1或 192.168.1.110，而并不是客户端的真实IP。

      经过代理以后，由于在客户端和服务之间增加了中间层，因此服务器无法直接拿到客户端的 IP，服务器端应用也无法直接通过转发请求的地址返回给客户端。但是在转发请求的HTTP头信息中，增加了X-FORWARDED-FOR信息。用以跟踪原有的客户端 IP地址和原来客户端请求的服务器地址。

   下面是获取真实ip的一种方法，可以参考

               /**

 * 获取客户端ip

 * @return

 */

protected String getIp() {

HttpServletRequest request = this.getRequest();

String ip = request.getHeader("x-forwarded-for");

if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

ip = request.getHeader("Proxy-Client-IP");

}

if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

ip = request.getHeader("WL-Proxy-Client-IP");

}

if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

ip = request.getRemoteAddr();

}

return ip.trim().equals("0:0:0:0:0:0:0:1") ? "127.0.0.1" : ip;

}

      乱码问题，如果request.getHeader("Referer")链接中带有中文参数，那么在经过跳转的时候，就会出现乱码，这个时候需要用到String keyWords = new String(str.getBytes("ISO-8859-1"),"GBK");来进行编码转换！可是如果不是通过request.getHeader("Referer")链接链过来的也用keyWords = new String(str.getBytes("ISO-8859-1"),"GBK");来进行编码转换的话，就会出现乱码，解决的办法，首先，我用str.matches( "[\\u4E00-\\u9FA5]+")来判断这个字符串中是否有中文，如果没有中文，则为乱码或者数字或者英文或者其他符号，那么我们则进行编码转换，如果是中文，则不进行编码转换