java 查看 HTTP 头信息

Java 其实很强大。可以获取HTTP头的详细信息，做出更为细致的处理，如获得文件最后修改时间等。

代码：

	void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
	    Enumeration enum1 = req.getHeaderNames();
	    
	    log.debug("-----------header----------------->");
	    while(enum1.hasMoreElements()){
	        String key = (String)enum1.nextElement();
	        String value = req.getHeader(key);
	        log.debug(key + ":" + value);
	    }
	    log.debug("<-----------header-----------------");
        }

结果：

-----------header----------------->
Accept:*/*
Referer:http://localhost:9080/UtanWeb/imgsys/main/regTempMgr.html
Accept-Language:zh-cn
Accept-Encoding:gzip, deflate
If-Modified-Since:Thu, 15 Sep 2011 12:13:41 GMT
User-Agent:Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
Host:localhost:9080
Connection:Keep-Alive
<-----------header-----------------