关于servlet中的路径的几个函数的例子：

假设有如下请求的路径：

http://192.168.1.191:8083/CitizenWeb/TestServlet?ywdm=01&czmd=02&dd=00030

1. /CitizenWeb

request.getContextPath(); 

2.  TestServlet

request.getRequestURI().substring(request.getRequestURI().lastIndexOf("/") + 1);

3.  /CitizenWeb/TestServlet
request.getRequestURI();

4.  http://192.168.1.191:8083/CitizenWeb/TestServlet
request.getRequestURL()

5. dd=00030&ywdm=01&czmd=02

getUrl(request)

 private String getUrl(HttpServletRequest request)
{
String url = "";
Enumeration param = request.getParameterNames();

while (param.hasMoreElements()) {
String pname = param.nextElement().toString();
if (!pname.equalsIgnoreCase("pagenum") && !pname.equalsIgnoreCase("submit"))
url += pname + "=" + request.getParameter(pname) + "&";

}
if (url.endsWith("&")) {
url = url.substring(0, url.lastIndexOf("&"));
}
return url;
}

6. http://192.168.1.191:8083/CitizenWeb/TestServlet?ywdm=01&czmd=02&dd=00030

request.getRequestURL()+"?"+getUrl(request)；