Servlet学习-request

public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        
        //获取url
        String url = request.getRequestURL().toString();
        //获取uri
        String uri = request.getRequestURI();
        //QueryString获取？后面的参数和值
        String qs =request.getQueryString();
        //IP地址
        String ip = request.getRemoteAddr();
        //主机名
        String host  = request.getRemoteHost();
        //网络端口号
        int port = request.getRemotePort();
        int localport = request.getLocalPort();
        //拆分内容
        String[] substr = qs.split("&");
        for(String s:substr)
        {
        //    out.println(Mytools.GetString(s)+"<br>");
            String ss[] = s.split("=");
            out.println(ss[0]+"转前= "+ss[1]+"<br>");
            out.println(ss[0]+"转后= "+Mytools.GetString(ss[1])+"<br>");
        }
        
        
        
        out.println("localport= "+localport+"<br>");
        out.println("IP= "+ip+"<br>");
        out.println("host= "+host+"<br>");
        out.println("qs= "+qs+"<br>");
        out.println("url= "+url+"<br>");
        out.println("uri= "+uri+"<br>");
        out.println("port= "+port+"<br><br>");
        
        
        //getHeaderNames 获取HTTP请求所有的消息头
        Enumeration<String> hn= request.getHeaderNames();
        while(hn.hasMoreElements())
        {
            String headname = hn.nextElement();
            out.println(headname+":    "+request.getParameter(headname)+"<br>");
        }
    }

request用于获取http请求的信息