private void getRequestLine(HttpServletRequest request,HttpServletResponse response) {
//请求方式  String method = request.getMethod();System.out.println(method);
//资源路径String uri =request.getRequestURI();String url=request.getRequestURL().toString();System.out.println(uri);System.out.println(url);
//请求参数字符串String queryString =request.getQueryString();System.out.println(queryString);
//协议及版本号String protocol = request.getProtocol();System.out.println(protocol);String scheme = request.getScheme();System.out.println(scheme);}

private void getRequestHead(HttpServletRequest request,HttpServletResponse response) {// 根据header的key获取其valueString user_agent = request.getHeader("User-Agent");System.out.println(user_agent);// 查询header所有的keynameEnumeration<String> enu = request.getHeaderNames();while (enu.hasMoreElements()) {System.out.println(enu.nextElement());}}

private void getRequestBody(HttpServletRequest request,HttpServletResponse response) throws IOException {// 获取请求实体中的数据// 请求实体中的数据有三种形式:// 1.application/x-www-form-urlencoded// 2.multipart/form-data// 3.text/plain// 对于1、3// getParameter() //无论post方式还是get方式都可以获取用户的请求数据String value = request.getParameter("username");System.out.println(value);String coment = request.getParameter("coment");System.out.println(coment);ServletInputStream in= request.getInputStream();FileOutputStream out = new FileOutputStream("d:\\1.txt");int len = 0;byte[] flush = new byte[1024];while ((len = in.read(flush)) != -1) {out.write(flush, 0, len);}out.close();in.close();}

    private void getIntenetInfo(HttpServletRequest request,HttpServletResponse response) {System.out.println("访问服务器的地址为：" + request.getRemoteAddr() + ":"+ request.getRemotePort());System.out.println("服务器的本地地址为：" + request.getLocalAddr() + ":"+ request.getLocalPort());}}

public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// 状态行// 协议版本 http状态码 htt状态描述// 应答头// 响应实体// 设置应答头response.setHeader("content-type", "image/jpeg; charset=utf-8");// 向用户输出字符数据/** PrintWriter out = response.getWriter(); out.write("<h1>你好世界！</h1>");* out.flush(); out.close();*/// 我们只能打开一个流为用户输出数据FileInputStream in = new FileInputStream("D:\\1.jpg");ServletOutputStream out = response.getOutputStream();int len = 0;byte[] flush = new byte[1024 * 1024];while ((len = in.read(flush)) != -1) {out.write(flush, 0, len);}out.flush();out.close();in.close();}