HttpServletRequest获取请求

public class DemoServlet01 extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//1.获取HTTP请求消息中的请求方式System.out.println("请求方式：" + request.getMethod());//2.获取请求行中资源名称部分System.out.println("资源部分= url:" + request.getRequestURL());//3.获取请求行中的参数部分System.out.println("请求行中的参数：" + request.getQueryString());//4.获取请求行的协议和版本System.out.println("请求的协议个版本："+request.getProtocol());//5.获取WEB应用程序的路径System.out.println("获取应用程序的路径:"+ request.getContextPath());//6.获取Servlet的名称或Servlet所映射的路径 System.out.println("获取Servlet的名称:"+request.getServerName());System.out.println( "路径：" + request.getServletPath());//7.获取请求客户端的IP地址System.out.println("获取客户端的IP地址：" + request.getRemoteAddr());//8.获取请求客户端的完整主机名System.out.println("获取请求客户端的完整主机名:" + request.getRemoteHost());//9.获取请求客户端网络连接的端口号System.out.println("客户端网络连接的端口号:" + request.getRemotePort());//10.获取Web服务器上接收当前请求网络连接的IP地址System.out.println("接收当前请求网络连接的IP地址:" + request.getLocalAddr());//11.获取Web服务器上接收当前网络连接IP所对应的主机名System.out.println("接收当前网络连接IP所对应的主机名:"+request.getLocalName());//12.获取Web服务器上接收当前网络连接的端口号System.out.println("获取Web服务器上接收当前网络连接的端口号：" + request.getLocalPort());//13.获取当前请求所指向的主机名System.out.println("获取当前请求所指向的主机名:" + request.getServerName());//14.获取当前请求所连接的服务器端口号System.out.println("获取当前请求所连接的服务器端口号:" + request.getServerPort());//15.获取请求的协议名System.out.println("获取请求的协议名：" + request.getScheme());//16.获取客户端发出请求时的完整URLSystem.out.println("获取客户端发出请求时的完整URL:" + request.getRequestURL());}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

public class DemoServlet02 extends HttpServlet {protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setCharacterEncoding("text/html;charset=utf-8");//1.获取一个指定头字段值System.out.println(request.getHeader("host"));//2.获取指定头字段的多个值Enumeration<String> names = request.getHeaderNames();while(names.hasMoreElements()){System.out.println(names.nextElement());}//3. 获取请求头中所有的请求头字段的名称Enumeration<String> list = request.getHeaderNames();//所有的键while(list.hasMoreElements()){String name = list.nextElement();String header = request.getHeader(name);response.getWriter().println(name + " === " + header + "<br/>");}//4.获取指定名称参数System.out.println("获取指定名称参数"+request.getParameter("username"));//5.获取所有参数名Enumeration<String> parameterNames = request.getParameterNames();//6.获取多个参数值System.out.println(Arrays.toString(request.getParameterValues("aihao")));//7.用于将请求消息中的所有参数名和值装入进一个Map对象中返回Map<String, String[]> map = request.getParameterMap();for (String key : map.keySet()) {System.out.println(key + "--" + map.get(key));}}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}