Request对象请求数据

获取请求方式 ：GET
String method = request.getMethod();

设置编码格式

request.setCharacterEncoding("utf-8");
获取虚拟目录：/day14
String contextPath = request.getContextPath();
获取Servlet路径: /demo1
String servletPath = request.getServletPath();
 获取get方式请求参数：name=zhangsan
String queryString = request.getQueryString();
获取请求URI
String requestURI = request.getRequestURI();
StringBuffer requestURL = request.getRequestURL()
获取协议及版本：HTTP/1.1
String protocol = request.getProtocol();
获取客户机的IP地址：
String remoteAddr = request.getRemoteAddr();

设置流的编码
request.setCharacterEncoding("utf-8");

获取请求参数username
 String username = request.getParameter("username");

获取字符流
 BufferedReader br = request.getReader();
读取数据
String line = null;
while((line = br.readLine()) != null){
        System.out.println(line);

获取所有请求头名称
Enumeration<String> headerNames = request.getHeaderNames();
遍历
while(headerNames.hasMoreElements()){
String name = headerNames.nextElement();
据名称获取请求头的值
String value = request.getHeader(name);
System.out.println(name+"---"+value);