HttpServletRequest
HttpSession session = request.getSession(true); //获取会话对象
Cookie[] cookies = request.getCookies(); //获取请求相关的Cookie
HttpServletResponse
response.setContentType("text/html;charset=GB2312"); //设置页面格式
response.setContentType("application/pdf"); //设置页面格式为PDF
response.setContentType("application/msword"); //Servlet打开一个word文档
response.setContentType("application/vnd.ms-excel"); //Servlet打开一个excel表
response.setCharacterEncoding("gb2312"); //确保参数信息以汉字编码方式提取
PrintWriter out = response.getWriter(); //获取页面的输出流
//字符串作为URL格式编码，其中的某些字符将被十六进制的转义序列进行替换
String encodedUrl = response.encodeURL(contextPath+"/servlet/URLRewriteServer?name=张三&age=27");