1、请求更多方法

/*******[1]获得req对象中的头信息*(了解)*******************/Enumeration<String> headerNames = req.getHeaderNames();while(headerNames.hasMoreElements()){String next = headerNames.nextElement();System.out.println(next+"-----"+req.getHeader(next));}/*******[2]获得URL地址信息*********************///httpSystem.out.println(req.getScheme());//127.0.0.1System.out.println(req.getServerName());//8888System.out.println(req.getServerPort());//   /servlet/MoreServletSystem.out.println(req.getServletPath());// √  /servlet22   System.out.println(req.getContextPath());// √ /servlet22/servlet/MoreServletSystem.out.println(req.getRequestURI());// √ http://127.0.0.1:8888/servlet22/servlet/MoreServlet  System.out.println(req.getRequestURL());// GETSystem.out.println(req.getMethod());// √ pwd=123&zh=456System.out.println(req.getQueryString());/********[3]req对象获得值的操作 (重点)****************///获得前台的数据String  zh = req.getParameter("zh");//获得前台的爱好的选择的多选操作String[] hobby = req.getParameterValues("hobby");/*********[4]获得远程的和本地的信息(了解)*************///获得远程的信息---客户端浏览器System.out.println(req.getRemoteAddr());System.out.println(req.getRemoteHost());System.out.println(req.getRemotePort());//获得本地的信息---本地服务器System.out.println(req.getLocalAddr());System.out.println(req.getLocalName());System.out.println(req.getLocalPort());/***********[5]获得其他对象的操作(重点)************************///获得session对象HttpSession session = req.getSession();//获得全局的对象ServletContext servletContext = req.getServletContext();ServletContext servletContext2 = this.getServletContext();//获得cookie对象Cookie[] cookies = req.getCookies();/***********[6]req对象中的其他的方法(重点)*******************///解决中文乱码req.setCharacterEncoding("utf-8");//转发req.getRequestDispatcher("").forward(req, resp);req.setAttribute("msg", "");req.getAttribute("msg");

2、响应更多方法

 	resp.setContentType("text/html;charset=utf-8");//设置响应回去的编码方式resp.setCharacterEncoding("utf-8");//设置文本的长度  ---文件下载的时候需要使用resp.setContentLength(1024);//重定向/*resp.sendRedirect("");*///把cookie对象保存到resp对象中resp.addCookie(cookie);//(了解)//在响应头中添加对应的信息如果name一致也不会覆盖resp.addHeader("cou", "javaEE");resp.addHeader("cou", "javaSE");//设置指定的响应头信息  name一致会覆盖resp.setHeader("cou1", "java");resp.setHeader("cou1", "javascript");