HttpServletRequest学习

HttpServletRequest代表客户端的请求，用户通过Http协议访问服务器，Http请求中的所有信息会被封装到HttpServletRequest，通过这个HttpServletRequest的方法，获取客户端的所有信息。

1.获取前端传递的参数

常用方法如上图

2.请求转发

        req.setCharacterEncoding("UTF-8");
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String[] hobby = req.getParameterValues("hobby");
        System.out.println("===========");
        //后台接收，中文乱码问题，
        System.out.println("username");
        System.out.println("password");
        System.out.println(Arrays.toString(hobby));
        System.out.println("================");
        System.out.println(req.getContextPath());
        req.getRequestDispatcher("/success.jsp").forward(req, resp);