response

总结：1.转发是一次请求，重定向是两次2.转发不会改变url，重定向会改变3.请求转发是在服务器内部完成的，而重定向是在客户端完成的4.转发的url必须是当前web工程内部的地址，重定向可以是任意地址

获取前端传递参数(request应用代码未运行成功）

https://www.bilibili.com/video/BV12J411M7Sj?p=15&spm_id_from=333.1007.top_right_bar_window_history.content.click&vd_source=5898104e0f6f9e5d5c0a3b934a97507d

点击查看代码

 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String[] hobbies = req.getParameterValues("hobbies");

        System.out.println("=======================");
        System.out.println(username);
        System.out.println(password);
        System.out.println(Arrays.toString(hobbies));
        System.out.println("========================");

        // 通过请求转发
        req.getRequestDispatcher(req.getContextPath()+"/success.jsp").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       doGet(req, resp);
    }
}