一.设置响应内容类型
response.setContentType("text/html;charset=UTF-8");
二.设置请求的字符编码
request.setCharacterEncoding("utf-8");
三.获取调度器
RequestDispatcher rd = request.getRequestDispatcher("/index.jsp");
rd.forward(request, response); 内部跳转
response.sendRedirect("add.jsp"); 重定向
response.sendRedirect(request.getContextPath()+"/WEB-INF/page/index.jsp");
==
request.getRequestDispatcher("page/index.jsp").forward(request,response);
==
PrintWriter writer = response.getWriter();
writer.write("<script>alert('账号密码错误!');window.location.href='login.jsp';</script>");
writer.flush();
writer.close();
四.获取前台上下文
HttpSession session = request.getSession();