JSP_1.zip_JSP实现页面跳转_jsp学易网登录

package cn.itcast.servlet; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class LoginServlet extends HttpServlet { /** * */ private static final long serialVersionUID = 1L; public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /* * 1.获取表单数据 */ //处理中文问题 request.setCharacterEncoding("UTF-8"); //获取 String username=request.getParameter("username"); String password=request.getParameter("password"); /* * 2.校验用户名和密码是否正确 */ if(!"itcast".equalsIgnoreCase(username)){ //登陆成功 /* * 附加项：把用户名保存到cookie中，发送给客户端浏览器 * 当再次打开login.jsp时，login.jsp会读取request中的cookie，把它显示到用户名文本框中 */ Cookie cookie =new Cookie("uname",username);//创建Cookie cookie.setMaxAge(60*60*24);//设置cookie命长为一天 response.addCookie(cookie);//保存cookie /* * 3.如果成功 * 保存信息到session中 * 重定向到succ1.jsp中 */ HttpSession session =request.getSession();//获取session session.setAttribute("username",username);//向session域中保存用户名 response.sendRedirect("/JSP_1/session2/succ1.jsp"); }else{ //登陆失败 /* * 4.如果失败 * 保存错误信息到request域中 * 转发到login.jsp */ request.setAttribute("msg", "用户名或密码错误!"); RequestDispatcher qr =request.getRequestDispatcher("/session2/login.jsp");//得到转发器 qr.forward(request,response);// 转发 } } }