LoginServlet.java ~~~ package zyw.web; import zyw.bean.User; import zyw.service.UserService; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.sql.SQLException; @WebServlet(name = "LoginServlet",urlPatterns = "/login") public class LoginServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name = request.getParameter("name"); String password = request.getParameter("password"); UserService userService=new UserService(); User user=null; try { //调用service中登录方法 user = userService.login(name, password); } catch (SQLException e) { e.printStackTrace(); } if (user!=null){ //登录成功后我们再获取是否保存密码的信息，如果失败了保存密码就没有意义了 String remember = request.getParameter("remember"); if (remember.equals("yes")){ // 将用户名和密码加入到cookie中 Cookie nameCookie = new Cookie("name", name); Cookie passwordCookie = new Cookie("password", password); //设置cookie的有效期 防止销毁 nameCookie.setMaxAge(60*10);//10分钟 passwordCookie.setMaxAge(60*10); //将cookie发送给客户端保存 response.addCookie(nameCookie); response.addCookie(passwordCookie); } //登录成功跳转生鲜种类列表界面 response.sendRedirect(request.getContextPath()+"/category-list.jsp"); }else { //登录失败提示 response.setContentType("text/html;charset=utf-8"); response.getWriter().write("用户登录失败"); } } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } } ~~~ 在LoginServlet.java中加入代码段 ~~~ //登录成功后我们再获取是否保存密码的信息，如果失败了保存密码就没有意义了 String remember = request.getParameter("remember"); if (remember.equals("yes")){ // 将用户名和密码加入到cookie中 Cookie nameCookie = new Cookie("name", name); Cookie passwordCookie = new Cookie("password", password); //设置cookie的有效期 防止销毁 nameCookie.setMaxAge(60*10);//10分钟 passwordCookie.setMaxAge(60*10); //将cookie发送给客户端保存 response.addCookie(nameCookie); response.addCookie(passwordCookie); } ~~~ 在前端login.jsp中加入jstl表达式获取cookie值  登录之后重新登录即可记住密码