叨叨两句
- ~
记住用户名
- 在servlet中增长一个判断,若是客户端须要记住用户名,则新建一个cookie,有效期不为0,若是不须要了,则有效期为0
- 登陆成功,请求转发到登陆欢迎页面
- 登陆失败,请求转发到原登陆页面
package com.qq.web.servlet;
import java.io.IOException;
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 com.qq.bean.User;
import com.qq.service.UserService;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//拿到参数
String username = request.getParameter("username");
String password = request.getParameter("password");
String remeber = request.getParameter("remeber");
//调用service层处理登陆请求
UserService userService = new UserService();
User user = userService.doLogin(username,password);
Cookie cookie = new Cookie("username", username);
//检查是否须要记住用户名
if ("on".equals(remeber)) {
//设置cookie有效期
cookie.setMaxAge(24*60*60);
} else {
//不须要则清空cookie
//设置cookie有效期
cookie.setMaxAge(0);
}
//设置cookie有效范围
cookie.setPath(request.getContextPath());
//添加cookie
response.addCookie(cookie);
//根据返回的user决定如何响应
if(user != null) {
//登陆成功,重定向到欢迎页面
System.out.println(user);
request.setAttribute("user", user);
request.getRequestDispatcher("/success.jsp").forward(request, response);
// response.sendRedirect(request.getContextPath()+"/success.jsp");
} else {
//登陆失败,请求转发到登陆页面,并输出错误信息
request.setAttribute("msg", "用户名或密码错误");
request.getRequestDispatcher("/login.jsp").forward(request, response);
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}