servlet学习（三）

servlet学习（三）

标签： servlet jsp

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做了一些小改变，登录servlet使用url转发方式传递参数，页面可以直接用el表达式获取信息，注册页面servlet不变，通过jstl取代小脚本并将值放入自己定义的作用域当中，再用el表达式取值。

loginServlet

package controller;

import service.LoginService;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Created by Fate on 2016/7/1.
 */
public class LoginControllerServlet extends HttpServlet {


    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        LoginService LoginService = new LoginService();
        boolean result = LoginService.login(username, password);
        if (result) {
            resp.sendRedirect("wel.jsp");
            return;
        }
        String msg = "用户名或密码不正确";
        req.setAttribute("msg",msg);
        req.getRequestDispatcher("login.jsp").forward(req,resp);
    }

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

login.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    
    "utf-8">
    name="keyword" content="登录">
    name="description" content="">
    --css/js-->