servlet学习(三)
标签: servlet jsp
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" %>
<html>
<head>
<title>login</title>
<meta charset="utf-8">
<meta name="keyword" content="登录">
<meta name="description" content="">
<!--css/js-->
<style type="text/css"...>
</head>
<body>
<!--S form-->
<div class="my_text">
<a>登录界面</a>
</div>
<!--E form-->
<!--S form-->
<form action="loginControllerServlet" method="get" class="my_form">
<input class="return_msg" value="${msg}:${param.username}" placeholder=" ">
<input name="username" placeholder="please enter your name" type="text" class="my_input">
<input name="password" placeholder="please enter password" type="password" class="my_input">
<input type="submit" value="submit" class="my_button">
<input type="reset" value="reset" class="my_button">
</form>
<!--E form-->
<!--S span-->
<div class="span">
<span>don't have account?</span>
<a href="register.jsp">Now register!</a>
</div>
<!--E span-->
</body>
</html>
register.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>register</title>
<meta charset="utf-8">
<meta name="keyword" content="注册">
<meta name="description" content="">
<!--css/js-->
<style type="text/css"...>
</head>
<body>
<!--S text-->
<div class="my_text">
<a>注册界面</a>
</div>
<!--E text-->
<!--S form-->
<div>
<form action="registerControllerServlet" method="post" class="my_form">
<c:if test="${param.code==10001}">
<c:set value="用户已存在" var="msg" scope="request"/>
</c:if>
<c:if test="${param.code==10000}">
<c:set value="必要参数为空" var="msg" scope="request"/>
</c:if>
<input class="return_msg" value="${msg}" placeholder=" ">
<input name="username" placeholder="please enter your name" type="text" class="my_input" value="">
<input name="password" placeholder="please enter password" type="password" class="my_input">
<input name="age" placeholder="please enter your age" type="password" class="my_input">
<input type="submit" value="submit" class="my_button">
<input type="reset" value="reset" class="my_button">
</form>
</div>
<!--E form-->
<!--S span-->
<div class="span">
<span>already have an account?</span>
<a href="login.jsp">Go to login!</a>
</div>
<!--E span-->
</body>
</html>