20170704

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se 69

http://localhost/20170704/first

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>登录页面</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>

<body>
<form method="post" action="LonginServlet">
用户名：<input type="text" name="username"/><br>
密码：<input type="password" name="password"/><br>
<input type="submit" value="登录"/>
</form>
</body>
</html>

public class LonginServlet extends HttpServlet {

@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
String username = request.getParameter("username");
String password = request.getParameter("password");

PrintWriter out = response.getWriter();
out.println("用户名：" + username);
out.println("密码：" + password);

UserDao userDao = UserDao.getInstance();
Map<String, String> map = new HashMap<String, String>();
map.put("username", username);
map.put("password", password);
User user = userDao.getUserByMap(map);

if(user != null){
out.print("在数据库中存在");
}else{
out.print("在数据库中不存在");
}

out.flush();
out.close();
}
}

<servlet>
<servlet-name>LonginServlet</servlet-name>
<servlet-class>com.yy.servlet.web.servlet.LonginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LonginServlet</servlet-name>
<url-pattern>/LonginServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>

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