📄 verifylogin.jsp
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<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page
import="com.wxpn.tutorial.db.DB,com.wxpn.tutorial.db.ConnectionPool"%>
<%@ page
import="java.sql.Connection,java.sql.Statement,java.sql.ResultSet,java.sql.SQLException"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta http-equiv="Content-Language" content="zh-cn">
<title>登录</title>
</head>
<body>
<div align=center><font color="red"><strong> <%//获取提交的用户名：
String strUserName = request.getParameter("txtUserName");
//获取提交的密码：
String strPassword = request.getParameter("txtPassword");
if((strUserName ==null)||(strUserName.equals(""))||(strUserName.length()>20)){
response.sendRedirect("login.html");
}
if((strPassword ==null)||(strPassword.equals(""))||(strPassword.length()>20)){
response.sendRedirect("login.html");
}
//创建数据库连接对象：
ConnectionPool connPool = DB.getConnPool();
Connection conn = connPool.getConnection();
Statement stmt = null;
ResultSet rs = null;
try {
int nextMessageid = 0;
String relative_path = null;
//sql语句：
String sql = "select * from userinfo where username='"
+ strUserName + "' and userpwd='" + strPassword + "'";
//创建数据记录集对象：
stmt = conn.createStatement();
//执行sql语句，返回一个记录集到rs：
rs = stmt.executeQuery(sql);
//如果记录集为非空，表明有相匹配的用户名和密码，登录成功：
if (rs.next()) {
//登录成功时,把strUserName设成session变量UserName
session.setAttribute("UserName",strUserName);
out.println("登录成功!");
} else {
//否则（记录集为空），表明失败：
out.println("登录失败!");
}
} catch (SQLException sqlExc) {
sqlExc.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
//关闭连接，释放数据库资源：
try {
if (rs != null) {
rs.close();
}
if (stmt != null) {
stmt.close();
}
connPool.freeConnection(conn);
} catch (SQLException sqlExc) {
sqlExc.printStackTrace();
}
}
%> </strong> </font></div>
</body>
</html>
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