解析表单输入的账号密码，从数据库中获取匹配项

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password = request.getParameter("password");

if (sqlM.SafeCheck(username) == false || sqlM.SafeCheck(password) == false)
{
	MSG = "alert('非法账号/密码输入');";
}
else
{
	// 搜索数据库
	String sql = "SELECT username from users where username = '" + username + "' and password = '" + password + "'";
	ResultSet rs = sqlM.executeQuery(sql);
	if (rs != null && rs.next() == true && username.equals(rs.getString(1))) // 好像数据库结果的下标是从 1 开始的
	{
		usero.setUsername(username);
		usero.setPassword(password);

		// 设置 cookies
		String username_code = java.net.URLEncoder.encode(username, "UTF-8");
		String password_code = java.net.URLEncoder.encode(password, "UTF-8");
		Cookie username_cookie = new Cookie("username", username_code);
		Cookie password_cookie = new Cookie("password", password_code);
		username_cookie.setMaxAge(60*60*24*3);
		password_cookie.setMaxAge(60*60*24*3);
		response.addCookie(username_cookie);
		response.addCookie(password_cookie);

		response.setStatus(response.SC_MOVED_TEMPORARILY);
		response.setHeader("Location", "welcome.jsp");

		return ;
	}
	else
	{
		MSG = "alert('账号或者密码出错');";
	}
}