100分求jsp方法为什么连接不了数据库的解决方法

<%!
private void myfun(int Class1){

String sql="select * from User_News_Site where News_Class="+Class1+"";
ResultSet rs = stmt.executeQuery(sql);
while(rs.next()){
if (rs.getString("News_Name")!=null) {
System.out.println(rs.getString("News_Name"));
}
else
{
System.out.println("没有此类新闻");

}

}

}

%>

补充：已经包含了数据库连接文件 <%@ includ file=include/sql_class.jsp%>

错误是：An error occurred at line: 10 in the jsp file: /2myhome/rzbt/ph.jsp
Generated servlet error:
stmt cannot be resolved

<%Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {

Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver")
.newInstance();
String url="jdbc:microsoft:sqlserver://121.56.35.243:1433;DatabaseName=jsp_data";

//pubs为你的数据库的
String user="sa";
String password="5a391e15";
conn = DriverManager.getConnection(url, user,
password);
System.out.println(conn);
stmt = conn.createStatement(
ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
request.setCharacterEncoding("gb2312");//设置语言
String sql="select * from User_News_Site where News_Class="+Class1+"";
rs = stmt.executeQuery(sql);
while (rs.next()) {
if (rs.getString("News_Name") != null) {
System.out.println(rs.getString("News_Name"));
} else {