java程序连接SQlServer的问题 - Java / Java SE

import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class QueryTest 
{
private Connection con;

public static void main(String [] atgs)
{
QueryTest test = new QueryTest();
Connection con = test.getConnection();
String sql = "select * from Student";
test.getStudent(con, sql);

}
public void getStudent(Connection con, String sql)
{
try 
{
Statement st = con.createStatement(); //申请会话
ResultSet rs = st.executeQuery(sql); //获得查询记录集
while( rs.next() )
{
String name = rs.getString( "姓名" );
String number = rs.getString( "学号" );
String sex = rs.getString( "性别" );
Date date = rs.getDate( "生日" );
String spe = rs.getString( "专业" );
String address = rs.getString( "籍贯" );

System.out.println( "\n姓名： " + name + "\t学号" + number + "\t性别" + sex 
+ "\t生日" + date + "\t专业" + spe + "\t籍贯" + address );
}
st.close();
con.close();
}
catch( SQLException e )
{