[求助]不理解的JDBC错误？

import java.sql.*;

public class DBConnection
{
public static void main(String[] args)
{
String sql = "SELECT * FROM information";
try
{
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
Connection conn = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433; DatabaseName=pubs","sa","");
if(conn != null)
{
System.out.println("连接数据库成功！");
}else
{
System.out.println("数据库连接失败");
}
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(sql);
while(rs.next())
{
System.out.print(1+'\t');
System.out.print(2+'\t');
System.out.print(3+'\t');
System.out.println(4);
}
rs.close();
st.close();
conn.close();
}catch(ClassNotFoundException ce)
{
ce.printStackTrace();
System.out.println("找不到驱动程序");
}catch(SQLException e)
{
e.printStackTrace();
System.out.println("数据库操作有错误");
}
}
}
这是代码。。各位帮忙指点迷津