求教，sqlserver jdbc连不上数据库
package com.abc.sqlserver;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;public class TestSqlserver { /** * * @param args */ public static void main(String[] args) { try { Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); } catch (ClassNotFoundException e) { e.printStackTrace(); } String connectionUrl = "jdbc:sqlserver://localhost:1433;" + "databaseName=Test;"; try { Connection con = DriverManager.getConnection(connectionUrl,"sa","pwd");// System.out.println( con.isClosed());// con.close(); } catch (SQLException e) { e.printStackTrace(); } System.out.println("done"); }}