求助关于jdbc连接sql server的配置问题？

写成sa总是可以的吗？
我在sql server2000里建了一个ScienceManage数据库，然后建了一个database.properties文件，内容是
jdbc.drivers=com.microsoft.jdbc.sqlserver.SQLServerDriver
jdbc.url=jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=ScienceManage
jdbc.username=sa
jdbc.password=
然后运行TestDB.java文件，
import java.sql.*;
import java.io.*;
import java.util.*;/**
   This program tests that the database and the JDBC 
   driver are correctly configured.
*/
class TestDB
{  
   public static void main (String args[])
   {  
      try
      {  
         Connection conn = getConnection();
         Statement stat = conn.createStatement();         stat.execute("CREATE TABLE Greetings (Name CHAR(20))");
         stat.execute(
            "INSERT INTO Greetings VALUES ('Hello, World!')");         ResultSet result 
            = stat.executeQuery("SELECT * FROM Greetings");
         result.next();
         System.out.println(result.getString(1));
         result.close();         stat.execute("DROP TABLE Greetings");
      
         stat.close();
         conn.close();
      }
      catch (SQLException ex)
      {  
         while (ex != null)
         {  
            ex.printStackTrace();
            ex = ex.getNextException();
         }
      }
      catch (IOException ex)
      {  
         ex.printStackTrace();
      }
   }   /**
      Gets a connection from the properties specified
      in the file database.properties
      @return the database connection
   */
   public static Connection getConnection()
      throws SQLException, IOException
   {  
      Properties props = new Properties();
      FileInputStream in 
         = new FileInputStream("database.properties");
      props.load(in);
      in.close();      String drivers = props.getProperty("jdbc.drivers");
      if (drivers != null)
         System.setProperty("jdbc.drivers", drivers);
      String url = props.getProperty("jdbc.url");
      String username = props.getProperty("jdbc.username");
      String password = props.getProperty("jdbc.password");      return
         DriverManager.getConnection(url, username, password);
   }
}运行后为什么是
---------- java ----------
java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC][SQLServer]用户 'sa' 登录失败。原因: 未与信任 SQL Server 连接相关联。
at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSRequest.processErrorToken(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSRequest.processReplyToken(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSLoginRequest.processReplyToken(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSRequest.processReply(Unknown Source)
at com.microsoft.jdbc.sqlserver.SQLServerImplConnection.open(Unknown Source)
at com.microsoft.jdbc.base.BaseConnection.getNewImplConnection(Unknown Source)
at com.microsoft.jdbc.base.BaseConnection.open(Unknown Source)
at com.microsoft.jdbc.base.BaseDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at TestDB.getConnection(TestDB.java:73)
at TestDB.main(TestDB.java:20)
java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]An error occured while attempting to log onto the database.
at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSLoginRequest.processReplyToken(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSRequest.processReply(Unknown Source)
at com.microsoft.jdbc.sqlserver.SQLServerImplConnection.open(Unknown Source)
at com.microsoft.jdbc.base.BaseConnection.getNewImplConnection(Unknown Source)
at com.microsoft.jdbc.base.BaseConnection.open(Unknown Source)
at com.microsoft.jdbc.base.BaseDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at TestDB.getConnection(TestDB.java:73)
at TestDB.main(TestDB.java:20)