Jb2005不能连接SQLserver2000了,换了eclipse也一样,以前都能连的

Question

登陆模式:
1.在服务器端使用企业管理器,并且选择"使用 Windows 身份验证"连接上 SQL Server 
2.展开"SQL Server组",鼠标右键点击SQL Server服务器的名称,选择"属性",再选择"安全性"选项卡 
3.在"身份验证"下,选择"SQL Server和 Windows ". 
4.重新启动SQL Server服务. 

Answer 1

在"身份验证"下,选择"SQL   Server和   Windows 我本来就是这样设置的

Answer 2

telnet 127.0.0.1 1433  能通吗？？

Answer 3

我的代码是这样的
  public class Connection_jdbc
{
    public Connection getConnection()
    {
        Connection conn=null;
        try
        {
            Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
            conn=DriverManager.getConnection("jdbc:microsoft:sqlserver://127.0.0.1:1433;databasename=t102" ,"sa", "");
            return conn;
        }
        catch (ClassNotFoundException ex)
        {
            System.out.println("连接发生错误！");
            ex.printStackTrace();
        }
        catch (SQLException ex1)
        {
            System.out.println("连接数据库发生错误！");
            ex1.printStackTrace();
        }
        return null;
    }}
异常是
连接数据库发生错误！
java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Error establishing socket.
at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.sqlserver.tds.TDSConnection.<init>(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(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at my1128_io.Connection_jdbc.getConnection(Connection_jdbc.java:12)
at my1128_io.IO_Frame.getString(IO_Frame.java:58)
at my1128_io.IO_Frame.textIO(IO_Frame.java:114)
at my1128_io.IO_Frame.jButton1_actionPerformed(IO_Frame.java:152)
at my1128_io.IO_Frame_jButton1_actionAdapter.actionPerformed(IO_Frame.java:164)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at my1128_io.IO_Frame.getString(IO_Frame.java:64)
at my1128_io.IO_Frame.textIO(IO_Frame.java:114)
at my1128_io.IO_Frame.jButton1_actionPerformed(IO_Frame.java:152)
at my1128_io.IO_Frame_jButton1_actionAdapter.actionPerformed(IO_Frame.java:164)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Answer 4

at   my1128_io.Connection_jdbc.getConnection(Connection_jdbc.java:12) 就是这里
 Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver"); 
                        conn=DriverManager.getConnection("jdbc:microsoft:sqlserver://127.0.0.1:1433;databasename=t102"   ,"sa",   "");