創建數據庫連接失敗！
com.microsoft.sqlserver.jdbc.SQLServerException: 到主機 ?的 TCP/IP 連接失敗。 java.net.ConnectException: Connection refused: connect
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.loginWithoutFailover(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.mingrisoft.dao.GetConnection.getCon(GetConnection.java:21)
at com.mingrisoft.dao.UserDao.getUser(UserDao.java:11)
at com.mingrisoft.main.Enter$2.actionPerformed(Enter.java:111)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$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.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$400(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(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)

源代碼是：

public class GetConnection { private Connection con; //定義數據庫連接類對象 private PreparedStatement pstm; private String user="sa"; //連接數據庫用戶名 private String password="sa"; //連接數據庫密碼 private String className="com.microsoft.sqlserver.jdbc.SQLServerDriver"; //數據庫驅動 private String url="jdbc:sqlserver://localhost:1433;DatabaseName=db_supermarket"; //連接數據庫的URL public GetConnection(){try{Class.forName(className);}catch(ClassNotFoundException e){System.out.println("加載數據庫驅動失敗！");e.printStackTrace();} } /**創建數據庫連接*/ public Connection getCon(){try {con=DriverManager.getConnection(url,user,password); //獲取數據庫連接} catch (SQLException e) {System.out.println("創建數據庫連接失敗！");con=null;e.printStackTrace();}return con; //返回數據庫連接對象 }解決方法：

安裝SQL Server 2005后。在目錄下找到SQL Server Configuration Manager這個工具，然后在左邊的目錄中找到SQL Server 2005網絡配置下的MSSQLSERVER，點擊后右側列出了所有協議，找到TCP/IP，發現是禁用狀態，啟用后再重啟MSSQLSERVER服務即可（此步驟必須！），此項可在該工具下的SQL Server 2005服務中找到，或在windows服務中找到。

總結

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