使用Java進行項目開發，一般是使用MySQL數據庫，由於項目需要本次換成了SQLServer數據庫，在eclipse中進行連接測試時驅動類、URL地址、用戶名和密碼都正確，但是會拋出以下異常，無法正確連接到SQLServer數據庫
com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host localhost, port 1433 has failed.
Error: "Connection refused: connect. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall.".
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:206) ~[mssql-jdbc-6.1.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerException.ConvertConnectExceptionToSQLServerException(SQLServerException.java:257) ~[mssql-jdbc-6.1.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.SocketFinder.findSocket(IOBuffer.java:2385) ~[mssql-jdbc-6.1.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.TDSChannel.open(IOBuffer.java:567) ~[mssql-jdbc-6.1.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1955) ~[mssql-jdbc-6.1.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:1616) ~[mssql-jdbc-6.1.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectInternal(SQLServerConnection.java:1447) ~[mssql-jdbc-6.1.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:788) ~[mssql-jdbc-6.1.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1187) ~[mssql-jdbc-6.1.0.jre8.jar:na]
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1408) ~[druid-1.0.18.jar:1.0.18]
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1464) ~[druid-1.0.18.jar:1.0.18]
at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:1969) ~[druid-1.0.18.jar:1.0.18]
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這是由於SQLServer安裝默認是禁用TCP/IP協議的，而連接SQLServer需要啟用TCP/IP協議
解決方法：在搜索欄中搜索SQLServer，打開SQLServer配置管理器，在SQLServer配置器的網絡配置中啟用TCP/IP協議。
修改之后就可以成功連接到SQLServer數據庫了。
