使用Java进行项目开发，一般是使用MySQL数据库，由于项目需要本次换成了SQLServer数据库，在eclipse中进行连接测试时驱动类、URL地址、用户名和密码都正确，但是会抛出以下异常，无法正确连接到SQLServer数据库

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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这是由于SQLServer安装默认是禁用TCP/IP协议的，而连接SQLServer需要启用TCP/IP协议

解决方法：在搜索栏中搜索SQLServer，打开SQLServer配置管理器，在SQLServer配置器的网络配置中启用TCP/IP协议。

修改之后就可以成功连接到SQLServer数据库了。