SqlServer默认端口1433未开放导致java.sql.SQLException: Network error IOException: Connection refused: connect

异常如下:

java.sql.SQLException: Network error IOException: Connection refused: connect

    at net.sourceforge.jtds.jdbc.ConnectionJDBC2.<init>(ConnectionJDBC2.java:385)
    at net.sourceforge.jtds.jdbc.ConnectionJDBC3.<init>(ConnectionJDBC3.java:50)
    at net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:182)
    at java.sql.DriverManager.getConnection(DriverManager.java:582)

    at java.sql.DriverManager.getConnection(DriverManager.java:185)

默认端口是1433, 也可以改为其他端口, 数据库连接工具类就需要改一下