问通过telnet连接到外部数据库

EN

String connectionString = "jdbc:jtds:sqlserver://"+dropez_ip_address+"/"+dropez_db_name;
ResultSet rs = null;
Statement stmt = null;

try{

    Class.forName("net.sourceforge.jtds.jdbc.Driver");
    Connection conn = DriverManager.getConnection(connectionString, dropez_db_username, dropez_db_password);

    stmt = conn.createStatement();
}catch(Exception e){}

Why do I get java.sql.SQLException: "Network error IOException: Connection refused: connect" when trying to get a connection?

The "Connection refused" exception is thrown by jTDS when it is unable to connect to the server. There may be a number of reasons why this could happen:

    - The server name is misspelled or the port number is incorrect.
    - SQL Server is not configured to use TCP/IP. Either enable TCP/IP from SQL Server's Network Utility app or have jTDS connect via named pipes (see the URL format for information on how to do this).
    - There is a firewall blocking port 1433 on the server.

To check whether TCP/IP is enabled and the port is not blocked you can use "telnet 1433". Until telnet doesn't connect, jTDS won't either. If you can't figure out why, ask your network administrator for help.