org.postgresql.util.PSQLException: Connexion refusÚe. VÚrifiez que le nom de mac
hine et le port sont corrects et que postmaster accepte les connexions TCP/IP.
        at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(Conne
ctionFactoryImpl.java:136)
        at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactor
y.java:66)
        at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Conn
ection.java:125)
        at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Conn
ection.java:30)
        at org.postgresql.jdbc3.Jdbc3Connection.<init>(Jdbc3Connection.java:24)
        at org.postgresql.Driver.makeConnection(Driver.java:393)
        at org.postgresql.Driver.connect(Driver.java:267)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at administrateur.Connect.main(Connect.java:21)
        at administrateur.Fenetre.<init>(Fenetre.java:20)
        at administrateur.TestFenetreAdministrateur.main(TestFenetreAdministrate
ur.java:7)
        at TestAdmin.main(TestAdmin.java:10)
Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(Unknown Source)
        at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.SocksSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at org.postgresql.core.PGStream.<init>(PGStream.java:62)
        at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(Conne
ctionFactoryImpl.java:76)

String url = "jdbc:postgresql://localhost:5432/mabase";        
Connection conn = DriverManager.getConnection(url, user, passwd);