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我一直在尝试在 Eclipse 中使用 JDBC 连接到位于http://mysql10.000webhost.com的外部 MySQL 服务器位置，但我一直收到错误消息。这是我的代码：

    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.sql.Statement;

    import com.mysql.jdbc.PreparedStatement;

    //import com.mysql.jdbc.Driver;

    public class Main {
        public static void main(String[] args) throws SQLException {
            try{
            Class.forName("com.mysql.jdbc.Driver").newInstance();
    Connection conn=DriverManager.getConnection("jdbc:mysql://mysql10.000webhost.com/database","username","password");
    java.sql.PreparedStatement statement = conn.prepareStatement("SELECT * FROM promoid");
    ResultSet result=statement.executeQuery();
    while(result.next())
    {
        System.out.println(result.getString(1));
    }
        }

        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
    }

这是我得到的错误：

    com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

    The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2479)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2516)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2301)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at Main.main(Main.java:15)
    Caused by: java.net.ConnectException: Connection timed out: 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 com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
        ... 15 more

JDBC 不能连接到本地主机之外的数据库吗？

4

1 回答 1

0 
Caused by: java.net.ConnectException: Connection timed out: connect.

您是否尝试过port 3306在主机上远程登录（mysql 默认值）mysql10.000webhost.com？

我敢打赌，他们在防火墙上阻止了你。

于 2013-04-18T00:03:05.273 回答