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Iam試圖從系統訪問數據庫到其他系統，下面是代碼。如何使用java訪問遠程數據庫
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class testConnection {
/**
* @param args
* @throws SQLException
*/
public static void main(String[] args) throws SQLException {
// TODO Auto-generated method stub
String connectionURL = "jdbc:sqlserver://xxx.xxx.xx.xx:1433;DatabaseName=fingerprintdb;user=sa;password=test";
// Change the connection string according to your db, ip, username and password
Connection con = null;
try {
// Load the Driver class.
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
// If you are using any other database then load the right driver here.
//Create the connection using the static getConnection method
con = DriverManager.getConnection (connectionURL);
//Create a Statement class to execute the SQL statement
Statement stmt = con.createStatement();
//Execute the SQL statement and get the results in a Resultset
ResultSet rs = stmt.executeQuery("select moviename, releasedate from movies");
// Iterate through the ResultSet, displaying two values
// for each row using the getString method
while (rs.next())
System.out.println("Name= " + rs.getString("moviename") + " Date= " + rs.getString("releasedate"));
}
catch (SQLException e) {
e.printStackTrace();
}
catch (Exception e) {
e.printStackTrace();
}
finally {
// Close the connection
con.close();
}
}
}
以下是IAM取得的異常。
com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host xxx.xxx.xx.xx, port 1433 has failed. Error: "connect timed out. Verify the connection properties, check that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port, and that no firewall is blocking TCP connections to the port.".
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:170)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1049)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:833)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:716)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:841)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at testConnection.main(testConnection.java:26)
Exception in thread "main" java.lang.NullPointerException
at testConnection.main(testConnection.java:48)
Iam能夠從同一系統連接到數據庫。但現在我試圖連接遠程方式。
我從cmd提示符中輸入ipconfig得到了上述ip地址。 我是否正確，如果不是，請糾正我。
以下是對主機的ping記錄。
Pinging xxx.xxx.xx.xx with 32 bytes of data:
Reply from xxx.xxx.xx.xx: TTL expired in transit.
Reply from xxx.xxx.xx.xx: TTL expired in transit.
Reply from xxx.xxx.xx.xx: TTL expired in transit.
Reply from xxx.xxx.xx.xx: TTL expired in transit.
Ping statistics for xxx.xxx.xx.xx:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
您是否ping過主機？ –
@喬伊請檢查我的更新 – developer
感謝您的更新。您是否嘗試在該端口上打開telnet連接（1433）？只是爲了檢查特定的端口是否打開？ –