我正在尝试连接一台内置oracle数据库11gr2的linux机器。将PL / SQL开发人员与任何用户连接都没有问题。不幸的是，使用我的简单java应用程序，无法连接到数据库。
这是我的java代码：
JAVA CODE
package oraConn;
import java.sql.*;
public class OraConn {
public static void main(String[] args) {
Connection connection=null;
try {
String driverName= "oracle.jdbc.driver.OracleDriver";
Class.forName(driverName);
String serverName="192.168.2.122";
String portNumber="1521";
String sid="sas";
String url="jdbc:oracle:thin:@" + serverName + ":" + portNumber +":"+sid;
String userName = "system";
String password = "welcome";
connection = DriverManager.getConnection(url,userName,password);
} catch (Exception e) {
e.printStackTrace();
}
}
}
当我运行此代码块时，我得到一个像这样的例外：
java.sql.SQLException: IO Error: Connection refused
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:489)
at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:553)
at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:254)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:528)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at oraConn.OraConn.main(OraConn.java:16)
Caused by: oracle.Exception: Connection refused
at .ns.NSProtocol.connect(NSProtocol.java:399)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1140)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:340)
... 7 more
我确信端口1521是开放的，因为我可以使用PL / SQL开发人员。我该怎么办？
