import java.sql.*;

 

public class ConnectionTest {

    public static void main(String[] arg) {

        try {

            Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

            String url = "jdbc:oracle:thin:@localhost:1521:TEST";

            String username = "SMNA";

            String password = "SMNA";

            Connection conn = DriverManager.getConnection(url, username,

                    password);

            Statement stmt = conn.createStatement();

            String sql = "select * from tb_smna_user_info";

            ResultSet rs = stmt.executeQuery(sql);

            while (rs.next()) {

                System.out .println("Database test" + rs.getString("column_name") == null ? ""  : rs.getString("column_name"));

            }

        } catch (Exception e) {

            System.out.println("err");

        }

    }

}

注意要导入 jdbc 的驱动 ojdbc14.jar 到 D:\tomcat\common\lib 下