Question

我正在使用java fx创建登录到oracle db的loginsystem。我在这里遇到了两个问题，1。我无法连接到DB 2.我不确定我是否将ojdbc jar放到正确的位置。

所以我的代码是， UTIL / ConnectionDB.java

package Util;

import java.sql.*;
/**
 * Created by engineering09 on 12/3/2015.
 */

public class ConnectionDB {

    private static final String DB_USER = "WELTESMIN";
    private static final String DB_PASS = "123pass";
    private static final String DB_NAME = "WEN";

    public boolean openConnection(){
        boolean result;

        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            Connection conn = null;

            conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:"+DB_NAME+"",DB_USER,DB_PASS);

            if (conn != null){
                System.out.println("CONNECTION DONE");
            }
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
            result = false;
        }

        return result;
    }
}

和主要，

package Controller;

import Util.ConnectionDB;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("../View/login.fxml"));
        primaryStage.setTitle("Weltes Oxygen Management");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
        testConnection();
    }

    public void testConnection(){
        ConnectionDB connect = new ConnectionDB();
        connect.openConnection();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

请帮帮我，这是我的错误消息

java.sql.SQLRecoverableException：IO错误：网络适配器可以没有建立连接 oracle.jdbc.driver.T4CConnection.logon（T4CConnection.java:489）at oracle.jdbc.driver.PhysicalConnection。（PhysicalConnection.java:553）在oracle.jdbc.driver.T4CConnection。（T4CConnection.java:254）在 oracle.jdbc.driver.T4CDriverExtension.getConnection（T4CDriverExtension.java:32）在oracle.jdbc.driver.OracleDriver.connect（OracleDriver.java:528）at java.sql.DriverManager.getConnection（DriverManager.java:664）at java.sql.DriverManager.getConnection（DriverManager.java:247）at Util.ConnectionDB.openConnection（ConnectionDB.java:30）at Controller.Main.testConnection（Main.java:23）at Controller.Main.start（Main.java:18）at com.sun.javafx.application.LauncherImpl.lambda $ launchApplication1 $ 163（LauncherImpl.java:863）在 com.sun.javafx.application.PlatformImpl.lambda $ runAndWait $ 176（PlatformImpl.java:326）在 com.sun.javafx.application.PlatformImpl.lambda为$ null $ 174（PlatformImpl.java:295）在java.security.AccessController.doPrivileged（Native Method）at com.sun.javafx.application.PlatformImpl.lambda $ runLater $ 175（PlatformImpl.java:294）在 com.sun.glass.ui.InvokeLaterDispatcher $ Future.run（InvokeLaterDispatcher.java:95） at com.sun.glass.ui.win.WinApplication._runLoop（Native Method）at com.sun.glass.ui.win.WinApplication.lambda为$ null $ 149（WinApplication.java:191）在java.lang.Thread.run（Thread.java:745）引起： oracle.net.ns.NetException：网络适配器无法建立连接在 oracle.net.nt.ConnStrategy.execute（ConnStrategy.java:439）at oracle.net.resolver.AddrResolution.resolveAndExecute（AddrResolution.java:454） at oracle.net.ns.NSProtocol.establishConnection（NSProtocol.java:693）在oracle.net.ns.NSProtocol.connect（NSProtocol.java:251）at oracle.jdbc.driver.T4CConnection.connect（T4CConnection.java:1140）at at oracle.jdbc.driver.T4CConnection.logon（T4CConnection.java:340）... 18 更多引起：java.net.ConnectException：连接被拒绝：连接 at java.net.DualStackPlainSocketImpl.waitForConnect（Native Method）在 java.net.DualStackPlainSocketImpl.socketConnect（DualStackPlainSocketImpl.java:85）在 java.net.AbstractPlainSocketImpl.doConnect（AbstractPlainSocketImpl.java:350）在 java.net.AbstractPlainSocketImpl.connectToAddress（AbstractPlainSocketImpl.java:206）在 java.net.AbstractPlainSocketImpl.connect（AbstractPlainSocketImpl.java:188）在java.net.PlainSocketImpl.connect（PlainSocketImpl.java:172）at java.net.SocksSocketImpl.connect（SocksSocketImpl.java:392）at java.net.Socket.connect（Socket.java:589）at oracle.net.nt.TcpNTAdapter.connect（TcpNTAdapter.java:149）at at oracle.net.nt.ConnOption.connect（ConnOption.java:133）at oracle.net.nt.ConnStrategy.execute（ConnStrategy.java:405）

无法使用JAVAFX和Oracle DB

0 个答案: