修改

Question

我尝试从服务器在客户端计算机上执行java应用程序。但应用程序，当我尝试打开这个，而不是exetecute。在这里我的课堂Conexion：

package Conexion;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JOptionPane;
public class Conexion {   
    private static final String database = "recursos_humanos";
    private static final String login = "root";
    private static final String password = "1234";
    private static final String url = "jdbc:mysql://localhost:3306/"+database;

    public static Connection connection;
    public static Statement stm;
    public static ResultSet rs;
    public static PreparedStatement ps;

    public static Connection getConnection(){
        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection(url,login,password);                      
            if(connection != null)
                System.out.println("Base de Datos " +database +" lista.");
        } catch (ClassNotFoundException  ex) {
            System.out.println(ex);
            JOptionPane.showMessageDialog(null, "No se pudo coenctar: "+ex);
        }catch(SQLException ex){System.out.println(ex);}
        return connection;
    }
}

请帮帮我，谢谢。

修改

我做了更改，我擦除＆＃34; String url =＆＃34; jdbc：mysql：// localhost：3306 /＆＃34; + database;＆＃34;

并输入服务器的IP地址; ＆＃34; String url =＆＃34; jdbc：mysql：//10.6.12.247：3306 /＆＃34; + database;＆＃34;但结果如下：

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: 

** BEGIN NESTED EXCEPTION ** 

java.net.ConnectException
MESSAGE: Connection timed out: connect

STACKTRACE:

java.net.ConnectException: Connection timed out: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at Ventanas.VentanaPrincipal.listar(VentanaPrincipal.java:387)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at Ventanas.VentanaPrincipal.<init>(VentanaPrincipal.java:76)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at Ventanas.VentanaPrincipal$11.run(VentanaPrincipal.java:356)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
    at java.net.Socket.connect(Socket.java:538)
    at java.awt.EventQueue.access$400(EventQueue.java:97)
    at java.net.Socket.<init>(Socket.java:434)
    at java.awt.EventQueue$3.run(EventQueue.java:697)
    at java.net.Socket.<init>(Socket.java:244)
    at java.awt.EventQueue$3.run(EventQueue.java:691)
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:271)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2771)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.sql.DriverManager.getConnection(DriverManager.java:664)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.sql.DriverManager.getConnection(DriverManager.java:247)
    at Conexion.Conexion.getConnection(Conexion.java:34)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at Ventanas.VentanaPrincipal.listar(VentanaPrincipal.java:385)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
    at Ventanas.VentanaPrincipal.<init>(VentanaPrincipal.java:76)
    at Ventanas.VentanaPrincipal$11.run(VentanaPrincipal.java:356)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
    at java.awt.EventQueue.access$400(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:697)
    at java.awt.EventQueue$3.run(EventQueue.java:691)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)


** END NESTED EXCEPTION **



Last packet sent to the server was 1 ms ago.

请告诉我。谢谢＆＃39; S。

Answer 1

你的错误就在这里。

private static final String url = "jdbc:mysql://localhost:3306/"+database;

Localhost是运行应用程序的计算机，在本例中是客户端计算机。为了实际连接到服务器，服务器的IP必须代替“localhost”。正确的实施如下所示：

String ServerAddress = "192.168.1.4";
private static final String url = "jdbc:mysql://" + ServerAddress + ":3306/"+database;

此致

Answer 2

您的应用程序正在尝试建立与localhost的jdbc连接，但肯定没有运行mysql

只需更改您的代码，如下所示：

url =“jdbc：mysql：// IPofYourServer：3306 /”+ database;

●将localhost替换为代码中服务器的IP地址。

Answer 3

只需使用您的服务器名称更改该localhost即可。但请确保您的数据库必须驻留在该服务器上。

如何从服务器在客户端计算机中执行java应用程序？

修改

3 个答案: