Java Connexion à la base de données MySQL à distance

Question

Hey les gars Im essayant de se connecter à ma base de données distante mysql et mon code me donne cette erreur:

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver 
at java.net.URLClassLoader$1.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.net.URLClassLoader.findClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at java.lang.Class.forName0(Native Method) 
at java.lang.Class.forName(Unknown Source) 
at Login.login(Login.java:116) 
at Login.actionPerformed(Login.java:97) 
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)Logging in with credintials (wqdq, dqww) 

at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) 
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) 
at javax.swing.DefaultButtonModel.setPressed(Unknown Source) 
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) 
at java.awt.Component.processMouseEvent(Unknown Source) 
at javax.swing.JComponent.processMouseEvent(Unknown Source) 
at java.awt.Component.processEvent(Unknown Source) 
at java.awt.Container.processEvent(Unknown Source) 
at java.awt.Component.dispatchEventImpl(Unknown Source) 
at java.awt.Container.dispatchEventImpl(Unknown Source) 
at java.awt.Component.dispatchEvent(Unknown Source) 
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) 
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) 
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) 
at java.awt.Container.dispatchEventImpl(Unknown Source) 
at java.awt.Window.dispatchEventImpl(Unknown Source) 
at java.awt.Component.dispatchEvent(Unknown Source) 
at java.awt.EventQueue.dispatchEvent(Unknown Source) 
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
at java.awt.EventDispatchThread.run(Unknown Source) 

Voici mon code:

  Connection conn = null; 

     try 
     { 

      String url = "jdbc:mysql://myhost:3306/mydb"; 
      Class.forName ("com.mysql.jdbc.Driver"); 
      conn = DriverManager.getConnection (url,"myuser","mypass"); 
      System.out.println ("Database connection established"); 
     } 
     catch (Exception e) 
     { 
      e.printStackTrace(); 

     } 
     finally 
     { 
      if (conn != null) 
      { 
       try 
       { 
        conn.close(); 
        System.out.println ("Database connection terminated"); 
       } 
       catch (Exception e) { /* ignore close errors */ } 
      } 
     } 

Answer 1

Vous devez ajouter le pilote JDBC Connector J pour la base de données Mysql à mysql-Downloads à votre classpath. Vous pouvez suivre les instructions sur l'ajout des jars externes à Eclipse here en accédant à project properties->Java Build Path -> Libraries->Add External JARs

Answer 2

Ce poste devrait réponds à tes questions http://www.vogella.de/articles/MySQLJava/article.html Vous pouvez obtenir les de http://www.mysql.com/products/connector/

Answer 3

fichiers jar mysql nécessaires Comme le souligne Dave dehors, la première chose est de vérifier si un pot contenant la classe com.mysql.jdbc.Driver est parmi vos autres bibliothèques.

Si non, ajoutez-le.