java無法連接到jdbc

我想用JDBC使用Java建立與MySQL數據庫的連接。java無法連接到jdbc

但是，當我嘗試做到這一點，我得到一些錯誤。我敢肯定，這個問題並不是因爲MySQL服務器設置錯誤，因爲我試圖與MySQL Workbench連接，並且這可以工作。

我用這個Java代碼來設置德JDBC連接：

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.SQLException; 


public class SQLConnection { 

    public static SQLConnection instance = new SQLConnection(); 
    public static String URL = "jdbc:mysql://localhost:3306/canbusdata"; 
    public static String USER= "root"; 
    public static String PSW = "root"; 

    public SQLConnection() 
    { 
    } 

    public static Connection getConnection() { 
     System.out.println("-------- MySQL JDBC Connection ------------\n"); 

     try { 
      Class.forName("com.mysql.jdbc.Driver"); 
     } catch (ClassNotFoundException e) { 
      System.out.println("Where is your MySQL JDBC Driver?"); 
      e.printStackTrace(); 

     } 
     System.out.println("MySQL JDBC Driver Registered!"); 
     Connection connection = null; 

     try { 
      connection = DriverManager.getConnection(URL,USER,PSW); 

     } catch (SQLException e) { 
      System.out.println("Connection Failed! Check output console: \n"); 
      e.printStackTrace(); 

     } 

     return connection; 
    } 
}

但我得到這個錯誤：

-------- MySQL JDBC Connection ------------ 

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver 
Where is your MySQL JDBC Driver? 
MySQL JDBC Driver Registered! 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366) 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355) 
Connection Failed! Check output console: 

    at java.security.AccessController.doPrivileged(Native Method) 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425) 
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358) 
    at java.lang.Class.forName0(Native Method) 
    at java.lang.Class.forName(Class.java:190) 
    at SQLConnection.getConnection(SQLConnection.java:21) 
    at Start.ProcessData(Start.java:109) 
    at Start.main(Start.java:21) 
java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/canbusdata 
    at java.sql.DriverManager.getConnection(DriverManager.java:596) 
    at java.sql.DriverManager.getConnection(DriverManager.java:215) 
    at SQLConnection.getConnection(SQLConnection.java:31) 
    at Start.ProcessData(Start.java:109) 
    at Start.main(Start.java:21) 
Exception in thread "main" java.lang.NullPointerException 
    at Start.ProcessData(Start.java:110) 
    at Start.main(Start.java:21) 
Java Result: 1

來源

2014-04-24 Kaj

檢查你的類路徑。你從哪裏運行：IDE或提示？ – jedison

如果您需要一些建議，請粘貼您的類路徑設置（pom或類似）。 – jedison

[Java連接與MySQL]可能的重複（http://stackoverflow.com/questions/2839321/java-connectivity-with-mysql） – demongolem