先建立一個java類UserMysql：

public class UserMysql {
	private static String url="jdbc:mysql://localhost:3306/‘資料庫名’";
	private static String username="使用者名稱";
	private static String password="使用者密碼";
	
	private static Connection connection=null;
	
	public static Connection getConnectionInstance() throws ClassNotFoundException, SQLException {
		
		if(null==connection) {
			Class.forName("com.mysql.jdbc.Driver");
			connection=DriverManager.getConnection(url,username,password);
			return connection;
		}else {
			return connection;
		}
	}
}
 

mysql架包下載地址：http://archive.apache.org/dist/commons/dbcp/binaries/
https://dev.mysql.com/downloads/connector/