首先当然要下载驱动，我用的是mysql-connector-java-5.0.4-bin.jar

public class ConnectionFactory {    
    public static Connection getConnection(){
        Connection conn =null;        
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn =DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/st_storm?useUnicode=true&characterEncoding=utf-8","root", "");
        } catch (ClassNotFoundException e) {
            System.out.println(" No class " + " found error"); e.printStackTrace();
        } catch (SQLException e) {
            System.out.println("Failed to get connection :" +e.getMessage()); e.printStackTrace();
        }
        System.out.println("conn=="+conn);
        return conn;
    }

st_storm是我要连接的库名