import java.sql.*;  import java.text.SimpleDateFormat;  import java.util.*;  import java.util.Date;  import java.text.*;  import java.util.Calendar;   public class conn {    public static void main(String[] args) {        conn  lm = new conn();        String t= lm.getStringDate();           try {                Class.forName("com.mysql.jdbc.Driver");     //加载MYSQL JDBC驱动程序                }          catch (Exception e) {                  e.printStackTrace();              }          try {                Connection connect = DriverManager.getConnection("jdbc:mysql://localhost:3307/student","root","zhangyabiao");                //连接URL为   jdbc:mysql//服务器地址/数据库名  ，后面的2个参数分别是登陆用户名和密码                System.out.println("["+t+"]"+"成功连接数据库!   ");                Statement stmt = connect.createStatement();                ResultSet rs = stmt.executeQuery("select * from zh");                //user 为你表的名称                while (rs.next()) {                    System.out.println(rs.getString("n")+". "+rs.getString("n1")+"  "+rs.getString("n2"));                      }                System.out.println("["+t+"]"+"成功获得数据");              }          catch (Exception e) {                System.out.print("["+t+"]"+"获得数据失败");                e.printStackTrace();              }            }      public static String getStringDate() {             Date currentTime = new Date();             SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");             String dateString = formatter.format(currentTime);             return dateString;      }    }

结果测试

/* [2017-05-08 22:05:48]成功连接数据库!   ......[2017-05-08 22:05:48]成功获得数据 出现上面结果，说明你连接数据库成功。 */