import java.sql.*;

public class MysqlJdbc {
  public static void main(String args[]) {
    try {
      Class.forName("org.gjt.mm.mysql.Driver");     //加载MYSQL JDBC驱动程序  
      System.out.println("Success loading Mysql Driver!");
    }
    catch (Exception e) {
      System.out.print("Error loading Mysql Driver!");
      e.printStackTrace();
    }

    try {
      Connection connect = DriverManager.getConnection(
          "jdbc:mysql://localhost/catmiw", "root", "");
//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("Success connect Mysql server!");

      Statement stmt = connect.createStatement();
      ResultSet rs = stmt.executeQuery("select * from pet");
      while (rs.next()) {
        System.out.println(rs.getString("name"));

      }
    }
    catch (Exception e) {
      System.out.print("get data error!");
      e.printStackTrace();
    }
  }
}

程序运行结果如下：
Success loading Mysql Driver!
Success connect Mysql server!
a dog