随机生成优惠码并保存至Mysql数据库

目前很多商家通过优惠码做活动，现在我们简单的实现八位的优惠码，并保存在数据库中。
1.随机生成优惠码代码如下：

import java.util.Random;/***功能：随机生成优惠码*@author iamwiam**/public class Activatedcode {    public int ACTIVATEDCODENUM = 200; //生成的优惠码数量    Random random = new Random();    String candicatedCode = "abcedefghijklmnopqrstuvwxyz";//优惠码包含小写字母    candicatedCode+=candicatedCode.toUpperCase()；//优惠码包含大写字母    candicatedCode+="1234567890";//优惠码包含阿拉伯数字    for(int i=0; i< ACTIVATEDCODENUM;i++){        String res ="";        for(int j=0;j<8;j++){            res+=candicatedCode.charAt(random.nextInt(candicatedCode.lenght()));        }        System.out.println(res);//随机生成200个8位的优惠码    }}

2.将优惠码保存在数据库中

private static void insertToMySql(String res){
int n = 0;
try{
Class.forName(“com.mysql.jdbc.Driver”);
Connection connection = DriverMannager.getConnection(“jdbc:mysql://127.0.0.1/tb_act_code”,”zy”,”IamWiam”);
String sql = “insert into checkNum(value) values(?)”;
PreparedStatement ps = connection.prepareStatement(sql);
ps.setObject(1,res); //占位符顺序从1开始，第一个参数是占位符的位置，第二个参数是占位符的值
n = ps.executeUpdate();
}catch(ClassNotFoundException e){
e.printStackTrace();
}catch(SQLException e){
e.printStackTrace();
}
}

3.整合

import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.SQLException;import java.util.Random;/** * 功能：随机生成优惠码 * @author iamwiam * */public class Activatedcode {    public static void main(String[] args) {        final int ACTIVATEDCODENUM = 200;        Random random = new Random();        String candicatedCode = "abcdefghijklmnopqrstuvwxyz";        candicatedCode+=candicatedCode.toUpperCase();        candicatedCode+="1234567890";        for(int i=0;i<ACTIVATEDCODENUM;i++){            String res ="";            for(int j=0;j<8;j++){                res+=candicatedCode.charAt(random.nextInt(candicatedCode.length()));            }//          String pwd = Activatedcode.getMD5(Activatedcode.getMD5(res));            insertToMysql(res);        }    }    private static void insertToMysql(String res) {        int n=0;        try {            Class.forName("com.mysql.jdbc.Driver");            Connection connection = DriverManager.getConnection(                    "jdbc:mysql://127.0.0.1/new2017", "zy", "IamWiam");            String sql = "insert into checkNum(value) values(?)";            PreparedStatement ps = connection.prepareStatement(sql);            ps.setObject(1, res);            n = ps.executeUpdate();        } catch (ClassNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (SQLException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}

4.结果如下