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"";
            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