idmakerutil.java

一个完整的网络订餐系统

package com.util;

import java.util.*;

public class IDMakerUtil
{

  private int length;
  public String prefix;
  public String id;
  public String currentDate;

    public IDMakerUtil()
    {
        prefix = "";
        id = "NoChange";
        currentDate = null;
        prefix = "OD";
        length = 15;
    }

    public IDMakerUtil(int len, String prfx)
    {
        prefix = "";
        id = "NoChange";
        currentDate = null;
        length = len;
        prefix = prfx;
    }

    public void setLength(int len)
    {
        if(len < 13)
            length = 13;
        length = len;
    }

    public int getLength()
    {
        return length;
    }

    public String getPrefix()
    {
        return prefix;
    }

    public void setPrefix(String prfx)
    {
        if(prfx.length() > 2)
        {
            prefix = prfx.substring(0, 2);
            return;
        } else
        {
            prefix = prfx;
            return;
        }
    }

    public void setCurrentDate(String str)
    {
        currentDate = str;
    }

    public String getCurrentDate()
    {
        Calendar now = new GregorianCalendar();
        int year = now.get(1);
        int month = now.get(2) + 1;
        int date = now.get(5);
        return String.valueOf(String.valueOf((new StringBuffer("")).append(year).append("-").append(month).append("-").append(date)));
    }

    public String getId()
    {
        if(length < 13)
            return id;
        if(prefix.equals(""))
            prefix = "AA";
        if(prefix.length() > 2)
            prefix = prefix.substring(0, 2);
        if(prefix.length() < 2)
            prefix = String.valueOf(String.valueOf(prefix)).concat("A");
        if(length < 15)
            return less15();
        else
            return more15();
    }

    public void setId(String id)
    {
        this.id = id;
    }

    private String less15()
    {
        Calendar now = new GregorianCalendar();
        Calendar from = new GregorianCalendar(2003, 2, 18);
        String tempID = "";
        Long millis = new Long(now.getTime().getTime() - from.getTime().getTime());
        tempID = millis.toString();
        int temp = tempID.length();
        for(int i = 0; i < 13 - temp; i++)
            tempID = String.valueOf(String.valueOf(tempID)).concat("0");

        tempID = tempID.substring(0, length - 2);
        return String.valueOf(prefix) + String.valueOf(tempID);
    }

    private String more15()
    {
        Calendar now = new GregorianCalendar();
        String tempID = "";
        int year = now.get(1);
        int month = now.get(2) + 1;
        int date = now.get(5);
        Long millis = new Long(now.getTime().getTime());
        tempID = millis.toString().substring(6, 13);
        if(date < 10)
            tempID = String.valueOf(String.valueOf((new StringBuffer("0")).append(date).append(tempID)));
        else
            tempID = String.valueOf(date) + String.valueOf(tempID);
        if(month < 10)
            tempID = String.valueOf(String.valueOf((new StringBuffer("0")).append(month).append(tempID)));
        else
            tempID = String.valueOf(month) + String.valueOf(tempID);
        tempID = String.valueOf(year) + String.valueOf(tempID);
        if(length < 18 && length >= 15)
            tempID = tempID.substring(17 - length, tempID.length());
        if(length >= 18)
        {
            for(int i = 0; i < length - 17; i++)
                tempID = String.valueOf(String.valueOf(tempID)).concat("0");

        }
        return String.valueOf(prefix) + String.valueOf(tempID);
    }

    public String getLess13ID(String prex,int nlen)
    {
      setPrefix(prex);
      setLength(nlen);
      return getId();
    }
}