Java & C# BCD编码与十进制转换

using System;
using System.Collections.Generic;
using System.Text;

namespace Base
{
public class BCDHelper
{
/// <summary>
/// 用BCD码压缩数字字符串
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static byte[] StrToBCD(string str)
{
return StrToBCD(str, str.Length);
}
public static byte[] StrToBCD(string str, int numlen)
{
while (str.Length < numlen)
{
str = "0" + str;
}
return ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes(str), 0, numlen);
}

/// <summary>
/// 用BCD码压缩数字字符串
/// </summary>
/// <param name="NumBitByte"></param>
/// <param name="offset">偏移量</param>
/// <param name="numlen">数字字符串位数</param>
/// <returns></returns>
/// <remarks></remarks>
public static byte[] ByteArrayToBCD(byte[] NumBitByte, int offset, int numlen)
{
//8位的ascii码
int Num4Len = (numlen + 1) / 2 - 1;
byte[] Num4bitByte = new byte[Num4Len + 1];
Num4bitByte[Num4Len] = 0;
for (int i = 0; i <= numlen - 1; i++)
{
byte num = 0;

if (i + offset >= NumBitByte.Length)
{
//num = 255;
num = 0;
}
else
{
num = Convert.ToByte(NumBitByte[i + offset] - 0x30);
}

if (i % 2 == 0)
{
Num4bitByte[i / 2] = Convert.ToByte((Num4bitByte[i / 2] & 0xf) | ((num << 4) & 0xFF));
}
else
{
Num4bitByte[i / 2] = Convert.ToByte((Num4bitByte[i / 2] & 0xf0) | num);
}
}

return Num4bitByte;
}
/// <summary>
/// BCD转int
/// </summary>
/// <param name="bcdNum"></param>
/// <param name="offset">偏移量</param>
/// <param name="numlen">数字字符串位数</param>
/// <returns></returns>
/// <remarks></remarks>
public static int bcdToInt(byte[] bcdNum, int offset, int numlen)
{
return Convert.ToInt32(bcdToString(bcdNum, offset, numlen));
}



/// <summary>
/// BCD转字符串
/// </summary>
/// <param name="bcdNum"></param>
/// <param name="offset">偏移量</param>
/// <param name="numlen">数字字符串位数</param>
/// <returns></returns>
/// <remarks></remarks>
public static string bcdToString(byte[] bcdNum, int offset, int numlen)
{
string retString = "";
int res;
var len = Math.DivRem(numlen, 2, out res);
if (res != 0)
{
len++;
}

for (int i = 0; i < len; i++)
{
retString += ((bcdNum[i + offset] & 0xf0) >> 4).ToString("x");
retString += (bcdNum[i + offset] & 0xf).ToString("x");
}



//Dim byteChar As Byte() = New Byte(length - 1) {}
//Dim tempHigh As Byte = 0, tempLow As Byte = 0
//Dim i As Integer = 0
//While tempHigh <> &HF AndAlso tempLow <> &HF0
// tempHigh = Convert.ToByte(bcdNum(i + offset) And &HF0)
// '取出高四位；
// tempHigh = Convert.ToByte(tempHigh >> 4)
// tempLow = Convert.ToByte((bcdNum(i + offset) And &HF) << 4)
// byteChar(i) = Convert.ToByte(tempLow Or tempHigh)
// i += 1
//End While
//Dim HexString As String() = BitConverter.ToString(byteChar).Trim().Split("-"c)
//For Each str As String In HexString
// retString += str.Trim()
//Next
//Dim LastIndex As Integer = retString.IndexOf("F"c)
//retString = retString.Substring(0, LastIndex)

return retString.ToLower().Replace("f", "");
}

/// <summary>
/// BCD码转小时分钟
/// date:2012-12-18
/// author:guozh
/// </summary>
/// <param name="data"></param>
/// <param name="offset">偏移位</param>
/// <returns></returns>
/// <remarks></remarks>
public static System.DateTime Bcd2ToDateTime(byte[] data, int offset)
{
Int32 hour = default(Int32);
Int32 minute = default(Int32);
hour = Convert.ToInt32(bcdToString(data, offset, 2));
minute = Convert.ToInt32(bcdToString(data, offset + 1, 2));
return new System.DateTime(0000, 00, 00, hour, minute, 00);
}

/// <summary>
/// BCD码转日期
/// </summary>
/// <param name="data"></param>
/// <param name="offset">偏移位</param>
/// <returns></returns>
/// <remarks></remarks>
public static System.DateTime Bcd3ToDateTime(byte[] data, int offset)
{
Int32 year = default(Int32);
Int32 month = default(Int32);
Int32 day = default(Int32);
year = Convert.ToInt32("20" + bcdToString(data, offset, 2));
month = Convert.ToInt32(bcdToString(data, offset + 1, 2));
day = Convert.ToInt32(bcdToString(data, offset + 2, 2));
if (day == 0 || month == 0)
{
return DateTime.MinValue;
}
return new System.DateTime(year, month, day);
}
public static System.DateTime Bcd4ToDateTime(byte[] data, int offset)
{
Int32 year = default(Int32);
Int32 month = default(Int32);
Int32 day = default(Int32);
try
{
year = Convert.ToInt32(bcdToString(data, offset, 4));
month = Convert.ToInt32(bcdToString(data, offset + 2, 2));
day = Convert.ToInt32(bcdToString(data, offset + 3, 2));
}
catch
{
}
if (day == 0 || month == 0)
{
return DateTime.MinValue;
}
return new System.DateTime(year, month, day);
}
public static System.DateTime Bcd5ToDateTime(byte[] data, int offset)
{
var year = Convert.ToInt32("20" + bcdToString(data, offset, 2));
var month = Convert.ToInt32(bcdToString(data, offset + 1, 2));
var day = Convert.ToInt32(bcdToString(data, offset + 2, 2));
var hour = Convert.ToInt32(bcdToString(data, offset + 3, 2));
var minute = Convert.ToInt32(bcdToString(data, offset + 4, 2));
if (day == 0 || month == 0)
{
return DateTime.MinValue;
}
return new DateTime(year, month, day, hour, minute, 0);
}
/// <summary>
/// BCD码转时间格式
/// </summary>
/// <param name="data"></param>
/// <param name="offset">偏移位</param>
/// <returns></returns>
/// <remarks></remarks>
public static System.DateTime Bcd6ToDateTime(byte[] data, int offset)
{
try
{
if (data.Length < offset + 6)
{
return DateTime.MinValue;
}
int year;// = Convert.ToInt32("20" + bcdToString(data, offset, 2));
if (!int.TryParse("20" + bcdToString(data, offset, 2), out year))
{
return DateTime.MinValue;
}
int month;// = Convert.ToInt32(bcdToString(data, offset + 1, 2));
if (!int.TryParse(bcdToString(data, offset + 1, 2), out month))
{
return DateTime.MinValue;
}
int day;// = Convert.ToInt32(bcdToString(data, offset + 2, 2));
if (!int.TryParse(bcdToString(data, offset + 2, 2), out day))
{
return DateTime.MinValue;
}
int hour;// = Convert.ToInt32(bcdToString(data, offset + 3, 2));
if (!int.TryParse(bcdToString(data, offset + 3, 2), out hour))
{
return DateTime.MinValue;
}
int minute;// = Convert.ToInt32(bcdToString(data, offset + 4, 2));
if (!int.TryParse(bcdToString(data, offset + 4, 2), out minute))
{
return DateTime.MinValue;
}
int second;// = Convert.ToInt32(bcdToString(data, offset + 5, 2));
if (!int.TryParse(bcdToString(data, offset + 5, 2), out second))
{
return DateTime.MinValue;
}
if (day == 0 || month == 0 || month > 12 || day > 31 || hour > 24 || minute > 60 || second > 60)
{
return DateTime.MinValue;
}
return new DateTime(year, month, day, hour, minute, second);
}
catch
{
return DateTime.MinValue;
}
}
/// <summary>
///
/// </summary>
/// <param name="data"></param>
/// <param name="offset"></param>
/// <returns></returns>
public static System.DateTime Bcd7ToDateTime(byte[] data, int offset)
{

var year = Convert.ToInt32(bcdToString(data, offset, 4));
var month = Convert.ToInt32(bcdToString(data, offset + 2, 2));
var day = Convert.ToInt32(bcdToString(data, offset + 3, 2));
var hour = Convert.ToInt32(bcdToString(data, offset + 4, 2));
var minute = Convert.ToInt32(bcdToString(data, offset + 5, 2));
var second = Convert.ToInt32(bcdToString(data, offset + 6, 2));
if (day == 0 || month == 0 || year == 0)
{
return DateTime.MinValue;
}
return new DateTime(year, month, day, hour, minute, second);
}
/// <summary>
/// 小时分钟转BCD码
/// date:2012-12-18
/// author:guozh
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
/// <remarks></remarks>
public static byte[] DateTimeToBcd2(System.DateTime dt)
{
List<byte> lst = new List<byte>();
//StringBuilder sb = new StringBuilder();
//sb.Append(dt.Hour.ToString("D2"));
//sb.Append(dt.Minute.ToString("D2"));
lst.AddRange(StrToBCD(dt.ToString("HHmm")));
return lst.ToArray();
}
/// <summary>
/// 日期转BCD码
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
/// <remarks></remarks>
public static byte[] DateTimeToBcd3(System.DateTime dt)
{

List<byte> lst = new List<byte>();

//StringBuilder sb = new StringBuilder();
//sb.Append((dt.Year - 2000).ToString("D2"));
//sb.Append(dt.Month.ToString("D2"));
//sb.Append(dt.Day.ToString("D2"));
lst.AddRange(StrToBCD(dt.ToString("yyMMdd")));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Year - 2000).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Month).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Day).ToString()), 0, 2));

return lst.ToArray();
}
public static byte[] DateTimeToBcd4(System.DateTime dt)
{
List<byte> lst = new List<byte>();
StringBuilder sb = new StringBuilder();
sb.Append((dt.Year).ToString("D4"));
sb.Append(dt.Month.ToString("D2"));
sb.Append(dt.Day.ToString("D2"));
lst.AddRange(StrToBCD(sb.ToString()));
return lst.ToArray();
}
public static byte[] DateTimeToBcd5(System.DateTime dt)
{
List<byte> lst = new List<byte>();
var strTime = dt.ToString("yyMMddHHmm");
lst.AddRange(StrToBCD(strTime));

//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Year - 2000).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Month).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Day).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Hour).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Minute).ToString()), 0, 2));
return lst.ToArray();
}
public static byte[] DateTimeToBcd6(System.DateTime dt)
{
try
{
List<byte> lst = new List<byte>();
var strTime = dt.ToString("yyMMddHHmmss");
lst.AddRange(StrToBCD(strTime));

//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Year - 2000).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Month).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Day).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Hour).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Minute).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Second).ToString()), 0, 2));

return lst.ToArray();
}
catch (System.Exception ex)
{

return new byte[] { 0, 0, 0, 0, 0, 0 };
}
}
public static byte[] DateTimeToBcd7(System.DateTime dt)
{
List<byte> lst = new List<byte>();


StringBuilder sb = new StringBuilder();
sb.Append(dt.Year.ToString("D4"));
sb.Append(dt.Month.ToString("D2"));
sb.Append(dt.Day.ToString("D2"));
sb.Append(dt.Hour.ToString("D2"));
sb.Append(dt.Minute.ToString("D2"));
sb.Append(dt.Second.ToString("D2"));
lst.AddRange(StrToBCD(sb.ToString()));

//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes(dt.Year.ToString()), 0, 4));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Month).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Day).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Hour).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Minute).ToString()), 0, 2));
//lst.AddRange(ByteArrayToBCD(System.Text.Encoding.ASCII.GetBytes((dt.Second).ToString()), 0, 2));

return lst.ToArray();
}
}
}
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作者：boonya
来源：CSDN
原文：https://blog.csdn.net/boonya/article/details/83537827