JAVA的格式转换函数
因为所在的行业经常需要用到各种格式的报文，经常需要在各种格式之间转换，把用到过的函数都集中整理放到一起，方便以后可以直接用
//String转BCD编码字符数组，String=”1234567890ABCDEF”转换为byte[]={0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF}
public static byte[] str2Bcd(String asc){int len = asc.length();int mod = len % 2;if (mod != 0){asc = “0” + asc;len = asc.length();}byte abt[] = new byte[len];if (len >= 2){len = len / 2;}byte bbt[] = new byte[len];abt = asc.getBytes();int j, k;for (int p = 0; p < asc.length() / 2; p++){if ((abt[2 * p] >= ‘0’) && (abt[2 * p] <= ‘9’)){j = abt[2 * p] – ‘0’;}else if ((abt[2 * p] >= ‘a’) && (abt[2 * p] <= ‘z’)){j = abt[2 * p] – ‘a’ + 0x0a;}else{j = abt[2 * p] – ‘A’ + 0x0a;}if ((abt[2 * p + 1] >= ‘0’) && (abt[2 * p + 1] <= ‘9’)){k = abt[2 * p + 1] – ‘0’;}else if ((abt[2 * p + 1] >= ‘a’) && (abt[2 * p + 1] <= ‘z’)){k = abt[2 * p + 1] – ‘a’ + 0x0a;}else{k = abt[2 * p + 1] – ‘A’ + 0x0a;}int a = (j << 4) + k;byte b = (byte) a;bbt[p] = b;System.out.format(“%02X\n”, bbt[p]);}return bbt;}
//BCD编码字符数组转换为String字符串
public static String bcd2Str(byte[] bytes){char temp[] = new char[bytes.length * 2], val;for (int i = 0; i < bytes.length; i++){val = (char) (((bytes[i] & 0xf0) >> 4) & 0x0f);temp[i * 2] = (char) (val > 9 ? val + ‘A’ – 10 : val + ‘0’);val = (char) (bytes[i] & 0x0f);temp[i * 2 + 1] = (char) (val > 9 ? val + ‘A’ – 10 : val + ‘0’);}return new String(temp);}
//ASCII字符转换BCD编码字符
public static byte asc_to_bcd(byte asc){byte bcd;if ((asc >= ‘0’) && (asc <= ‘9’))bcd = (byte) (asc – ‘0’);else if ((asc >= ‘A’) && (asc <= ‘F’))bcd = (byte) (asc – ‘A’ + 10);else if ((asc >= ‘a’) && (asc <= ‘f’))bcd = (byte) (asc – ‘a’ + 10);elsebcd = (byte) (asc – 48);return bcd;}
//ASCII字符数组转换为BCD编码格式数组
public static byte[] ASCII_To_BCD(byte[] ascii, int asc_len){byte[] bcd = new byte[asc_len / 2];int j = 0;for (int i = 0; i < (asc_len + 1) / 2; i++){bcd[i] = asc_to_bcd(ascii[j++]);bcd[i] = (byte) (((j >= asc_len) ? 0x00 : asc_to_bcd(ascii[j++])) + (bcd[i] << 4));System.out.format(“%02X\n”, bcd[i]);}return bcd;}
//char数组转换为Byte数组
//char[] to byte[]
public byte[] char2byte (char[] chars)
{
Charset cs = Charset.forName ("UTF-8");
CharBuffer cb = CharBuffer.allocate (chars.length);
cb.put (chars);
cb.flip ();
ByteBuffer bb = cs.encode (cb);
return bb.array();
}
//byte数组转换为char数组
//byte[] to char[]
public char[] byte2char (byte[] bytes)
{
Charset cs = Charset.forName ("UTF-8");
ByteBuffer bb = ByteBuffer.allocate (bytes.length);
bb.put (bytes);
bb.flip ();
CharBuffer cb = cs.decode (bb);
return cb.array();
}
//将二进制byte字符串转换为string,bin to hex
//byte[] to string
public static String bin2hex(byte[] b)
{
// using the default system Locale
Locale defloc = Locale.getDefault();
String str = "";
for (int i = 0; i < b.length; i++) {
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
if (i > 0)
if ((i % 16 == 0)) {
str += "\n";
} else if ((i % 8 == 0)) {
str += " - ";
} else {
str += " ";
}
str += hex.toUpperCase(defloc);
}
return str;
}
//将Byte[]与hex字符串相互转换
private final static byte[] hex = "0123456789ABCDEF".getBytes();
private static int parse(char c) {
if (c >= 'a')
return (c - 'a' + 10) & 0x0f;
if (c >= 'A')
return (c - 'A' + 10) & 0x0f;
return (c - '0') & 0x0f;
}
/**
* 从字节数组到十六进制字符串转换
* @param b bytes buffer
* @return convert result
*/
public static String Bytes2HexString(byte[] b) {
byte[] buff = new byte[2 * b.length];
for (int i = 0; i < b.length; i++) {
buff[2 * i] = hex[(b[i] >> 4) & 0x0f];
buff[2 * i + 1] = hex[b[i] & 0x0f];
}
return new String(buff);
}
/**
* 从十六进制字符串到字节数组转换
* @param hexstr 16进制显示的字符串
* @return convert result
*/
public static byte[] HexString2Bytes(String hexstr) {
byte[] b = new byte[hexstr.length() / 2];
int j = 0;
for (int i = 0; i < b.length; i++) {
char c0 = hexstr.charAt(j++);
char c1 = hexstr.charAt(j++);
b[i] = (byte) ((parse(c0) << 4) | parse(c1));
}
return b;
}
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