string与十六进制byte互转

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/**

* 字符串转换成十六进制字符串

* @param String str 待转换的ASCII字符串

* @return String 每个Byte之间空格分隔，如: [61 6C 6B]

*/

public static String str2HexStr(String str)

{

char[] chars = "0123456789ABCDEF".toCharArray();

StringBuilder sb = new StringBuilder("");

byte[] bs = str.getBytes();

int bit;

for (int i = 0; i < bs.length; i++)

{

bit = (bs[i] & 0x0f0) >> 4;

sb.append(chars[bit]);

bit = bs[i] & 0x0f;

sb.append(chars[bit]);

sb.append(' ');

}

return sb.toString().trim();

}

/**

* 十六进制转换字符串

* @param String str Byte字符串(Byte之间无分隔符 如:[616C6B])

* @return String 对应的字符串

*/

public static String hexStr2Str(String hexStr)

{

String str = "0123456789ABCDEF";

char[] hexs = hexStr.toCharArray();

byte[] bytes = new byte[hexStr.length() / 2];

int n;

for (int i = 0; i < bytes.length; i++)

{

n = str.indexOf(hexs[2 * i]) * 16;

n += str.indexOf(hexs[2 * i + 1]);

bytes[i] = (byte) (n & 0xff);

}

return new String(bytes);

}

/**

* bytes转换成十六进制字符串

* @param byte[] b byte数组

* @return String 每个Byte值之间空格分隔

*/

public static String byte2HexStr(byte[] b)

{

String stmp="";

StringBuilder sb = new StringBuilder("");

for (int n=0;n<b.length;n++)

{

stmp = Integer.toHexString(b
& 0xFF);

sb.append((stmp.length()==1)? "0"+stmp : stmp);

sb.append(" ");

}

return sb.toString().toUpperCase().trim();

}

/**

* bytes字符串转换为Byte值

* @param String src Byte字符串，每个Byte之间没有分隔符

* @return byte[]

*/

public static byte[] hexStr2Bytes(String src)

{

int m=0,n=0;

int l=src.length()/2;

System.out.println(l);

byte[] ret = new byte[l];

for (int i = 0; i < l; i++)

{

m=i*2+1;

n=m+1;

ret[i] = Byte.decode("0x" + src.substring(i*2, m) + src.substring(m,n));

}

return ret;

}

/**

* String的字符串转换成unicode的String

* @param String strText 全角字符串

* @return String 每个unicode之间无分隔符

* @throws Exception

*/

public static String strToUnicode(String strText)

throws Exception

{

char c;

StringBuilder str = new StringBuilder();

int intAsc;

String strHex;

for (int i = 0; i < strText.length(); i++)

{

c = strText.charAt(i);

intAsc = (int) c;

strHex = Integer.toHexString(intAsc);

if (intAsc > 128)

str.append("\\u" + strHex);

else // 低位在前面补00

str.append("\\u00" + strHex);

}

return str.toString();

}

/**

* unicode的String转换成String的字符串

* @param String hex 16进制值字符串 （一个unicode为2byte）

* @return String 全角字符串

*/

public static String unicodeToString(String hex)

{

int t = hex.length() / 6;

StringBuilder str = new StringBuilder();

for (int i = 0; i < t; i++)

{

String s = hex.substring(i * 6, (i + 1) * 6);

// 高位需要补上00再转

String s1 = s.substring(2, 4) + "00";

// 低位直接转

String s2 = s.substring(4);

// 将16进制的string转为int

int n = Integer.valueOf(s1, 16) + Integer.valueOf(s2, 16);

// 将int转换为字符

char[] chars = Character.toChars(n);

str.append(new String(chars));

}

return str.toString();

}