Java Hex 16进制的 byte String 转换类

转自：http://blog.csdn.net/hzbigdog/article/details/6877712

package mobi.dzs.android.util;



import java.util.Locale;



/**

* 16进制值与String/Byte之间的转换

* @author JerryLi

* @email lijian@dzs.mobi

* @data 2011-10-16

* */

public class CHexConver

{

private final static char[] mChars = "0123456789ABCDEF".toCharArray();

private final static String mHexStr = "0123456789ABCDEF";

/**

* 检查16进制字符串是否有效

* @param sHex String 16进制字符串

* @return boolean

*/

public static boolean checkHexStr(String sHex){

String sTmp = sHex.toString().trim().replace(" ", "").toUpperCase(Locale.US);

int iLen = sTmp.length();



if (iLen > 1 && iLen%2 == 0){

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

if (!mHexStr.contains(sTmp.substring(i, i+1)))

return false;

return true;

}

else

return false;

}



/**

* 字符串转换成十六进制字符串

* @param str String 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){

StringBuilder sb = new StringBuilder();

byte[] bs = str.getBytes();



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

sb.append(mChars[(bs[i] & 0xFF) >> 4]);

sb.append(mChars[bs[i] & 0x0F]);

sb.append(' ');

}

return sb.toString().trim();

}



/**

* 十六进制字符串转换成 ASCII字符串

* @param str String Byte字符串

* @return String 对应的字符串

*/

public static String hexStr2Str(String hexStr){

hexStr = hexStr.toString().trim().replace(" ", "").toUpperCase(Locale.US);

char[] hexs = hexStr.toCharArray();

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

int iTmp = 0x00;;



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

iTmp = mHexStr.indexOf(hexs[2 * i]) << 4;

iTmp |= mHexStr.indexOf(hexs[2 * i + 1]);

bytes[i] = (byte) (iTmp & 0xFF);

}

return new String(bytes);

}



/**

* bytes转换成十六进制字符串

* @param b byte[] byte数组

* @param iLen int 取前N位处理 N=iLen

* @return String 每个Byte值之间空格分隔

*/

public static String byte2HexStr(byte[] b, int iLen){

StringBuilder sb = new StringBuilder();

for (int n=0; n<iLen; n++){

sb.append(mChars[(b
& 0xFF) >> 4]);

sb.append(mChars[b
& 0x0F]);

sb.append(' ');

}

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

}



/**

* bytes字符串转换为Byte值

* @param src String Byte字符串，每个Byte之间没有分隔符(字符范围:0-9 A-F)

* @return byte[]

*/

public static byte[] hexStr2Bytes(String src){

/*对输入值进行规范化整理*/

src = src.trim().replace(" ", "").toUpperCase(Locale.US);

//处理值初始化

int m=0,n=0;

int iLen=src.length()/2; //计算长度

byte[] ret = new byte[iLen]; //分配存储空间



for (int i = 0; i < iLen; i++){

m=i*2+1;

n=m+1;

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

}

return ret;

}



/**

* String的字符串转换成unicode的String

* @param strText String 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");

else // 低位在前面补00

str.append("\\u00");

str.append(strHex);

}

return str.toString();

}



/**

* unicode的String转换成String的字符串

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

* @return String 全角字符串

* @see CHexConver.unicodeToString("\\u0068\\u0065\\u006c\\u006c\\u006f")

*/

public static String unicodeToString(String hex){

int t = hex.length() / 6;

int iTmp = 0;

StringBuilder str = new StringBuilder();

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

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

// 将16进制的string转为int

iTmp = (Integer.valueOf(s.substring(2, 4), 16) << 8) | Integer.valueOf(s.substring(4), 16);

// 将int转换为字符

str.append(new String(Character.toChars(iTmp)));

}

return str.toString();

}

}