不同進位的數字字串互相轉換

1.import java.io.ByteArrayInputStream;<br />2.import java.io.ByteArrayOutputStream;<br />3.import java.io.IOException;<br />4.import java.io.ObjectInputStream;<br />5.import java.io.ObjectOutputStream;<br />6.import java.io.Serializable;<br />7.import java.security.MessageDigest;<br />8.import java.security.NoSuchAlgorithmException;<br />9.<br />10.public final class Converts {<br />11.<br />12. public final static char[] BToA = "0123456789abcdef".toCharArray() ;<br />13. private Converts() {<br />14. }<br />15.<br />16. /**<br />17. * 把16進位字串轉換成位元組數組<br />18. * @param hex<br />19. * @return<br />20. */<br />21. public static byte[] hexStringToByte(String hex) {<br />22. int len = (hex.length() / 2);<br />23. byte[] result = new byte[len];<br />24. char[] achar = hex.toCharArray();<br />25. for (int i = 0; i < len; i++) {<br />26. int pos = i * 2;<br />27. result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));<br />28. }<br />29. return result;<br />30. }<br />31.<br />32. private static byte toByte(char c) {<br />33. byte b = (byte) "0123456789ABCDEF".indexOf(c);<br />34. return b;<br />35. }<br />36.<br />37. /**<br />38. * 把位元組數群組轉換成16進位字串<br />39. * @param bArray<br />40. * @return<br />41. */<br />42. public static final String bytesToHexString(byte[] bArray) {<br />43. StringBuffer sb = new StringBuffer(bArray.length);<br />44. String sTemp;<br />45. for (int i = 0; i < bArray.length; i++) {<br />46. sTemp = Integer.toHexString(0xFF & bArray[i]);<br />47. if (sTemp.length() < 2)<br />48. sb.append(0);<br />49. sb.append(sTemp.toUpperCase());<br />50. }<br />51. return sb.toString();<br />52. }<br />53.<br />54. /**<br />55. * 把位元組數群組轉換為對象<br />56. * @param bytes<br />57. * @return<br />58. * @throws IOException<br />59. * @throws ClassNotFoundException<br />60. */<br />61. public static final Object bytesToObject(byte[] bytes) throws IOException, ClassNotFoundException {<br />62. ByteArrayInputStream in = new ByteArrayInputStream(bytes);<br />63. ObjectInputStream oi = new ObjectInputStream(in);<br />64. Object o = oi.readObject();<br />65. oi.close();<br />66. return o;<br />67. }<br />68.<br />69. /**<br />70. * 把可序列化對象轉換成位元組數組<br />71. * @param s<br />72. * @return<br />73. * @throws IOException<br />74. */<br />75. public static final byte[] objectToBytes(Serializable s) throws IOException {<br />76. ByteArrayOutputStream out = new ByteArrayOutputStream();<br />77. ObjectOutputStream ot = new ObjectOutputStream(out);<br />78. ot.writeObject(s);<br />79. ot.flush();<br />80. ot.close();<br />81. return out.toByteArray();<br />82. }<br />83.<br />84. public static final String objectToHexString(Serializable s) throws IOException{<br />85. return bytesToHexString(objectToBytes(s));<br />86. }<br />87.<br />88. public static final Object hexStringToObject(String hex) throws IOException, ClassNotFoundException{<br />89. return bytesToObject(hexStringToByte(hex));<br />90. }<br />91.<br />92. /**<br />93. * @函數功能: BCD碼轉為10進位串(阿拉伯資料)<br />94. * @輸入參數: BCD碼<br />95. * @輸出結果: 10進位串<br />96. */<br />97. public static String bcd2Str(byte[] bytes){<br />98. StringBuffer temp=new StringBuffer(bytes.length*2);<br />99.<br />100. for(int i=0;i<bytes.length;i++){<br />101. temp.append((byte)((bytes[i]& 0xf0)>>>4));<br />102. temp.append((byte)(bytes[i]& 0x0f));<br />103. }<br />104. return temp.toString().substring(0,1).equalsIgnoreCase("0")?temp.toString().substring(1):temp.toString();<br />105. }<br />106.<br />107. /**<br />108. * @函數功能: 10進位串轉為BCD碼<br />109. * @輸入參數: 10進位串<br />110. * @輸出結果: BCD碼<br />111. */<br />112. public static byte[] str2Bcd(String asc) {<br />113. int len = asc.length();<br />114. int mod = len % 2;<br />115.<br />116. if (mod != 0) {<br />117. asc = "0" + asc;<br />118. len = asc.length();<br />119. }<br />120.<br />121. byte abt[] = new byte[len];<br />122. if (len >= 2) {<br />123. len = len / 2;<br />124. }<br />125.<br />126. byte bbt[] = new byte[len];<br />127. abt = asc.getBytes();<br />128. int j, k;<br />129.<br />130. for (int p = 0; p < asc.length()/2; p++) {<br />131. if ( (abt[2 * p] >= '0') && (abt[2 * p] <= '9')) {<br />132. j = abt[2 * p] - '0';<br />133. } else if ( (abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) {<br />134. j = abt[2 * p] - 'a' + 0x0a;<br />135. } else {<br />136. j = abt[2 * p] - 'A' + 0x0a;<br />137. }<br />138.<br />139. if ( (abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) {<br />140. k = abt[2 * p + 1] - '0';<br />141. } else if ( (abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) {<br />142. k = abt[2 * p + 1] - 'a' + 0x0a;<br />143. }else {<br />144. k = abt[2 * p + 1] - 'A' + 0x0a;<br />145. }<br />146.<br />147. int a = (j << 4) + k;<br />148. byte b = (byte) a;<br />149. bbt[p] = b;<br />150. }<br />151. return bbt;<br />152. }<br />153.<br />154. public static String BCD2ASC(byte[] bytes) {<br />155. StringBuffer temp = new StringBuffer(bytes.length * 2);<br />156.<br />157. for (int i = 0; i < bytes.length; i++) {<br />158. int h = ((bytes[i] & 0xf0) >>> 4);<br />159. int l = (bytes[i] & 0x0f);<br />160. temp.append(BToA[h]).append( BToA[l]);<br />161. }<br />162. return temp.toString() ;<br />163. }<br />164.<br />165. /**<br />166. * MD5加密字串，返回加密後的16進位字串<br />167. * @param origin<br />168. * @return<br />169. */<br />170. public static String MD5EncodeToHex(String origin) {<br />171. return bytesToHexString(MD5Encode(origin));<br />172. }<br />173.<br />174. /**<br />175. * MD5加密字串，返回加密後的位元組數組<br />176. * @param origin<br />177. * @return<br />178. */<br />179. public static byte[] MD5Encode(String origin){<br />180. return MD5Encode(origin.getBytes());<br />181. }<br />182.<br />183. /**<br />184. * MD5加密位元組數組，返回加密後的位元組數組<br />185. * @param bytes<br />186. * @return<br />187. */<br />188. public static byte[] MD5Encode(byte[] bytes){<br />189. MessageDigest md=null;<br />190. try {<br />191. md = MessageDigest.getInstance("MD5");<br />192. return md.digest(bytes);<br />193. } catch (NoSuchAlgorithmException e) {<br />194. e.printStackTrace();<br />195. return new byte[0];<br />196. }<br />197.<br />198. }<br />199.}<br />200.<br />201.