Java hexadecimal conversion helper classes (binary, decimal, hexadecimal, String, byte [] conversion)

Package COM. mas. FHK. util; import Java. io. bytearrayinputstream; import Java. io. bytearrayoutputstream; import Java. io. ioexception; import Java. io. objectinputstream; import Java. io. objectoutputstream; import Java. io. serializable; import Java. io. unsupportedencodingexception; import Java. security. messagedigest; import Java. security. nosuchalgorithmexception; import Java. text. simpledateformat; import Java. UT Il. calendar; import Java. util. date; import Java. util. gregoriancalendar; // The help class public class convertutil {public final static char [] btoa = "0123456789 abcdef ". tochararray (); Private convertutil () {} public static string getnowdate () {try {Java. util. calendar c = Java. util. calendar. getinstance (); Java. text. simpledateformat F = new Java. text. simpledateformat ("mm dd hh: mm"); Return F. format (C. gettime ());} Catch (exception e) {Throw E ;}} /*** convert the int value to a 4-digit hexadecimal format * @ Param S * @ return */public static string format4hex (int n) {try {string STR = integer. tohexstring (n); int Len = Str. length (); string hexstr = ""; for (INT I = Len; I <4; I ++) {if (I = Len) hexstr = "0 "; else hexstr = hexstr + "0";} return hexstr + Str. touppercase () ;}catch (exception e) {Throw e ;}/ *** convert binary to a hexadecimal string * @ Param binarystr * @ return */Public Static string bintohex (string binstr) {try {int Len = binstr. length ()/4; string res = ""; for (INT I = 0; I <Len; I ++) {char [] CH = new char [4]; binstr. getchars (I * 4, I * 4 + 4, ch, 0); Res = res + switchs (trans1 (CH);} return res;} catch (exception E) {Throw e ;}} public static int trans1 (char [] ch) {try {int sum = 0; For (INT I = 0; I <4; I ++) {int y = 8; If (CH [I] = '1') {for (Int J = 1; j <= I; j ++) {Y = y/2;} sum = sum + Y;} return sum;} catch (exception e) {Throw E;} public static string switchs (int I) {try {string S = ""; Switch (I) {case 10: S = "A"; break; Case 11: S = "B"; break; Case 12: S = "C"; break; Case 13: S = "D"; break; Case 14: S = "e"; break; Case 15: S = "F "; default: S = "" + I;} return s;} catch (exception e) {Throw E ;}} /*** convert the hexadecimal format to binary format * @ Param Str * @ return */ Public static string hextobin (string Str) {try {string resultstr = ""; string str2 = ""; for (INT I = 0; I <Str. length (); I ++) {Switch (Str. substring (I, I + 1 ). touppercase () {Case "0": str2 = "0000"; break; Case "1": str2 = "0001"; break; Case "2 ": str2 = "0010"; break; Case "3": str2 = "0011"; break; Case "4": str2 = "0100"; break; Case "5 ": str2 = "0101"; break; Case "6": str2 = "0110"; bre AK; Case "7": str2 = "0111"; break; Case "8": str2 = "1000"; break; Case "9": str2 = "1001 "; break; Case "A": str2 = "1010"; break; Case "B": str2 = "1011"; break; Case "C": str2 = "1100 "; break; Case "D": str2 = "1101"; break; Case "E": str2 = "1110"; break; Case "F": str2 = "1111 "; break;} resultstr + = str2;} return resultstr;} catch (exception e) {Throw E;}/*** convert ASCII code to hexadecimal format * @ Param Ch * @ Return */public static string asctohex (string ch) {try {char [] chararr = CH. tochararray (); string STR = ""; for (INT I = 0; I <chararr. length; I ++) {int A = (INT) chararr [I]; // ASCII STR + = integer. tostring (A, 16); // hexadecimal} return Str. touppercase () ;}catch (exception e) {Throw e ;}} /*** convert the hexadecimal string to ASCII * @ Param hexstr * @ return */public static string hextoasc (string HEX) {try {stringbuilder ascstr = ne W stringbuilder (); stringbuilder temp = new stringbuilder (); // convert each of the two to a group of ASCII characters for (INT I = 0; I