javaBASE64加密Word格式.docx
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java代码示例:
publicfinalclassBase64{
staticprivatefinalintBASELENGTH=255;
staticprivatefinalintLOOKUPLENGTH=64;
staticprivatefinalintTWENTYFOURBITGROUP=24;
staticprivatefinalintEIGHTBIT=8;
staticprivatefinalintSIXTEENBIT=16;
staticprivatefinalintSIXBIT=6;
staticprivatefinalintFOURBYTE=4;
staticprivatefinalintSIGN=-128;
staticprivatefinalcharPAD='
;
staticprivatefinalbooleanfDebug=false;
staticfinalprivatebyte[]base64Alphabet=newbyte[BASELENGTH];
staticfinalprivatechar[]lookUpBase64Alphabet=newchar[LOOKUPLENGTH];
static{
for(inti=0;
i<
BASELENGTH;
i++){
base64Alphabet[i]=-1;
}
for(inti='
Z'
i>
='
A'
i--){
base64Alphabet[i]=(byte)(i-'
);
z'
a'
+26);
9'
0'
+52);
base64Alphabet['
+'
]=62;
/'
]=63;
=25;
i++)
lookUpBase64Alphabet[i]=(char)('
+i);
for(inti=26,j=0;
=51;
i++,j++)
+j);
for(inti=52,j=0;
=61;
lookUpBase64Alphabet[62]=(char)'
lookUpBase64Alphabet[63]=(char)'
}
protectedstaticbooleanisWhiteSpace(charoctect){
return(octect==0x20||octect==0xd||octect==0xa||octect==0x9);
protectedstaticbooleanisPad(charoctect){
return(octect==PAD);
protectedstaticbooleanisData(charoctect){
return(base64Alphabet[octect]!
=-1);
protectedstaticbooleanisBase64(charoctect){
return(isWhiteSpace(octect)||isPad(octect)||isData(octect));
/**
*EncodeshexoctectsintoBase64
*
*@parambinaryData
*ArraycontainingbinaryData
*@returnEncodedBase64array
*/
publicstaticStringencode(byte[]binaryData){
if(binaryData==null)
returnnull;
intlengthDataBits=binaryData.length*EIGHTBIT;
if(lengthDataBits==0){
return"
"
intfewerThan24bits=lengthDataBits%TWENTYFOURBITGROUP;
intnumberTriplets=lengthDataBits/TWENTYFOURBITGROUP;
intnumberQuartet=fewerThan24bits!
=0?
numberTriplets+1
:
numberTriplets;
intnumberLines=(numberQuartet-1)/19+1;
charencodedData[]=null;
encodedData=newchar[numberQuartet*4+numberLines];
bytek=0,l=0,b1=0,b2=0,b3=0;
intencodedIndex=0;
intdataIndex=0;
inti=0;
if(fDebug){
System.out.println("
numberoftriplets="
+numberTriplets);
for(intline=0;
line<
numberLines-1;
line++){
for(intquartet=0;
quartet<
19;
quartet++){
b1=binaryData[dataIndex++];
b2=binaryData[dataIndex++];
b3=binaryData[dataIndex++];
if(fDebug){
System.out.println("
b1="
+b1+"
b2="
+b2+"
b3="
+b3);
}
l=(byte)(b2&
0x0f);
k=(byte)(b1&
0x03);
byteval1=((b1&
SIGN)==0)?
(byte)(b1>
>
2)
:
(byte)((b1)>
2^0xc0);
byteval2=((b2&
(byte)(b2>
4)
(byte)((b2)>
4^0xf0);
byteval3=((b3&
(byte)(b3>
6)
(byte)((b3)>
6^0xfc);
val2="
+val2);
k4="
+(k<
<
4));
vak="
+(val2|(k<
4)));
encodedData[encodedIndex++]=lookUpBase64Alphabet[val1];
encodedData[encodedIndex++]=lookUpBase64Alphabet[val2
|(k<
4)];
encodedData[encodedIndex++]=lookUpBase64Alphabet[(l<
|val3];
encodedData[encodedIndex++]=lookUpBase64Alphabet[b3&
0x3f];
i++;
}
encodedData[encodedIndex++]=0xa;
for(;
b1=binaryData[dataIndex++];
b2=binaryData[dataIndex++];
b3=binaryData[dataIndex++];
if(fDebug){
System.out.println("
+b3);
l=(byte)(b2&
k=(byte)(b1&
byteval1=((b1&
:
byteval2=((b2&
byteval3=((b3&
encodedData[encodedIndex++]=lookUpBase64Alphabet[val1];
encodedData[encodedIndex++]=lookUpBase64Alphabet[val2|(k<
encodedData[encodedIndex++]=lookUpBase64Alphabet[(l<
2)|val3];
encodedData[encodedIndex++]=lookUpBase64Alphabet[b3&
//formintegralnumberof6-bitgroups
if(fewerThan24bits==EIGHTBIT){
b1=binaryData[dataIndex];
b1="
+b1);
b1<
2="
+(b1>
2));
encodedData[encodedIndex++]=lookUpBase64Alphabet[k<
4];
encodedData[encodedIndex++]=PAD;
}elseif(fewerThan24bits==SIXTEENBIT){
b2=binaryData[dataIndex+1];
encodedData[encodedIndex++]=lookUpBase64Alphabet[l<
2];
encodedData[encodedIndex]=0xa;
returnnewString(encodedData);
*DecodesBase64dataintooctects
*BytearraycontainingBase64data
*@returnArraycontaininddecodeddata.
publicstaticbyte[]decode(Stringencoded){
if(encoded==null)
char[]base64Data=encoded.toCharArray();
//removewhitespaces
intlen=removeWhiteSpace(base64Data);
if(len%FOURBYTE!
=0){
//shouldbedivisiblebyfour
intnumberQuadruple=(len/FOURBYTE);
if(numberQuadruple==0)
returnnewbyte[0];
bytedecodedData[]=null;
byteb1=0,b2=0,b3=0,b4=0,marker0=0,marker1=0;
chard1=0,d2=0,d3=0,d4=0;
decodedData=newbyte[(numberQuadruple)*3];
numberQuadruple-1;
if(!
isData((d1=base64Data[dataIndex++]))
||!
isData((d2=base64Data[dataIndex++]))
isData((d3=base64Data[dataIndex++]))
isData((d4=base64Data[dataIndex++])))
returnnull;
//iffound"
nodata"
justreturnnull
b1=base64Alphabet[d1];
b2=base64Alphabet[d2];
b3=base64Alphabet[d3];
b4=base64Alphabet[d4];
decodedData[encodedIndex++]=(byte)(b1<
2|b2>
4);
decodedData[encodedIndex++]=(byte)(((b2&
0xf)<
4)|((b3>
2)&
0xf));
decodedData[encodedIndex++]=(byte)(b3<
6|b4);
if(!
||!
isData((d2=base64Data[dataIndex++]))){
b1=base64Alphabet[d1];
b2=base64Alphabet[d2];
d3=base64Data[dataIndex++];
d4=base64Data[dataIndex++];
isData((d3))||!
isData((d4))){//CheckiftheyarePADcharacters
if(isPad(d3)&
&
isPad(d4)){//TwoPADe.g.3c[Pad][Pad]
if((b2&
0xf)!
=0)//last4bitsshouldbezero
returnnull;
byte[]tmp=newbyte[i*3+1];
System.arraycopy(decodedData,0,tmp,0,i*3);
tmp[encodedIndex]=(byte)(b1<
returntmp;
}elseif(!
isPad(d3)&
isPad(d4)){//OnePADe.g.3cQ[Pad]
b3=base64Alphabet[d3];
if((b3&
0x3)!
=0)//last2bitsshouldbezero
byte[]tmp=newbyte[i*3+2];
tmp[encodedIndex++]=(byte)(b1<
tmp[encodedIndex]=(byte)(((b2&
}else{
//anerrorlike"
3c[Pad]r"
"
3cdX"
3cXd"
3cXX"
//whereXisnondata
}else{//NoPADe.g3cQl