Java实现的文本字符串操作工具类实例【数据替换，加密解密操作】
本文实例讲述了Java实现的文本字符串操作工具类。分享给大家供大家参考，具体如下：
packagecom.gcloud.common;
importorg.apache.commons.lang.StringUtils;
importjava.security.MessageDigest;
importjava.security.NoSuchAlgorithmException;
importjava.text.BreakIterator;
importjava.util.ArrayList;
importjava.util.Date;
importjava.util.Random;
/**
*文本字符串工具类
*Createdbycharlinon2017/9/10.
*/
publicclassTextUtil{
privatestaticfinalchar[]QUOTE_ENCODE=""".toCharArray();
privatestaticfinalchar[]AMP_ENCODE="&".toCharArray();
privatestaticfinalchar[]LT_ENCODE="<".toCharArray();
privatestaticfinalchar[]GT_ENCODE=">".toCharArray();
privatefinalstaticString[]hex={"00","01","02","03","04","05",
"06","07","08","09","0A","0B","0C","0D","0E","0F","10",
"11","12","13","14","15","16","17","18","19","1A","1B",
"1C","1D","1E","1F","20","21","22","23","24","25","26",
"27","28","29","2A","2B","2C","2D","2E","2F","30","31",
"32","33","34","35","36","37","38","39","3A","3B","3C",
"3D","3E","3F","40","41","42","43","44","45","46","47",
"48","49","4A","4B","4C","4D","4E","4F","50","51","52",
"53","54","55","56","57","58","59","5A","5B","5C","5D",
"5E","5F","60","61","62","63","64","65","66","67","68",
"69","6A","6B","6C","6D","6E","6F","70","71","72","73",
"74","75","76","77","78","79","7A","7B","7C","7D","7E",
"7F","80","81","82","83","84","85","86","87","88","89",
"8A","8B","8C","8D","8E","8F","90","91","92","93","94",
"95","96","97","98","99","9A","9B","9C","9D","9E","9F",
"A0","A1","A2","A3","A4","A5","A6","A7","A8","A9","AA",
"AB","AC","AD","AE","AF","B0","B1","B2","B3","B4","B5",
"B6","B7","B8","B9","BA","BB","BC","BD","BE","BF","C0",
"C1","C2","C3","C4","C5","C6","C7","C8","C9","CA","CB",
"CC","CD","CE","CF","D0","D1","D2","D3","D4","D5","D6",
"D7","D8","D9","DA","DB","DC","DD","DE","DF","E0","E1",
"E2","E3","E4","E5","E6","E7","E8","E9","EA","EB","EC",
"ED","EE","EF","F0","F1","F2","F3","F4","F5","F6","F7",
"F8","F9","FA","FB","FC","FD","FE","FF"};
privatefinalstaticbyte[]val={0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x00,0x01,
0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F};
privatestaticMessageDigestdigest=null;
/**
*替换字符串
*@paramline
*@paramoldStr
*@paramnewStr
*@return
*/
publicstaticStringreplace(Stringline,StringoldStr,StringnewStr){
if(StringUtils.isEmpty(line))returnnull;
intindex=0;
if((index=line.indexOf(oldStr,index))>=0){
char[]charArray=line.toCharArray();
char[]newStrArray=newStr.toCharArray();
intoldLen=oldStr.length();
StringBufferbuf=newStringBuffer(charArray.length);
buf.append(charArray,0,index).append(newStrArray);
index+=oldLen;
inti=index;
while((index=line.indexOf(oldStr,index))>0){
buf.append(charArray,i,index-i).append(newStrArray);
index+=oldLen;
i=index;
}
buf.append(charArray,i,charArray.length-i);
returnbuf.toString();
}
returnline;
}
/**
*替换字符串,并存入替换次数
*@paramline
*@paramoldStr
*@paramnewStr
*@return
*/
publicstaticStringreplace(Stringline,StringoldStr,StringnewStr,int[]countArr){
if(StringUtils.isEmpty(line))returnnull;
intindex=0;
if((index=line.indexOf(oldStr,index))>=0){
intcount=0;
count++;
char[]charArray=line.toCharArray();
char[]newStrArray=newStr.toCharArray();
intoldLen=oldStr.length();
StringBufferbuf=newStringBuffer(charArray.length);
buf.append(charArray,0,index).append(newStrArray);
index+=oldLen;
inti=index;
while((index=line.indexOf(oldStr,index))>0){
buf.append(charArray,i,index-i).append(newStrArray);
index+=oldLen;
i=index;
count++;
}
buf.append(charArray,i,charArray.length-i);
countArr[0]=count;
returnbuf.toString();
}
returnline;
}
/**
*替换字符串，不区分大小写
*@paramline
*@paramoldStr
*@paramnewStr
*@return
*/
publicstaticStringreplaceIgnoreCase(Stringline,StringoldStr,StringnewStr){
if(StringUtils.isEmpty(line))returnnull;
intindex=0;
line=line.toLowerCase();
oldStr=oldStr.toLowerCase();
if((index=line.indexOf(oldStr,index))>=0){
char[]charArray=line.toCharArray();
char[]newStrArray=newStr.toCharArray();
intoldLen=oldStr.length();
StringBufferbuf=newStringBuffer(charArray.length);
buf.append(charArray,0,index).append(newStrArray);
index+=oldLen;
inti=index;
while((index=line.indexOf(oldStr,index))>0){
buf.append(charArray,i,index-i).append(newStrArray);
index+=oldLen;
i=index;
}
buf.append(charArray,i,charArray.length-i);
returnbuf.toString();
}
returnline;
}
/**
*替换字符串，不区分大小写,并存入替换次数
*@paramline
*@paramoldStr
*@paramnewStr
*@return
*/
publicstaticStringreplaceIgnoreCase(Stringline,StringoldStr,StringnewStr,int[]countArr){
if(StringUtils.isEmpty(line))returnnull;
intindex=0;
line=line.toLowerCase();
oldStr=oldStr.toLowerCase();
if((index=line.indexOf(oldStr,index))>=0){
char[]charArray=line.toCharArray();
char[]newStrArray=newStr.toCharArray();
intoldLen=oldStr.length();
StringBufferbuf=newStringBuffer(charArray.length);
buf.append(charArray,0,index).append(newStrArray);
index+=oldLen;
inti=index;
intcount=0;
while((index=line.indexOf(oldStr,index))>0){
count++;
buf.append(charArray,i,index-i).append(newStrArray);
index+=oldLen;
i=index;
}
buf.append(charArray,i,charArray.length-i);
countArr[0]=count;
returnbuf.toString();
}
returnline;
}
/**
*替换页面html标签
*@paramhtmlStr
*@return
*/
publicstaticStringescapeHTMLTags(StringhtmlStr){
if(StringUtils.isEmpty(htmlStr))returnnull;
charch;
intlast=0;
char[]htmlStrArr=htmlStr.toCharArray();
intlen=htmlStrArr.length;
StringBufferoutBuf=newStringBuffer((int)(len*1.3));
inti=0;
for(;i'>'){
continue;
}elseif(ch=='<'){
if(i>last){
outBuf.append(htmlStrArr,last,i-last);
}
last=i+1;
outBuf.append(LT_ENCODE);
}elseif(ch=='>'){
if(i>last){
outBuf.append(htmlStrArr,last,i-last);
}
last=i+1;
outBuf.append(GT_ENCODE);
}
}
if(last==0){
returnhtmlStr;
}
if(i>last){
outBuf.append(htmlStrArr,last,i-last);
}
returnoutBuf.toString();
}
/**
*HashesaStringusingtheMd5algorithmandreturnstheresultasa
*Stringofhexadecimalnumbers.Thismethodissynchronizedtoavoid
*excessiveMessageDigestobjectcreation.Ifcallingthismethodbecomesa
*bottleneckinyourcode,youmaywishtomaintainapoolofMessageDigest
*objectsinsteadofusingthismethod.
*@paramdata
*@return
*/
publicsynchronizedstaticStringhash(Stringdata){
if(digest==null){
try{
digest=MessageDigest.getInstance("MD5");
}catch(NoSuchAlgorithmExceptione){
System.err.println("FailedtoloadtheMD5MessageDigest.Jivewillbeunabletofunctionnormally.");
e.printStackTrace();
}
}
digest.update(data.getBytes());
returnencodeHex(digest.digest());
}
/**
*TurnsanarrayofbytesintoaStringrepresentingeachbyteasan
*unsignedhexnumber.
*@parambytes
*@return
*/
publicstaticfinalStringencodeHex(byte[]bytes){
StringBufferbuf=newStringBuffer(bytes.length*2);
inti;
for(i=0;i>2)&0x3f;
ret.append(cvt.charAt(c));
c=(data[i]<<4)&0x3f;
if(++i>4)&0x0f;
ret.append(cvt.charAt(c));
if(i>6)&0x03;
ret.append(cvt.charAt(c));
}else{
++i;
ret.append((char)fillchar);
}
if(i>4)&0x3));
ret.append((char)c);
if(++i>2)&0xf);
ret.append((char)c1);
}
if(++i0){
wordList.add(tmp);
}
}
return(String[])wordList.toArray(newString[wordList.size()]);
}
/**
*Pseudo-randomnumbergeneratorobjectforusewithrandomString().The
*Randomclassisnotconsideredtobecryptographicallysecure,soonly
*usetheserandomStringsforlowtomediumsecurityapplications.
*/
privatestaticRandomrandGen=newRandom();
/**
*Arrayofnumbersandlettersofmixedcase.Numbersappearinthelist
*twicesothatthereisamoreequalchancethatanumberwillbepicked.
*Wecanusethearraytogetarandomnumberorletterbypickingarandom
*arrayindex.
*/
privatestaticchar[]numbersAndLetters=("0123456789abcdefghijklmnopqrstuvwxyz"+"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
/**
*ReturnsarandomStringofnumbersandletters(loweranduppercase)of
*thespecifiedlength.ThemethodusestheRandomclassthatisbuilt-in
*toJavawhichissuitableforlowtomediumgradesecurityuses.This
*meansthattheoutputisonlypseudorandom,i.e.,eachnumberis
*mathematicallygeneratedsoisnottrulyrandom.
*@paramlengththedesiredlengthoftherandomStringtoreturn.
*@returnarandomStringofnumbersandlettersofthespecifiedlength.
*/
publicstaticfinalStringrandomString(intlength){
if(length<1){
returnnull;
}
char[]randBuffer=newchar[length];
for(inti=0;ilength,theStringwillbe
*choppedthere.Ifnonewlineorwhitespaceisfoundin
*stringuptotheindexlength,theString
*willchoppedatlength.
*
*Forexample,chopAtWord("ThisisaniceString",10)willreturn"Thisis
*a"whichisthefirstwordboundarylessthanorequalto10characters
*intotheoriginalString.
*@paramstringtheStringtochop.
*@paramlength
*@returnasubstringofstringwhoselengthislessthanor
*equaltolength,andthatischoppedat
*whitespace.
*/
publicstaticfinalStringchopAtWord(Stringstring,intlength){
if(string==null){
returnstring;
}
char[]charArray=string.toCharArray();
intsLength=string.length();
if(length0;i--){
if(charArray[i]==''){
returnstring.substring(0,i).trim();
}
}
//DidnotfindwordboundarysoreturnoriginalStringchoppedat
//specifiedlength.
returnstring.substring(0,length);
}
/**
*EscapesallnecessarycharactersintheStringsothatitcanbeusedin
*anXMLdoc.
*@paramstringthestringtoescape.
*@returnthestringwithappropriatecharactersescaped.
*/
publicstaticfinalStringescapeForXML(Stringstring){
if(string==null){
returnnull;
}
charch;
inti=0;
intlast=0;
char[]input=string.toCharArray();
intlen=input.length;
StringBufferout=newStringBuffer((int)(len*1.3));
for(;i'>'){
continue;
}elseif(ch=='<'){
if(i>last){
out.append(input,last,i-last);
}
last=i+1;
out.append(LT_ENCODE);
}elseif(ch=='&'){
if(i>last){
out.append(input,last,i-last);
}
last=i+1;
out.append(AMP_ENCODE);
}elseif(ch=='"'){
if(i>last){
out.append(input,last,i-last);
}
last=i+1;
out.append(QUOTE_ENCODE);
}
}
if(last==0){
returnstring;
}
if(i>last){
out.append(input,last,i-last);
}
returnout.toString();
}
/**
*UnescapestheStringbyconvertingXMLescapesequencesbackintonormal
*characters.
*@paramstringthestringtounescape.
*@returnthestringwithappropriatecharactersunescaped.
*/
publicstaticfinalStringunescapeFromXML(Stringstring){
string=replace(string,"<","<");
string=replace(string,">",">");
string=replace(string,""","\"");
returnreplace(string,"&","&");
}
publicstaticStringescape(Strings){
StringBuffersbuf=newStringBuffer();
intlen=s.length();
for(inti=0;i>>8)]);
sbuf.append(hex[(0x00FF&ch)]);
}
}
returnsbuf.toString();
}
publicstaticStringunescape(Strings){
StringBuffersbuf=newStringBuffer();
inti=0;
intlen=s.length();
while(ilengthof16.
*
*@paramstring
*theoriginalStringtopad.
*@paramlength
*thedesiredlengthofthenewpaddedString.
*@returnanewStringpaddedwiththerequirednumberof0's.
*/
publicstaticfinalStringzeroPadString(Stringstring,intlength){
if(string==null||string.length()>length){
returnstring;
}
StringBufferbuf=newStringBuffer(length);
buf.append(zeroArray,0,length-string.length()).append(string);
returnbuf.toString();
}
/**
*FormatsaDateasafifteencharacterlongStringmadeupoftheDate's
*paddedmillisecondvalue.
*@returnaDateencodedasaString.
*/
publicstaticfinalStringdateToMillis(Datedate){
returnzeroPadString(Long.toString(date.getTime()),15);
}
publicstaticvoidmain(String[]args){
System.out.println(replace("aaaaabbbcccc","aa","gg"));
System.out.println(replaceIgnoreCase("AAAAbbbcccc","aa","gg"));
System.out.println(escapeHTMLTags("AAAAbb"));
}
}
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希望本文所述对大家java程序设计有所帮助。