java常用工具类 UUID、Map工具类

2023-08-22 20:10:04 294

本文实例为大家分享了Java常用工具类的具体代码，供大家参考，具体内容如下

UUID工具类

packagecom.jarvis.base.util;

importjava.security.MessageDigest;
importjava.security.NoSuchAlgorithmException;
importjava.security.SecureRandom;

/**
*Aclassthatrepresentsanimmutableuniversallyuniqueidentifier(UUID).
*AUUIDrepresentsa128-bitvalue.
*
*
Thereexistdifferentvariantsoftheseglobalidentifiers.Themethods
*ofthisclassareformanipulatingtheLeach-Salzvariant,althoughthe
*constructorsallowthecreationofanyvariantofUUID(describedbelow).
*

*
Thelayoutofavariant2(Leach-Salz)UUIDisasfollows:
*

*Themostsignificantlongconsistsofthefollowingunsignedfields:
*
*0xFFFFFFFF00000000time_low
*0x00000000FFFF0000time_mid
*0x000000000000F000version
*0x0000000000000FFFtime_hi
*
*Theleastsignificantlongconsistsofthefollowingunsignedfields:
**0xC000000000000000variant
*0x3FFF000000000000clock_seq
*0x0000FFFFFFFFFFFFnode
*
*
*
Thevariantfieldcontainsavaluewhichidentifiesthelayoutof
*theUUID.Thebitlayoutdescribedaboveisvalidonlyfor
*aUUIDwithavariantvalueof2,whichindicatesthe
*Leach-Salzvariant.
*

*
Theversionfieldholdsavaluethatdescribesthetypeofthis
*UUID.TherearefourdifferentbasictypesofUUIDs:time-based,
*DCEsecurity,name-based,andrandomlygeneratedUUIDs.Thesetypes
*haveaversionvalueof1,2,3and4,respectively.
*

*
FormoreinformationincludingalgorithmsusedtocreateUUIDs,
*seetheInternet-DraftUUIDsandGUIDs
*orthestandardsbodydefinitionat
*ISO/IEC11578:1996.
*
*@version1.14,07/12/04
*@since1.5
*/
@Deprecated
publicfinalclassUUIDimplementsjava.io.Serializable
{

/**
*ExplicitserialVersionUIDforinteroperability.
*/
privatestaticfinallongserialVersionUID=-4856846361193249489L;

/*
*Themostsignificant64bitsofthisUUID.
*
*@serial
*/
privatefinallongmostSigBits;

/**
*Theleastsignificant64bitsofthisUUID.
*
*@serial
*/
privatefinallongleastSigBits;

/*
*TheversionnumberassociatedwiththisUUID.Computedondemand.
*/
privatetransientintversion=-1;

/*
*ThevariantnumberassociatedwiththisUUID.Computedondemand.
*/
privatetransientintvariant=-1;

/*
*ThetimestampassociatedwiththisUUID.Computedondemand.
*/
privatetransientvolatilelongtimestamp=-1;

/*
*TheclocksequenceassociatedwiththisUUID.Computedondemand.
*/
privatetransientintsequence=-1;

/*
*ThenodenumberassociatedwiththisUUID.Computedondemand.
*/
privatetransientlongnode=-1;

/*
*ThehashcodeofthisUUID.Computedondemand.
*/
privatetransientinthashCode=-1;

/*
*Therandomnumbergeneratorusedbythisclasstocreaterandom
*basedUUIDs.
*/
privatestaticvolatileSecureRandomnumberGenerator=null;

//ConstructorsandFactories

/*
*PrivateconstructorwhichusesabytearraytoconstructthenewUUID.
*/
privateUUID(byte[]data)
{
longmsb=0;
longlsb=0;
for(inti=0;i<8;i++)
msb=(msb<<8)|(data[i]&0xff);
for(inti=8;i<16;i++)
lsb=(lsb<<8)|(data[i]&0xff);
this.mostSigBits=msb;
this.leastSigBits=lsb;
}

/**
*ConstructsanewUUIDusingthespecifieddata.
*mostSigBitsisusedforthemostsignificant64bits
*oftheUUIDandleastSigBitsbecomesthe
*leastsignificant64bitsoftheUUID.
*
*@parammostSigBits
*@paramleastSigBits
*/
publicUUID(longmostSigBits,longleastSigBits)
{
this.mostSigBits=mostSigBits;
this.leastSigBits=leastSigBits;
}

/**
*Staticfactorytoretrieveatype4(pseudorandomlygenerated)UUID.
*

*TheUUIDisgeneratedusingacryptographicallystrong
*pseudorandomnumbergenerator.
*
*@returnarandomlygeneratedUUID.
*/
@SuppressWarnings("unused")
publicstaticUUIDrandomUUID()
{
SecureRandomng=numberGenerator;
if(ng==null)
{
numberGenerator=ng=newSecureRandom();
}

byte[]randomBytes=newbyte[16];
ng.nextBytes(randomBytes);
randomBytes[6]&=0x0f;/*clearversion*/
randomBytes[6]|=0x40;/*settoversion4*/
randomBytes[8]&=0x3f;/*clearvariant*/
randomBytes[8]|=0x80;/*settoIETFvariant*/
UUIDresult=newUUID(randomBytes);
returnnewUUID(randomBytes);
}

/**
*Staticfactorytoretrieveatype3(namebased)UUIDbasedon
*thespecifiedbytearray.
*
*@paramnameabytearraytobeusedtoconstructaUUID.
*@returnaUUIDgeneratedfromthespecifiedarray.
*/
publicstaticUUIDnameUUIDFromBytes(byte[]name)
{
MessageDigestmd;
try
{
md=MessageDigest.getInstance("MD5");
}
catch(NoSuchAlgorithmExceptionnsae)
{
thrownewInternalError("MD5notsupported");
}
byte[]md5Bytes=md.digest(name);
md5Bytes[6]&=0x0f;/*clearversion*/
md5Bytes[6]|=0x30;/*settoversion3*/
md5Bytes[8]&=0x3f;/*clearvariant*/
md5Bytes[8]|=0x80;/*settoIETFvariant*/
returnnewUUID(md5Bytes);
}

/**
*CreatesaUUIDfromthestringstandardrepresentationas
*describedinthe{@link#toString}method.
*
*@paramnameastringthatspecifiesaUUID.
*@returnaUUIDwiththespecifiedvalue.
*@throwsIllegalArgumentExceptionifnamedoesnotconformtothe
*stringrepresentationasdescribedin{@link#toString}.
*/
publicstaticUUIDfromString(Stringname)
{
String[]components=name.split("-");
if(components.length!=5)
thrownewIllegalArgumentException("InvalidUUIDstring:"+name);
for(inti=0;i<5;i++)
components[i]="0x"+components[i];

longmostSigBits=Long.decode(components[0]).longValue();
mostSigBits<<=16;
mostSigBits|=Long.decode(components[1]).longValue();
mostSigBits<<=16;
mostSigBits|=Long.decode(components[2]).longValue();

longleastSigBits=Long.decode(components[3]).longValue();
leastSigBits<<=48;
leastSigBits|=Long.decode(components[4]).longValue();

returnnewUUID(mostSigBits,leastSigBits);
}

//FieldAccessorMethods

/**
*Returnstheleastsignificant64bitsofthisUUID's128bitvalue.
*
*@returntheleastsignificant64bitsofthisUUID's128bitvalue.
*/
publiclonggetLeastSignificantBits()
{
returnleastSigBits;
}

/**
*Returnsthemostsignificant64bitsofthisUUID's128bitvalue.
*
*@returnthemostsignificant64bitsofthisUUID's128bitvalue.
*/
publiclonggetMostSignificantBits()
{
returnmostSigBits;
}

/**
*TheversionnumberassociatedwiththisUUID.Theversion
*numberdescribeshowthisUUIDwasgenerated.
*

*Theversionnumberhasthefollowingmeaning:

*

*1Time-basedUUID
*
2DCEsecurityUUID
*
3Name-basedUUID
*
4RandomlygeneratedUUID
*
*
*@returntheversionnumberofthisUUID.
*/
publicintversion()
{
if(version<0)
{
//Versionisbitsmaskedby0x000000000000F000inMSlong
version=(int)((mostSigBits>>12)&0x0f);
}
returnversion;
}

/**
*ThevariantnumberassociatedwiththisUUID.Thevariant
*numberdescribesthelayoutoftheUUID.
*
*Thevariantnumberhasthefollowingmeaning:

*

*0ReservedforNCSbackwardcompatibility
*
2TheLeach-Salzvariant(usedbythisclass)
*
6Reserved,MicrosoftCorporationbackwardcompatibility
*
7Reservedforfuturedefinition
*
*
*@returnthevariantnumberofthisUUID.
*/
publicintvariant()
{
if(variant<0)
{
//Thisfieldiscomposedofavaryingnumberofbits
if((leastSigBits>>>63)==0)
{
variant=0;
}
elseif((leastSigBits>>>62)==2)
{
variant=2;
}
else
{
variant=(int)(leastSigBits>>>61);
}
}
returnvariant;
}

/**
*ThetimestampvalueassociatedwiththisUUID.
*
*
The60bittimestampvalueisconstructedfromthetime_low,
*time_mid,andtime_hifieldsofthisUUID.Theresulting
*timestampismeasuredin100-nanosecondunitssincemidnight,
*October15,1582UTC.

*

*Thetimestampvalueisonlymeaningfulinatime-basedUUID,which
*hasversiontype1.IfthisUUIDisnotatime-basedUUIDthen
*thismethodthrowsUnsupportedOperationException.
*
*@throwsUnsupportedOperationExceptionifthisUUIDisnota
*version1UUID.
*/
publiclongtimestamp()
{
if(version()!=1)
{
thrownewUnsupportedOperationException("Notatime-basedUUID");
}
longresult=timestamp;
if(result<0)
{
result=(mostSigBits&0x0000000000000FFFL)<<48;
result|=((mostSigBits>>16)&0xFFFFL)<<32;
result|=mostSigBits>>>32;
timestamp=result;
}
returnresult;
}

/**
*TheclocksequencevalueassociatedwiththisUUID.
*

*
The14bitclocksequencevalueisconstructedfromtheclock
*sequencefieldofthisUUID.Theclocksequencefieldisusedto
*guaranteetemporaluniquenessinatime-basedUUID.

*

*TheclockSequencevalueisonlymeaningfulinatime-basedUUID,which
*hasversiontype1.IfthisUUIDisnotatime-basedUUIDthen
*thismethodthrowsUnsupportedOperationException.
*
*@returntheclocksequenceofthisUUID.
*@throwsUnsupportedOperationExceptionifthisUUIDisnota
*version1UUID.
*/
publicintclockSequence()
{
if(version()!=1)
{
thrownewUnsupportedOperationException("Notatime-basedUUID");
}
if(sequence<0)
{
sequence=(int)((leastSigBits&0x3FFF000000000000L)>>>48);
}
returnsequence;
}

/**
*ThenodevalueassociatedwiththisUUID.
*

*
The48bitnodevalueisconstructedfromthenodefieldof
*thisUUID.ThisfieldisintendedtoholdtheIEEE802address
*ofthemachinethatgeneratedthisUUIDtoguaranteespatial
*uniqueness.

*

*Thenodevalueisonlymeaningfulinatime-basedUUID,which
*hasversiontype1.IfthisUUIDisnotatime-basedUUIDthen
*thismethodthrowsUnsupportedOperationException.
*
*@returnthenodevalueofthisUUID.
*@throwsUnsupportedOperationExceptionifthisUUIDisnota
*version1UUID.
*/
publiclongnode()
{
if(version()!=1)
{
thrownewUnsupportedOperationException("Notatime-basedUUID");
}
if(node<0)
{
node=leastSigBits&0x0000FFFFFFFFFFFFL;
}
returnnode;
}

//ObjectInheritedMethods

/**
*ReturnsaStringobjectrepresentingthis
*UUID.
*

*
TheUUIDstringrepresentationisasdescribedbythisBNF:
*
*UUID="-""-"
*"-"
*"-"
*
*time_low=4*
*time_mid=2*
*time_high_and_version=2*
*variant_and_sequence=2*
*node=6*
*hexOctet=
*hexDigit=
*"0"|"1"|"2"|"3"|"4"|"5"|"6"|"7"|"8"|"9"
*|"a"|"b"|"c"|"d"|"e"|"f"
*|"A"|"B"|"C"|"D"|"E"|"F"
*
*
*@returnastringrepresentationofthisUUID.
*/
publicStringtoString()
{
return(digits(mostSigBits>>32,8)+"-"+
digits(mostSigBits>>16,4)+"-"+
digits(mostSigBits,4)+"-"+
digits(leastSigBits>>48,4)+"-"+
digits(leastSigBits,12));
}

/**
*Returnsvalrepresentedbythespecifiednumberofhexdigits.
*/
privatestaticStringdigits(longval,intdigits)
{
longhi=1L<<(digits*4);
returnLong.toHexString(hi|(val&(hi-1))).substring(1);
}

/**
*ReturnsahashcodeforthisUUID.
*
*@returnahashcodevalueforthisUUID.
*/
publicinthashCode()
{
if(hashCode==-1)
{
hashCode=(int)((mostSigBits>>32)^
mostSigBits^
(leastSigBits>>32)^
leastSigBits);
}
returnhashCode;
}

/**
*Comparesthisobjecttothespecifiedobject.Theresultis
*trueifandonlyiftheargumentisnot
*null,isaUUIDobject,hasthesamevariant,
*andcontainsthesamevalue,bitforbit,asthisUUID.
*
*@paramobjtheobjecttocomparewith.
*@returntrueiftheobjectsarethesame;
*falseotherwise.
*/
publicbooleanequals(Objectobj)
{
if(!(objinstanceofUUID))
returnfalse;
if(((UUID)obj).variant()!=this.variant())
returnfalse;
UUIDid=(UUID)obj;
return(mostSigBits==id.mostSigBits&&
leastSigBits==id.leastSigBits);
}

//ComparisonOperations

/**
*ComparesthisUUIDwiththespecifiedUUID.
*
*
ThefirstoftwoUUIDsfollowsthesecondifthemostsignificant
*fieldinwhichtheUUIDsdifferisgreaterforthefirstUUID.
*
*@paramvalUUIDtowhichthisUUIDistobecompared.
*@return-1,0or1asthisUUIDislessthan,equal
*to,orgreaterthanval.
*/
publicintcompareTo(UUIDval)
{
//TheorderingisintentionallysetupsothattheUUIDs
//cansimplybenumericallycomparedastwonumbers
return(this.mostSigBitsval.mostSigBits?1:
(this.leastSigBitsval.leastSigBits?1:
0))));
}

/**
*ReconstitutetheUUIDinstancefromastream(thatis,
*deserializeit).Thisisnecessarytosetthetransientfields
*totheircorrectuninitializedvaluesotheywillberecomputed
*ondemand.
*/
privatevoidreadObject(java.io.ObjectInputStreamin)
throwsjava.io.IOException,ClassNotFoundException
{

in.defaultReadObject();

//Set"cachedcomputation"fieldstotheirinitialvalues
version=-1;
variant=-1;
timestamp=-1;
sequence=-1;
node=-1;
hashCode=-1;
}

}

Map工具类

packagecom.jarvis.base.util;

importjava.util.Map;
/**
*
*
*@Title:MapHelper.java
*@Packagecom.jarvis.base.util
*@Description:Map工具类
*@versionV1.0
*/
publicclassMapHelper{
/**
*获得字串值
*
*@paramname
*键值名称
*@return若不存在，则返回空字串
*/
publicstaticStringgetString(Mapmap,Stringname){
if(name==null||name.equals("")){
return"";
}

Stringvalue="";
if(map.containsKey(name)==false){
return"";
}
Objectobj=map.get(name);
if(obj!=null){
value=obj.toString();
}
obj=null;

returnvalue;
}

/**
*返回整型值
*
*@paramname
*键值名称
*@return若不存在，或转换失败，则返回0
*/
publicstaticintgetInt(Mapmap,Stringname){
if(name==null||name.equals("")){
return0;
}

intvalue=0;
if(map.containsKey(name)==false){
return0;
}

Objectobj=map.get(name);
if(obj==null){
return0;
}

if(!(objinstanceofInteger)){
try{
value=Integer.parseInt(obj.toString());
}catch(Exceptionex){
ex.printStackTrace();
System.err.println("name["+name+"]对应的值不是数字，返回0");
value=0;
}
}else{
value=((Integer)obj).intValue();
obj=null;
}

returnvalue;
}

/**
*获取长整型值
*
*@paramname
*键值名称
*@return若不存在，或转换失败，则返回0
*/
publicstaticlonggetLong(Mapmap,Stringname){
if(name==null||name.equals("")){
return0;
}

longvalue=0;
if(map.containsKey(name)==false){
return0;
}

Objectobj=map.get(name);
if(obj==null){
return0;
}

if(!(objinstanceofLong)){
try{
value=Long.parseLong(obj.toString());
}catch(Exceptionex){
ex.printStackTrace();
System.err.println("name["+name+"]对应的值不是数字，返回0");
value=0;
}
}else{
value=((Long)obj).longValue();
obj=null;
}

returnvalue;
}

/**
*获取Float型值
*
*@paramname
*键值名称
*@return若不存在，或转换失败，则返回0
*/
publicstaticfloatgetFloat(Mapmap,Stringname){
if(name==null||name.equals("")){
return0;
}

floatvalue=0;
if(map.containsKey(name)==false){
return0;
}

Objectobj=map.get(name);
if(obj==null){
return0;
}

if(!(objinstanceofFloat)){
try{
value=Float.parseFloat(obj.toString());
}catch(Exceptionex){
ex.printStackTrace();
System.err.println("name["+name+"]对应的值不是数字，返回0");
value=0;
}
}else{
value=((Float)obj).floatValue();
obj=null;
}

returnvalue;
}

/**
*获取Double型值
*
*@paramname
*键值名称
*@return若不存在，或转换失败，则返回0
*/
publicstaticdoublegetDouble(Mapmap,Stringname){
if(name==null||name.equals("")){
return0;
}

doublevalue=0;
if(map.containsKey(name)==false){
return0;
}

Objectobj=map.get(name);
if(obj==null){
return0;
}

if(!(objinstanceofDouble)){
try{
value=Double.parseDouble(obj.toString());
}catch(Exceptionex){
ex.printStackTrace();
System.err.println("name["+name+"]对应的值不是数字，返回0");
value=0;
}
}else{
value=((Double)obj).doubleValue();
obj=null;
}

returnvalue;
}

/**
*获取Bool值
*
*@paramname
*键值名称
*@return若不存在，或转换失败，则返回false
*/
publicstaticbooleangetBoolean(Mapmap,Stringname){
if(name==null||name.equals("")){
returnfalse;
}

booleanvalue=false;
if(map.containsKey(name)==false){
returnfalse;
}
Objectobj=map.get(name);
if(obj==null){
returnfalse;
}

if(objinstanceofBoolean){
return((Boolean)obj).booleanValue();
}

value=Boolean.valueOf(obj.toString()).booleanValue();
obj=null;
returnvalue;
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

java常用工具类 UUID、Map工具类

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