Apache-Commons工具包API整理
一、commons-lang3
1、 字符串，数字，日期，数组等工具类
StringUtils 字符串工具类
包含判断方法：contains/containsXXX
字符串替换方法:replace/replaceXXX
获取子串：substring/substringXXX
索引(index)：indexOf/indexOfXXX/lastIndexOf/lastIndexOfXXX
判断方法：
1、isEmpty/isNotEmpty/isBlank/isNotBlank/isNumeric/isWhitespace
2、sartsWith/startsWithAny/endsWith/endsWithIgnoreCase
处理方法：
abbreviate 缩短 capitalise 首字母 repeat 重复 left/right/center 左右中间
removeXXX 移除 trimXXX 去空 reverseXXX 翻转 stripXXX 移除
defaultXXX 默认 lowerCase/upperCase deleteXXX 删除处理
splitXXX分解处理 join 拼接
StringEscapeUtils
CSV处理：escapeCsv/unescapeCsv
HTML处理：escapeHtml/unescapeHtml
java处理：escapeJava/unescapeJava
JavaScript处理：escapeJavaScript/unescapeJavaScript
XML处理：escapeXml/unescapeXml/escapeSql
NumberUtils 数字工具类
创建数字：createXXX 创建Integer,Float,Double,Number,BigDecimal,BigInteger等数字
字符转数字：toXXX 字符串转数字：Byte,Double,Float,Int,Long,Short
判断是否数字：isDigits/isNumber
其他方法：compare,max,min,
ArrayUtils 数组工具类
添加移除:add,addAll，remove,removeElement,
拷贝：clone
判断：contains,isEmpty,isNotEmpty,isEquals,isSameLength,
其他：getLength,indexOf,lastIndexOf,nullToEmpty,reverse,subArray,
转换：toMap,toObject,toPrimitive,toString
RandomUtils 随机数工具类
nextBoolean/nextInt/nextLong/nextFloat/nextDouble
RandomStringUtils 随机字符串工具类
random/randomNumeric/randomAlphabetic/randomAscii
DateUtils 日期工具类
说明:XXX表示milisecends,seconds,minutes,hours,days,weeks,months,years
时间加减：add/addXXX
时间设置: setXXX
获取片段: getFragmentInXXX 获取date的1月1日0点0分0秒到指定时间的片段值
判断： isSameDay/isSameInstant/isSameLocalTime
转换： parseDate/parseDateStrictly
取模： ceiling/round/truncate
时间段：iterator 注意rangeStyle=1到4表示周范围以及偏移，5和6表示月偏移
DateFormatUtils时间格式化
格式化：format/formatUTC
DurationFormatUtils时间段格式化
formatDuration/formatDurationHMS/formatDurationISO
formatPeriod/formatPeriodISO
formatDurationWords
StopWatch 秒表
start/stop/suspend/split/resume/reset/unsplit
getSplitTime/getStartTime/getTime/
toSplitString/toString
EnumUtils 枚举工具类
getEnum/getEnumIgnoreCase/getEnumList/getEnumMap
iterator
2、java反射工具类
ClassUtils 类工具
获取：
1、类和接口 ：getClass/getAllInterfaces/getAllSuperclasses/getShortClassName
2、包：getPackageName/getPackageCanonicalName
3、方法：getPublicMethod
转换：
1、toClass/convertClassesToClassNames/convertClassNamesToClasses/
2、primitivesToWrappers/primitiveToWrapper/wrappersToPrimitives/wrapperToPrimitive
判断：isAssignable/isInnerClass
MethodUtils
getAccessibleMethod/getMatchingAccessibleMethod
invokeMethod/invokeStaticMethod/invokeExactMethod/invokeExactStaticMethod
FieldUtils 字段工具类
getField/readField/writeField
getDeclaredField/readDeclaredField/writeDeclaredField
readDeclaredStaticField/readStaticField/writeDeclaredStaticField/writeStaticField
ConstructorUtils
getAccessibleConstructor/getMatchingAccessibleConstructor
invokeConstructor/invokeExactConstructor
ObjectUtils 对象工具类
max/min/toString/identityToString/appendIdentityToString/defaultIfNull
SystemUtils 系统属性工具类
getJavaHome/getJavaIoTmpDir/getJavaVersion/getUserDir/getUserHome/
isJavaAwtHeadless/isJavaVersionAtLeast
LocaleUtils 本地工具类
availableLocaleList/availableLocaleSet
countriesByLanguage
localeLookupList/toLocale/isAvailableLocale/languagesByCountry
SerializationUtils 序列化工具类
clone/deserialize/serialize
二、commons-collecions包
CollectionUtils 集合工具类
添加/删除:addAll/addIgnoreNull/retainAll/removeAll/
获取：
find/get/containsAny/index/size/sizeIsEmpty/select/selectRejected/subtract
typedCollection
判断：
isEmpty/isNotEmpty/isFull/exists/isEqualCollection/
isSubCollection/isProperSubCollection
转换：
collect/transform/transformedCollection/predicatedCollection
unmodifiableCollection/synchronizedCollection
计算：cardinality/countMatches/maxSize
过滤：filter
集合：intersection/union/disjunction 交集，并集，差集
其他操作：
reverseArray 翻转 forAllDo 给每个元素执行闭包
getCardinalityMap 转成Map,key是元素，value是次数
ListUtils-List工具类
判断： isEqualList
集合：intersection/sum/union/retainAll 交集，并集，合集，差集
操作：removeAll/hashCodeForList
子集： typedList/subtract/fixedSizeList
转换处理：synchronizedList/unmodifiableList/predicatedList/transformedList/lazyList
SetUtils-Set集合工具类
判断：isEqualSet
转换处理：
transformedSet/transformedSortedSet/predicatedSet/predicatedSortedSet
unmodifiableSet/synchronizedSet/synchronizedSortedSet
orderedSet/typedSet/typedSortedSet
操作：hashCodeForSet
MapUtils-Map工具类
获取：getObject/getString/getXXX/getXXXValue 获取指定类型值，getXXXValue 如果没有值则默认值
子集：fixedSizeMap/fixedSizeSortedMap/typedMap/typedSortedMap
判断：isEmpty/isNotEmpty
转换：
predicatedMap/predicatedSortedMap/transformedMap/transformedSortedMap/
synchronizedMap/synchronizedSortedMap/
unmodifiableMap/unmodifiableSortedMap/multiValueMap/orderedMap
toMap/toProperties/lazyMap/lazySortedMap
添加移除：safeAddToMap/putAll
其他操作：invertMap/debugPrint/verbosePrint
MultiKey - 为Map定制的多Key
Map map = new HashMap();
MultiKey multiKey = new MultiKey(key, locale);
map.put(multiKey, localizedText);
// later retireve the localized text
MultiKey multiKey = new MultiKey(key, locale);
String localizedText = (String) map.get(multiKey);
主要方法： getKey,getKeys,size
函数是编程类
// 预处理函数
AllPredicate/AndPredicate/AnyPredicate/UniquePredicate/NonePredicate/IdentityPredicate
EqualPredicate/FalsePredicate/TruePredicate/ExceptionPredicate
NullPredicate/OnePredicate/OrPredicate/InstanceofPredicate
TransformedPredicate/TransformerPredicate/NullIsFalsePredicate/NullIsTruePredicate
NotNullPredicate
NotPredicate
//闭包函数
ChainedClosure/ExceptionClosure/WhileClosure/ForClosure/IfClosure/NOPClosure
TransformerClosure/SwitchClosure/NullIsExceptionPredicate
//转换处理
ChainedTransformer/CloneTransformer/ClosureTransformer/ConstantTransformer
ExceptionTransformer/FactoryTransformer/MapTransformer/InstantiateTransformer
NOPTransformer/PredicateTransformer/StringValueTransformer/SwitchTransformer
InvokerTransformer
//工厂
ConstantFactory/ExceptionFactory/InstantiateFactory/PrototypeFactory
三、commons-io 包
FileUtils 文件操作工具类
文件夹操作：
copyDirectory/deleteDirectory/cleanDirectory/getTempDirectory/getTempDirectoryPath
moveDirectory/moveDirectoryToDirectory/moveFileToDirectory/moveToDirectory
forceMkdir/getUserDirectory/getUserDirectoryPath
文件操作：
touch/copyFile/copyURLToFile/moveFile/deleteQuietly/forceDelete/forceDeleteOnExit
toFile/toFiles/toURLs
isFileNewer/isFileOlder
readLines/readFileToByteArray/readFileToString/lineIterator/openOutputStream
write/writeLines/writeByteArrayToFile/writeStringToFile/openInputStream
其他操作：
iterateFiles/listFiles/contentEquals/sizeOf/sizeOfDirectory
IOUtils 流操作工具类
读操作：lineIterator/read/readLines
写操作：write/writeLines
转换： toInputStream/toBufferedInputStream/toByteArray/toCharArray/toString
其他操作：copy/copyLarge/contentEquals/skip/skipFully/closeQuietly
FilenameUtils 文件名工具类
获取：
getName/getBaseName/getPrefix/getPrefixLength/getExtension
getPath/getFullPath/getFullPathNoEndSeparator/getPathNoEndSeparator
判断：
isExtension/equals/equalsNormalized/equalsOnSystem
其他操作：
removeExtension/indexOfExtension
separatorsToSystem/separatorsToUnix/separatorsToWindows
indexOfLastSeparator
其他工具类
文件比较器：
CompositeFileComparator/DefaultFileComparator/DirectoryFileComparator
ExtensionFileComparator/LastModifiedFileComparator/NameFileComparator
PathFileComparator/PathFileComparator
文件过滤器：
AgeFileFilter/AndFileFilter/CanReadFileFilter/CanWriteFileFilter
DelegateFileFilter/DirectoryFileFilter/EmptyFileFilter/FalseFileFilter/FileFileFilter
FileFilterUtils/HiddenFileFilter/MagicNumberFileFilter/NameFileFilter/NotFileFilter
OrFileFilter/PrefixFileFilter/RegexFileFilter/SizeFileFilter/SuffixFileFilter
TrueFileFilter/WildcardFileFilter/WildcardFilter
四、commons-beanutils包
BeanUtils/BeanUtilsBean
拷贝： cloneBean/copyProperties/copyProperty
获取：getArrayProperty/getSimpleProperty/getProperty
其他操作：setProperty设置属性 populate将Bean设置到Map中 describe将Bean转成Map
PropertyUtils类
判断：isReadable/isWriteable
获取：
getProperty/getSimpleProperty/getPropertyType
getReadMethod/getWriteMethod/getIndexedProperty/setIndexedProperty
getMappedProperty/setMappedProperty/getNestedProperty/setNestedProperty
getPropertyDescriptor/getPropertyEditorClass
拷贝和设置：copyProperties/setProperty/setSimpleProperty /clearDescriptors
ConstructorUtils
getAccessibleConstructor/invokeConstructor/invokeExactConstructor
ConvertUtils
设置：setDefaultBoolean/setDefaultByte/setDefaultCharacter/setDefaultDouble/
setDefaultFloat/setDefaultInteger/setDefaultLong/setDefaultShort/
获取：getDefaultBoolean/getDefaultByte/getDefaultCharacter/getDefaultDouble/getDefaultFloat/
getDefaultInteger/getDefaultLong/getDefaultShort/
转换：convert/
其他：deregister/lookup/register/primitiveToWrapper/
MethodUtils
获取：getAccessibleMethod/getMatchingAccessibleMethod/getPrimitiveType/getPrimitiveWrapper
其他：invokeExactMethod/invokeMethod/isAssignmentCompatible/toNonPrimitiveClass