這篇文章展示了最常用的Java實用工具類及其最常用的方法。類列表及其方法列表均按受歡迎程度排序。數據基于從GitHub隨機選擇的50,000個開源Java項目。
希望您可以通過瀏覽列表來了解已經提供和流行的功能的一些想法，以使您知道不需要自己實現。這些方法的名稱通常指示它們的作用。如果方法名稱不夠直觀，您還可以查看其他開發人員如何在其開源項目中使用它們。
1.org.apache.commons.io.IOUtils
closeQuietly()
toString()
copy()
toByteArray()
write()
toInputStream()
readLines()
copyLarge()
lineIterator()
readFully()
2.org.apache.commons.io.FileUtils
deleteDirectory()
readFileToString()
deleteQuietly()
copyFile()
writeStringToFile()
forceMkdir()
write()
listFiles()
copyDirectory()
forceDelete()
3.org.apache.commons.lang.StringUtils
isBlank()
isNotBlank()
isEmpty()
isNotEmpty()
equals()
join()
split()
EMPTY
trimToNull()
replace()
4.org.apache.http.util.EntityUtils
toString()
consume()
toByteArray()
consumeQuietly()
getContentCharSet()
5.org.apache.commons.lang3.StringUtils
isBlank()
isNotBlank()
isEmpty()
isNotEmpty()
join()
equals()
split()
EMPTY
replace()
capitalize()
6.org.apache.commons.io.FilenameUtils
getExtension()
getBaseName()
getName()
concat()
removeExtension()
normalize()
wildcardMatch()
separatorsToUnix()
getFullPath()
isExtension()
7.org.springframework.util.StringUtils
hasText()
hasLength()
isEmpty()
commaDelimitedListToStringArray()
collectionToDelimitedString()
replace()
delimitedListToStringArray()
uncapitalize()
collectionToCommaDelimitedString()
tokenizeToStringArray()
8.org.apache.commons.lang.ArrayUtils
contains()
addAll()
clone()
isEmpty()
add()
EMPTY_BYTE_ARRAY
subarray()
indexOf()
isEquals()
toObject()
9.org.apache.commons.lang.StringEscapeUtils
escapeHtml()
unescapeHtml()
escapeXml()
escapeSql()
unescapeJava()
escapeJava()
escapeJavaScript()
unescapeXml()
unescapeJavaScript()
10.org.apache.http.client.utils.URLEncodedUtils
format()
parse()
11.org.apache.commons.codec.digest.DigestUtils
md5Hex()
shaHex()
sha256Hex()
sha1Hex()
sha()
md5()
sha512Hex()
sha1()
12.org.apache.commons.collections.CollectionUtils
isEmpty()
isNotEmpty()
select()
transform()
filter()
find()
collect()
forAllDo()
addAll()
isEqualCollection()
13.org.apache.commons.lang3.ArrayUtils
contains()
isEmpty()
isNotEmpty()
add()
clone()
addAll()
subarray()
indexOf()
EMPTY_OBJECT_ARRAY
EMPTY_STRING_ARRAY
14.org.apache.commons.beanutils.PropertyUtils
getProperty()
setProperty()
getPropertyDescriptors()
isReadable()
copyProperties()
getPropertyDescriptor()
getSimpleProperty()
isWriteable()
setSimpleProperty()
getPropertyType()
15.org.apache.commons.lang3.StringEscapeUtils
unescapeHtml4()
escapeHtml4()
escapeXml()
unescapeXml()
escapeJava()
escapeEcmaScript()
unescapeJava()
escapeJson()
escapeXml10()
16.org.apache.commons.beanutils.BeanUtils
copyProperties()
getProperty()
setProperty()
describe()
populate()
copyProperty()
cloneBean()
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來源：https://www.programcreek.com/
