优质文章，及时送达

作者 ： Java 葵花宝典

来源 ：programcreek.com/2015/12/top-10-java-utility-classes/

在Java中，实用程序类是定义一组执行通用功能的方法的类。

这篇文章展示了最常用的Java实用工具类及其最常用的方法。类列表及其方法列表均按受欢迎程度排序。数据基于从GitHub随机选择的50,000个开源Java项目。

希望您可以通过浏览列表来了解已经提供和流行的功能的一些想法，以使您知道不需要自己实现。这些方法的名称通常指示它们的作用。如果方法名称不够直观，您还可以查看其他开发人员如何在其开源项目中使用它们。

org. apache .commons. io .IOUtils

 closeQuietly  
toString 
copy 
toByteArray 
write 
toInputStream 
readLines 
copyLarge 
lineIterator 
readFully  

org.apache.commons.io.FileUtils

 deleteDirectory  
readFileToString 
deleteQuietly 
copyFile 
writeStringToFile 
forceMkdir 
write 
listFiles 
copyDirectory 
forceDelete  

org.apache.commons.lang.StringUtils

 isBlank  
isNotBlank 
isEmpty 
isNotEmpty 
equals 
join 
split 
EMPTY 
trimTo 
replace  

org.apache.http.util.EntityUtils

 toString  
 consume  
toByteArray 
consumeQuietly 
getContentCharSet  

org.apache.commons.lang3.StringUtils

 isBlank  
isNotBlank 
isEmpty 
isNotEmpty 
join 
equals 
split 
EMPTY 
replace 
capitalize  

 getExtension  
getBaseName 
getName 
concat 
removeExtension 
normalize 
wildcardMatch 
separatorsToUnix 
getFullPath 
isExtension  

org.springframework.util.StringUtils

 hasText  
hasLength 
isEmpty 
commaDelimitedListToStringArray 
collectionToDelimitedString 
replace 
delimitedListToStringArray 
uncapitalize 
collectionToCommaDelimitedString 
tokenizeToStringArray  

org.apache.commons.lang.ArrayUtils

 contains  
addAll 
clone 
isEmpty 
add 
EMPTY_BYTE_ARRAY 
subarray 
indexOf 
isEquals 
toObject  

org.apache.commons.lang.StringEscapeUtils

 escapeHtml  
unescapeHtml 
escapeXml 
escapeSql 
unescapeJava 
escapeJava 
escapeJavaScript 
unescapeXml 
unescapeJavaScript  

org.apache.http.client.utils.URLEncodedUtils

 format  
parse  

org.apache.commons.codec.digest.DigestUtils

 md5Hex  
shaHex 
sha256Hex 
sha1Hex 
sha 
md5 
sha512Hex 
sha1  

org.apache.commons.collections.CollectionUtils

 isEmpty  
isNotEmpty 
select 
transform 
filter 
find 
collect 
forAllDo 
addAll 
isEqualCollection  

org.apache.commons.lang3.ArrayUtils

 contains  
isEmpty 
isNotEmpty 
add 
clone 
addAll 
subarray 
indexOf 
EMPTY_OBJECT_ARRAY 
EMPTY_STRING_ARRAY  

org.apache.commons.beanutils.PropertyUtils

 getProperty  
setProperty 
getPropertyDescriptors 
isReadable 
copyProperties 
getPropertyDescriptor 
getSimpleProperty 
isWriteable 
setSimpleProperty 
getPropertyType  

org.apache.commons.lang3.StringEscapeUtils

 unescapeHtml4  
escapeHtml4 
escapeXml 
unescapeXml 
escapeJava 
escapeEcmaScript 
unescapeJava 
escapeJson 
escapeXml10  

org.apache.commons.beanutils.BeanUtils

 copyProperties  
getProperty 
setProperty 
describe 
populate 
copyProperty 
cloneBean  

 
 
 
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