排名Top 16的Java实用类库

在Java中，有不少比较实用的类库，他们一般都定义了一系列具备常见功能的方法。本文总结了最经常使用的Java中的实用类以及他们的最经常使用的方法。不管是类和类中方法都是按照流行程度来排序的。

本文中列出来的类及方法都是通过大量实践的经常使用类库及方法，咱们能够直接拿过来用。固然，这些方法实现的功能咱们本身都能实现，可是既然已经有很成熟的方法能够供咱们使用了，那么就无需本身定义了。不少类和方法经过他们的名字其实能够理解出具体是作什么的。每一个方法都有一个连接，能够查看他们在开源代码中具体是如何使用的。

如下列表是经过分析50K的开源项目得出来的。

1. [org.apache.commons.io.IOUtils][1]

closeQuietly ( )

toString ( )

copy ( )

toByteArray ( )

write ( )

toInputStream ( )

readLines ( )

copyLarge ( )

lineIterator ( )

readFully ( )

2. [org.apache.commons.io.FileUtils][2]

deleteDirectory ( )

readFileToString ( )

deleteQuietly ( )

copyFile ( )

writeStringToFile ( )

forceMkdir ( )

write ( )

listFiles ( )

copyDirectory ( )

forceDelete ( )

3. [org.apache.commons.lang.StringUtils][3]

isBlank ( )

isNotBlank ( )

isEmpty ( )

isNotEmpty ( )

equals ( )

join ( )

split ( )

EMPTY

trimToNull ( )

replace ( )

4. [org.apache.http.util.EntityUtils][4]

toString ( )

consume ( )

toByteArray ( )

consumeQuietly ( )

getContentCharSet ( )

5. [org.apache.commons.lang3.StringUtils][5]

isBlank ( )

isNotBlank ( )

isEmpty ( )

isNotEmpty ( )

join ( )

equals ( )

split ( )

EMPTY

replace ( )

capitalize ( )

6. [org.apache.commons.io.FilenameUtils][6]

getExtension ( )

getBaseName ( )

getName ( )

concat ( )

removeExtension ( )

normalize ( )

wildcardMatch ( )

separatorsToUnix ( )

getFullPath ( )

isExtension ( )

7. [org.springframework.util.StringUtils][7]

hasText ( )

hasLength ( )

isEmpty ( )

commaDelimitedListToStringArray ( )

collectionToDelimitedString ( )

replace ( )

delimitedListToStringArray ( )

uncapitalize ( )

collectionToCommaDelimitedString ( )

tokenizeToStringArray ( )

8. [org.apache.commons.lang.ArrayUtils][8]

contains ( )

addAll ( )

clone ( )

isEmpty ( )

add ( )

EMPTY_BYTE_ARRAY

subarray ( )

indexOf ( )

isEquals ( )

toObject ( )

9. [org.apache.commons.lang.StringEscapeUtils][9]

escapeHtml ( )

unescapeHtml ( )

escapeXml ( )

escapeSql ( )

unescapeJava ( )

escapeJava ( )

escapeJavaScript ( )

unescapeXml ( )

unescapeJavaScript ( )

10. [org.apache.http.client.utils.URLEncodedUtils][10]

format ( )

parse ( )

11. [org.apache.commons.codec.digest.DigestUtils][11]

md5Hex ( )

shaHex ( )

sha256Hex ( )

sha1Hex ( )

sha ( )

md5 ( )

sha512Hex ( )

sha1 ( )

12. [org.apache.commons.collections.CollectionUtils][12]

isEmpty ( )

isNotEmpty ( )

select ( )

transform ( )

filter ( )

find ( )

collect ( )

forAllDo ( )

addAll ( )

isEqualCollection ( )

13. [org.apache.commons.lang3.ArrayUtils][13]

contains ( )

isEmpty ( )

isNotEmpty ( )

add ( )

clone ( )

addAll ( )

subarray ( )

indexOf ( )

EMPTY_OBJECT_ARRAY

EMPTY_STRING_ARRAY

14. [org.apache.commons.beanutils.PropertyUtils][14]

getProperty ( )

setProperty ( )

getPropertyDescriptors ( )

isReadable ( )

copyProperties ( )

getPropertyDescriptor ( )

getSimpleProperty ( )

isWriteable ( )

setSimpleProperty ( )

getPropertyType ( )

15. [org.apache.commons.lang3.StringEscapeUtils][15]

unescapeHtml4 ( )

escapeHtml4 ( )

escapeXml ( )

unescapeXml ( )

escapeJava ( )

escapeEcmaScript ( )

unescapeJava ( )

escapeJson ( )

escapeXml10 ( )

16. [org.apache.commons.beanutils.BeanUtils][16]

copyProperties ( )

getProperty ( )

setProperty ( )

describe ( )

populate ( )

copyProperty ( )

cloneBean ( )

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