常用的16个Java实用工具类，Java开发人员请收藏！

在Java中，实用程序类是一个定义一组执行常用功能的方法的类。这篇文章展示了最常用的Java实用程序类及其最常用的方法。类列表及其方法列表都按流行度排序。该数据基于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获得已经提供和流行的一些想法，这样您就不需要自己编程了。这些方法的名称通常表明它们的作用。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他们的开源项目中使用它们。

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 ( )