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 ( )