在Java中，有很多比较实用的类库，他们通常都定义了一系列具有常见功能的方法。本文总结了最常用的Java中的实用类以及他们的最常用的方法。无论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经过大量实践的常用类库及方法，我们可以直接拿过来用。当然，这些方法实现的功能我们自己都能实现，但是既然已经有很成熟的方法可以供我们使用了，那么就无需自己定义了。很多类和方法通过他们的名字其实可以理解出具体是做什么的。每个方法都有一个链接，可以查看他们在开源代码中具体是如何使用的。
以下列表是通过分析50K的开源项目得出来的。
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
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
11. org.apache.commons.codec.digest.DigestUtils
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 (
)
(全文完)
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