Top 16 Java 应用类 － 这些功能再也不用自己写了

Java中有许多应用类，这些类定义静态方法可以解决很多常见的问题。下面是通过5万个开源项目统计得到的最热门的16个应用类。 类按热门程序排列，类的方法也是按热门程序排序。

浏览这个类可以看看有哪些功能不用再自己写了。 非常有用。 点击链接可以看到具体使用的示例。 原文转自：http://www.programcreek.com/2015/12/top-10-java-utility-classes/

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 ( )