Top 16 Java 应用类 － 这些功能再也不用自己写了

Java中有很多应用类。这些类定义静态方法能够解决非常多常见的问题。以下是通过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。

浏览这个类能够看看有哪些功能不用再自己写了。 很实用。 点击链接能够看到详细使用的演示样例。 原文转自： http://www.programcreek.com/2015/12/top-10-java-utility-classes/

1. org.apache.commons.io.IOUtils

• class=org.apache.commons.io.IOUtils&method=closeQuietly" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">closeQuietly ( )

• toString ( )

• class=org.apache.commons.io.IOUtils&method=copy" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">copy ( )

• toByteArray ( )
• write ( )
• toInputStream ( )
• readLines ( )
• copyLarge ( )
• lineIterator ( )
• readFully ( )

2. org.apache.commons.io.FileUtils

• deleteDirectory ( )
• readFileToString ( )
• deleteQuietly ( )

• class=org.apache.commons.io.FileUtils&method=copyFile" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">copyFile ( )

• writeStringToFile ( )

• class=org.apache.commons.io.FileUtils&method=forceMkdir" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">forceMkdir ( )

• write ( )
• listFiles ( )
• copyDirectory ( )
• forceDelete ( )

3. org.apache.commons.lang.StringUtils

• isBlank ( )

• class=org.apache.commons.lang.StringUtils&method=isNotBlank" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">isNotBlank ( )

• class=org.apache.commons.lang.StringUtils&method=isEmpty" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">isEmpty ( )

• isNotEmpty ( )
• equals ( )
• join ( )
• split ( )
• EMPTY
• trimToNull ( )
• replace ( )

4. 

api=org.apache.http.util.EntityUtils" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">org.apache.http.util.EntityUtils

• class=org.apache.http.util.EntityUtils&method=toString" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">toString ( )

• consume ( )
• toByteArray ( )
• consumeQuietly ( )
• getContentCharSet (
  )

5. org.apache.commons.lang3.StringUtils

• isBlank ( )
• isNotBlank ( )
• isEmpty ( )
• isNotEmpty ( )

• class=org.apache.commons.lang3.StringUtils&method=join" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">join ( )

• equals ( )
• split ( )
• EMPTY
• replace ( )

• class=org.apache.commons.lang3.StringUtils&method=capitalize" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">capitalize ( )

6. org.apache.commons.io.FilenameUtils

• class=org.apache.commons.io.FilenameUtils&method=getExtension" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">getExtension ( )

• getBaseName ( )
• getName ( )
• concat ( )
• removeExtension ( )

• class=org.apache.commons.io.FilenameUtils&method=normalize" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">normalize ( )

• class=org.apache.commons.io.FilenameUtils&method=wildcardMatch" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">wildcardMatch ( )

• class=org.apache.commons.io.FilenameUtils&method=separatorsToUnix" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">separatorsToUnix (
  )

• getFullPath ( )
• isExtension ( )

7. org.springframework.util.StringUtils

• hasText ( )
• hasLength ( )

• class=org.springframework.util.StringUtils&method=isEmpty" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">isEmpty ( )

• commaDelimitedListToStringArray
  ( )
• collectionToDelimitedString
  ( )
• replace ( )
• delimitedListToStringArray
  ( )

• class=org.springframework.util.StringUtils&method=uncapitalize" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">uncapitalize ( )

• class=org.springframework.util.StringUtils&method=collectionToCommaDelimitedString" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">collectionToCommaDelimitedString
  ( )

• class=org.springframework.util.StringUtils&method=tokenizeToStringArray" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">tokenizeToStringArray
  ( )

8. org.apache.commons.lang.ArrayUtils

• class=org.apache.commons.lang.ArrayUtils&method=contains" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">contains ( )

• addAll ( )
• clone ( )

• class=org.apache.commons.lang.ArrayUtils&method=isEmpty" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">isEmpty ( )

• add ( )
• EMPTY_BYTE_ARRAY
• subarray ( )
• indexOf ( )
• isEquals ( )

• class=org.apache.commons.lang.ArrayUtils&method=toObject" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">toObject ( )

9. 

api=org.apache.commons.lang.StringEscapeUtils" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">org.apache.commons.lang.StringEscapeUtils

• class=org.apache.commons.lang.StringEscapeUtils&method=escapeHtml" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">escapeHtml ( )

• class=org.apache.commons.lang.StringEscapeUtils&method=unescapeHtml" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">unescapeHtml ( )

• escapeXml ( )
• escapeSql ( )
• unescapeJava ( )
• escapeJava ( )
• escapeJavaScript
  ( )
• unescapeXml ( )
• unescapeJavaScript
  ( )

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

• class=org.apache.http.client.utils.URLEncodedUtils&method=format" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">format ( )

• parse ( )

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

• class=org.apache.commons.codec.digest.DigestUtils&method=md5Hex" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">md5Hex ( )

• shaHex ( )
• sha256Hex ( )

• class=org.apache.commons.codec.digest.DigestUtils&method=sha1Hex" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">sha1Hex ( )

• sha ( )
• md5 ( )
• sha512Hex ( )

• class=org.apache.commons.codec.digest.DigestUtils&method=sha1" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">sha1 ( )

12. org.apache.commons.collections.CollectionUtils

• isEmpty ( )

• class=org.apache.commons.collections.CollectionUtils&method=isNotEmpty" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">isNotEmpty (
  )

• select ( )
• transform ( )
• filter ( )
• find ( )
• collect ( )
• forAllDo ( )

• class=org.apache.commons.collections.CollectionUtils&method=addAll" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">addAll ( )

• isEqualCollection
  ( )

13. org.apache.commons.lang3.ArrayUtils

• class=org.apache.commons.lang3.ArrayUtils&method=contains" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">contains ( )

• isEmpty ( )
• isNotEmpty ( )
• add ( )
• clone ( )
• addAll ( )
• subarray ( )
• indexOf ( )
• EMPTY_OBJECT_ARRAY

• class=org.apache.commons.lang3.ArrayUtils&method=EMPTY_STRING_ARRAY" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">EMPTY_STRING_ARRAY

14. org.apache.commons.beanutils.PropertyUtils

• getProperty ( )
• setProperty ( )

• class=org.apache.commons.beanutils.PropertyUtils&method=getPropertyDescriptors" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">getPropertyDescriptors
  ( )

• class=org.apache.commons.beanutils.PropertyUtils&method=isReadable" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">isReadable ( )

• copyProperties
  ( )
• getPropertyDescriptor
  ( )
• getSimpleProperty
  ( )
• isWriteable ( )
• setSimpleProperty
  ( )

• class=org.apache.commons.beanutils.PropertyUtils&method=getPropertyType" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">getPropertyType
  ( )

15. 

api=org.apache.commons.lang3.StringEscapeUtils" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">org.apache.commons.lang3.StringEscapeUtils

• unescapeHtml4
  ( )
• escapeHtml4 ( )
• escapeXml ( )

• class=org.apache.commons.lang3.StringEscapeUtils&method=unescapeXml" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">unescapeXml ( )

• escapeJava ( )
• escapeEcmaScript
  ( )
• unescapeJava (
  )
• escapeJson ( )

• class=org.apache.commons.lang3.StringEscapeUtils&method=escapeXml10" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">escapeXml10 ( )

16. 

api=org.apache.commons.beanutils.BeanUtils" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">org.apache.commons.beanutils.BeanUtils

• copyProperties (
  )
• getProperty ( )
• setProperty ( )
• describe ( )
• populate ( )

• class=org.apache.commons.beanutils.BeanUtils&method=copyProperty" style="margin:0px; padding:0px; text-decoration:none; color:rgb(3,57,143)">copyProperty ( )

• cloneBean ( )

* The utility classes from android are excluded since they are designed for Android apps. If you want to see more details, you can search "utils" in the search portal:http://www.programcreek.com/java-api-examples/index.php.
If the name of a utility class does not contain "utils", the class is not selected.

Also org.apache.commons.lang is the old version of import org.apache.commons.lang3.