Java常用类库 | 易学教程

##常用类库 [TOC] ###IO工具类org.apache.commons.io.IOUtils

####closeQuietly ( ) 无条件的关闭Closeable InputStream OutputStream Reader Selector ServerSocket Socket Writer 。

####toString ( ) 将byte[] InputStream Reader URI URL资源内容转为字符串

####copy ( )

copy(InputStream input, OutputStream output)
copy(InputStream input, Writer output, Charset inputEncoding)
copy(Reader input, OutputStream output, Charset outputEncoding) //会调用flush
copy(Reader input, Writer output)

copyLarge //大于2GB

####toByteArray ( ) 将 InputStream Reader String URI URL资源内容转为byte[]

####write ( )

void write(byte[] data, OutputStream output) //将data写入OutPutStream
void write(char[] data, Writer output)
void write(CharSequence data, Writer output)

writeChunked //using chunked writes.

//lineEnding默认null
void writeLines(Collection<?> lines, String lineEnding, OutputStream output, Charset encoding)

####toInputStream ( ) 将 CharSequence 转为InputStream

####readLines ( ) static List<String> readLines(InputStream input, Charset encoding)

static List<String>	readLines(Reader input)

####lineIterator ( ) static LineIterator lineIterator(InputStream input, Charset encoding)

static LineIterator	lineIterator(Reader reader)

####readFully ( ) 读取指定数量的字节，如果不够则返回失败

###文件操作工具类org.apache.commons.io.FileUtils

####deleteDirectory ( ) 递归的删除一个目录 ####readFileToString ( ) ####deleteQuietly ( ) 删除文件及子目录文件，不抛出异常，删除目标可以为空

####copyFile ( ) copyDirectoryToDirectory //复制文件夹到另一个文件夹下，保留文件日期 copyFile //复制文件，保留日期可选，或copy到OutoutStream copyFileToDirectory //复制文件保留文件日期可选 copyInputStreamToFile copyToFile //和copyInputStreamToFile一样 copyURLToFile //保存url资源到目标文件

####writeStringToFile ( ) ####forceMkdir ( ) 创建目录 ####write ( ) write(File file, CharSequence data, Charset encoding) //文件不存在则创建 static void write(File file, CharSequence data, Charset encoding, boolean append)//是否追加写 static void writeByteArrayToFile(File file, byte[] data) static void writeLines(File file, Collection<?> lines) ####listFiles ( ) static Collection<File> listFiles(File directory, IOFileFilter fileFilter, IOFileFilter dirFilter) //Finds files within a given directory (and optionally its subdirectories).

static Collection<File>	listFiles(File directory, String[] extensions, boolean recursive)
//Finds files within a given directory (and optionally its subdirectories) which match an array of extensions.

static Collection<File>	listFilesAndDirs(File directory, IOFileFilter fileFilter, IOFileFilter dirFilter)
//Finds files within a given directory (and optionally its subdirectories).

####copyDirectory ( ) static void copyDirectory(File srcDir, File destDir) //Copies a whole directory to a new location preserving the file dates. static void copyDirectory(File srcDir, File destDir, boolean preserveFileDate) //Copies a whole directory to a new location. static void copyDirectory(File srcDir, File destDir, FileFilter filter) //Copies a filtered directory to a new location preserving the file dates. static void copyDirectory(File srcDir, File destDir, FileFilter filter, boolean preserveFileDate) //Copies a filtered directory to a new location. static void copyDirectoryToDirectory(File srcDir, File destDir) //Copies a directory to within another directory preserving the file dates. ####forceDelete ( ) static void forceDelete(File file) //Deletes a file. static void forceDeleteOnExit(File file) //Schedules a file to be deleted when JVM exits.

###字符串工具类 org.apache.commons.lang3.StringUtils

isBlank ( ) isNotBlank ( ) isEmpty ( ) isNotEmpty ( ) join ( ) equals ( ) split ( ) EMPTY replace ( ) capitalize ( )

org.apache.http.util.EntityUtils

toString ( ) consume ( ) toByteArray ( ) consumeQuietly ( ) getContentCharSet ( )

org.apache.commons.io.FilenameUtils

getExtension ( ) getBaseName ( ) getName ( ) concat ( ) removeExtension ( ) normalize ( ) wildcardMatch ( ) separatorsToUnix ( ) getFullPath ( ) isExtension ( )

org.springframework.util.StringUtils

hasText ( ) hasLength ( ) isEmpty ( ) commaDelimitedListToStringArray ( ) collectionToDelimitedString ( ) replace ( ) delimitedListToStringArray ( ) uncapitalize ( ) collectionToCommaDelimitedString ( ) tokenizeToStringArray ( )

org.apache.commons.lang.ArrayUtils

contains ( ) addAll ( ) clone ( ) isEmpty ( ) add ( ) EMPTY_BYTE_ARRAY subarray ( ) indexOf ( ) isEquals ( ) toObject ( )

###org.apache.commons.lang.StringEscapeUtils

escapeHtml ( ) unescapeHtml ( ) escapeXml ( ) escapeSql ( ) unescapeJava ( ) escapeJava ( ) escapeJavaScript ( ) unescapeXml ( ) unescapeJavaScript ( )

###org.apache.http.client.utils.URLEncodedUtils

format ( ) parse ( )

org.apache.commons.codec.digest.DigestUtils

md5Hex ( ) shaHex ( ) sha256Hex ( ) sha1Hex ( ) sha ( ) md5 ( ) sha512Hex ( ) sha1 ( )

###org.apache.commons.collections.CollectionUtils

isEmpty ( ) isNotEmpty ( ) select ( ) transform ( ) filter ( ) find ( ) collect ( ) forAllDo ( ) addAll ( ) isEqualCollection ( )

###org.apache.commons.lang3.ArrayUtils

contains ( ) isEmpty ( ) isNotEmpty ( ) add ( ) clone ( ) addAll ( ) subarray ( ) indexOf ( ) EMPTY_OBJECT_ARRAY EMPTY_STRING_ARRAY

org.apache.commons.beanutils.PropertyUtils

getProperty ( ) setProperty ( ) getPropertyDescriptors ( ) isReadable ( ) copyProperties ( ) getPropertyDescriptor ( ) getSimpleProperty ( ) isWriteable ( ) setSimpleProperty ( ) getPropertyType ( )

###org.apache.commons.lang3.StringEscapeUtils

unescapeHtml4 ( ) escapeHtml4 ( ) escapeXml ( ) unescapeXml ( ) escapeJava ( ) escapeEcmaScript ( ) unescapeJava ( ) escapeJson ( ) escapeXml10 ( )

###org.apache.commons.beanutils.BeanUtils

copyProperties ( ) getProperty ( ) setProperty ( ) describe ( ) populate ( ) copyProperty ( ) cloneBean ( )

来源：oschina

链接：https://my.oschina.net/u/256606/blog/779747

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