apache-comnons系列之commons-io-2.5 org.apache.commons.io.FileUtils学习笔记

apache-comnons系列之commons-io-2.5 org.apache.commons.io.FileUtils学习笔记

概述

Facilities are provided in the following areas:

writing to a file

reading from a file

converting to and from a URL

comparing file content

file last changed date

calculating a checksum

make a directory including parent directories

copying files and directories

deleting files and directories

listing files and directories by filter and extension

测试

org.apache.commons.io.FileUtilsTestCase

directory

forceMkdir

Makes a directory, including any necessary but nonexistent parent directories.

copyFile

This method copies the contents of the specified source file to the specified destination file. The directory holding the destination file is created if it does not exist. If the destination file exists, then this method will overwrite it

doCopyFile完成复制

deleteDirectory

Deletes a directory recursively

cleanDirectory/directory.delete

listFiles

Finds files within a given directory (and optionally its subdirectories). All files found are filtered by an IOFileFilter.

innerListFiles–FileFilterUtils.or–directory.listFiles((FileFilter) filter)

file

getFile/toFile

Construct a file from the set of name elements

openInputStream/openOutputStream

toURLs

Converts each of an array of

File

to a

URL

.

isFileNewer

Tests if the specified

File

is newer than the reference

File

.

byteCountToDisplaySize

Returns a human-readable version of the file size, where the input represents a specific number of bytes

contentEquals

This method checks to see if the two files are different lengths or if they point to the same file, before resorting to byte-by-byte comparison of the contents.

IOUtils.contentEquals(input1, input2)

FilenameUtils

This class defines six components within a filename

(example C:\dev\project\file.txt):

the prefix - C:\

the path - dev\project\

the full path - C:\dev\project\

the name - file.txt

the base name - file

the extension - txt