cn.trinea.android.common.util

类 FileUtils

java.lang.Object

cn.trinea.android.common.util.FileUtils

public class FileUtils
extends Object

File Utils

Read or write file
• #readFile(String) read file
• #readFileToList(String) read file to string list
• writeFile(String, String, boolean) write file from String
• writeFile(String, String) write file from String
• writeFile(String, List, boolean) write file from String List
• writeFile(String, List) write file from String List
• writeFile(String, InputStream) write file
• writeFile(String, InputStream, boolean) write file
• writeFile(File, InputStream) write file
• writeFile(File, InputStream, boolean) write file

Operate file
• copyFile(String, String)
• getFileExtension(String)
• getFileName(String)
• getFileNameWithoutExtension(String)
• getFileSize(String)
• deleteFile(String)
• isFileExist(String)
• isFolderExist(String)
• makeFolders(String)
• makeDirs(String)

作者:

Trinea 2012-5-12

字段概要

字段

限定符和类型	字段和说明
static String	FILE_EXTENSION_SEPARATOR

构造器概要

构造器

构造器和说明
FileUtils()

方法概要

方法

限定符和类型	方法和说明
static boolean	copyFile(String sourceFilePath, String destFilePath) copy file
static boolean	deleteFile(String path) delete file or directory if path is null or empty, return true if path not exist, return true if path exist, delete recursion. return true
static String	getFileExtension(String filePath) get suffix of file from path getFileExtension(null) = "" getFileExtension("") = "" getFileExtension(" ") = " " getFileExtension("a.mp3") = "mp3" getFileExtension("a.b.rmvb") = "rmvb" getFileExtension("abc") = "" getFileExtension("c:\\") = "" getFileExtension("c:\\a") = "" getFileExtension("c:\\a.b") = "b" getFileExtension("c:a.txt\\a") = "" getFileExtension("/home/admin") = "" getFileExtension("/home/admin/a.txt/b") = "" getFileExtension("/home/admin/a.txt/b.mp3") = "mp3"
static String	getFileName(String filePath) get file name from path, include suffix getFileName(null) = null getFileName("") = "" getFileName(" ") = " " getFileName("a.mp3") = "a.mp3" getFileName("a.b.rmvb") = "a.b.rmvb" getFileName("abc") = "abc" getFileName("c:\\") = "" getFileName("c:\\a") = "a" getFileName("c:\\a.b") = "a.b" getFileName("c:a.txt\\a") = "a" getFileName("/home/admin") = "admin" getFileName("/home/admin/a.txt/b.mp3") = "b.mp3"
static String	getFileNameWithoutExtension(String filePath) get file name from path, not include suffix getFileNameWithoutExtension(null) = null getFileNameWithoutExtension("") = "" getFileNameWithoutExtension(" ") = " " getFileNameWithoutExtension("abc") = "abc" getFileNameWithoutExtension("a.mp3") = "a" getFileNameWithoutExtension("a.b.rmvb") = "a.b" getFileNameWithoutExtension("c:\\") = "" getFileNameWithoutExtension("c:\\a") = "a" getFileNameWithoutExtension("c:\\a.b") = "a" getFileNameWithoutExtension("c:a.txt\\a") = "a" getFileNameWithoutExtension("/home/admin") = "admin" getFileNameWithoutExtension("/home/admin/a.txt/b.mp3") = "b"
static long	getFileSize(String path) get file size if path is null or empty, return -1 if path exist and it is a file, return file size, else return -1
static String	getFolderName(String filePath) get folder name from path getFolderName(null) = null getFolderName("") = "" getFolderName(" ") = "" getFolderName("a.mp3") = "" getFolderName("a.b.rmvb") = "" getFolderName("abc") = "" getFolderName("c:\\") = "c:" getFolderName("c:\\a") = "c:" getFolderName("c:\\a.b") = "c:" getFolderName("c:a.txt\\a") = "c:a.txt" getFolderName("c:a\\b\\c\\d.txt") = "c:a\\b\\c" getFolderName("/home/admin") = "/home" getFolderName("/home/admin/a.txt/b.mp3") = "/home/admin/a.txt"
static boolean	isFileExist(String filePath) Indicates if this file represents a file on the underlying file system.
static boolean	isFolderExist(String directoryPath) Indicates if this file represents a directory on the underlying file system.
static boolean	makeDirs(String filePath) Creates the directory named by the trailing filename of this file, including the complete directory path required to create this directory.
static boolean	makeFolders(String filePath)
static StringBuilder	readFile(String filePath, String charsetName) read file
static List<String>	readFileToList(String filePath, String charsetName) read file to string list, a element of list is a line
static boolean	writeFile(File file, InputStream stream) write file, the bytes will be written to the begin of the file
static boolean	writeFile(File file, InputStream stream, boolean append) write file
static boolean	writeFile(String filePath, InputStream stream) write file, the bytes will be written to the begin of the file
static boolean	writeFile(String filePath, InputStream stream, boolean append) write file
static boolean	writeFile(String filePath, List<String> contentList) write file, the string list will be written to the begin of the file
static boolean	writeFile(String filePath, List<String> contentList, boolean append) write file
static boolean	writeFile(String filePath, String content) write file, the string will be written to the begin of the file
static boolean	writeFile(String filePath, String content, boolean append) write file

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

FILE_EXTENSION_SEPARATOR

public static final String FILE_EXTENSION_SEPARATOR

另请参阅:

常量字段值

构造器详细资料

FileUtils

public FileUtils()

方法详细资料

readFile

public static StringBuilder readFile(String filePath,
                     String charsetName)

read file

参数:

filePath -

charsetName - The name of a supported charset

返回:

if file not exist, return null, else return content of file

抛出:

RuntimeException - if an error occurs while operator BufferedReader

writeFile

public static boolean writeFile(String filePath,
                String content,
                boolean append)

write file

参数:

filePath -

content -

append - is append, if true, write to the end of file, else clear content of file and write into it

返回:

return false if content is empty, true otherwise

抛出:

RuntimeException - if an error occurs while operator FileWriter

writeFile

public static boolean writeFile(String filePath,
                List<String> contentList,
                boolean append)

write file

参数:

filePath -

contentList -

append - is append, if true, write to the end of file, else clear content of file and write into it

返回:

return false if contentList is empty, true otherwise

抛出:

RuntimeException - if an error occurs while operator FileWriter

writeFile

public static boolean writeFile(String filePath,
                String content)

write file, the string will be written to the begin of the file

参数:

filePath -

content -

返回:

writeFile

public static boolean writeFile(String filePath,
                List<String> contentList)

write file, the string list will be written to the begin of the file

参数:

filePath -

contentList -

返回:

writeFile

public static boolean writeFile(String filePath,
                InputStream stream)

write file, the bytes will be written to the begin of the file

参数:

filePath -

stream -

返回:

另请参阅:

#writeFile(String, InputStream, boolean)}

writeFile

public static boolean writeFile(String filePath,
                InputStream stream,
                boolean append)

write file

参数:

file - the file to be opened for writing.

stream - the input stream

append - if true, then bytes will be written to the end of the file rather than the beginning

返回:

return true

抛出:

RuntimeException - if an error occurs while operator FileOutputStream

writeFile

public static boolean writeFile(File file,
                InputStream stream)

write file, the bytes will be written to the begin of the file

参数:

file -

stream -

返回:

另请参阅:

#writeFile(File, InputStream, boolean)}

writeFile

public static boolean writeFile(File file,
                InputStream stream,
                boolean append)

write file

参数:

file - the file to be opened for writing.

stream - the input stream

append - if true, then bytes will be written to the end of the file rather than the beginning

返回:

return true

抛出:

RuntimeException - if an error occurs while operator FileOutputStream

copyFile

public static boolean copyFile(String sourceFilePath,
               String destFilePath)

copy file

参数:

sourceFilePath -

destFilePath -

返回:

抛出:

RuntimeException - if an error occurs while operator FileOutputStream

readFileToList

public static List<String> readFileToList(String filePath,
                          String charsetName)

read file to string list, a element of list is a line

参数:

filePath -

charsetName - The name of a supported charset

返回:

if file not exist, return null, else return content of file

抛出:

RuntimeException - if an error occurs while operator BufferedReader

getFileNameWithoutExtension

public static String getFileNameWithoutExtension(String filePath)

get file name from path, not include suffix

      getFileNameWithoutExtension(null)               =   null
      getFileNameWithoutExtension("")                 =   ""
      getFileNameWithoutExtension("   ")              =   "   "
      getFileNameWithoutExtension("abc")              =   "abc"
      getFileNameWithoutExtension("a.mp3")            =   "a"
      getFileNameWithoutExtension("a.b.rmvb")         =   "a.b"
      getFileNameWithoutExtension("c:\\")              =   ""
      getFileNameWithoutExtension("c:\\a")             =   "a"
      getFileNameWithoutExtension("c:\\a.b")           =   "a"
      getFileNameWithoutExtension("c:a.txt\\a")        =   "a"
      getFileNameWithoutExtension("/home/admin")      =   "admin"
      getFileNameWithoutExtension("/home/admin/a.txt/b.mp3")  =   "b"
 

参数:

filePath -

返回:

file name from path, not include suffix

另请参阅:

getFileName

public static String getFileName(String filePath)

get file name from path, include suffix

      getFileName(null)               =   null
      getFileName("")                 =   ""
      getFileName("   ")              =   "   "
      getFileName("a.mp3")            =   "a.mp3"
      getFileName("a.b.rmvb")         =   "a.b.rmvb"
      getFileName("abc")              =   "abc"
      getFileName("c:\\")              =   ""
      getFileName("c:\\a")             =   "a"
      getFileName("c:\\a.b")           =   "a.b"
      getFileName("c:a.txt\\a")        =   "a"
      getFileName("/home/admin")      =   "admin"
      getFileName("/home/admin/a.txt/b.mp3")  =   "b.mp3"
 

参数:

filePath -

返回:

file name from path, include suffix

getFolderName

public static String getFolderName(String filePath)

get folder name from path

      getFolderName(null)               =   null
      getFolderName("")                 =   ""
      getFolderName("   ")              =   ""
      getFolderName("a.mp3")            =   ""
      getFolderName("a.b.rmvb")         =   ""
      getFolderName("abc")              =   ""
      getFolderName("c:\\")              =   "c:"
      getFolderName("c:\\a")             =   "c:"
      getFolderName("c:\\a.b")           =   "c:"
      getFolderName("c:a.txt\\a")        =   "c:a.txt"
      getFolderName("c:a\\b\\c\\d.txt")    =   "c:a\\b\\c"
      getFolderName("/home/admin")      =   "/home"
      getFolderName("/home/admin/a.txt/b.mp3")  =   "/home/admin/a.txt"
 

参数:

filePath -

返回:

getFileExtension

public static String getFileExtension(String filePath)

get suffix of file from path

      getFileExtension(null)               =   ""
      getFileExtension("")                 =   ""
      getFileExtension("   ")              =   "   "
      getFileExtension("a.mp3")            =   "mp3"
      getFileExtension("a.b.rmvb")         =   "rmvb"
      getFileExtension("abc")              =   ""
      getFileExtension("c:\\")              =   ""
      getFileExtension("c:\\a")             =   ""
      getFileExtension("c:\\a.b")           =   "b"
      getFileExtension("c:a.txt\\a")        =   ""
      getFileExtension("/home/admin")      =   ""
      getFileExtension("/home/admin/a.txt/b")  =   ""
      getFileExtension("/home/admin/a.txt/b.mp3")  =   "mp3"
 

参数:

filePath -

返回:

makeDirs

public static boolean makeDirs(String filePath)

Creates the directory named by the trailing filename of this file, including the complete directory path required to create this directory.

Attentions:
• makeDirs("C:\\Users\\Trinea") can only create users folder
• makeFolder("C:\\Users\\Trinea\\") can create Trinea folder

参数:

filePath -

返回:

true if the necessary directories have been created or the target directory already exists, false one of the directories can not be created.

• if getFolderName(String) return null, return false
• if target directory already exists, return true
• return java.io.File#makeFolder

makeFolders

public static boolean makeFolders(String filePath)

参数:

filePath -

返回:

另请参阅:

makeDirs(String)

isFileExist

public static boolean isFileExist(String filePath)

Indicates if this file represents a file on the underlying file system.

参数:

filePath -

返回:

isFolderExist

public static boolean isFolderExist(String directoryPath)

Indicates if this file represents a directory on the underlying file system.

参数:

directoryPath -

返回:

deleteFile

public static boolean deleteFile(String path)

delete file or directory

• if path is null or empty, return true
• if path not exist, return true
• if path exist, delete recursion. return true

参数:

path -

返回:

getFileSize

public static long getFileSize(String path)

get file size

• if path is null or empty, return -1
• if path exist and it is a file, return file size, else return -1

参数:

path -

返回:

returns the length of this file in bytes. returns -1 if the file does not exist.