com.taobao.arthas.common

Class FileUtils

java.lang.Object

com.taobao.arthas.common.FileUtils

public class FileUtils
extends Object

Author:

hengyunabc 2020-05-03

See Also:

org.apache.commons.io.FileUtils

Constructor Summary

Constructors

Constructor and Description
FileUtils()

Method Summary

Modifier and Type	Method and Description
static File	getTempDirectory()
static FileOutputStream	openOutputStream(File file, boolean append) Opens a FileOutputStream for the specified file, checking and creating the parent directory if it does not exist.
static byte[]	readFileToByteArray(File file) Reads the contents of a file into a byte array.
static void	writeByteArrayToFile(File file, byte[] data) Writes a byte array to a file creating the file if it does not exist.
static void	writeByteArrayToFile(File file, byte[] data, boolean append) Writes a byte array to a file creating the file if it does not exist.
static void	writeByteArrayToFile(File file, byte[] data, int off, int len) Writes len bytes from the specified byte array starting at offset off to a file, creating the file if it does not exist.
static void	writeByteArrayToFile(File file, byte[] data, int off, int len, boolean append) Writes len bytes from the specified byte array starting at offset off to a file, creating the file if it does not exist.

Methods inherited from class java.lang.Object

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

Constructor Detail

FileUtils

public FileUtils()

Method Detail

getTempDirectory

public static File getTempDirectory()

writeByteArrayToFile

public static void writeByteArrayToFile(File file,
                                        byte[] data)
                                 throws IOException

Writes a byte array to a file creating the file if it does not exist.

NOTE: As from v1.3, the parent directories of the file will be created if they do not exist.

Parameters:

file - the file to write to

data - the content to write to the file

Throws:

IOException - in case of an I/O error

Since:

1.1

writeByteArrayToFile

public static void writeByteArrayToFile(File file,
                                        byte[] data,
                                        boolean append)
                                 throws IOException

Writes a byte array to a file creating the file if it does not exist.

Parameters:

file - the file to write to

data - the content to write to the file

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

Throws:

IOException - in case of an I/O error

Since:

2.1

writeByteArrayToFile

public static void writeByteArrayToFile(File file,
                                        byte[] data,
                                        int off,
                                        int len)
                                 throws IOException

Writes len bytes from the specified byte array starting at offset off to a file, creating the file if it does not exist.

Parameters:

file - the file to write to

data - the content to write to the file

off - the start offset in the data

len - the number of bytes to write

Throws:

IOException - in case of an I/O error

Since:

2.5

writeByteArrayToFile

public static void writeByteArrayToFile(File file,
                                        byte[] data,
                                        int off,
                                        int len,
                                        boolean append)
                                 throws IOException

Writes len bytes from the specified byte array starting at offset off to a file, creating the file if it does not exist.

Parameters:

file - the file to write to

data - the content to write to the file

off - the start offset in the data

len - the number of bytes to write

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

Throws:

IOException - in case of an I/O error

Since:

2.5

openOutputStream

public static FileOutputStream openOutputStream(File file,
                                                boolean append)
                                         throws IOException

Opens a FileOutputStream for the specified file, checking and creating the parent directory if it does not exist.

At the end of the method either the stream will be successfully opened, or an exception will have been thrown.

The parent directory will be created if it does not exist. The file will be created if it does not exist. An exception is thrown if the file object exists but is a directory. An exception is thrown if the file exists but cannot be written to. An exception is thrown if the parent directory cannot be created.

Parameters:

file - the file to open for output, must not be null

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

Returns:

a new FileOutputStream for the specified file

Throws:

IOException - if the file object is a directory

IOException - if the file cannot be written to

IOException - if a parent directory needs creating but that fails

Since:

2.1

readFileToByteArray

public static byte[] readFileToByteArray(File file)
                                  throws IOException

Reads the contents of a file into a byte array. The file is always closed.

Parameters:

file - the file to read, must not be null

Returns:

the file contents, never null

Throws:

IOException - in case of an I/O error

Since:

1.1