A file output stream is an output stream for writing data to a File or to a FileDescriptor . Whether or not a file is available or may be created depends upon the underlying platform. Some platforms, in particular, allow a file to be opened for writing by only one FileOutputStream (or other file-writing object) at a time. In such situations the constructors in this class will fail if the file involved is already open. FileOutputStream is meant for writing streams of raw bytes such as image data. For writing streams of characters, consider using FileWriter .
Creates a file output stream to write to the specified file descriptor, which represents an existing connection to an actual file in the file system.
Creates a file output stream to write to the file with the specified name. Creates a file output stream to write to the file with the specified name.| Modifier and Type | Method and Description |
|---|---|
| void | close () |
Cleans up the connection to the file, and ensures that the close method of this file output stream is called when there are no more references to this stream.
Returns the unique FileChannel object associated with this file output stream. Returns the file descriptor associated with this stream. Writes b.length bytes from the specified byte array to this file output stream. Writes len bytes from the specified byte array starting at offset off to this file output stream. Writes the specified byte to this file output stream.public FileOutputStream(String name) throws FileNotFoundException
Creates a file output stream to write to the file with the specified name. A new FileDescriptor object is created to represent this file connection. First, if there is a security manager, its checkWrite method is called with name as its argument. If the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason then a FileNotFoundException is thrown.
public FileOutputStream(String name, boolean append) throws FileNotFoundException
Creates a file output stream to write to the file with the specified name. If the second argument is true , then bytes will be written to the end of the file rather than the beginning. A new FileDescriptor object is created to represent this file connection. First, if there is a security manager, its checkWrite method is called with name as its argument. If the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason then a FileNotFoundException is thrown.
public FileOutputStream(File file) throws FileNotFoundException
Creates a file output stream to write to the file represented by the specified File object. A new FileDescriptor object is created to represent this file connection. First, if there is a security manager, its checkWrite method is called with the path represented by the file argument as its argument. If the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason then a FileNotFoundException is thrown.
public FileOutputStream(File file, boolean append) throws FileNotFoundException
Creates a file output stream to write to the file represented by the specified File object. If the second argument is true , then bytes will be written to the end of the file rather than the beginning. A new FileDescriptor object is created to represent this file connection. First, if there is a security manager, its checkWrite method is called with the path represented by the file argument as its argument. If the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason then a FileNotFoundException is thrown.
public FileOutputStream(FileDescriptor fdObj)
Creates a file output stream to write to the specified file descriptor, which represents an existing connection to an actual file in the file system. First, if there is a security manager, its checkWrite method is called with the file descriptor fdObj argument as its argument. If fdObj is null then a NullPointerException is thrown. This constructor does not throw an exception if fdObj is invalid . However, if the methods are invoked on the resulting stream to attempt I/O on the stream, an IOException is thrown.