Closeable, DataInput, AutoCloseable, ImageInputStream
public class FileImageInputStream extends ImageInputStreamImpl
ImageInputStream that gets its input from a File or RandomAccessFile. The file contents are assumed to be stable during the lifetime of the object.bitOffset, byteOrder, flushedPos, streamPos
| Constructor | Description |
|---|---|
FileImageInputStream |
Constructs a FileImageInputStream that will read from a given File. |
FileImageInputStream |
Constructs a FileImageInputStream that will read from a given RandomAccessFile. |
| Modifier and Type | Method | Description |
|---|---|---|
protected void |
finalize() |
Deprecated, for removal: This API element is subject to removal in a future version. Finalization has been deprecated for removal. |
long |
length() |
Returns the length of the underlying file, or -1 if it is unknown. |
int |
read() |
Reads a single byte from the stream and returns it as an int between 0 and 255. |
int |
read |
Reads up to len bytes from the stream, and stores them into b starting at index off. |
checkClosed, close, flush, flushBefore, getBitOffset, getByteOrder, getFlushedPosition, getStreamPosition, isCached, isCachedFile, isCachedMemory, mark, read, readBit, readBits, readBoolean, readByte, readBytes, readChar, readDouble, readFloat, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedInt, readUnsignedShort, readUTF, reset, seek, setBitOffset, setByteOrder, skipBytes, skipBytes
public FileImageInputStream(File f) throws FileNotFoundException, IOException
FileImageInputStream that will read from a given File. The file contents must not change between the time this object is constructed and the time of the last call to a read method.
f - a File to read from.IllegalArgumentException - if f is null.SecurityException - if a security manager exists and does not allow read access to the file.FileNotFoundException - if f is a directory or cannot be opened for reading for any other reason.IOException - if an I/O error occurs.public FileImageInputStream(RandomAccessFile raf)
FileImageInputStream that will read from a given RandomAccessFile. The file contents must not change between the time this object is constructed and the time of the last call to a read method.
raf - a RandomAccessFile to read from.IllegalArgumentException - if raf is null.public int read() throws IOException
ImageInputStreamImplint between 0 and 255. If EOF is reached, -1 is returned. Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting.
The bit offset within the stream must be reset to zero before the read occurs.
read in interface ImageInputStream
read in class ImageInputStreamImpl
-1 if EOF is reached.IOException - if the stream has been closed.public int read(byte[] b, int off, int len) throws IOException
ImageInputStreamImpllen bytes from the stream, and stores them into b starting at index off. If no bytes can be read because the end of the stream has been reached, -1 is returned. The bit offset within the stream must be reset to zero before the read occurs.
Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting.
read in interface ImageInputStream
read in class ImageInputStreamImpl
b - an array of bytes to be written to.off - the starting position within b to write to.len - the maximum number of bytes to read.-1 to indicate EOF.IOException - if an I/O error occurs.public long length()
-1 if it is unknown.length in interface ImageInputStream
length in class ImageInputStreamImpl
long, or -1.@Deprecated(since="9", forRemoval=true) protected void finalize() throws Throwable
Object.finalize() for background information and details about migration options.close method is called to close any open input source. This method should not be called from application code.finalize in class ImageInputStreamImpl
Throwable - if an error occurs during superclass finalization.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/imageio/stream/FileImageInputStream.html