JDK1.7 ImageIO的一个梗

上个星期我的leader就要我看 这个东西了，由于一个星期都在做项目上的东西，没时间看，今天终于把那个事情完结了。。

来脑补一下这个事情：

他们项目组的JDK原来是JDK1.6，现在要用JDK1.7，然后呢，图像处理这一块有点问题。

JDK1.7将encoder,decoder类删除掉了，所以呢代码就有问题了，就要我帮助他们改一改。

今天终于好了！

言归正传，了解下JDK1.7和JDK1.6的差别吧：

encoder --> 写 write

decoder --> 读 read

static BufferedImage	read(File input) Returns a BufferedImage as the result of decoding a supplied File with an ImageReader chosen automatically from among those currently registered.
static BufferedImage	read(ImageInputStream stream) Returns a BufferedImage as the result of decoding a supplied ImageInputStream with an ImageReader chosen automatically from among those currently registered.
static BufferedImage	read(InputStream input) Returns a BufferedImage as the result of decoding a supplied InputStream with an ImageReader chosen automatically from among those currently registered.
static BufferedImage	read(URL input) Returns a BufferedImage as the result of decoding a supplied URL with an ImageReader chosen automatically from among those currently registered.

read

public static BufferedImage read(ImageInputStream stream)
throws IOException

Returns a

BufferedImage

as the result of decoding a supplied

ImageInputStream

with an

ImageReader

chosen automatically from among those currently registered. If no registered

ImageReader

claims to be able to read the stream,

null

is returned.
Unlike most other methods in this class, this method does close the provided

ImageInputStream

after the read operation has completed, unless

null

is returned, in which case this method does not close the stream.

Parameters:

stream

- an

ImageInputStream

to read from. Returns:a

BufferedImage

containing the decoded contents of the input, or

null

. Throws:

IllegalArgumentException

- if

stream

is

null

.

IOException

- if an error occurs during reading.

static boolean	write(RenderedImage im, String formatName, File output) Writes an image using an arbitrary ImageWriter that supports the given format to a File .
static boolean	write(RenderedImage im, String formatName, ImageOutputStream output) Writes an image using the an arbitrary ImageWriter that supports the given format to an ImageOutputStream .
static boolean	write(RenderedImage im, String formatName, OutputStream output) Writes an image using an arbitrary ImageWriter that supports the given format to an OutputStream .

public static boolean write(RenderedImage im,
String formatName,
File output)
throws IOException

Writes an image using an arbitrary

ImageWriter

that supports the given format to a

File

. If there is already a

File

present, its contents are discarded.
Parameters:

im

- a

RenderedImage

to be written.

formatName

- a

String

containg the informal name of the format.

output

- a

File

to be written to. Returns:

false

if no appropriate writer is found. Throws:

IllegalArgumentException

- if any parameter is

null

.

IOException

- if an error occurs during writing.