public BufferedImage readTile(int imageIndex, int tileX, int tileY) throws IOException {
int w = getWidth(imageIndex);
int h = getHeight(imageIndex);
int tw = getTileWidth(imageIndex);
int th = getTileHeight(imageIndex);
int x = tw * tileX;
int y = th * tileY;
if (tileX < 0 || tileY < 0 || x >= w || y >= h) {
throw new IllegalArgumentException("Tile indices are out of bounds!");
}
if (x + tw > w) {
tw = w - x;
}
if (y + th > h) {
th = h - y;
}
ImageReadParam param = getDefaultReadParam();
Rectangle tileRect = new Rectangle(x, y, tw, th);
param.setSourceRegion(tileRect);
return read(imageIndex, param);
}
/**
* Test Writing capabilities.
*
* @throws FileNotFoundException
* @throws IOException
*/
@Test
public void write() throws IOException, FileNotFoundException {
if (!isGDALAvailable) {
return;
}
final File outputFile = TestData.temp(this, "writetest.tif", false);
outputFile.deleteOnExit();
final File inputFile = TestData.file(this, "utmByte.tif");
ImageReadParam rparam = new ImageReadParam();
rparam.setSourceRegion(new Rectangle(1, 1, 300, 500));
rparam.setSourceSubsampling(1, 2, 0, 0);
ImageReader reader = new GeoTiffImageReaderSpi().createReaderInstance();
reader.setInput(inputFile);
final IIOMetadata metadata = reader.getImageMetadata(0);
final ParameterBlockJAI pbjImageRead = new ParameterBlockJAI("ImageRead");
pbjImageRead.setParameter("Input", inputFile);
pbjImageRead.setParameter("reader", reader);
pbjImageRead.setParameter("readParam", rparam);
final ImageLayout l = new ImageLayout();
l.setTileGridXOffset(0).setTileGridYOffset(0).setTileHeight(256).setTileWidth(256);
RenderedOp image =
JAI.create("ImageRead", pbjImageRead, new RenderingHints(JAI.KEY_IMAGE_LAYOUT, l));
if (TestData.isInteractiveTest()) Viewer.visualizeAllInformation(image, "geotiff");
// ////////////////////////////////////////////////////////////////
// preparing to write
// ////////////////////////////////////////////////////////////////
final ParameterBlockJAI pbjImageWrite = new ParameterBlockJAI("ImageWrite");
ImageWriter writer = new GeoTiffImageWriterSpi().createWriterInstance();
pbjImageWrite.setParameter("Output", outputFile);
pbjImageWrite.setParameter("writer", writer);
pbjImageWrite.setParameter("ImageMetadata", metadata);
pbjImageWrite.setParameter("Transcode", false);
ImageWriteParam param = new ImageWriteParam(Locale.getDefault());
param.setSourceRegion(new Rectangle(10, 10, 100, 100));
param.setSourceSubsampling(2, 1, 0, 0);
pbjImageWrite.setParameter("writeParam", param);
pbjImageWrite.addSource(image);
final RenderedOp op = JAI.create("ImageWrite", pbjImageWrite);
final ImageWriter writer2 =
(ImageWriter) op.getProperty(ImageWriteDescriptor.PROPERTY_NAME_IMAGE_WRITER);
writer2.dispose();
// ////////////////////////////////////////////////////////////////
// preparing to read again
// ////////////////////////////////////////////////////////////////
final ParameterBlockJAI pbjImageReRead = new ParameterBlockJAI("ImageRead");
pbjImageReRead.setParameter("Input", outputFile);
pbjImageReRead.setParameter("Reader", new GeoTiffImageReaderSpi().createReaderInstance());
final RenderedOp image2 = JAI.create("ImageRead", pbjImageReRead);
if (TestData.isInteractiveTest()) Viewer.visualizeAllInformation(image2, "geotif2");
else Assert.assertNotNull(image2.getTiles());
}
/*
* 图片裁剪通用接口
*/
public static void cutImage(String src, String dest, int x, int y, int w, int h)
throws IOException {
Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
ImageReader reader = (ImageReader) iterator.next();
InputStream in = new FileInputStream(src);
ImageInputStream iis = ImageIO.createImageInputStream(in);
reader.setInput(iis, true);
ImageReadParam param = reader.getDefaultReadParam();
Rectangle rect = new Rectangle(x, y, w, h);
param.setSourceRegion(rect);
BufferedImage bi = reader.read(0, param);
ImageIO.write(bi, "jpg", new File(dest));
}
/*
* 图片裁剪二分之一
*/
public static void cutHalfImage(String src, String dest) throws IOException {
Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
ImageReader reader = (ImageReader) iterator.next();
InputStream in = new FileInputStream(src);
ImageInputStream iis = ImageIO.createImageInputStream(in);
reader.setInput(iis, true);
ImageReadParam param = reader.getDefaultReadParam();
int imageIndex = 0;
int width = reader.getWidth(imageIndex) / 2;
int height = reader.getHeight(imageIndex) / 2;
Rectangle rect = new Rectangle(width / 2, height / 2, width, height);
param.setSourceRegion(rect);
BufferedImage bi = reader.read(0, param);
ImageIO.write(bi, "jpg", new File(dest));
}
// This method needs to be synchronized as it updates the instance
// variable 'tileParam'.
public synchronized WritableRaster read(Rectangle rect) {
// XXX Does this need to consider the subsampling offsets or is
// that handled implicitly by the reader?
tileParam.setSourceRegion(
isSubsampling
? new Rectangle(
subsampleX * rect.x,
subsampleY * rect.y,
subsampleX * rect.width,
subsampleY * rect.height)
: rect);
try {
BufferedImage bi = reader.read(imageIndex, tileParam);
WritableRaster ras = bi.getRaster();
return ras.createWritableChild(0, 0, ras.getWidth(), ras.getHeight(), rect.x, rect.y, null);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Test
public void imageReadParam() throws IOException {
Iterator<ImageReader> itr = ImageIO.getImageReadersByFormatName("jpg");
ImageReader imageReader = itr.next();
ImageInputStream imageInputStream = ImageIO.createImageInputStream(new File(SRCIMG));
imageReader.setInput(imageInputStream, true);
ImageReadParam imageReadParam = imageReader.getDefaultReadParam();
int halfWidth = imageReader.getWidth(0) / 2;
int halfHeight = imageReader.getHeight(0) / 2;
Rectangle rectangle = new Rectangle(0, 0, halfWidth, halfHeight);
imageReadParam.setSourceRegion(rectangle);
BufferedImage bufferedImage = imageReader.read(0, imageReadParam);
System.out.println(bufferedImage.getWidth());
boolean result = ImageIO.write(bufferedImage, "png", new File(CONTEXT + "999.png"));
System.out.println(result);
}
/**
* 图片截取
*
* @param file
* @param newName
* @param path
* @param x
* @param y
* @param width
* @param height
* @return author:caobo date:Oct 14, 2009 12:38:05 PM
*/
public static File cutting(
File file, String newName, String path, int x, int y, int width, int height) {
ImageOutputStream out = null;
InputStream is = null;
ImageInputStream iis = null;
try {
String endName = file.getName();
endName = endName.substring(endName.lastIndexOf(".") + 1);
Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName(endName);
ImageReader reader = (ImageReader) readers.next();
is = new FileInputStream(file);
iis = ImageIO.createImageInputStream(is);
reader.setInput(iis, true);
ImageReadParam param = reader.getDefaultReadParam();
Rectangle rect = new Rectangle(x, y, width, height);
param.setSourceRegion(rect);
BufferedImage bi = reader.read(0, param);
File newFile = new File(path);
if (!newFile.exists()) newFile.mkdirs();
newFile = new File(path, newName);
out = ImageIO.createImageOutputStream(new FileOutputStream(newFile));
ImageIO.write(bi, endName, out);
file = newFile;
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
iis.close();
is.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
return file;
}
/**
* Load a specified a raster as a portion of the granule describe by this {@link
* GranuleDescriptor}.
*
* @param imageReadParameters the {@link ImageReadParam} to use for reading.
* @param index the index to use for the {@link ImageReader}.
* @param cropBBox the bbox to use for cropping.
* @param mosaicWorldToGrid the cropping grid to world transform.
* @param request the incoming request to satisfy.
* @param hints {@link Hints} to be used for creating this raster.
* @return a specified a raster as a portion of the granule describe by this {@link
* GranuleDescriptor}.
* @throws IOException in case an error occurs.
*/
public GranuleLoadingResult loadRaster(
final ImageReadParam imageReadParameters,
final int index,
final ReferencedEnvelope cropBBox,
final MathTransform2D mosaicWorldToGrid,
final RasterLayerRequest request,
final Hints hints)
throws IOException {
if (LOGGER.isLoggable(java.util.logging.Level.FINER)) {
final String name = Thread.currentThread().getName();
LOGGER.finer(
"Thread:" + name + " Loading raster data for granuleDescriptor " + this.toString());
}
ImageReadParam readParameters = null;
int imageIndex;
final ReferencedEnvelope bbox =
inclusionGeometry != null
? new ReferencedEnvelope(
granuleBBOX.intersection(inclusionGeometry.getEnvelopeInternal()),
granuleBBOX.getCoordinateReferenceSystem())
: granuleBBOX;
boolean doFiltering = false;
if (filterMe) {
doFiltering = Utils.areaIsDifferent(inclusionGeometry, baseGridToWorld, granuleBBOX);
}
// intersection of this tile bound with the current crop bbox
final ReferencedEnvelope intersection =
new ReferencedEnvelope(
bbox.intersection(cropBBox), cropBBox.getCoordinateReferenceSystem());
if (intersection.isEmpty()) {
if (LOGGER.isLoggable(java.util.logging.Level.FINE)) {
LOGGER.fine(
new StringBuilder("Got empty intersection for granule ")
.append(this.toString())
.append(" with request ")
.append(request.toString())
.append(" Resulting in no granule loaded: Empty result")
.toString());
}
return null;
}
ImageInputStream inStream = null;
ImageReader reader = null;
try {
//
// get info about the raster we have to read
//
// get a stream
assert cachedStreamSPI != null : "no cachedStreamSPI available!";
inStream =
cachedStreamSPI.createInputStreamInstance(
granuleUrl, ImageIO.getUseCache(), ImageIO.getCacheDirectory());
if (inStream == null) return null;
// get a reader and try to cache the relevant SPI
if (cachedReaderSPI == null) {
reader = ImageIOExt.getImageioReader(inStream);
if (reader != null) cachedReaderSPI = reader.getOriginatingProvider();
} else reader = cachedReaderSPI.createReaderInstance();
if (reader == null) {
if (LOGGER.isLoggable(java.util.logging.Level.WARNING)) {
LOGGER.warning(
new StringBuilder("Unable to get s reader for granuleDescriptor ")
.append(this.toString())
.append(" with request ")
.append(request.toString())
.append(" Resulting in no granule loaded: Empty result")
.toString());
}
return null;
}
// set input
reader.setInput(inStream);
// Checking for heterogeneous granules
if (request.isHeterogeneousGranules()) {
// create read parameters
readParameters = new ImageReadParam();
// override the overviews controller for the base layer
imageIndex =
ReadParamsController.setReadParams(
request.getRequestedResolution(),
request.getOverviewPolicy(),
request.getDecimationPolicy(),
readParameters,
request.rasterManager,
overviewsController);
} else {
imageIndex = index;
readParameters = imageReadParameters;
}
// get selected level and base level dimensions
final GranuleOverviewLevelDescriptor selectedlevel = getLevel(imageIndex, reader);
// now create the crop grid to world which can be used to decide
// which source area we need to crop in the selected level taking
// into account the scale factors imposed by the selection of this
// level together with the base level grid to world transformation
AffineTransform2D cropWorldToGrid =
new AffineTransform2D(selectedlevel.gridToWorldTransformCorner);
cropWorldToGrid = (AffineTransform2D) cropWorldToGrid.inverse();
// computing the crop source area which lives into the
// selected level raster space, NOTICE that at the end we need to
// take into account the fact that we might also decimate therefore
// we cannot just use the crop grid to world but we need to correct
// it.
final Rectangle sourceArea =
CRS.transform(cropWorldToGrid, intersection).toRectangle2D().getBounds();
// gutter
if (selectedlevel.baseToLevelTransform.isIdentity()) sourceArea.grow(2, 2);
XRectangle2D.intersect(
sourceArea,
selectedlevel.rasterDimensions,
sourceArea); // make sure roundings don't bother us
// is it empty??
if (sourceArea.isEmpty()) {
if (LOGGER.isLoggable(java.util.logging.Level.FINE)) {
LOGGER.fine(
"Got empty area for granuleDescriptor "
+ this.toString()
+ " with request "
+ request.toString()
+ " Resulting in no granule loaded: Empty result");
}
return null;
} else if (LOGGER.isLoggable(java.util.logging.Level.FINER)) {
LOGGER.finer(
"Loading level "
+ imageIndex
+ " with source region: "
+ sourceArea
+ " subsampling: "
+ readParameters.getSourceXSubsampling()
+ ","
+ readParameters.getSourceYSubsampling()
+ " for granule:"
+ granuleUrl);
}
// Setting subsampling
int newSubSamplingFactor = 0;
final String pluginName = cachedReaderSPI.getPluginClassName();
if (pluginName != null && pluginName.equals(ImageUtilities.DIRECT_KAKADU_PLUGIN)) {
final int ssx = readParameters.getSourceXSubsampling();
final int ssy = readParameters.getSourceYSubsampling();
newSubSamplingFactor = ImageIOUtilities.getSubSamplingFactor2(ssx, ssy);
if (newSubSamplingFactor != 0) {
if (newSubSamplingFactor > maxDecimationFactor && maxDecimationFactor != -1) {
newSubSamplingFactor = maxDecimationFactor;
}
readParameters.setSourceSubsampling(newSubSamplingFactor, newSubSamplingFactor, 0, 0);
}
}
// set the source region
readParameters.setSourceRegion(sourceArea);
final RenderedImage raster;
try {
// read
raster =
request
.getReadType()
.read(
readParameters,
imageIndex,
granuleUrl,
selectedlevel.rasterDimensions,
reader,
hints,
false);
} catch (Throwable e) {
if (LOGGER.isLoggable(java.util.logging.Level.FINE)) {
LOGGER.log(
java.util.logging.Level.FINE,
"Unable to load raster for granuleDescriptor "
+ this.toString()
+ " with request "
+ request.toString()
+ " Resulting in no granule loaded: Empty result",
e);
}
return null;
}
// use fixed source area
sourceArea.setRect(readParameters.getSourceRegion());
//
// setting new coefficients to define a new affineTransformation
// to be applied to the grid to world transformation
// -----------------------------------------------------------------------------------
//
// With respect to the original envelope, the obtained planarImage
// needs to be rescaled. The scaling factors are computed as the
// ratio between the cropped source region sizes and the read
// image sizes.
//
// place it in the mosaic using the coords created above;
double decimationScaleX = ((1.0 * sourceArea.width) / raster.getWidth());
double decimationScaleY = ((1.0 * sourceArea.height) / raster.getHeight());
final AffineTransform decimationScaleTranform =
XAffineTransform.getScaleInstance(decimationScaleX, decimationScaleY);
// keep into account translation to work into the selected level raster space
final AffineTransform afterDecimationTranslateTranform =
XAffineTransform.getTranslateInstance(sourceArea.x, sourceArea.y);
// now we need to go back to the base level raster space
final AffineTransform backToBaseLevelScaleTransform = selectedlevel.baseToLevelTransform;
// now create the overall transform
final AffineTransform finalRaster2Model = new AffineTransform(baseGridToWorld);
finalRaster2Model.concatenate(CoverageUtilities.CENTER_TO_CORNER);
final double x = finalRaster2Model.getTranslateX();
final double y = finalRaster2Model.getTranslateY();
if (!XAffineTransform.isIdentity(backToBaseLevelScaleTransform, Utils.AFFINE_IDENTITY_EPS))
finalRaster2Model.concatenate(backToBaseLevelScaleTransform);
if (!XAffineTransform.isIdentity(afterDecimationTranslateTranform, Utils.AFFINE_IDENTITY_EPS))
finalRaster2Model.concatenate(afterDecimationTranslateTranform);
if (!XAffineTransform.isIdentity(decimationScaleTranform, Utils.AFFINE_IDENTITY_EPS))
finalRaster2Model.concatenate(decimationScaleTranform);
// keep into account translation factors to place this tile
finalRaster2Model.preConcatenate((AffineTransform) mosaicWorldToGrid);
final Interpolation interpolation = request.getInterpolation();
// paranoiac check to avoid that JAI freaks out when computing its internal layouT on images
// that are too small
Rectangle2D finalLayout =
ImageUtilities.layoutHelper(
raster,
(float) finalRaster2Model.getScaleX(),
(float) finalRaster2Model.getScaleY(),
(float) finalRaster2Model.getTranslateX(),
(float) finalRaster2Model.getTranslateY(),
interpolation);
if (finalLayout.isEmpty()) {
if (LOGGER.isLoggable(java.util.logging.Level.INFO))
LOGGER.info(
"Unable to create a granuleDescriptor "
+ this.toString()
+ " due to jai scale bug creating a null source area");
return null;
}
ROI granuleLoadingShape = null;
if (granuleROIShape != null) {
final Point2D translate =
mosaicWorldToGrid.transform(new DirectPosition2D(x, y), (Point2D) null);
AffineTransform tx2 = new AffineTransform();
tx2.preConcatenate(
AffineTransform.getScaleInstance(
((AffineTransform) mosaicWorldToGrid).getScaleX(),
-((AffineTransform) mosaicWorldToGrid).getScaleY()));
tx2.preConcatenate(
AffineTransform.getScaleInstance(
((AffineTransform) baseGridToWorld).getScaleX(),
-((AffineTransform) baseGridToWorld).getScaleY()));
tx2.preConcatenate(
AffineTransform.getTranslateInstance(translate.getX(), translate.getY()));
granuleLoadingShape = (ROI) granuleROIShape.transform(tx2);
}
// apply the affine transform conserving indexed color model
final RenderingHints localHints =
new RenderingHints(
JAI.KEY_REPLACE_INDEX_COLOR_MODEL,
interpolation instanceof InterpolationNearest ? Boolean.FALSE : Boolean.TRUE);
if (XAffineTransform.isIdentity(finalRaster2Model, Utils.AFFINE_IDENTITY_EPS)) {
return new GranuleLoadingResult(raster, granuleLoadingShape, granuleUrl, doFiltering);
} else {
//
// In case we are asked to use certain tile dimensions we tile
// also at this stage in case the read type is Direct since
// buffered images comes up untiled and this can affect the
// performances of the subsequent affine operation.
//
final Dimension tileDimensions = request.getTileDimensions();
if (tileDimensions != null && request.getReadType().equals(ReadType.DIRECT_READ)) {
final ImageLayout layout = new ImageLayout();
layout.setTileHeight(tileDimensions.width).setTileWidth(tileDimensions.height);
localHints.add(new RenderingHints(JAI.KEY_IMAGE_LAYOUT, layout));
} else {
if (hints != null && hints.containsKey(JAI.KEY_IMAGE_LAYOUT)) {
final Object layout = hints.get(JAI.KEY_IMAGE_LAYOUT);
if (layout != null && layout instanceof ImageLayout) {
localHints.add(
new RenderingHints(JAI.KEY_IMAGE_LAYOUT, ((ImageLayout) layout).clone()));
}
}
}
if (hints != null && hints.containsKey(JAI.KEY_TILE_CACHE)) {
final Object cache = hints.get(JAI.KEY_TILE_CACHE);
if (cache != null && cache instanceof TileCache)
localHints.add(new RenderingHints(JAI.KEY_TILE_CACHE, (TileCache) cache));
}
if (hints != null && hints.containsKey(JAI.KEY_TILE_SCHEDULER)) {
final Object scheduler = hints.get(JAI.KEY_TILE_SCHEDULER);
if (scheduler != null && scheduler instanceof TileScheduler)
localHints.add(new RenderingHints(JAI.KEY_TILE_SCHEDULER, (TileScheduler) scheduler));
}
boolean addBorderExtender = true;
if (hints != null && hints.containsKey(JAI.KEY_BORDER_EXTENDER)) {
final Object extender = hints.get(JAI.KEY_BORDER_EXTENDER);
if (extender != null && extender instanceof BorderExtender) {
localHints.add(new RenderingHints(JAI.KEY_BORDER_EXTENDER, (BorderExtender) extender));
addBorderExtender = false;
}
}
// border extender
if (addBorderExtender) {
localHints.add(ImageUtilities.BORDER_EXTENDER_HINTS);
}
// boolean hasScaleX=!(Math.abs(finalRaster2Model.getScaleX()-1) <
// 1E-2/(raster.getWidth()+1-raster.getMinX()));
// boolean hasScaleY=!(Math.abs(finalRaster2Model.getScaleY()-1) <
// 1E-2/(raster.getHeight()+1-raster.getMinY()));
// boolean hasShearX=!(finalRaster2Model.getShearX() == 0.0);
// boolean hasShearY=!(finalRaster2Model.getShearY() == 0.0);
// boolean hasTranslateX=!(Math.abs(finalRaster2Model.getTranslateX()) <
// 0.01F);
// boolean hasTranslateY=!(Math.abs(finalRaster2Model.getTranslateY()) <
// 0.01F);
// boolean isTranslateXInt=!(Math.abs(finalRaster2Model.getTranslateX() -
// (int) finalRaster2Model.getTranslateX()) < 0.01F);
// boolean isTranslateYInt=!(Math.abs(finalRaster2Model.getTranslateY() -
// (int) finalRaster2Model.getTranslateY()) < 0.01F);
//
// boolean isIdentity = finalRaster2Model.isIdentity() &&
// !hasScaleX&&!hasScaleY &&!hasTranslateX&&!hasTranslateY;
// // TODO how can we check that the a skew is harmelss????
// if(isIdentity){
// // TODO check if we are missing anything like tiling or such that
// comes from hints
// return new GranuleLoadingResult(raster, granuleLoadingShape,
// granuleUrl, doFiltering);
// }
//
// // TOLERANCE ON PIXELS SIZE
//
// // Check and see if the affine transform is in fact doing
// // a Translate operation. That is a scale by 1 and no rotation.
// // In which case call translate. Note that only integer translate
// // is applicable. For non-integer translate we'll have to do the
// // affine.
// // If the hints contain an ImageLayout hint, we can't use
// // TranslateIntOpImage since it isn't capable of dealing with that.
// // Get ImageLayout from renderHints if any.
// ImageLayout layout = RIFUtil.getImageLayoutHint(localHints);
// if ( !hasScaleX &&
// !hasScaleY &&
// !hasShearX&&
// !hasShearY&&
// isTranslateXInt&&
// isTranslateYInt&&
// layout == null) {
// // It's a integer translate
// return new GranuleLoadingResult(new TranslateIntOpImage(raster,
// localHints,
// (int) finalRaster2Model.getShearX(),
// (int)
// finalRaster2Model.getShearY()),granuleLoadingShape, granuleUrl, doFiltering);
// }
ImageWorker iw = new ImageWorker(raster);
iw.setRenderingHints(localHints);
iw.affine(finalRaster2Model, interpolation, request.getBackgroundValues());
return new GranuleLoadingResult(
iw.getRenderedImage(), granuleLoadingShape, granuleUrl, doFiltering);
}
} catch (IllegalStateException e) {
if (LOGGER.isLoggable(java.util.logging.Level.WARNING)) {
LOGGER.log(
java.util.logging.Level.WARNING,
new StringBuilder("Unable to load raster for granuleDescriptor ")
.append(this.toString())
.append(" with request ")
.append(request.toString())
.append(" Resulting in no granule loaded: Empty result")
.toString(),
e);
}
return null;
} catch (org.opengis.referencing.operation.NoninvertibleTransformException e) {
if (LOGGER.isLoggable(java.util.logging.Level.WARNING)) {
LOGGER.log(
java.util.logging.Level.WARNING,
new StringBuilder("Unable to load raster for granuleDescriptor ")
.append(this.toString())
.append(" with request ")
.append(request.toString())
.append(" Resulting in no granule loaded: Empty result")
.toString(),
e);
}
return null;
} catch (TransformException e) {
if (LOGGER.isLoggable(java.util.logging.Level.WARNING)) {
LOGGER.log(
java.util.logging.Level.WARNING,
new StringBuilder("Unable to load raster for granuleDescriptor ")
.append(this.toString())
.append(" with request ")
.append(request.toString())
.append(" Resulting in no granule loaded: Empty result")
.toString(),
e);
}
return null;
} finally {
try {
if (request.getReadType() != ReadType.JAI_IMAGEREAD && inStream != null) {
inStream.close();
}
} finally {
if (request.getReadType() != ReadType.JAI_IMAGEREAD && reader != null) {
reader.dispose();
}
}
}
}
/**
* 根据指定坐标和长宽裁剪图片
*
* @param inputFilePath 源图片
* @param outputFilePath 产生新图片路径
* @param x x轴的开始坐标
* @param y y轴的开始坐标
* @param width 所裁剪的宽度
* @param height 所裁剪的高度
*/
public static void cut(
String inputFilePath, String outputFilePath, int x, int y, int width, int height) {
FileInputStream fileInputStream = null;
ImageInputStream imageInputStream = null;
try {
// 获得源文件
File inputFile = new File(inputFilePath);
if (!inputFile.exists()) {
logger.fatal(new FileNotFoundException());
return;
}
// 读取图片文件
fileInputStream = new FileInputStream(inputFilePath);
String format = FileUtil.getFileSuffix(inputFilePath);
// System.out.println(format);
// ImageReader声称能够解码指定格式
Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName(format);
ImageReader reader = it.next();
// 获取图片流
imageInputStream = ImageIO.createImageInputStream(fileInputStream);
// 输入源中的图像将只按顺序读取
reader.setInput(imageInputStream, true);
// 描述如何对流进行解码
ImageReadParam param = reader.getDefaultReadParam();
// 图片裁剪区域
Rectangle rect = new Rectangle(x, y, width, height);
// 提供一个 BufferedImage，将其用作解码像素数据的目标
param.setSourceRegion(rect);
// 使用所提供的 ImageReadParam 读取通过索引 imageIndex 指定的对象
BufferedImage bi = reader.read(0, param);
// 保存新图片
// File tempOutFile = new File(outputFilePath);
// if (!tempOutFile.exists()) {
// tempOutFile.mkdirs();
// }
ImageIO.write(bi, format, new File(outputFilePath));
} catch (Exception e) {
e.printStackTrace();
logger.fatal(e);
} finally {
try {
if (fileInputStream != null) {
fileInputStream.close();
}
if (imageInputStream != null) {
imageInputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
logger.fatal(e);
}
}
}
