javax.imageio.ImageIO.read(file) 内存溢出
2013-08-21 07:14
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近期使用ImageIO对象生成图片的缩略图功能,无论图片大小,总是会报出以下异常信息:
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferByte.<init>(Unknown Source)
at java.awt.image.ComponentSampleModel.createDataBuffer(Unknown Source)
at java.awt.image.Raster.createWritableRaster(Unknown Source)
at javax.imageio.ImageTypeSpecifier.createBufferedImage(Unknown Source)
at javax.imageio.ImageReader.getDestination(Unknown Source)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(Unknown Sou
rce)
经查找原因,得出以下结论:
ImageIO.read(File file)使用来自boolean getUseCache() 和 File getCacheDirectory()的当前缓存设置控制所创建的 ImageInputStream 中的缓存。其中getUseCache()默认设定是true,getCacheDirectory()返回的是setCacheDirectory(File cacheDirectory)所设定的目标,如果用户没有明显设定,那么getCacheDirectory()返回的将是null。
所以,你出现问题的原因可能是没有设定getUseCache(),那么取true;没有设定setCacheDirectory()那么返回null,,也就是你要图片存在用户缓存区但没给它设定,所以出现了内存不足的情况。
可使用ImageIO.setCacheDirectory(File cacheDirectory)给它设定一个缓存路径或者ImageIO.setUseCache(false)用系统缓存
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferByte.<init>(Unknown Source)
at java.awt.image.ComponentSampleModel.createDataBuffer(Unknown Source)
at java.awt.image.Raster.createWritableRaster(Unknown Source)
at javax.imageio.ImageTypeSpecifier.createBufferedImage(Unknown Source)
at javax.imageio.ImageReader.getDestination(Unknown Source)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(Unknown Sou
rce)
经查找原因,得出以下结论:
ImageIO.read(File file)使用来自boolean getUseCache() 和 File getCacheDirectory()的当前缓存设置控制所创建的 ImageInputStream 中的缓存。其中getUseCache()默认设定是true,getCacheDirectory()返回的是setCacheDirectory(File cacheDirectory)所设定的目标,如果用户没有明显设定,那么getCacheDirectory()返回的将是null。
所以,你出现问题的原因可能是没有设定getUseCache(),那么取true;没有设定setCacheDirectory()那么返回null,,也就是你要图片存在用户缓存区但没给它设定,所以出现了内存不足的情况。
可使用ImageIO.setCacheDirectory(File cacheDirectory)给它设定一个缓存路径或者ImageIO.setUseCache(false)用系统缓存
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