我调用ImageIO.read(path);方法读取一张分辨率为宽:27919 高:28386的jpg图片,运行中抛出如下异常。第一眼以为是图片尺寸过大,超过了整型最大值。可是简单计算之后发现,整型最大值0x7fffffff(2147483647)比我这个图片的宽高的乘积大得多。
java.lang.IllegalArgumentException: Array size > Integer.MAX_VALUE!
at javax.imageio.ImageTypeSpecifier.createBufferedImage(ImageTypeSpecifier.java:1064)
at javax.imageio.ImageReader.getDestination(ImageReader.java:2879)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:1046)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:1014)
at javax.imageio.ImageIO.read(ImageIO.java:1422)
at javax.imageio.ImageIO.read(ImageIO.java:1282)
jdk相关的源代码如下,我根据这样的写法单独写了个简单的测试程序。
public SampleModel getSampleModel(int width, int height) {
if ((long)width*height > Integer.MAX_VALUE) {
throw new IllegalArgumentException
("width*height > Integer.MAX_VALUE!");
}
return sampleModel.createCompatibleSampleModel(width, height);
}
测试程序如下。结果也是smaller,真是搞不懂啊! 求大神指点啊!!!!
private static void test(int width,int height){
if ((long)width*height > Integer.MAX_VALUE) {
System.out.println("bigger!");
}
else{
System.out.println("smaller!");
}
}
public static void main(String[] args) {
int a = 27919;
int b = 28386;
test(a,b);
}