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在commons-io包中org.apache.commons.io.IOUtils类的toByteArray(InputStream input)已经有实现了,我们可以参考下思路,完成我们的方法,我们可以用类似下面的代码实现inputStream转化为byte[]数组
public static byte[] toByteArray(InputStream input) throws IOException { ByteArrayOutputStream output = new ByteArrayOutputStream(); byte[] buffer = new byte[4096]; int n = 0; while (-1 != (n = input.read(buffer))) { output.write(buffer, 0, n); } return output.toByteArray();}
下面是IOUtils中摘录出与toByteArray相关的方法
org.apache.commons.io.IOUtils.toByteArray方法如下:public static byte[] toByteArray(InputStream input) throws IOException{ ByteArrayOutputStream output = new ByteArrayOutputStream(); copy(input, output); return output.toByteArray();}public static int copy(InputStream input, OutputStream output) throws IOException{ long count = copyLarge(input, output); if (count > 2147483647L) { return -1; } return (int)count;}public static long copyLarge(InputStream input, OutputStream output) throws IOException{ byte[] buffer = new byte[4096]; long count = 0L; int n = 0; while (-1 != (n = input.read(buffer))) { output.write(buffer, 0, n); count += n; } return count;}