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在commons-io包中org.apache.commons.io.IOUtils類的toByteArray(InputStream input)已經(jīng)有實(shí)現(xiàn)了,我們可以參考下思路,完成我們的方法,我們可以用類似下面的代碼實(shí)現(xiàn)inputStream轉(zhuǎn)化為byte[]數(shù)組

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中摘錄出與toByteArray相關(guān)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;}