java InputStream如何转化为byte[]数组实例教程，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相关的方法实例

org.apache.commons.io.IOUtils.toByteArray



方法实例源码如下:

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;

}