Example of arraycopy() usage

Someone asked for a more complete example of copying byte arrays in ColdFusion MX using Java's System.arraycopy() method. (The subject originally came up on Christian Cantrell's weblog.)

Here's a slightly more detailed version of what I posted in comments over there.

 <cfscript>
  <!--- b1 and b2 are two Java byte arrays that I want to concatenate --->
  byteClass = createObject("java", "java.lang.Byte").TYPE;
  refArray = createObject("java","java.lang.reflect.Array");
  byteLen = b1.getLength() + b2.getLength();

  <!--- bdest is the byte array where I want to put the result --->
  bdest = refArray.newInstance(byteClass, javacast("int", byteLen));
  sys = createObject("java","java.lang.System");
  sys.arraycopy(b1, 0, bdest, 0, b1.getLength());
  sys.arraycopy(b2.getBytes(), 0, bdest, b1.getLength(), b2.getLength());
 </cfscript>