整数列表到字节数组-ListofIntegersintobytearray

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There is byteValue() method available in Number class. Number is extended by Integer, Double, Float etc.

Number类中有byteValue（）方法。数字由Integer，Double，Float等扩展。

List list = getNumbers();

Iterator iterator = list.iterator();

while(iterator.hasNext())
{
   Integer i = iterator.next()
   byteArray[index] = i.byteValue();
}

You can also use java.nio.MappedByteBuffer class for block copy. see http://docs.oracle.com/javase/7/docs/api/java/nio/MappedByteBuffer.html.

您还可以使用java.nio.MappedByteBuffer类进行块复制。请参阅http://docs.oracle.com/javase/7/docs/api/java/nio/MappedByteBuffer.html。

MappedByteBuffer is equivalent to Buffer.BlockCopy() in .NET

MappedByteBuffer等同于.NET中的Buffer.BlockCopy（）

0  

// example input list
List list = new LinkedList();
list.add(1);
list.add(0);
list.add(1);
list.add(0);
list.add(1);
list.add(1);

// write to byte array
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(baos);
for (int element : list) {
    out.writeUTF(Integer.toString(element));
}
byte[] bytes = baos.toByteArray();

// read from byte array
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
DataInputStream in = new DataInputStream(bais);
while (in.available() > 0) {
    String element = in.readUTF();
    System.out.println(element);
}