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	@Test
	public void test2() {
		ByteBuf b = getBuf();
		System.out.println("原始数据:" + b);
		//原始数据:UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 4, widx: 12, cap: 1024)


		b = getBuf();
		System.out.println("copy:" + b.copy());
		//copy:UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 0, widx: 8, cap: 8)


		b = getBuf();
		System.out.println("duplicate：" + b.duplicate());
		//duplicate：UnpooledDuplicatedByteBuf(ridx: 4, widx: 12, cap: 1024, unwrapped: UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 4, widx: 12, cap: 1024))


		b = getBuf();
		System.out.println("slice;" + b.slice());
		//slice;UnpooledSlicedByteBuf(ridx: 0, widx: 8, cap: 8/8, unwrapped: UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 4, widx: 12, cap: 1024))

	}

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	//返回一个总长度为1024，数据长度为12，读索引为4，写索引为12的bytebuf
	public static ByteBuf getBuf() {
		ByteBuf b = Unpooled.buffer(1024);
		b.writeInt(1);
		b.writeInt(2);
		b.writeInt(3);
		b.readInt();
		return b;
	}