java - 如何将 File 对象转换为 Netty ByteBuffer

Question

有没有办法从 java File 对象中获取 netty ByteBuf？我正在尝试使用自定义 Snappy验证校验和的类。下面是我的代码，我想在 bytebuf 变量中获取 File 对象。

import io.netty.buffer.ByteBuf;

File file = new File("boot.zip");
ByteBuf byteBuf = Unpooled.buffer(128);
byteBuf.writeBytes(new FileInputStream(file));
int expectedChecksum = Snappy.calculateChecksum(byteBuf);
logger.info("checksum = "+expectedChecksum);

boolean checksumValid = true;
try {       
    CustomSnappy.validateChecksum(expectedChecksum, byteBuf);
} catch(DecompressionException e) {
    checksumValid = false;
    e.printStackTrace();
    logger.error("DecompressionException in checksum calculation " + e);            
} catch(Exception e) {
    checksumValid = false;
    e.printStackTrace();
    logger.error("Exception in checksum calculation " + e);
}

我使用了 Unpooled.buffer(128) 但它给了我 No signature of method :io.netty.buffer.UnpooledHeapByteBuf.writeBytes() is applicable for argument types: (java.io.FileInputStream) values: [ java.io.FileInputStream@28b6520b]

Answer 1

您可以从 FileChannel 创建一个 MappedByteBuf 并通过 Unpooled.wrappedBuffer(..) 将其包装在 ByteBuffer 中。