[英]Converting from object to byte array and back in java
我有兩個類:TcpPacket和IpPacket。 tcpPacket應該存儲在ip數據包的數據字段中。 如何可靠地將tcpPacket對象轉換為字節數組,以便可以將其存儲在IpPacket的數據字段中? 並且在另一側接收到數據包后,如何可靠地將其轉換回數據包對象?
public static final class TcpPacket {
int source;
int destination;
public Packet( int source, int destination ) {
this.source = source;
this.destination = destination;
}
public String toString() {
return "Source: " + source + ", Dest: " + destination;
}
}
public static final class IpPacket {
byte[] data;
IpPacket( byte[] data ){
this.data = data;
}
}
TcpPacket tcpPacket = new TcpPacket( <someint>, <someint> );
// the following doesn't work because tcppacket is not a byte array.
IpPacket ipPacket = new IpPacket( tcpPacket );
通常如何做?
謝謝Maricruzz
這應該可行,只要從序列化/反序列化函數接收到對象,然后將其轉換為您的類即可。
public static byte[] objToByte(TcpPacket tcpPacket) throws IOException {
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
ObjectOutputStream objStream = new ObjectOutputStream(byteStream);
objStream.writeObject(tcpPacket);
return byteStream.toByteArray();
}
public static Object byteToObj(byte[] bytes) throws IOException, ClassNotFoundException {
ByteArrayInputStream byteStream = new ByteArrayInputStream(bytes);
ObjectInputStream objStream = new ObjectInputStream(byteStream);
return objStream.readObject();
}
我想為您提供序列化課程的手動方法。
public static final class TcpPacket {
public byte [] toByteArray() {
ByteBuffer b = ByteBuffer.allocate(4 * 2);
return b.putInt(source).putInt(destination).array();
}
public static TcpPacket fromByteArray(byte [] bytes) {
if (bytes.length < 8) throw new IllegalArgumentException("not enough bytes");
ByteBuffer b = ByteBuffer.wrap(bytes);
int source = b.getInt();
int destination = b.getInt();
return new TcpPacket(source, destination);
}
}
添加toByteArray
和靜態fromByteArray
方法將為您提供所需的東西,並具有以下好處:
如果您需要序列化更復雜的數據結構,我強烈建議您選擇一個建立良好的序列化庫,例如google協議緩沖區 (我個人選擇的武器)或不遭受安全噩夢困擾的眾多其他庫之一。 Java序列化。
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