Question

java中UDP文件传输怎么实现？

Answer 1

java UDP连接,如果要发送文件的话,你只能自己定义一系列的协议
因为TCP UDP 双方发送都是二进制数据
那么这个实现非常复杂
得不停的发送数据,写数据,建议使用http协议

Answer 2

//Send
DatagramSocket ds = new DatagramSocket(5555, InetAddress.getByName("10.0.0.1"));
InputStream in = new FileInputStream(new File("a.txt"));
byte[] b = new byte[10240];
int c = in.read(b);
in.close();
DatagramPacket dp = new DatagramPacket(b, c);
ds.send(dp);

//Receive
DatagramSocket ds2 = new DatagramSocket(5555);
DatagramPacket dp2 = new DatagramPacket(b,b.length);
ds2.receive(dp2);
OutputStream out=new FileOutputStream(new File("out.txt"));
out.write(dp2.getData());
out.close();