我正在尝试编写一些通过UDP发送单个int的代码.我到目前为止的代码：
发件人：
int num = 2;
DatagramSocket socket = new DatagramSocket();
ByteArrayOutputStream bout = new ByteArrayOutputStream();
PrintStream pout = new PrintStream( bout );
pout.print(num);
byte[] barray = bout.toByteArray();
DatagramPacket packet = new DatagramPacket( barray,barray.length );
InetAddress remote_addr = InetAddress.getByName("localhost");
packet.setAddress( remote_addr );
packet.setPort(1989);
socket.send( packet );
接收器：
DatagramSocket socket = new DatagramSocket(1989);
DatagramPacket packet = new DatagramPacket(new byte[256],256);
socket.receive(packet);
ByteArrayInputStream bin = new ByteArrayInputStream(packet.getData());
for (int i=0; i< packet.getLength(); i++)
{
int data = bin.read();
if(data == -1)
break;
else
System.out.print((int) data);
问题是接收器正在向屏幕打印“50”,这显然是不对的.我认为问题可能是我以某种方式将其作为字符串或其他东西发送而且它没有正确读取它.有帮助吗？
解决方法
使用数据流,如：
import java.io.*;
public class Main {
public static void main(String[] args) throws Exception {
final ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
final DataOutputStream dataOut = new DataOutputStream(byteOut);
dataOut.writeInt(1);
dataOut.writeDouble(1.2);
dataOut.writeLong(4l);
dataOut.close(); // or dataOut.flush()
final byte[] bytes = byteOut.toByteArray();
final ByteArrayInputStream byteIn = new ByteArrayInputStream(bytes);
final DataInputStream dataIn = new DataInputStream(byteIn);
final int integ = dataIn.readInt();
final double doub = dataIn.readDouble();
final long lon = dataIn.readLong();
System.out.println(integ);
System.out.println(doub);
System.out.println(lon);
}
}
