Java UDP - 数据包发送问题

Question

每次我尝试将 UDP 数据包发送到某个地址时，都会出现以下异常:

java.lang.ArrayIndexOutOfBoundsException
    at java.net.PlainDatagramSocketImpl.send(Native Method)
    at java.net.DatagramSocket.send(DatagramSocket.java:625)
    at services.servicetypes.network.host.Server_UDP_Thread_Monitor.send(Server_UDP_Thread_Monitor.java:84)

直接指向套接字发送函数 - this.socket.send(packet);

在数据报包上放置断点后，我得到以下信息:

packet  DatagramPacket  java.net.DatagramPacket@52c4c57 
byte[]  #1248(length=16)    
offset  int 0   
length  int 16  
bufLength   int 16  
address Inet4Address    /192.168.0.101  
Static          
Inherited   
port    int 3889

我不清楚为什么会发生这种情况，如果有人能阐明这个问题，那就太好了。我最初的想法是数据报包元素之一可能是空的。

(基本来源)

ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(byteOut);

// Game type
out.writeInt(1);

// Client
out.writeInt(gamerToSend.getClientID());

// Position
out.writeFloat(gamerToSend.getX());
out.writeFloat(gamerToSend.getY());


DatagramPacket packet = new DatagramPacket
(
  byteOut.toByteArray(),
  byteOut.size(),
  gamerToSend.getInetAddress(),
  3887
);

this.socket.send(packet);

byteOut.close();
out.close();

INetAddress 信息:(Ip 正确显示目标计算机)

address Inet4Address    /192.168.0.101  /192.168.0.101  
Static      
INADDRSZ    int 4   4   
serialVersionUID    long    3286316764910316507 3286316764910316507 
loopback    int 2130706433  2130706433  
IPv4    int 1   1   
IPv6    int 2   2   
preferIPv6Address   boolean false   false   
nameService InetAddress$1   java.net.InetAddress$1@5bf0cf51 java.net.InetAddress$1@5bf0cf51 
serialVersionUID    long    3286316764910316507 3286316764910316507 
addressCache    InetAddress$Cache   java.net.InetAddress$Cache@1ebafdff java.net.InetAddress$Cache@1ebafdff 
negativeCache   InetAddress$Cache   java.net.InetAddress$Cache@679801c  java.net.InetAddress$Cache@679801c  
addressCacheInit    boolean true    true    
unknown_array   InetAddress[]   #1266(length=1) #1266(length=1) 
impl    Inet6AddressImpl    java.net.Inet6AddressImpl@12c9b196  java.net.Inet6AddressImpl@12c9b196  
lookupTable HashMap "size = 0"  "size = 0"  
$assertionsDisabled boolean true    true    
Inherited               
hostName                
address int -1062731675 -1062731675 
family  int 2   2   
canonicalHostName               
caport  int 3889    3889    

服务器源 http://pastebin.com/JCdjhFQM

Answer 1

我怀疑这与使用缓冲的DataOutputStream，然后传递底层byte[]有关。

在创建数据包之前尝试 out.flush()。