Java $B%W%i%C%H%U%)!<%`(J 1.2 API $B;EMM(J: $B%/%i%9(J MulticastSocket

$B35MW(J

$B%Q%C%1!<%8(J

$B%/%i%9(J

$B;HMQ(J

$B3,AX%D%j!<(J

$B?d>)$5$l$J$$(J

$B%$%s%G%C%/%9(J

$B%X%k%W(J

Java $B%W%i%C%H%U%)!<%`(J 1.2

$BA0$N%/%i%9(J $B

$B%U%l!<%`$"$j(J $B%U%l!<%`$J$7(J

$B35MW(J: $BFbIt%/%i%9(J | $B%U%#!<%k%I(J | $B%3%s%9%H%i%/%?(J | $B%a%=%C%I(J

$B>\:Y(J: $B%U%#!<%k%I(J | $B%3%s%9%H%i%/%?(J | $B%a%=%C%I(J

java.net
$B%/%i%9(J MulticastSocket

java.lang.Object
  |
  +--java.net.DatagramSocket
        |
        +--java.net.MulticastSocket

public class MulticastSocket
extends DatagramSocket

$B%^%k%A%-%c%9%H%G!<%?%0%i%`%=%1%C%H%/%i%9$O!"(JIP $B%^%k%A%-%c%9%H%Q%1%C%H$rAwe$NB>$N%^%k%A%-%c%9%H%[%9%H$N!V%0%k!<%W!W$K;22C$9$kDI2C5!G=$r;}$D(J (UDP) DatagramSocket $B$G$9!#(J

$B%^%k%A%-%c%9%H%0%k!<%W$r;XDj$9$k$K$O!"%/%i%9(J D $B$N(J IP $B%"%I%l%9(J (224.0.0.1 $B!A(J 239.255.255.255 $B$NHO0O(J) $B$HI8=`E*$J(J UDP $B%]!<%HHV9f$r;HMQ$7$^$9!#%^%k%A%-%c%9%H%0%k!<%W$K;22C$9$k$K$O!"$^$:L\E*$N%]!<%H$r;HMQ$7$F(J MulticastSocket $B$r:n@.$7!"joinGroup(InetAddress groupAddr) $B%a%=%C%I$r8F$S=P$7$^$9!# // join a Multicast group and send the group salutations ... byte[] msg = {'H', 'e', 'l', 'l', 'o'}; InetAddress group = InetAddress.getByName("228.5.6.7"); MulticastSocket s = new MulticastSocket(6789); s.joinGroup(group); DatagramPacket hi = new DatagramPacket(msg, msg.length, group, 6789); s.send(hi); // get their responses! byte[] buf = new byte[1000]; DatagramPacket recv = new DatagramPacket(buf, buf.length); s.receive(recv); ... // OK, I'm done talking - leave the group... s.leaveGroup(group); $B%^%k%A%-%c%9%H%0%k!<%W$K%a%C%;!<%8$rAw?.$9$k$H!"$=$N%[%9%H$H%]!<%H$N(J$B$9$Y$F$N(J$B;22C\:Y$O8e=R(J)$B!#%^%k%A%-%c%9%H%0%k!<%W$K%a%C%;!<%8$rAw?.$9$k$?$a$K$O!"%=%1%C%H$,$=$N%^%k%A%-%c%9%H%0%k!<%W$N%a%s%P$G$"$kI,MW$O$"$j$^$;$s!#(J

$B%=%1%C%H$,%^%k%A%-%c%9%H%0%k!<%W$^$?$O%]!<%H$K;22C$9$k$H!"$[$+$N%[%9%H$+$i$=$N%0%k!<%W$^$?$O%]!<%H$KAw?.$5$l$?%G!<%?%0%i%`$r$N%a%s%P$b$9$Y$FF1$8%G!<%?%0%i%`$r $B8=:_$N$H$3$m!"%"%W%l%C%H$G$O%^%k%A%-%c%9%H%=%1%C%H$r;HMQ$9$k$3$H$O$G$-$^$;$s!#(J

$BF3F~$5$l$?%P!<%8%g%s(J:: JDK1.1

$B%3%s%9%H%i%/%?$N35MW(J
`MulticastSocket()` $B%^%k%A%-%c%9%H%=%1%C%H$r:n@.$7$^$9!#(J
`MulticastSocket(int port)` $BFCDj$N%]!<%H$K%P%$%s%I$5$l$?%^%k%A%-%c%9%H%=%1%C%H$r:n@.$7$^$9!#(J

$B%a%=%C%I$N35MW(J
`InetAddress`	`getInterface()` $B%^%k%A%-%c%9%H%Q%1%C%H$K;HMQ$9$k%M%C%H%o!<%/%$%s%?%U%'!<%9$N%"%I%l%9$r
`int`	`getTimeToLive()` $B$3$N%=%1%C%H$+$iAw?.$5$l$k%^%k%A%-%c%9%H%Q%1%C%H$N%G%U%)%k%H$NM-8z4\|4V$r
`byte`	`getTTL()` $B?d>)$5$l$^$;$s!#(J $BBe$o$j$K(J getTimeToLive $B%a%=%C%I$r;HMQ$7$F$/$@$5$$!#$3$N%a%=%C%I$G$O!"M-8z4\|4V$r(J 0 $B!A(J 255 (0 $B$O4^$^$J$$(J) $B$NHO0O$G
`void`	`joinGroup(InetAddress mcastaddr)` $B%^%k%A%-%c%9%H%0%k!<%W$K;22C$7$^$9!#(J
`void`	`leaveGroup(InetAddress mcastaddr)` $B%^%k%A%-%c%9%H%0%k!<%W$+$i30$l$^$9!#(J
`void`	`send(DatagramPacket p, byte ttl)` $B$=$N%=%1%C%H$N%G%U%)%k%HCM0J30$N(J TTL ($BM-8z4\|4V(J) $B$r;HMQ$7$F!"%G!<%?%0%i%`%Q%1%C%H$r08@h$KAw?.$7$^$9!#(J
`void`	`setInterface(InetAddress inf)` $B$3$N%=%1%C%H$N%^%k%A%-%c%9%H%Q%1%C%HMQ$N!"=PNOMQ%M%C%H%o!<%/%$%s%?%U%'!<%9$r!"%7%9%F%`$N%G%U%)%k%HCM0J30$K@_Dj$7$^$9!#(J
`void`	`setTimeToLive(int ttl)` $B$3$N%=%1%C%H$GAw=P$5$l$k%^%k%A%-%c%9%H%Q%1%C%H$N!"%G%U%)%k%H$NM-8z4\|4V(J (TTL) $B$r@_Dj$7$^$9!#(J
`void`	`setTTL(byte ttl)` $B?d>)$5$l$^$;$s!#(J $BBe$o$j$K(J setTimeToLive $B%a%=%C%I$r;HMQ$7$F$/$@$5$$!#$3$N%a%=%C%I$G$O!"M-8z4\|4V$r(J 0 $B!A(J 255 (0 $B$O4^$^$J$$(J) $B$NHO0O$G@_Dj2DG=$G$9!#(J

$B%/%i%9(J java.net.DatagramSocket $B$+$i7Q>5$7$?%a%=%C%I(J

close, 
connect, 
disconnect, 
getInetAddress, 
getLocalAddress, 
getLocalPort, 
getPort, 
getReceiveBufferSize, 
getSendBufferSize, 
getSoTimeout, 
receive, 
send, 
setReceiveBufferSize, 
setSendBufferSize, 
setSoTimeout

$B%/%i%9(J java.lang.Object $B$+$i7Q>5$7$?%a%=%C%I(J

clone, 
equals, 
finalize, 
getClass, 
hashCode, 
notify, 
notifyAll, 
toString, 
wait, 
wait, 
wait

$B%3%s%9%H%i%/%?$N>\:Y(J

MulticastSocket

public MulticastSocket()
                throws IOException

$B%^%k%A%-%c%9%H%=%1%C%H$r:n@.$7$^$9!#(J

$B%;%-%e%j%F%#%^%M!<%8%c$,B8:_$9$k>l9g!"$^$:%;%-%e%j%F%#%^%M!<%8%c$N(J checkListen $B$,!"0z?t$H$7$F(J 0 $B$r;XDj$7$F8F$S=P$5$l!"$3$NA`:n$,5v2D$5$l$F$$$k$3$H$r3NG'$7$^$9!#$3$N7k2L!"(JSecurityException $B$K$J$k$3$H$,$"$j$^$9!#(J

$BNc30(J:: SecurityException - $B%;%-%e%j%F%#%^%M!<%8%c$,B8:_$7!"%;%-%e%j%F%#%^%M!<%8%c$N(J checkListen $B%a%=%C%I$,$3$NA`:n$r5v2D$7$J$$>l9g(J
$B4XO"9`L\(J:: SecurityManager.checkListen(int)

MulticastSocket

public MulticastSocket(int port)
                throws IOException

$BFCDj$N%]!<%H$K%P%$%s%I$5$l$?%^%k%A%-%c%9%H%=%1%C%H$r:n@.$7$^$9!#(J

$B%;%-%e%j%F%#%^%M!<%8%c$,B8:_$9$k>l9g!"$^$:%;%-%e%j%F%#%^%M!<%8%c$N(J checkListen $B%a%=%C%I$,!"0z?t$H$7$F(J port $B$r;XDj$7$F8F$S=P$5$l!"$3$NA`:n$,5v2D$5$l$F$$$k$3$H$r3NG'$7$^$9!#$3$N7k2L!"(JSecurityException $B$K$J$k$3$H$,$"$j$^$9!#(J

$B%Q%i%a!<%?(J:: port - $B;HMQ$9$k%]!<%H(J
$BNc30(J:: SecurityException - $B%;%-%e%j%F%#%^%M!<%8%c$,B8:_$7!"%;%-%e%j%F%#%^%M!<%8%c$N(J checkListen $B%a%=%C%I$,$3$NA`:n$r5v2D$7$J$$>l9g(J
$B4XO"9`L\(J:: SecurityManager.checkListen(int)

$B%a%=%C%I$N>\:Y(J

setTTL

public void setTTL(byte ttl)
            throws IOException

$B?d>)$5$l$^$;$s!#(J $BBe$o$j$K(J setTimeToLive $B%a%=%C%I$r;HMQ$7$F$/$@$5$$!#$3$N%a%=%C%I$G$O!"M-8z4|4V$r(J 0 $B!A(J 255 (0 $B$O4^$^$J$$(J) $B$NHO0O$G@_Dj2DG=$G$9!#(J

$B$3$N%=%1%C%H$GAw?.$5$l$k%^%k%A%-%c%9%H%Q%1%C%H$N!"%G%U%)%k%H$NM-8z4|4V(J (TTL) $B$r@_Dj$7$^$9!#$3$N(J TTL $B$O!"(JMulticastGroup $B$KAw?.$5$l$k(J DatagramPackets $B$N(J IP $BM-8z4|4V$r@_Dj$7!"M-8z4|4V$,@Z$l$k$^$G$K%Q%1%C%H$,E>Aw$5$l$k!V%[%C%W!W$N?t$r;XDj$7$^$9!#(J

$B$3$N%a%=%C%I$O!"M-8z4|4V$NCM$r(J 1 $B!A(J 127 $B$NHO0O$K@_Dj$9$k>l9g$K$@$1;HMQ$G$-$^$9!#CM$,$3$NHO0OFb$K$J$$>l9g!"$3$N%a%=%C%I$NF0:n$OJ]>Z$5$l$^$;$s!#(J

$B%Q%i%a!<%?(J:: ttl - $BM-8z4|4V(J

setTimeToLive

public void setTimeToLive(int ttl)
                   throws IOException

$B$3$N%=%1%C%H$GAw=P$5$l$k%^%k%A%-%c%9%H%Q%1%C%H$N!"%G%U%)%k%H$NM-8z4|4V(J (TTL) $B$r@_Dj$7$^$9!#$3$N(J TTL $B$O!"(JMulticastGroup $B$KAw?.$5$l$k(J DatagramPackets $B$N(J IP $BM-8z4|4V$r@_Dj$9$k$3$H$K$h$j!"M-8z4|4V$,@Z$l$k$^$G$K%Q%1%C%H$,E>Aw$5$l$k!V%[%C%W!W$N?t$,;XDj$5$l$^$9!#(J

ttl $B$NHO0O$O(J 0 < ttl <= 255 $B$G$J$1$l$P$J$j$^$;$s!#$=$&$G$J$$>l9g$O!"(JIllegalArgumentException $B$,%9%m!<$5$l$^$9!#(J

$B%Q%i%a!<%?(J:: ttl - $BM-8z4|4V(J

getTTL

public byte getTTL()
            throws IOException

$B?d>)$5$l$^$;$s!#(J $BBe$o$j$K(J getTimeToLive $B%a%=%C%I$r;HMQ$7$F$/$@$5$$!#$3$N%a%=%C%I$G$O!"M-8z4|4V$r(J 0 $B!A(J 255 (0 $B$O4^$^$J$$(J) $B$NHO0O$G

$B$3$N%=%1%C%H$GAw=P$5$l$k%^%k%A%-%c%9%H%Q%1%C%H$N!"%G%U%)%k%H$NM-8z4|4V$r@_Dj$7$^$9!#$3$N%a%=%C%I$O!"(J127 $B$h$j$bBg$-$$(J ttl $B$NCM$r!"(J127 $B$K@Z$j$D$a$^$9!#(J

getTimeToLive

public int getTimeToLive() throws IOException

$B$3$N%=%1%C%H$+$iAw?.$5$l$k%^%k%A%-%c%9%H%Q%1%C%H$N%G%U%)%k%H$NM-8z4|4V$r

joinGroup

public void joinGroup(InetAddress mcastaddr) throws IOException

$B%^%k%A%-%c%9%H%0%k!<%W$K;22C$7$^$9!#(J
$B%;%-%e%j%F%#%^%M!<%8%c$,B8:_$9$k>l9g!"$^$:%;%-%e%j%F%#%^%M!<%8%c$N(J checkMulticast $B%a%=%C%I$,!"0z?t$H$7$F(J mcastaddr $B$r;XDj$7$F8F$S=P$5$l$^$9!#(J

$B%Q%i%a!<%?(J:
mcastaddr - $B;22C$9$k%^%k%A%-%c%9%H%"%I%l%9(J
$BNc30(J:
IOException - $B;22C$K%(%i!<$,$"$k$+!"%"%I%l%9$,%^%k%A%-%c%9%H%"%I%l%9$G$J$$>l9g(J
SecurityException - $B%;%-%e%j%F%#%^%M!<%8%c$,B8:_$7!"%;%-%e%j%F%#%^%M!<%8%c$N(J checkMulticast $B%a%=%C%I$,;22C$r5v2D$7$J$$>l9g(J
$B4XO"9`L\(J:
SecurityManager.checkMulticast(InetAddress)

leaveGroup

public void leaveGroup(InetAddress mcastaddr) throws IOException

$B%^%k%A%-%c%9%H%0%k!<%W$+$i30$l$^$9!#(J
$B%;%-%e%j%F%#%^%M!<%8%c$,B8:_$9$k>l9g!"$^$:%;%-%e%j%F%#%^%M!<%8%c$N(J checkMulticast $B%a%=%C%I$,!"0z?t$H$7$F(J mcastaddr $B$r;XDj$7$F8F$S=P$5$l$^$9!#(J

$B%Q%i%a!<%?(J:
mcastaddr - $B%^%k%A%-%c%9%H%"%I%l%9(J
$BNc30(J:
IOException - $BB`5n$K%(%i!<$,$"$k>l9g!"$"$k$$$O%"%I%l%9$,%^%k%A%-%c%9%H%"%I%l%9$G$J$$>l9g(J
SecurityException - $B%;%-%e%j%F%#%^%M!<%8%c$,B8:_$7!"%;%-%e%j%F%#%^%M!<%8%c$N(J checkMulticast $B%a%=%C%I$,$3$NA`:n$r5v2D$7$J$$>l9g(J
$B4XO"9`L\(J:
SecurityManager.checkMulticast(InetAddress)

setInterface

public void setInterface(InetAddress inf) throws SocketException

$B$3$N%=%1%C%H$N%^%k%A%-%c%9%H%Q%1%C%HMQ$N!"=PNOMQ%M%C%H%o!<%/%$%s%?%U%'!<%9$r!"%7%9%F%`$N%G%U%)%k%HCM0J30$K@_Dj$7$^$9!#%^%k%A%[!<%`$N%[%9%H$KJXMx$G$9!#(J

getInterface

public InetAddress getInterface() throws SocketException

$B%^%k%A%-%c%9%H%Q%1%C%H$K;HMQ$9$k%M%C%H%o!<%/%$%s%?%U%'!<%9$N%"%I%l%9$r

send

public void send(DatagramPacket p, byte ttl) throws IOException

$B$=$N%=%1%C%H$N%G%U%)%k%HCM0J30$N(J TTL ($BM-8z4|4V(J) $B$r;HMQ$7$F!"%G!<%?%0%i%`%Q%1%C%H$r08@h$KAw?.$7$^$9!#$3$N%a%=%C%I$O!"FCDj$N(J TTL $B$r;XDj$9$kI,MW$,$"$k>l9g$K$@$1;HMQ$7$^$9!#$=$l0J30$N>l9g$O$=$N%=%1%C%H$N(J TTL $B$r$$$C$?$s@_Dj$7!"$9$Y$F$N%Q%1%C%H$K$=$N(J TTL $B%G%U%)%k%HCM$r;HMQ$9$k$N$,M}A[E*$G$9!#$3$N%a%=%C%I$O!"%=%1%C%H$N(J TTL $B%G%U%)%k%HCM$rJQ99(J$B$7$^$;$s(J$B!#(J
$B%;%-%e%j%F%#%^%M!<%8%c$,B8:_$9$k>l9g!"$3$N%a%=%C%I$O$^$:$J$s$i$+$N%;%-%e%j%F%#%A%'%C%/$rp.getAddress().isMulticastAddress() $B$,(J true $B$G$"$l$P!"$3$N%a%=%C%I$O:G=i$K!"%;%-%e%j%F%#%^%M!<%8%c$N(J checkMulticast $B%a%=%C%I$r!"0z?t$H$7$F(J p.getAddress() $B$*$h$S(J ttl $B$r;XDj$7$F8F$S=P$7$^$9!#>e5-$N<0$N7k2L$,(J false $B$G$"$k>l9g!"$3$N%a%=%C%I$OBe$o$j$K%;%-%e%j%F%#%^%M!<%8%c$N(J checkConnect $B%a%=%C%I$r!"0z?t$H$7$F(J p.getAddress().getHostAddress() $B$*$h$S(J p.getPort() $B$r;XDj$7$F8F$S=P$7$^$9!#$3$NA`:n$,5v2D$5$l$F$$$J$$>l9g!"%;%-%e%j%F%#%^%M!<%8%c$N3F%a%=%C%I8F$S=P$7$N7k2L$O!"(JSecurityException $B$K$J$k$3$H$,$"$j$^$9!#(J

$B%Q%i%a!<%?(J:
p - $BAw?.$9$k%Q%1%C%H!#%Q%1%C%H$K$O08@h%^%k%A%-%c%9%H(J IP $B%"%I%l%9$H!"Aw?.%G!<%?$,4^$^$l$k!#08@h%^%k%A%-%c%9%H%"%I%l%9$K%Q%1%C%H$rAw?.$9$k$?$a$K$O!"$=$N%0%k!<%W$N%a%s%P$G$"$kI,MW$O$J$$(J
ttl - $B%^%k%A%-%c%9%H%Q%1%C%H$NM-8z4|4V(J ($BG$0U(J)$B!#%G%U%)%k%HCM$O(J 1
$BNc30(J:
IOException - $B%(%i!<$,H/@8$7$?>l9g(J (TTL $B$N@_DjCf$K%(%i!<$,H/@8(J)
SecurityException - $B%;%-%e%j%F%#%^%M!<%8%c$,B8:_$7!"%;%-%e%j%F%#%^%M!<%8%c$N(J checkMulticast $B%a%=%C%I$^$?$O(J checkConnect $B$,Aw?.$r5v2D$7$J$$>l9g(J
$B4XO"9`L\(J:
DatagramSocket.send(java.net.DatagramPacket), DatagramSocket.receive(java.net.DatagramPacket), SecurityManager.checkMulticast(java.net.InetAddress, byte), SecurityManager.checkConnect(java.lang.String, int)

$B35MW(J $B%Q%C%1!<%8(J $B%/%i%9(J $B;HMQ(J $B3,AX%D%j!<(J $B?d>)$5$l$J$$(J $B%$%s%G%C%/%9(J $B%X%k%W(J

Java $B%W%i%C%H%U%)!<%`(J 1.2

$BA0$N%/%i%9(J $B $B%U%l!<%`$"$j(J $B%U%l!<%`$J$7(J

$B35MW(J: $BFbIt%/%i%9(J | $B%U%#!<%k%I(J | $B%3%s%9%H%i%/%?(J | $B%a%=%C%I(J $B>\:Y(J: $B%U%#!<%k%I(J | $B%3%s%9%H%i%/%?(J | $B%a%=%C%I(J

$B%P%0$d5!G=MW5a$NJs9p(J
$B?7$7$$(J javadoc $B$NI=<($K$D$$$F$N%3%a%s%H$d$4Ds0F(J
Java $B$O!"JF9q$*$h$S$=$NB>$N9q$K$*$1$kJF9q(J Sun Microsystems, Inc. $B$N>&I8$b$7$/$OEPO?>&I8$G$9!#(J
Copyright 1993-1998 Sun Microsystems, Inc. 901 San Antonio Road,
Palo Alto, California, 94303, U.S.A. All Rights Reserved.

java.net $B%/%i%9(J MulticastSocket

MulticastSocket

MulticastSocket

setTTL

setTimeToLive

getTTL

getTimeToLive

joinGroup

leaveGroup

setInterface

getInterface

send

java.net
$B%/%i%9(J MulticastSocket