Java oaoiieia?y. Iniiai? ?ene oa ia?niaeoeae canoinoaaiiy.
Ci?no.
Iioiaeaeaiiy Java.
Aacia/i?noue.
Aoaeoeai?noue.
a) i?ici??noue ?ioa?oaen?a;
a) eaae?noue i?ia?aioaaiiy;
Ia’?eoii-i???ioiaaia ni?yiiaai?noue.
No?ee?noue aei iiieeie.
I?aeo?eiea aaaaoiiioi/iino?.
Iacaeaaei?noue a?ae a?o?oaeoo?e.
Ia?aaaae ?ioa?i?aoiaaiino? a ii?aeiaii? c aenieith i?iaeoeoeai?noth.
?iciiae?eai?noue.
Aeinooii?noue ?ino?oiaioa??y.
Ia?niaeoeae canoinoaaiiy
?acthia.
Aeaea?aea ?ioi?iaoe??.
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Iioiaeaeaiiy Java.
Iiaa i?ia?aioaaiiy Java ca?iaeeeany a 1991?. a eaai?aoi??yo eiiiai?? Sun
Microsystems inc. sse ia aeeaii, iiooiaoii aeey noai?aiiy Java noaea
cian?i ia Internet. Aieiaiei iioeaii aoea iio?aaa a iia? i?ia?aioaaiiy,
yea ia caeaaeaea a a?ae ieaooi?ie ( oiaoi a?ae a?o?oaeoo?e ) ? yeo
iiaeia aoei a aeei?enoiaoaaoe aeey noai?aiiy i?ia?aiiiai caaacia/aiiy,
yea aaoaeiao?oueny a ??ciiiai?oi? iiaooia? aeaeo?iii? i?eeaaee, oae? ye
iia?euei? caniae ca’yceo, i?eno?i? aeenoaioe?eiiai oi?aae?iiy oiui.
?ic?iaea ia?oi? ?iai/i? aa?n?? caeiyea 18 i?nyoe?a ? aiia iaea iacao
«Oak», aea 1995 ?. i?iaeo aoa ia?eiaiiaaiee ia «Java».
Ia??iae noaiiaeaiiy Java ni?aiaa ca /anii c ?icea?oii i?aeia?iaeii?
?ioi?iaoe?eii? neoaeae World Wide Web. Oey ianoaaeia a?ae?a?aea
ae??oaeueio ?ieue a eaeaooiueiio Java, ine?eueee Web oaae aeiaaaea
ia?aiineieo i?ia?ai. sse iane?aeie, aoee ci?uai? aeoeaioe a ?ic?iaoe?
Sun c iiaooiai? aeaeo?ii?ee ia i?ia?aioaaiiy aeey Internet.
Aacia/i?noue.
World Wide Web aenoioea Java ia ia?aaei?e e?ae i?ia?aioaaiiy, ? Java, a
naith /a?ao, neeueii aieeioea ? iaa?oue ci?ieea iaee//y Internet,
?icoe?eaoe niaeo? ia’?eo?a, ye? iiaeooue ?iciianthaeaeoaaoenue o
e?aa?i?inoi??. I?ia?aie iiai? oi?ie – aieaoe – caaaioaaeothoueny c
a?aeaeaeaiiai na?aa?a ? iiaeooue caioneaoeny aeeiai?/ii, oiaoi aac
o/ano? ei?enooaa/a. Aei iiyae Java oaeee i?aeo?ae aoa iai?eionoeiee c
i??eoaaiue aaciaee oa ia?aiineiino?. A a?o?oaeoo?? aieao?a c?iaeaii ?yae
ooo/ieo iaiaaeaiue, ye? ?iaeyoue ?o oe?eeii aacia/ieie. Ia?o ca ana,
Java ? ?ioa?i?aoiaaiith iiaith ? i?ino?? ?ano?n?a Java-i?ia?aie
iaiaaeaiee oae caaiith a??ooaeueiith Java-iaoeiith (VJM), yea iiaea
eiioi?iethaaoe iiaaae?ieo i?ia?aie ? caoeuaoe nenoaio a?ae iia?/ieo
aoaeo?a, ye? iiaeooue aeieeaoe c aeie aieaoa. E??i oiai, a iia? Java ?
aeiaeaoeia? iaiaaeaiiy, ye? ia aeicaieyoue aieaoo noaoe «o?iinueeei
eiiai». Cie?aia, Java-aieao ia iiaea io?eiaoe aeinooi aei eieaeueiiai
aei?noeiai aeeneo. I?e oae?e ni?ia? aaia?o?oueny aeeeth/ia neooaoe?y.
Aoaeoeai?noue.
Ine?eueee aieaoe Java ?ioa?i?aoothoueny, a ia eiii?eththoueny, oi ?o
aeeiiaiiy ia ??cieo ieaooi?iao cia/ii iieaaoo?oueny. A oeueiio aeiaaeeo
aeinoaoiuei noai?eoe aeey eiaeii? ieaooi?ie aeeiioth/o Java-nenoaio.
sseui ?nio? oaea nenoaia aeey aeaii? iia?aoe?eii? nenoaie, oi aoaeue-yea
Java-i?ia?aia iiaea aeeiioaaoenue a aeaiiio na?aaeiaeu? aac aeiaeaoeiai?
eiii?eyoe?? ia oe?e ieaooi?i?. I?ioa Java ia ? ?ioa?i?aoiaaiith iiaith a
/enoiio ?icoi?ii?. I?ia?aia ia Java eiii?eth?oueny. ?acoeueoaoii ?iaioe
eiii?eyoi?a Java ? aaeoeiae (bytecode). Aaeoeiae – oea iioei?ciaaiee
iaa?? eiiaiae, i?ecia/aiee aeey aeeiiaiiy oyaiei i?eno?i?e –
a??ooaeueii? Java-iaoeiith. A oaeee niin?a aeo?aoe ia ?ioa?i?aoaoe?th
caiaeyoueny aei i?i?ioio, ine?eueee aaeeiae aaea ? iioei?ciaaiei, ?
aeinyaa?oueny aeineoue aeniea i?iaeoeoeai?noue Java-i?ia?ai. Iaaaaeai?
aeua iniaeeaino? aeathoue i?aenoaao ?icaeyaeaoe Java ia ye ua iaeio iiao
i?ia?aioaaiiy, a ye ie?aio ?ioi?iaoe?eio oaoiieia?th. Oaeei /eiii,
?ioa?i?aoaoe?y – oea iaeeaaoee oeyo aei ia?aianaiiy i?ia?ai,
?aae?ciaaiee a Java oaoiieia??. Iacaaaeath/e ia oa ui iiaa Java aoea
?ic?iaeaia a ?ic?aooieo ia ?ioa?i?aoaoe?th, oaoi?/ii iaia? i?/iai
oaeiai, ui a ia?aoeiaeaeaei eiii?eyoe?? aaeoeiaeo a aeeiioaaiee eiae.
Aei aaeoeiaeo, yeee ia?aneea?oueny ii ia?aae?, canoiniao?oueny
aeeiai?/ia eiii?eyoe?y, aea oea i?ye ia aieeaa? ia ia?aiinei?noue oa
aaciaeo, ine?eueee ?iaioo i?ia?aie ana ua eiio?ieth? aeeiioth/a nenoaia.
Oaeee i?aeo?ae canoiniaaii a aaaaoueio aeeiioth/eo nenoaiao Java, ui
caaacia/o? i?iaeoeoeai?noue ia ??ai? iioei?ciaaiiai eiaeo N++.
Iiaa Java ? iaei??th c iaeiieiaeoeo a n?iaenoa? iia i?ia?aioaaiue ?
aoea ?ic?iaeaia c ?ic?aooieo ia oa, uia i?ioan?eiee i?ia?ai?no i?a eaaei
?? iiaioaaoe oa aoaeoeaii aeei?enoiaoaaoe. Ca iniiao Java acyoee
neioaenen N++ – aacnoii?aii iaei??? c iaea?eueo iiioey?ieo iia
i?ia?aioaaiiy no/aniino?. I?ioa, Java – oea oe?eeii naiino?eia iiaa
i?ia?aioaaiiy, ? i?e ?? noai?aii? ia eoeiny i?i aoaeue-yeo noi?ni?noue c
N++. Oiio aeaye? iaoai?cie ?aae?ciaai? a Java ?iaeoa, a aeaye? cian?i
a?aenooi?. ?aeaieia?/ii ae Java iiaoaeiaaia aeaui ?iaeoa i?ae N++.
?ic?iaieee Java a?oiooaaeeny ia aeina?ae? ?ic?iaee i?ia?ai ia N++ ?
i?aaioee iicaooeny iiaeeeainoae, ye? ca?aeiiaiaeoaaee naaa iaiaaieie.
Oae, a Java a?aenooiy ia?aa?ocea iia?aoi??a a oaeiae aaoiiaoe/ia
i?eaaaeaiiy ianoi?nieo oei?a – eiino?oeoe??, ye? i?e iaoaaaeiiio
aeei?enoaii? ? aeaea?aeii aaaeeeo aeey aeyaeaiiy iiieeie. Acaaae?,
?ioa?oaene Java a?eueo i?ino? oa i?ici?? aeey ?icoi?iiy. Iaienaoe ia
Java i?ia?aio c a?ao?/iei ?ioa?oaenii cia/ii eaaoa. Cae/aeii, i?inoioa
?ioa?oaen?a eiiiaino?oueny iaioith aio/e?noth, a?ae?ioaea Java ia oaea
aaaaoa, ye noaiaea?oi? a?ae?ioaee N/N++. Aea caaaeaeii, ui Java
caaeoiaiee aeey aeei?enoaiiy ia ??cieo ieaooi?iao ? oiio ?aae?co? a nia?
iaea?eueo noaiaea?oi? iiaeeeaino? caaeey eaaoi? aaeaioaoe?? i?ae
eiie?aoia na?aaeiaeua.
Ia’?eoii-i???ioiaaia ni?yiiaai?noue.
A?ae N++ Java oniaaeeoaaea iiooaeiee iaoai?ci ia’?eoii-i???ioiaaiiai
i?ia?aioaaiiy. Ine?eueee Java ?ic?iaethaaany «ia ionoiio i?noe?», oiaoi
ia aoei iio?aae caaacia/oaaoe noi?ni?noue c iiia?aaei?ie aa?n?yie,
?ic?iaieee iaee iiaio naiaiaeo ieneaiiy. A ?acoeueoao? aoa noi?iiaaiee
yniee ? i?aaiaoe/iee i?aeo?ae aei ia’?eo?a. A?eueii ia?aeiath/e ?aea?,
ye? ?aae?ciaoaaeeny i?ioyaii inoaii?o aeanyoe??/ue, iia? Java aaeaeiny
ciaeoe ??aiiaaao i?ae ia?aaeeaiith «ana ? ia’?eoii» ? i?aaiaoe/iei
i?aeoiaeii. Ia’?eoia iiaeaeue Java i?inoa ? eaaei ?icoe?th?oueny, a oie
/an ye i?in? oeie, ye oe?e?, caa??aathoueny ye aeai?, ui ia ? ia’?eoaie,
ui aeicaiey? cia/ii i?aeaeueoe oaeaee?noue i?e ?o ia?iaoe?.
No?ee?noue aei iiieeie.
Aaaaoiieaooi?iai?noue na?aaeiaeua Web aenoaa? iaaecae/aeii aenie?
aeiiae aei iaae?eiino? i?ia?ai. sse iane?aeie, i?e ?ic?iaoe? Java
i?ei??oao aoa a?aeaeaiee iiaeeeaino? noai?aiiy no?eeeo aei iiieeie
i?ia?ai. Java ca?eueiy? i?ia?ai?noa a?ae oaeethaaiue c i?eaiaeo
aaaaoueio iioe?aieo i?e/ei, ye? aeeeeeathoue iiieeee i?ia?aioaaiiy. sse
aaea caaaeoaaeiny, Java ? no?iai oei?iaaiith iiaith i?ia?aioaaiiy. Ua
aeeiioth/a nenoaia Java aa?a ia naaa «i?eae?aiiy ni?ooy», oiaoi
aaoiiaoe/ii ca?eueiy? iai’youe, yea aoea ?iciiae?eaia aeeiai?/ii.
Cae/aeii, oea aeaui cieaeo? aoaeoeai?noue eiaeo, aea caiia?aa? oeiiaeo
iiieeie, eiee i?ia?ai?no caaoaa? ca?eueieoe aeae?eaio iai’youe, aai,
iaaiaee, ca?eueiy? iai’youe, yea ua aeei?enoiao?oueny. Java i?aeo?eio?
ia’?eoii-i???ioiaaio ia?iaeo aeeeth/ieo neooaoe?e iiae?aii aei N++. Aea
ia a?aei?io a?ae N++ a Java ia?iaea aeeeth/ieo neooaoe?e ?
iaia’yceoaith. Oiaoi iaiiaeeeai neiii?ethaaoe i?ia?aio, yea a?aee?eaa?
oaee, ia ia?iaeaoe iiaeeea? iiieeee oeio «oaee ia ciaeaeaii», ye?
aeieeathoue i?e oeueiio. Aeia?a iaienaia Java-i?ia?aia iiaea naia
ia?iaeyoe an? iiieeee /ano aeeiiaiiy.
I?aeo?eiea aaaaoiiioi/iino?.
Java ?ic?iaeyyeany c i???ioaoe??th ia aeiiae aei noai?aiiy
?ioa?aeoeaieo i?ia?ai, ye? i?aoeththoue c ia?aaeath. C oe??th iaoith
Java i?aeo?eio? aaaaoiiioi/ia i?ia?aioaaiiy, yea aeicaiey? eaaei
?ic?iaeyoe i?ia?aie, ui aeeeiothoue aaaaoi i?ioean?a iaeii/anii.
Aeeiiaiiy Java-i?ia?aie caniiaaii ia aeaaioiiio, aea a oie naiee /an
aenieii?aai?ciaaiiio ??oaii? aaaaoii?ioeaniai? neio?ii?caoe??, yea
aeicaiey? aai noai?thaaoe aenieiaoaeoeai? ?ioa?aeoeai? nenoaie.
Iacaeaaei?noue a?ae a?o?oaeoo?e.
Iniiaiei ieoaiiyi aeey ?ic?iaiee?a Java noaei ieoaiiy aeiaaio?eaaeino?
oa ia?aiineiino?. Iaeia c aieiaieo i?iaeai, ?c yeith cono??eeny
i?ia?ai?noe, iieyaaea a a?aenooiino? aa?aio?e oiai, ui iaienaia
nueiaiaei? i?ia?aia caao?a i?aoethaaoeia c oei aea oni?oii, i?e/iio ia
o?e nai?e iaoei?. Iiiaeaiiy iia?aoe?eii? nenoaie, iiaea?i?caoe?y
i?ioeani?a oa ci?ia ia’?io iia?aoeaii? iai’yo? iiaeooue i?ecaanoe aei
caith i?ia?aie. ?iuc?iaieee Java, i?aaioee ci?ieoe oeth neooaoe?th ?
i?eeiyee aeae?eueea aaaeeeo ??oaiue a?aeiinii iiae Java oa i?ioeano
aeeiiaiiy Java-i?ia?aie. ?o iaoa iieyaaea a oiio, uia «iaeiiai ?aco
iaienaia i?aoethaaei anthaee, a ethaee /an ? caaaeaee». Aiane?aeie
oeueiai Java ? nenoaiith, yea eaaei ?icoe?th?oueny ca ?aooiie noai?aiiy
iiaeo noaiaea?oieo eean?a oa a?ae?ioae.
Ia?aaaae ?ioa?i?aoiaaiino? a ii?aeiaii? c aenieith i?iaeoeoeai?noth.
sse aaea caaaeoaaeinue, Java aeicaey? noai?thaaoe iacaeaaei? a?ae
ieaooi?ie i?ia?aie oeyoii eiii?eyoe?? a i?ii?aeia i?aaenoaaeaiiy, yea
iaceaa?oueny aaeoeiaeii. Aaaaoi iiia?aaei?o ni?ia ci?ia ciaoe ?ica’ycie
i?iaeaie iacaeaaeiino? a?ae ieaooi?ie aoee c?iaeai? ca ?aooiie
i?iaeoeoeaiino?. ?ioa?i?aooth/? nenoaie, iiae?ai? aei BASIC, Perl,
no?aaeaeathoue ia iaeaea iaiiaeieaiiee aeao?oeeo i?iaeoeoeaiino?. Oea
aoei a?aoiaaii i?e noai?aii? Java.. Iacaaaeath/e ia oa, ui Java ?
?ioa?i?aoiaaiith iiaith, aaia?aoe?y aaeoeiae?a aoea ?aoaeueii
iioei?ciaaia a oaeee niin?a, uia iaea?aeoaaiee aaeoeiae iiaeia aoei
eaaei ia?aeeaaeaoe a iaoeiiee eiae, yeee i?aoeth? c aeoaea aenieith
i?iaeoeoeai?noth. Aeeiioth/? nenoaie oaeiai ?iaeo ia ao?a/athoue
aeiaeieo ia?aaaa ia?aiineiiai eiaeo.
?iciiae?eai?noue.
Iiaa Java i?ecia/aia aeey noai?aiiy i?ia?ai, ye? i?aoeththoue a
?iciiae?eaiiio na?aaeiaeu? Internet ia aac? i?ioieie?a TCP/IP.
Iani?aaae? aeinooi aei ?ano?n?a ca aeiiiiiaith URL a?ae??ciy?oueny a?ae
aeinooio e oaeeo. E??i oiai a Java iayaiee can?a ia?aaea/? iia?aeiieaiue
a iaaeao aioo??oiueiai aae?aniiai i?inoi?o. Oea aeicaiey? caaania/eoe
a?aeaeaeaia aeeiiaiiy i?ioeaaeo?. Oe? ?ioa?oeene aeeth/ai? o iaeao RMI
(remote metod invocation). Oeae can?a i?eaiineoue aenieee ??aaiue
aano?aeoe?? a i?ia?aioaaiiy aee y na?aaeiaeua ee??io/na?aa?.
Java-i?ia?aie ianooue o nia? cia/iee ianya ?ioi?iaoe?? i?i oeie /ano
aeeiiaiiy (run-time type information), yea aeei?enoiao?oueny aeey
aeicaieo aeinooio aei ia’?eo?a i?ae /an ?iaioe i?ia?aie. Oea aeicaiey?
caaacia/eoe aacia/io oa iioeiaeueio aeeiai?/io eiiiiiiaeo. A oaeee
niin?a aeinyaa?oueny caoeuai?noue na?aaeiaeua aeeiiaiiy aieao?a.
Aeinooii?noue ?ino?oiaioa??th oa aoaeoeai?noue ?ic?iaie.
Cacia/aia aeua i?inoioa i?ia?aioaaiiy ia Java ? i?e/eiith oiai, ui
?ic?iaee ia Java eioooaaoeiooue aeaoaaoa aiaeia?/ieo ia a?eueo iiooaei?o
iiaao i?ia?aioaaiiy. Oeueiio ae ni?ey? ? ia?aiinei?noue i?ia?ai ia Java,
ine?eueee e?ea?aeothoueny aeo?aoe iia’ycai? c aaeaioaoe??th i?ia?aie ia
eiie?aoi?e ieaooi?i?. Aei oiai ae ?ioaa?iaai? i?ia?aie-iaieiiee aeey
?ic?iaee Java i?ia?ai eiooothoue iaaaaaoi aeaoaaoa ( 70-100$ ) i?ae
aiaeia?/i? i?iaeoeoe C++, Delphi ( ~1000$). A iaa?? ?ino?oiaioa??th aeey
iaeaoii? eiii?eyoe?? Java i?ia?ai JDK (Java Development Kit) ? acaaae?
freeware. Oiio ieaooi?io Java iiaeia ?aeiiaiaeoaaoe ye ?aeaaeueio aeey
noai?aiiy iaeiia?oe?eieo i?ia?aiieo i?iaeoeo?a, cie?aia aeey aaeoc?
ina?oe.
Ia?niaeoeae canoinoaaiiy.
I?ia?aie ia Java iiaeooue ciaeoe ??cia canoinoaaiiy a iaa/aeueiiio
i?ioean?: ?ioa?aeoeai? iaa/ath/? i?ia?aie (HTML a ii?aeiaii? c Java),
i?ia?aie-oanoe ? iniaeeai ae?eia? ?a?e. Aeiaeaoeia? ia?aaaae iiaeia
io?eiaoe, yeui ienoaoe oe? i?ia?aie o aeaeyae? aieao?a, ye?
?i?oe?ae?cothoueny c Web na?aa?a aioo??oiuei? ia?aae? Intranet. A oaeee
niin?a iiaeia oieeiooe ?inoaeyoe?? i?ia?aie ia aaaaoueio eiii’thoa?ao –
ei?enooaa/ i?inoi caionea? Web-a?ioca? ? caa?oaea? iio??aio noi??ieo.
Aeey oanoiaeo i?ia?ai, iaienaieo ia Java c aeei?eneoaiiyi a?o?oaeoo?e
ee??io/na?aa? iiaeia i?aeaeueoe nooi?iue eiio?aeaioe?eiino?. Aaca aeaieo
oanoiaeo caieoaiue ciaoiaeeoueny ia na?aa?? a eaoaeic? c iaiaaeaiei
aeinooiii. Eiee ei?enooaa/ caa?oaea? aieao, a?i aaoiiaoe/ii
i?aeeeth/a?oueny aei i?ia?aie-na?aa?a, yea aeeiio?oueny ia na?aa?? ?
iiaea aeaeaaaoe caieoaiiy c aace aeaieo o a?aeiia?aeue ia caieo
ei?enooaa/a. A oaeee niin?a oiaiiaeeeaeth?oueny aee?aaeaiiy aace aeaieo,
ca oiiae a?aenooiino? o?ce/iiai aeinooio aei na?aa?o o ei?enooaa/?a.
Ie?aia ieoaiiy – iaa/aeuei? ae?eia? ?a?e. I?ae oaeith a?ith ?icoi?oeiai
a?o, ca o/anoth e?eueeio ei?enooaa/?a, a ye?e ia?oueny ia oaac?
aeeiai?/iee iai?i ?ioi?iaoe??th i?ae ieie. Nenoaia aaciaee Java
iaeeaaea? iaiaaeaiiy, aiane?aeie yeiai aieao iiaea anoaiiaethaaoe
c’?aeiaiiy eeoa c oinoii, c yeiai a?i aoa caa?oaeaiee ? i? c yeei
a?eueoa. Aea oea iaiaaeaiiy eaaei iaoiaeeoueny: ia na?aa?? aeeiio?oueny
i?ia?aia-na?aa?, c yeith c’?aeiothoueny on? ee??ioe ? /a?ac yeo
cae?enith?oueny iai?i ?ioi?iaoe??th. Oaeei /eiii oaea i?ia?aia iiaeiia
iaoe a?o?oaeoo?o ee??io/na?aa?. A yeino? i?eeeaaea iaaaaeo ni?iuaio
chat-i?ia?aio. A i?e ?aae?ciaai? aacia? caniae aeey noai?aiiy ae?eiai?
a?e.
Na?aa?ia /anoeia i?ia?aie acyoa c eieae Iioii I. Oeeaeo A. «Iieiue
ni?aai/iee ii Java»:-Eeaa, «Aeeaeaeoeea», 1997 ? ? i?aeoe/ii
oi?aa?naeueiith aeey i?ia?ai oaeiai eeano. Iiaeeeaa eaaea
aeiii?aoethaaiiy oe??? i?ia?aie a a?e ?icoe?aiiy e?eueeino?
i?ioieieueieo eiiaiae. Ee??ionueea /anoeia aoea iaienaia iiith. I?ia?aia
i?aoeth? ianooiiei /eiii: ei?enooaa/ caionea? aieao ?c na?aa?a,
aaiaeeoue na?e ?aeaioeo?eaoi? ? aa/eoue ia?ae?e ?aeaioeo?eaoi??a
ei?enooaa/?a, ye? i?ae’?aeiai? aei na?aa?a. I?ney /iai ei?enooaa/ ia?
ciiao iai?ithaaoenue iia?aeiieaiiyie c ?ioeie. Ei?enooaa/ iaea?aeo?
iia?aeiieaiiy a ?ac? i?ae’?aeiaiiy aai a?ae’?aeiaiiy ei?enooaa/?a.
I?ia?aia neeaaea?oueny c 4 eean?a: Server, ClientConnection, Client oa
ServerConnection. Ia?o? 2 eeane a?aeiinyoueny aei na?aa?ii? /anoeie,
ae?oa? 2 – aei ee??ionueei?.
Eean Server:
import java.net.*;
import java.io.*;
import java.util.*;
public class Server implements Runnable {
private int port = 6564;
private Hashtable idcon = new Hashtable();
private int id = 0;
static final String CRLF = “\r\n”;
synchronized void addConnection(Socket s) {
ClientConnection con = new ClientConnection(this, s, id);
id++;
}
synchronized void set(String the_id, ClientConnection con) {
idcon.remove(the_id) ;
con.setBusy(false);
Enumeration e = idcon.keys();
while (e.hasMoreElements()) {
String id = (String)e.nextElement();
ClientConnection other = (ClientConnection) idcon.get(id);
if (!other.isBusy())
con.write(“add ” + other + CRLF);
}
idcon.put(the_id, con);
broadcast(the_id, “add ” + con);
}
synchronized void sendto(String dest, String body) {
ClientConnection con = (ClientConnection)idcon.get(dest);
if (con != null) {
con.write(body + CRLF);
}
}
synchronized void broadcast(String exclude, String body) {
Enumeration e = idcon.keys();
while (e.hasMoreElements()) {
String id = (String)e.nextElement();
if (!exclude.equals(id)) {
ClientConnection con = (ClientConnection) idcon.get(id);
con.write(body + CRLF);
}
}
}
synchronized void delete(String the_id) {
broadcast(the_id, “delete ” + the_id);
}
synchronized void kill(ClientConnection c) {
if (idcon.remove(c.getId()) == c) {
delete(c.getId());
}
}
public void run() {
try {
ServerSocket acceptSocket = new ServerSocket(port);
System.out.println(“Server listening on port ” + port);
while (true) {
Socket s = acceptSocket.accept();
addConnection(s);
}
} catch (IOException e) {
System.out.println(“accept loop IOException: ” + e);
}
}
public static void main(String args[]) {
new Thread(new Server()).start();
try {
Thread.currentThread().join();
} catch (InterruptedException e) {
}
}
}
Oeae iaaaeeeee eean ?aae?co? i?ia?aio-na?aa?. Oi/ea aoieo i?ia?aie –
ooieoe?y main. A i?ia?ai? noai?th?oueny aieiaiee iio?e, a yeiio
noai?th?oueny ia’?eo noaiaea?oiiai eeano ServerSocket. Oeae ia’?eo
i?e?aeio?oueny aei iaaiiai ii?oa ? a oeeee? cae?enith?oueny ia?aa??ea ia
i?aeeeth/aiiy ee??ioa aei ii?oa. A ?ac? oaeiai i?aeeeth/aiiy
noai?th?oueny ia’?eo oeio ClientConnection, a yeiio ?aae?ciaaiee iio?e
ii iieooaaiith nieaoa, aei yeiai i?aeeeth/aiee ee??io, oa ia?iaea
i?ioieieueieo eiiaiae. Eean Server ? oi?aa?naeueiei ? i?/iai ia cia? i?i
iia?aeiieaiiy, yeeie iai?iththoueny a?aaoe? (ee??ioe). A iueiio
?aae?ciaaia eeoa i?e?aeiaiiy/a?ae’?aeiaiiy ee??io?a, iaaeneeaiiy no?iee
iaaiiio ee??ioo oa ooieoe?y broadcast yea, ye c?icoi?ei c iacae,
iaaeneea? iia?aeiieaiiy on?i ca?a?no?iaaiei ee??ioai.
Eean ClientConnection:
import java.net.*;
import java.io.*;
import java.util.*;
class ClientConnection implements Runnable {
private Socket sock;
private DataInputStream in;
private OutputStream out;
private String host;
private Server server;
private static final int bufsize = 8192;
private byte buffer[] = new byte[bufsize];
private static final String CRLF = “\r\n”;
private String name = null;
private String id;
private boolean busy = false;
public ClientConnection(Server srv, Socket s, int i) {
try {
server = srv;
sock = s;
in = new DataInputStream(s.getInputStream());
out = s.getOutputStream();
host = s.getInetAddress().getHostName();
id = “” + i;
// tell the new one who it is…
write(“id ” + id + CRLF);
new Thread(this).start();
} catch (IOException e) {
System.out.println(“failed ClientConnection ” + e);
}
}
public String toString() {
return id + ” ” + host + ” ” + name;
}
public String getHost() {
return host;
}
public String getId() {
return id;
}
public boolean isBusy() {
return busy;
}
public void setBusy(boolean b) {
busy = b;
}
public void close() {
server.kill(this);
try {
sock.close(); // closes in and out too.
} catch (IOException e) {
}
}
public void write(String s) {
byte buf[] = new byte[s.length()];
s.getBytes(0, buf.length, buf, 0);
try {
out.write(buf, 0, buf.length);
} catch (IOException e) {
close();
}
}
private String readline() {
try {
return in.readLine();
} catch (IOException e) {
return null;
}
}
static private final int NAME = 1;
static private final int QUIT = 2;
static private final int TO = 3;
static private final int DELETE = 4;
static private Hashtable keys = new Hashtable();
static private String keystrings[] = {
“”, “name”, “quit”, “to”, “delete”
};
static {
for (int i = 0; i Aeaea?aea ?ioi?iaoe??: http://www.sun.com/ Niaoeeo?eaoe?y iiae i?ia?aioaaiiy Java. Iioii Iao?ee, Oeeaeo Aa?aa?o. Iieiue ni?aai/iee ii Java.: Ia?. n aiae.: - E.: Aeeaeaeoeea, 1997. No?aono?oi Auey?i. sscue i?ia?aiie?iaaiey N++.: Ia?. n aiae.: - E.: AeeaNioo, 1993. Iaae/aneea ca?ia Sun. COMPUTER WORLD Eeaa, ?29-30 (19 aaaonoa 1998) n.10. Oe?ie ia i?ia?aii? i?iaeoeoe. ( Ii iaoa??aeai Hot-line). PAGE PAGE 1
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