Ellhniko Java CGI HOWTO

Ellhniko Java CGI HOWTO
David H. Silber [email protected]
v0.5, 1 Dekembrioy 1998

Ayto to eggrafo HOWTO ejhgei pws na ry8misete to diakomisth sas wste
na epitrepei programmata CGI grammena se Java kai pws na xrhsimopoih�
sete th Java sto na grafete programmata CGI. An kai ayta ta HOWTO
eggrafa stoxeuoyn se xrhsh me to leitoyrgiko susthma Linux, ayto to
sygkekrimeno den einai ejartwmeno apo th sygkekrimenh ekdosh toy Unix
poy xrhsimopoieite.
______________________________________________________________________

Table of Contents

1. Eisagwgh

1.1 Progenesterh Gnwsh
1.2 Ayto to Eggrafo
1.3 To paketo
1.4 H Lista Taxydromeioy

2. Ry8mizontas to Diakomisth sas na trexei programmata Java CGI (me epejhghseis)

2.1 Apaithseis Systhmatos
2.2 Epipros8eto Logismiko Java CGI
2.3 3epaketarontas ton phgaio kwdika
2.4 Apofasiste gia tis politikes topikwn diadromwn sas
2.5 Elegxontas thn egkatastash sas

3. Ry8mizontas ton Diakomisth sas na trexei programmata Java CGI (o suntomos tropos)

4. Ektelwntas ena programma Java CGI

4.1 Empodia sto trejimo programmatwn Java katw apo to montelo CGI
4.1.1 Den mporeite na trejete programmata Java opws ta kanonika ektelesima.
4.1.2 H Java den exei genikh prosbash sto periballon.
4.2 3epernwntas problhmata sto trejimo programmatwn Java CGI
4.2.1 To java.cgi script
4.2.2 Kalwntas to java.cgi apo mia forma HTML

5. Xrhsimopoiwntas tis Java CGI Klaseis

5.1 CGI
5.1.1 Suntajh klashs
5.1.2 Perigrafh klashs
5.1.3 Perilhch melwn
5.1.4 Deite epishs
5.1.5 CGI()
5.1.6 getNames()
5.1.7 getValue()
5.2 CGI[lowbar]Test
5.2.1 Perilhch melwn
5.2.2 Deite epishs
5.2.3 main()
5.3 Email
5.3.1 Suntajh Klashs
5.3.2 Perigrafh klashs
5.3.3 Perilhch melwn
5.3.4 Deite epishs
5.3.5 Email()
5.3.6 send()
5.3.7 sendTo()
5.3.8 subject()
5.4 Email[lowbar]Test
5.4.1 Perilhch melwn
5.4.2 Deite epishs
5.4.3 main()
5.5 HTML
5.5.1 Suntajh klashs
5.5.2 Perigrafh klashs
5.5.3 Perilhch melwn
5.5.4 Deite epishs
5.5.5 HTML()
5.5.6 author()
5.5.7 definitionList()
5.5.8 definitionListTerm()
5.5.9 endList()
5.5.10 listItem()
5.5.11 send()
5.5.12 title()
5.6 HTML[lowbar]Test
5.6.1 Perilhch melwn
5.6.2 Deite epishs
5.6.3 main()
5.7 Text
5.7.1 Suntajh klashs
5.7.2 Perigrafh klashs
5.7.3 Perilhch melwn
5.7.4 Deite epishs
5.7.5 add()
5.7.6 addLineBreak()
5.7.7 addParagraph()

6. Mellontika Sxedia

7. Allages

7.1 Allages apo thn 0.4 sthn 0.5
7.2 Allages apo thn 0.3 sthn 0.4
7.3 Allages apo thn 0.2 sthn 0.3
7.4 Allages apo thn 0.1 sthn 0.2

______________________________________________________________________

1. Eisagwgh

Ejaitias toy tropoy poy h Java einai sxediasmenh, o programmatisths
den exei eukolh prosbash stis metablhtes periballontos toy systhmatos.
Ejaitias toy tropoy poy einai ry8mismeno to Java Development Kit
(JDK), einai anagkaio na xrhsimopoieite pollapla sumbola gia na
kaleite ena programma, to opoio den kollaei kai polu kala me ton
typiko tropo leitoyrgiwn me formes/CGI ths HTML. Yparxoyn tropoi
antimetwpishs aytwn twn periorismwn, kai exw efarmosei enan apo
aytous. Diabaste peraiterw gia leptomereies.

Apo tote poy egraca thn prohgoumenh paragrafo to 1996, exoyn ginei
polles allages sthn texnologia Java. Einai pi8anon pws mia kaluterh
lush gia na trexete Java programmata sthn pleyra-toy-diakomisth, einai
twra dia8esimh -- isws na prepei na rijete mia matia sta servlets.

1.1. Progenesterh Gnwsh

Ypo8etw oti exete mia genikh gnwsh ths HTML kai twn ennoiwn CGI kai
toylaxiston mia elaxisth gnwsh toy diakomisth HTTP sas. 8a prepei
epishs na gnwrizete pws na programmatisete se Java, alliws polla apo
ayta de 8a bgazoyn nohma.

1.2. Ayto to Eggrafo

H teleytaia ekdosh aytou toy eggrafoy mporei na diabastei sthn
http://www.orbits.com/software/Java_CGI.html.

1.3. To paketo

H teleytaia ekdosh toy paketoy poy perigrafetai edw mporei na
prospelastei mesw anwnymo FTP sto
ftp://ftp.orbits.com/pub/software/java_cgi-0.5.tgz. H dianomh toy
paketoy periexei phgaio kwdika SGML gia ayto to eggrafo.

To paketo dianemetai katw apo toys oroys ths GNU Biblio8hkhs Genikhs
Adeias toy Koinou (Library General Public License). Ayto to eggrafo
mporei na dianemh8ei katw apo toys oroys ths shmeiwshs pneymatikwn
dikaiwmatwn twn Linux HOWTOs.

An xrhsimopoieite ayto to logismiko, parakalw kante kapoia anafora
sthn http://www.orbits.com/software/Java_CGI.html, etsi wste kai alloi
na mporoun na briskoyn tis klaseis Java CGI.

Den exw allo xrono gia na synthrw kai na yposthrizw ayto to paketo,
opote ayth pi8anon na einai h teleytaia toy kykloforia. An kaneis
ekei ejw einai arketa erwteymenos me ayto to logismiko wste na euxetai
na analabei th synthrhsh toy, parakalw epikoinwnhste mazi moy sthn
[email protected].

1.4. H Lista Taxydromeioy

Exw dhmioyrghsei mia lista majordomo wste na epitrepw an8rwpoys na
boh8oun o enas ton allon, na lunoyn amoibaia ta problhmata toys
egka8istwntas kai xrhsimopoiwntas ayto to logismiko. Steilte ena
mhnyma sthn [email protected], perilambanontas th lejh
subscribe.

2. Ry8mizontas to Diakomisth sas na trexei programmata Java CGI (me
epejhghseis)

Ayto to tmhma 8a sas ka8odhghsei kata thn egkatastash toy paketoy moy
Java CGI me af8ones epejhghseis etsi wste na gnwrizete poia 8a einai
ta apotelesmata twn energeiwn sas. An aplws 8elete na egkatasthsete
ta programmata kai den endiafereste ka8oloy gia ta giati kai gia
poioys logoys, phgainete sthn ``Ry8mizontas ton Diakomisth sas na
trexei programmata Java CGI (o suntomos tropos)''.

2.1. Apaithseis Systhmatos

Ayto to logismiko 8a prepei na doyleuei se ka8e unix-like diakomisth
istou poy exei egkatesthmeno to Java Development Kit. Egw to
xrhsimopoiw se ena susthma Debian Linux poy trexei ton apache san
daimona HTTP. An diapistwsete oti den trexei ston diko sas
diakomisth, parakalw epikoinwnhste me th lista taxydromeioy. Deite th
``The Mailing List'' gia leptomereies.

Dystyxws, o Java run-time diermhneyths fainetai na einai kati san
fataoulas mnhmhs -- isws na 8elete na rijete liga perissotera
megabytes apo RAM ston ejyphrethth sas an 8a xrhsimopoieite polu
programmata Java CGI.

2.2. Epipros8eto Logismiko Java CGI

To logismiko poy egraca gia na boh8hsei se ayto legetai Java CGI.
Mporeite na to parete apo to
ftp://ftp.orbits.com/pub/software/java_cgi-0.5.tgz. (O ari8mos
ekdoshs mporei na exei allajei).

2.3. 3epaketarontas ton phgaio kwdika

Breite enan katalogo poy sas boleuei ston opoio 8a jepaketarete ayto
to paketo. (An den exete akomh ena sta8ero topo na topo8eteite
paketa, proteinw na xrhsimopoihsete ton /usr/local/src.) 3epaketarete
th dianomh me ayth thn entolh:

gzip -dc java_cgi-0.5.tgz | tar -xvf -

Ayth 8a dhmioyrghsei enan katalogo me onoma java_cgi-0.5. Ekei mesa
8a breite ta arxeia poy anaferontai sto ypoloipo aytou toy eggrafoy.
(An o ari8mos ekdoshs exei allajei, xrhsimopoihste tis odhgies poy
briskontai sth dianomh poy katebasate).

2.4. Apofasiste gia tis politikes topikwn diadromwn sas

Prepei na apofasisete pou 8elete na zoyn ta Java CGI programmata sas.
Genika, 8a 8elete na ta topo8ethsete se enan katalogo parallhla me ton
cgi-bin katalogo sas. O dikos moy diakomisths apache htan ry8mismenos
na xrhsimopoihsei ton /var/www/cgi-bin san ton cgi-bin katalogo, opote
xrhsimopoiw ton /var/www/javacgi san ton katalogo poy topo8etw mesa ta
Java CGI programmata. Pi8anws na mh 8elete na topo8ethsete ta Java
CGI programmata sas mesa se enan apo toys yparxontes katalogoys
CLASSPATH. Epejergasteite to Makefile wste na antikatoptrizetai h
ru8mish toy systhmatos sas. Epibebaiwste oti exete prosbash ws
xrhsths root kai trejte thn entolh make install. Ayth 8a
metaglwttisei ta Java programmata, 8a tropopoihsei to java.cgi senario
gia na tairiazei me to susthma sas kai 8a egkatasthsei ta programmata
sta aparaithta merh. An 8elete thn HTML ekdosh ayths ths tekmhriwshs
kai ena HTML test eggrafo epipleon, trejte thn entolh make all anti
ayths.

2.5. Elegxontas thn egkatastash sas

Egkatesthmena apo th dianomh einai HTML eggrafa poy onomazontai
javacgitest.html, javaemailtest.html kai javahtmltest.html. Ean ta
egkatasthsate ola - all sto prohgoumeno meros, 8a einai ston katalogo
poy ka8orisate gia WEBDIR sto Makefile. An den to kanate, mporeite na
trejete thn entolh make test gia na ta xtisete apo ta
javacgitest.html-dist, javaemailtest.html-dist kai javahtmltest.html-
dist.

Otan eiste sigoyroi pws h egkatastash sas doyleuei swsta, isws na
epi8ymeite na diagracete ta CGI_Test.class, Email_Test.class kai
HTML_Test.class apo ton JAVACGI katalogo sas kai ta javacgitest.html,
javaemailtest.html kai javahtmltest.html apo ton WEBDIR katalogo sas
afou deixnoyn sto xrhsth plhrofories poy einai kanonika mono
dia8esimes ston diakomisth.

3. Ry8mizontas ton Diakomisth sas na trexei programmata Java CGI (o
suntomos tropos)

� Parte to paketo Java CGI apo to
ftp://ftp.orbits.com/pub/software/java_cgi-0.5.tgz. (O ari8mos
ekdoshs mporei na exei allajei).

� 3epaketarete th dianomh me ayth thn entolh:

gzip -dc java_cgi-0.5.tgz | tar -xvf -

(An o ari8mos ekdoshs exei allajei, xrhsimopoihste tis odhgies mesa
apo ekeinh th dianomh apo ayto to shmeio kai ustera).

� Epejergasteite to Makefile poy 8a breite sto molis dhmioyrghmeno
katalogo java_cgi-0.5 wste na einai katallhlo gia to susthma sas.

� San root, trejte thn entolh make install. Ayth 8a metaglwttisei ta
Java programmata, 8a efarmosei tis sygkekrimenes plhrofories sto
susthma sas kai 8a egkatasthsei ta diafora arxeia. An 8elete thn
HTML ekdosh ayths ths tekmhriwshs kai ena HTML test eggrafo, trejte
thn entolh make all anti ayths.

� 8a prepei na eiste etoimoi na jekinhsete.

4. Ektelwntas ena programma Java CGI

4.1. Empodia sto trejimo programmatwn Java katw apo to montelo CGI

Yparxoyn duo kuria problhmata sto trejimo enos programmatos Java apo
enan diakomisth istou:

4.1.1. Den mporeite na trejete programmata Java opws ta kanonika
ektelesima.

Xreiazetai na trejete ton diermhnea Java run-time kai na parexete thn
arxikh klash (programma gia na trejete) sth grammh entolwn. Me mia
forma HTML, den yparxei kamia frontida gia na stelnete mia grammh
entolwn ston diakomisth istou.

4.1.2. H Java den exei genikh prosbash sto periballon.

Ka8e metablhth periballontos poy 8a xreiastei apo to programma Java
prepei na perastei me safhneia. Den yparxei kamia me8odos paromoia me
th leitoyrgia ths C, getenv() .

4.2. 3epernwntas problhmata sto trejimo programmatwn Java CGI

Gia na antimetwpisete ayta ta empodia, egraca ena CGI programma
kelufoys poy parexei tis plhrofories poy xreiazontai apo ton Java
diermhnea.

4.2.1. To java.cgi script

Ayto to senario kelufoys diaxeirizetai thn allhlepidrash metaju toy
HTTP daimona kai toy programmatos Java CGI poy epi8ymeite na
xrhsimopoihsete. Ejagei to onoma toy programmatos poy 8elete na
trejete apo ta dedomena poy parexontai apo to diakomisth. Syllegei
ola ta dedomena periballontos se ena proswrino arxeio. Ustera, trexei
ton Java run-time diermhnea me to onoma toy arxeioy apo tis
plhrofories periballontos kai to onoma toy programmatos poy proste8hke
sth grammh-entolwn.

To java.cgi script diamorfw8hke kai egkatasta8hke sto ``Apofasiste gia
tis politikes topikwn diadromwn sas''.

4.2.2. Kalwntas to java.cgi apo mia forma HTML

Oi formes moy poy xrhsimopoioun programmata Java CGI ka8orizoyn mia
energeia formas opws akolou8ws:

<form action="/cgi-bin/java.cgi/CGI_Test" method="POST">

Opoy /cgi-bin/ einai o topikos sas CGI binary katalogos, java.cgi
einai to Java front-end poy mas epitrepei na trexoyme programmata Java
ston isto kai to CGI_Test einai ena paradeigma onomatos programmatos
Java gia na trejete.

5. Xrhsimopoiwntas tis Java CGI Klaseis

Yparxoyn pros to paron treis kuries klaseis poy yposthrizontai --
``CGI'', ``Email'' kai ``HTML''. Skeftomai na pros8esw klaseis gia na
antimetwpisw ta MIME-diamorfwmena eisagomena (input) kai ejagomena
(output) -- MIMEin & MIMEout, antistoixa.

Yparxoyn epishs merikes support kai test klaseis. ``CGI_Test'',
``Email_Test'' kai ``HTML_Test'' skopeuoyn na xrhsimopoih8oun gia na
elegjoyn thn egkatastash sas. Mporoun epishs na xrhsimopoih8oun san
ena shmeio-ekkinhshs gia ta dika sas programmata Java poy
xrhsimopoioun ayth th biblio8hkh klasewn. H ``Text'' klash einai h
yperklash kai gia tis duo klaseis, thn Email kai thn HTML.

5.1. CGI

5.1.1. Suntajh klashs

public class CGI

5.1.2. Perigrafh klashs

H CGI klash krataei tis ``CGI Plhrofories'' -- Metablhtes
periballontos apo ton diakomisth istou kai to onoma/timh poy
stelnontai apo mia forma otan h submit energeia einai epilegmenh.
Oles oi plhrofories apo8hkeuontai se ena Properties antikeimeno
klashs.

Ayth h klash einai sto paketo ``Orbits.net''.

5.1.3. Perilhch melwn

CGI() // Kataskeyasths.

getNames() // Pairnei th lista onomatwn.

getValue() // Pairnei thn timh formas kata prosdiorismeno onoma.

5.1.4. Deite epishs

CGI_Test.

5.1.5. CGI()

Purpose
Kataskeyazei ena antikeimeno poy periexei ta dia8esima CGI
dedomena.

Syntax
public CGI()

Description
Otan kataskeyazetai ena antikeimeno CGI, oles oi dia8esimes CGI
plhrofories anarrofountai se apo8hkh topika sto neo antikeimeno.

5.1.6. getNames()

Purpose
Kanei lista twn onomatwn poy einai orismenes gia na exoyn
antistoixes times.

Syntax
public Enumeration getKeys ()

Description
Parexei thn plhrh lista twn onomatwn gia ta opoia antistoixes
times einai orismenes.

Returns
Mia Enumeration olwn twn orismenwn onomatwn.

5.1.7. getValue()

Purpose
Epanakta thn value sysxetismenh me to name poy exei oristei.

Syntax
public String getValue ( String name )

Description
Ayth h me8odos parexei th antistoixia metaju twn names kai
values poy stelnontai apo mia HTML forma.

Parametros

name
To kleidi kata to opoio oi times epilegontai.

Returns
Ena String poy perilambanei thn timh.

5.2. CGI_Test

Ayth h klash parexei ena paradeigma toy pws na xrhsimopoieite thn
klash CGI kai ena programma elegxoy poy mporei na xrhsimopoih8ei gia
na epibebaiwsei oti to paketo Java CGI leitoyrgei swsta.

5.2.1. Perilhch melwn

main() // Programma main().

5.2.2. Deite epishs

CGI.

5.2.3. main()

Purpose
Parexei mia main() me8odo.

Syntax
public static void main( String argv[] )

Description
Ayto einai to shmeio kataxwrhshs gia ena programma CGI poy den
kanei tipota allo apo to na anaferei mia lista me ola ta
dia8esima onoma/timh zeygaria kai tis trexoyses times toys.

Parametros

argv[]
Epixeirhmata perasmena sto programma apo to java.cgi script.
Pros to paron axrhsimopoihth.

5.3. Email

5.3.1. Suntajh Klashs

public class Email extends Text

5.3.2. Perigrafh klashs

Mhnumata sxhmatizontai me thn Text klash add*() me8odoys kai tis e-
mail-sygkekrimenes me8odoys poy prosti8entai apo aythn thn klash.
Otan oloklhrw8ei, to mhnyma stelnetai ston proorismo toy.

Ayth h klash einai sto paketo ``Orbits.net''.

5.3.3. Perilhch melwn

Email() // Kataskeyasths.

send() // Stelnei to e-mail mhnyma.

sendTo() // Pros8etei enan proorismo gia to mhnyma.

subject() // Ry8mizei to 8ema: gia to mhnyma.

5.3.4. Deite epishs

Email_Test, Text.

5.3.5. Email()

Purpose
Kataskeyazei ena antikeimeno to opoio 8a periexei ena email
mhnyma.

Syntax
public Email()

Description
Ry8mizei ena keno mhnyma gia na oloklhrw8ei apo tis Email
me8odoys.

See Also
Text.

5.3.6. send()

Purpose
Stelnei to e-mail mhnyma.

Syntax
public void send ()

Description
Ayth diamorfwnei kai stelnei to mhnyma. An kamia dieu8ynsh
proorismou den exei ry8mistei, de lambanetai kamia energeia.

5.3.7. sendTo()

Purpose
Pros8etei enan proorismo gia ayto to mhnyma.

Syntax
public String sendTo ( String address )

Description
Pros8etei thn address sth lista proorismwn gia

aythn thn me8odo. Den yparxei kanena orio ru8mishs ston ari8mo
proorismwn poy ena e-mail mhnyma mporei na exei. Eimai sigoyros
pws an sxhmatisete th lista arketa megalh, mporeite na yperbei
te to mege8os ths listas parametrwn poy o Mail Transport Agent
mporei na apodex8ei h na katanalwsete th mnhmh sas.

Parameter/

address
Enas proorismos gia na steilete ayto to mhnyma.

5.3.8. subject()

Purpose
Stelnei to 8ema gia ayto to mhnyma.

Syntax
public void subject ( String subject )

Description
Ayth h me8odos ry8mizei to keimeno gia thn grammh Subject: toy
e-mail. An klh8ei perissoteres apo mia fores, to teleytaio
ry8mismeno 8ema einai ayto poy xrhsimopoieitai.

Parameter

subject
To keimeno ths Subject: grammhs aytou toy mhnumatos.

5.4. Email_Test

Ayth h klash parexei ena paradeigma toy pws na xrhsimopoieite thn
Email klash kai ena test programma poy mporei na xrhsimopoih8ei gia na
epibebaiwsei oti to Java CGI paketo leitoyrgei swsta.

5.4.1. Perilhch melwn

main() // Programma main().

5.4.2. Deite epishs

Email.

5.4.3. main()

Purpose
Parexei mia main() me8odo.

Syntax
public static void main( String argv[] )

Description
Ayto einai to shmeio kataxwrhshs gia ena programma CGI poy
anaferei mia lista me ola ta dia8esima onoma/timh zeygaria kai
tis trexoyses times toys. Epishs, 8a steilei ayth th lista sthn
ka8orismenh dieu8ynsh sthn Email metablhth.

Parametros

argv[]
Epixeirhmata perniountai sto programma apo to java.cgi
senario. Pros to paron axrhsimopoihta.

5.5. HTML

5.5.1. Suntajh klashs

public class HTML extends Text

5.5.2. Perigrafh klashs

Mhnumata sxhmatizontai me thn Text klash add*() me8odoys kai tis HTML-
sygkekrimenes me8odoys poy prosti8entai apo aythn thn klash. Otan
oloklhrw8ei, to mhnyma stelnetai ston proorismo toy.

Pros to paron, den yparxei elegxos sfalmatwn gia na epibebaiwsei oti
oi me8odoi dhmioyrgias-listas xrhsimopoiountai se mia swsth seira,
opote o programmatisths prepei na pairnei metra gia na mhn parabiasei
thn HTML suntajh.

Ayth h klash einai sto paketo ``Orbits.net''.

5.5.3. Perilhch melwn

HTML() // Kataskeyasths.

author() // Ry8mizei to onoma toy syggrafea toy
eggrafoy.

definitionList() // 3ekina mia lista orismwn.

definitionListTerm() // Pros8etei enan oro sth lista orismwn.

endList() // Teleiwnei mia lista.

listItem() // Pros8etei mia kataxwrish se mia lista.

send() // Stelnei to HTML mhnyma.

title() // Ry8mizei to keimeno gia ton titlo toy
eggrafoy.

5.5.4. Deite epishs

HTML_Test, Text.

5.5.5. HTML()

Purpose
Dhmioyrgei ena antikeimeno poy 8a periexei ena HTML mhnyma.

Syntax
public HTML()

Description
Ry8mizei ena keno mhnyma na symplhrw8ei apo tis HTML me8odoys.

See Also
Text.

5.5.6. author()

Purpose
Ry8mizei to onoma toy syggrafea toy eggrafoy.

Syntax
public void author ( String author )

Description
Ry8mizei to onoma toy syggrafea toy eggrafoy se author.

Parameter/

author
To keimeno poy prepei na xrhsimopoih8ei san o syggrafeas
aytou toy mhnumatos.

See Also
title().

5.5.7. definitionList()

Purpose
Arxizei mia lista orismwn.

Syntax
public void definitionList ()

Description
Arxizei mia lista orismwn. H definition list einai mia lista
eidikeymenh etsi wste ka8e kataxwrish sth lista einai enas term
akoloy8oumenos apo to text orismwn gia ayton ton oro. H arxh
mias listas orismwn 8a prepei na akoloy8eitai apo toylaxiston)
ena oros/keimeno zeygari kai mia klhsh sthn endList() me8odo.
Shmeiwste pws, pros to paron, oi listes den mporoun na einai
fwliasmenes (nested) h mia mesa sthn allh.

See Also
definitionListTerm(), endList(), listItem().

5.5.8. definitionListTerm()

Purpose
Pros8etei enan oro sth lista orismwn.

Syntax
public void definitionListTerm ()

Description
Pros8etei enan oro sth lista orismwn. To keimeno gia to kommati
toy oroy ths trexoysas kataxwrhshs listas 8a prepei na
episynaptetai sto mhnyma afou h me8odos aytou kaleitai kai prin
mia antistoixh listItem me8odos kaleitai.

See Also
definitionList(), listItem().

5.5.9. endList()

Purpose
Teleiwnei mia lista.

Syntax
public void endList ()

Description
Teleiwnei mia lista.

Ayth h me8odos kleinei mia lista. Shmeiwste oti, pros to paron,
oi listes den mporoun na einai fwliasmenes (nested), h mia mesa
sthn allh.

See Also
definitionList().

5.5.10. listItem()

Purpose
Pros8etei mia kataxwrhsh se mia lista.

Syntax
public void listItem ()

public void listItem ( String item )

public boolean listItem ( String term, String item )

Description
Pros8etei mia kataxwrhsh se mia lista.

An h prwth forma xrhsimopoieitai, to keimeno gia thn trexwn
antikeimeno listas 8a prepei na episynaptetai sto mhnyma afou h
me8odos ayth kaleitai kai prin alles me8odoi listas kalountai.
Sthn deuterh kai trith forma, to item keimeno prosdiorizetai san
mia parametros sth me8odo anti na (h epipros8etws sto na)
episynaptetai sto mhnyma. H trith forma einai eidikh stis
listes orismwn kai parexei kai ton oro kai toy orismo ths
kataxwrhshs listas.

Parameters

item
To keimeno ayths ths kataxwrhshs listas.

term
To keimeno ayths ths listas orismwn toy kommatiou toy oroy
kataxwrhshs.

See Also
definitionList(), definitionListTerm(), endList().

5.5.11. send()

Purpose
Stelnei to HTML mhnyma.

Syntax
public void send ()

Description
Stelnei to HTML mhnyma.

5.5.12. title()

Purpose
Ry8mizei to keimeno gia ton titlo eggrafoy.

Syntax
public void title ( String title )

Description
Ry8mizei to keimeno gia ton titlo eggrafoy.

Parameter

title
To keimeno aytou toy titloy toy mhnumatos.

See Also
author().

5.6. HTML_Test

Ayth h klash parexei ena paradeigma toy pws na xrhsimopoieite thn HTML
klash kai ena test programma poy mporei na xrhsimopoih8ei gia na
epibebaiwsei oti to paketo Java CGI leitoyrgei swsta.

5.6.1. Perilhch melwn

main() // Programma main().

5.6.2. Deite epishs

HTML.

5.6.3. main()

Purpose
Parexei mia main() me8odo.

Syntax
public static void main( String argv[] )

Description
Ayto einai to shmeio kataxwrhshs gia ena programma CGI poy
epistrefei mia lista twn dia8esimwn onoma/timh zeygariwn se ena
HTML eggrafo, me to ka8e onoma/timh zeygari na apeikonizetai se
ena stoixeio listas orismwn.

Parametros

argv[]
Epixeirhmata perasmena sto programma apo to java.cgi senario.
Pros to paron de xrhsimopoiountai.

5.7. Text

5.7.1. Suntajh klashs

public abstract class Text

5.7.2. Perigrafh klashs

H klash einai h yperklash twn Email kai HTML klasewn. Mhnumata
xtizontai me tis me8odoys se aythn thn klash kai symplhrwnetai kai
diamorfwnetai me tis me8odoys se ypoklaseis.

Ayth h klash einai sto paketo ``Orbits.text''.

5.7.3. Perilhch melwn

Text() // Kataskeyasths.

add() // Pros8etei keimeno se ayto to antikeimeno.

addLineBreak() // Pros8etei mia diakoph grammhs.

addParagraph() // Pros8etei mia diakoph paragrafoy.

5.7.4. Deite epishs

Email, HTML.

5.7.5. add()

Purpose
Pros8etei keimeno se ayto to antikeimeno.

Syntax
public void add ( char addition )

public void add ( String addition )

public void add ( StringBuffer addition )

Description
Pros8etei addition sta periexomena aytou toy antikeimenoy
keimenoy.

Parameter

addition
Keimeno poy prepei na proste8ei sto antikeimeno keimenoy

See Also
addLineBreak(), addParagraph().

5.7.6. addLineBreak()

Purpose
Anagkazei mia diakoph grammhs se ayto to shmeio sto keimeno.

Syntax
public void addLineBreak ()

Description
Pros8etei mia diakoph grammhs sto keimeno sto trexon shmeio.

See Also
add(), addParagraph().

5.7.7. addParagraph()

Purpose
Arxizei mia nea paragrafo.

Syntax
public void add ()

Description
Arxizei mia nea paragrafo se ayto to shmeio sth roh keimenoy.

See Also
add(), addLineBreak().

6. Mellontika Sxedia

� Pros8hkh sthn Email klash:

Email( int capacity )
Xrhsimopoieitai otan gnwrizoyme poso xwro to mhnyma 8a xreiastei
na exei paraxwrhmeno.

sendTo( String [] address )
Pros8etei mia lista prwtarxikwn proorismwn sto e-mail mhnyma.

sendCc( String address )
Pros8etei ena Carbon-Copy proorismo sto e-mail mhnyma.

sendCc( String [] address )
Pros8etei mia lista apo Carbon-Copy proorismous sto e-mail
mhnyma.

sendBcc( String address )
Pros8etei ena Blind Carbon-Copy proorismo sto e-mail mhnyma.

sendBcc( String [] address )
Pros8etei mia lista apo Blind Carbon-Copy proorismous sto e-mail
mhnyma.

� Pros8hkh sthn HTML klash:

HTML( int capacity )
Xrhsimopoieitai otan gnwrizoyme poso xwro to mhnyma

8a xreiastei na exei paraxwrhmeno.

public void unorderedList()
Arxizei mia mh tajinomhmenh lista.

public void orderedList()
Arxizei mia tajinomhmenh lista.

public void directoryList()
Arxizei mia lista katalogwn.

public void menuList()
Arxizei mia lista menou.

void anchor( String anchorName )
Prosdiorizei ena anchor.

void link( String url, String text )
Prosdiorizei enan desmo.

void applet( String url, String altText )
Prosdiorizei enan desmo applet.

� Epitrepei fwliasmenes (nested) HTML listes.

� Pros8hkh kwdika elegxoy sfalmatwn gia na epiballei swsth tajinomhsh
ths HTML listas kwdikwn diamorfwshs.

� H topo8esia toy arxeioy twn dedomenwn periballontos 8a prepei na
einai diamorfwsimo apo to Makefile.

� Apallagh apo to ceutika adeio onoma/timh zeygari poy emfanizetai
mesa sth lista otan antimetwpizoyme thn GET me8odo ths metaforas
dedomenwn.

� Skech gia na exoyme to CGI na ektelei thn java.util.Enumeration
epifaneia gia na parexei epityxws onomata metablhtwn.

� Pros8hkh mias Test klashs, poy 8a xrhsimopoiouse ka8e me8odo se
ayto to paketo.

� Tekmhriwsh pws oi CGI_Test, Email_Test kai HTML_Test xtisthkan h
mia panw sthn allh gia na parexoyn ayjanomenoys elegxoys gia
skopous eksfalmatwshs.

� Tekmhriwsh pws h Test xrhsimopoiei ka8e xarakthristiko dia8esimo se
ayto to paketo.

7. Allages

7.1. Allages apo thn 0.4 sthn 0.5

� Allaxthke h tekmhriwsh kai ta sxolia gia na antikatoptrizetai h
telikh fush ayths ths kykloforias.

7.2. Allages apo thn 0.3 sthn 0.4

� Ensarkw8hke h HTML klash gia na parexei elaxisth leitoyrgikothta.

� Grafthke h HTML_Test klash kai to javahtmltest.html-dist.

� Proste8hkan oi HTML me8odoi gia na antimetwpistei mia lista
orismwn.

7.3. Allages apo thn 0.2 sthn 0.3

� Proste8hkan oi Text kai Email klaseis. H HTML epishs proste8hke,
alla htan mono ena apokomma se ayto to shmeio.

� Topo8eth8hkan oi diafores klaseis se paketa. Oi kuries klaseis
einai sto Orbits.net.*, h klash yposthrijhs Text einai sto
Orbits.text.Text.

� Allaxthke to CGItest se CGI_Test.

� Proste8hke h Email_Test klash.

7.4. Allages apo thn 0.1 sthn 0.2

� Oi metablhtes periballontos topo8etountai se ena proswrino arxeio
anti na einai stoibagmenes sth grammh-entolwn toy Java diermhnea .
H CGI klash kai to java.cgi eprepe na tropopoih8oun.

� To javacgitest.html eggrafo ginetai meros ths dianomhs.

� Ta arxeia keimenoy poy tropopoiountai apo thn make kata thn
egkatastash parexontai me onomata poy teleiwnoyn se -dist.