JAVA网页编程之TomCat 多假造站点设置

还是要自己一点一点写代码，然后编译，改错再编译好那。还有最重要的是.net的编译环境非常好，你甚是不需要了解太多工具，对于简单的系统，你可以之了解一些语法就哦了。站点　　在收集上找了好久，没有一个真正能够办理TomCat多假造站点的设置成绩的，经由实验和参考官方网站材料，终究办理了这个成绩．
　　参考材料：ApacheTomcat文档http://tomcat.apache.org/tomcat-5.0-doc/config/host.html

　　在文中有这么一段话：
　　OneormoreHostelementsarenestedinsideanEngineelement.InsidetheHostelement,youcannestContextelementsforthewebapplicationsassociatedwiththisvirtualhost.ExactlyoneoftheHostsassociatedwitheachEngineMUSThaveanamematchingthedefaultHostattributeofthatEngine.

　　译文：Engine元素中必要一个或多个Host元素，在Host元素内里，你必须有Context元素让网站使用程序与假造主机毗连上，周密地说,每个主机所联系关系的引擎必需有一个名字跟谁人引擎默许的主机属性婚配．
　　可知，在Engine元素内里能够有多个Host，那末说，能够有在一个Engine内里设置多个服务器了，这恰是我们必要的．每一个Host元素内里要有一个Context元素．
　　依据confserver.xml内里的申明和典范，我样能够编写出上面一个设置文件：

1<!--ExampleServerConfigurationFile-->
2<!--Notethatcomponentelementsarenestedcorrespondingtotheir
3parent-childrelationshipswitheachother-->
4
5<!--A"Server"isasingletonelementthatrepresentstheentireJVM,
6whichmaycontainoneormore"Service"instances.TheServer
7listensforashutdowncommandontheindicatedport.
8
9Note:A"Server"isnotitselfa"Container",soyoumaynot
10definesubcomponentssuchas"Valves"or"Loggers"atthislevel.
11-->
12
13<Serverport="8005"shutdown="SHUTDOWN">
14
15<!--CommenttheseentriesouttodisableJMXMBeanssupportusedforthe
16administrationwebapplication-->
17<ListenerclassName="org.apache.catalina.core.AprLifecycleListener"/>
18<ListenerclassName="org.apache.catalina.mbeans.ServerLifecycleListener"/>
19<ListenerclassName="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
20<ListenerclassName="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/>
21
22<!--GlobalJNDIresources-->
23<GlobalNamingResources>
24
25<!--Testentryfordemonstrationpurposes-->
26<Environmentname="simpleValue"type="java.lang.Integer"value="30"/>
27
28<!--Editableuserdatabasethatcanalsobeusedby
29UserDatabaseRealmtoauthenticateusers-->
30<Resourcename="UserDatabase"auth="Container"
31type="org.apache.catalina.UserDatabase"
32description="Userdatabasethatcanbeupdatedandsaved"
33factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
34pathname="conf/tomcat-users.xml"/>
35
36</GlobalNamingResources>
37
38<!--A"Service"isacollectionofoneormore"Connectors"thatshare
39asingle"Container"(andthereforethewebapplicationsvisible
40withinthatContainer).Normally,thatContainerisan"Engine",
41butthisisnotrequired.
42
43Note:A"Service"isnotitselfa"Container",soyoumaynot
44definesubcomponentssuchas"Valves"or"Loggers"atthislevel.
45-->
46
47<!--DefinetheTomcatStand-AloneService-->
48<Servicename="Catalina">
49
50<!--A"Connector"representsanendpointbywhichrequestsarereceived
51andresponsesarereturned.EachConnectorpassesrequestsontothe
52associated"Container"(normallyanEngine)forprocessing.
53
54Bydefault,anon-SSLHTTP/1.1Connectorisestablishedonport8080.
55YoucanalsoenableanSSLHTTP/1.1Connectoronport8443by
56followingtheinstructionsbelowanduncommentingthesecondConnector
57entry.SSLsupportrequiresthefollowingsteps(seetheSSLConfig
58HOWTOintheTomcat5documentationbundleformoredetailed
59instructions):
60*IfyourJDKversion1.3orprior,downloadandinstallJSSE1.0.2or
61later,andputtheJARfilesinto"$JAVA_HOME/jre/lib/ext".
62*Execute:
63%JAVA_HOME%inkeytool-genkey-aliastomcat-keyalgRSA(Windows)
64$JAVA_HOME/bin/keytool-genkey-aliastomcat-keyalgRSA(Unix)
65withapasswordvalueof"changeit"forboththecertificateand
66thekeystoreitself.
67
68Bydefault,DNSlookupsareenabledwhenawebapplicationcalls
69request.getRemoteHost().Thiscanhaveanadverseimpacton
70performance,soyoucandisableitbysettingthe
71"enableLookups"attributeto"false".WhenDNSlookupsaredisabled,
72request.getRemoteHost()willreturntheStringversionofthe
73IPaddressoftheremoteclient.
74-->
75
76<!--Defineanon-SSLHTTP/1.1Connectoronport8080-->
77<Connector
78port="80"maxHttpHeaderSize="8192"
79maxThreads="150"minSpareThreads="25"maxSpareThreads="75"
80enableLookups="false"redirectPort="8443"acceptCount="100"
81connectionTimeout="20000"disableUploadTimeout="true"URIEncoding="GB2312"/>
82<!--Note:Todisableconnectiontimeouts,setconnectionTimeoutvalue
83to0-->
84
85<!--Note:Tousegzipcompressionyoucouldsetthefollowingproperties:
86
87compression="on"
88compressionMinSize="2048"
89noCompressionUserAgents="gozilla,traviata"
90compressableMimeType="text/html,text/xml"
91-->
92
93<!--DefineaSSLHTTP/1.1Connectoronport8443-->
94<!--
95<Connectorport="8443"maxHttpHeaderSize="8192"
96maxThreads="150"minSpareThreads="25"maxSpareThreads="75"
97enableLookups="false"disableUploadTimeout="true"
98acceptCount="100"scheme="https"secure="true"
99clientAuth="false"sslProtocol="TLS"/>
100-->
101
102<!--DefineanAJP1.3Connectoronport8009-->
103<Connectorport="8009"
104enableLookups="false"redirectPort="8443"protocol="AJP/1.3"/>
105
106<!--DefineaProxiedHTTP/1.1Connectoronport8082-->
107<!--Seeproxydocumentationformoreinformationaboutusingthis.-->
108<!--
109<Connectorport="8082"
110maxThreads="150"minSpareThreads="25"maxSpareThreads="75"
111enableLookups="false"acceptCount="100"connectionTimeout="20000"
112proxyPort="80"disableUploadTimeout="true"/>
113-->
114
115<!--AnEnginerepresentstheentrypoint(withinCatalina)thatprocesses
116everyrequest.TheEngineimplementationforTomcatstandalone
117analyzestheHTTPheadersincludedwiththerequest,andpassesthem
118ontotheappropriateHost(virtualhost).-->
119
120<!--YoushouldsetjvmRoutetosupportload-balancingviaAJPie:
121<Enginename="Standalone"defaultHost="localhost"jvmRoute="jvm1">
122-->
123
124<!--Definethetoplevelcontainerinourcontainerhierarchy-->
125<Enginename="Catalina"defaultHost="ycoe.vicp.net">
126
127<!--Therequestdumpervalvedumpsusefuldebugginginformationabout
128therequestheadersandcookiesthatwerereceived,andtheresponse
129headersandcookiesthatweresent,forallrequestsreceivedby
130thisinstanceofTomcat.Ifyoucareonlyaboutrequeststoa
131particularvirtualhost,oraparticularapplication,nestthis
132elementinsidethecorresponding<Host>or<Context>entryinstead.
133
134ForasimilarmechanismthatisportabletoallServlet2.4
135containers,checkoutthe"RequestDumperFilter"Filterinthe
136exampleapplication(thesourceforthisfiltermaybefoundin
137"$CATALINA_HOME/webapps/examples/WEB-INF/classes/filters").
138
139Requestdumpingisdisabledbydefault.Uncommentthefollowing
140elementtoenableit.-->
141<!--
142<ValveclassName="org.apache.catalina.valves.RequestDumperValve"/>
143-->
144
145<!--BecausethisRealmishere,aninstancewillbesharedglobally-->
146
147<!--ThisRealmusestheUserDatabaseconfiguredintheglobalJNDI
148resourcesunderthekey"UserDatabase".Anyedits
149thatareperformedagainstthisUserDatabaseareimmediately
150availableforusebytheRealm.-->
151<RealmclassName="org.apache.catalina.realm.UserDatabaseRealm"
152resourceName="UserDatabase"/>
153
154<!--Commentouttheoldrealmbutleaveherefornowincasewe
155needtogobackquickly-->
156<!--
157<RealmclassName="org.apache.catalina.realm.MemoryRealm"/>
158-->
159
160<!--ReplacetheaboveRealmwithoneofthefollowingtogetaRealm
161storedinadatabaseandaccessedviaJDBC-->
162
163<!--
164<RealmclassName="org.apache.catalina.realm.JDBCRealm"
165driverName="org.gjt.mm.mysql.Driver"
166connectionURL="jdbc:mysql://localhost/authority"
167connectionName="test"connectionPassword="test"
168userTable="users"userNameCol="user_name"userCredCol="user_pass"
169userRoleTable="user_roles"roleNameCol="role_name"/>
170-->
171
172<!--
173<RealmclassName="org.apache.catalina.realm.JDBCRealm"
174driverName="oracle.jdbc.driver.OracleDriver"
175connectionURL="jdbc:oracle:thin:@ntserver:1521:ORCL"
176connectionName="scott"connectionPassword="tiger"
177userTable="users"userNameCol="user_name"userCredCol="user_pass"
178userRoleTable="user_roles"roleNameCol="role_name"/>
179-->
180
181<!--
182<RealmclassName="org.apache.catalina.realm.JDBCRealm"
183driverName="sun.jdbc.odbc.JdbcOdbcDriver"
184connectionURL="jdbc:odbc:CATALINA"
185userTable="users"userNameCol="user_name"userCredCol="user_pass"
186userRoleTable="user_roles"roleNameCol="role_name"/>
187-->
188
189<!--Definethedefaultvirtualhost
190Note:XMLSchemavalidationwillnotworkwithXerces2.2.
191-->
192<Hostname="ycoe.vicp.net"appBase="webapps"
193unpackWARs="true"autoDeploy="true"
194xmlValidation="false"xmlNamespaceAware="false">
195
196<!--Definesaclusterforthisnode,
197Bydefiningthiselement,meansthateverymanagerwillbechanged.
198Sowhenrunningacluster,onlymakesurethatyouhavewebappsinthere
199thatneedtobeclusteredandremovetheotherones.
200Aclusterhasthefollowingparameters:
201
202className=thefullyqualifiednameoftheclusterclass
203
204name=adescriptivenameforyourcluster,canbeanything
205
206mcastAddr=themulticastaddress,hastobethesameforallthenodes
207
208mcastPort=themulticastport,hastobethesameforallthenodes
209
210mcastBindAddr=bindthemulticastsockettoaspecificaddress
211
212mcastTTL=themulticastTTLifyouwanttolimityourbroadcast
213
214mcastSoTimeout=themulticastreadtimeout
215
216mcastFrequency=thenumberofmillisecondsinbetweensendinga"Imalive"heartbeat
217
218mcastDropTime=thenumberamillisecondsbeforeanodeisconsidered"dead"ifnoheartbeatisreceived
219
220tcpThreadCount=thenumberofthreadstohandleincomingreplicationrequests,optimalwouldbethesame
amountofthreadsasnodes
221
222tcpListenAddress=thelistenaddress(bindaddress)forTCPclusterrequestonthishost,
223incaseofmultipleethernetcards.
224automeansthataddressbecomes
225InetAddress.getLocalHost().getHostAddress()
226
227tcpListenPort=thetcplistenport
228
229tcpSelectorTimeout=thetimeout(ms)fortheSelector.select()methodincasetheOS
230hasawakupbuginjava.nio.Setto0fornotimeout
231
232printToScreen=truemeansthatmanagerswillalsoprinttostd.out
233
234expireSessionsOnShutdown=truemeansthat
235
236useDirtyFlag=truemeansthatweonlyreplicateasessionaftersetAttribute,removeAttributehasbeencalled.
237falsemeanstoreplicatethesessionaftereachrequest.
238falsemeansthatreplicationwouldworkforthefollowingpieceofcode:(onlyforSimpleTcpReplicationManager)
239<%
240HashMapmap=(HashMap)session.getAttribute("map");
241map.put("key","value");
242%>
243replicationMode=canbeeitherpooled,synchronousorasynchronous.
244*Pooledmeansthatthereplicationhappensusingseveralsocketsinasynchronousway.Ie,
thedatagetsreplicated,thentherequestreturn.Thisisthesameasthesynchronoussettingexceptitusesapoolofsockets,
henceitismultithreaded.Thisisthefastestandsafestconfiguration.Tousethis,alsoincreasethenroftcpthreads
thatyouhavedealingwithreplication.
245*Synchronousmeansthatthethreadthatexecutestherequest,isalsothe
246threadthereplicatesthedatatotheothernodes,andwillnotreturnuntilall
247nodeshavereceivedtheinformation.
248*Asynchronousmeansthatthereisaspecificsenderthreadforeachclusternode,
249sotherequestthreadwillqueuethereplicationrequestintoa"smart"queue,
250andthenreturntotheclient.
251The"smart"queueisaqueuewherewhenasessionisaddedtothequeue,andthesamesession
252alreadyexistsinthequeuefromapreviousrequest,thatsessionwillbereplaced
253inthequeueinsteadofreplicatingtworequests.Thisalmostneverhappens,unlessthereisa
254largenetworkdelay.
255-->
256<!--
257Whenconfiguringforclustering,youalsoaddinavalvetocatchalltherequests
258comingin,attheendoftherequest,thesessionmayormaynotbereplicated.
259Asessionisreplicatedifandonlyifalltheconditionsaremet:
2601.useDirtyFlagistrueorsetAttributeorremoveAttributehasbeencalledAND
2612.asessionexists(hasbeencreated)
2623.therequestisnottrappedbythe"filter"attribute
263
264Thefilterattributeistofilteroutrequeststhatcouldnotmodifythesession,
265hencewedontreplicatethesessionaftertheendofthisrequest.
266Thefilterisnegative,ie,anythingyouputinthefilter,youmeantofilterout,
267ie,noreplicationwillbedoneonrequeststhatmatchoneofthefilters.
268Thefilterattributeisdelimitedby;,soyoucantescapeout;evenifyouwantedto.
269
270filter=".*.gif;.*.js;"meansthatwewillnotreplicatethesessionafterrequestswiththeURI
271endingwith.gifand.jsareintercepted.
272
273Thedeployerelementcanbeusedtodeployappsclusterwide.
274Currentlythedeploymentonlydeploys/undeploystoworkingmembersinthecluster
275sonoWARsarecopieduponsstartupofabrokennode.
276Thedeployerwatchesadirectory(watchDir)forWARfileswhenwatchEnabled="true"
277Whenanewwarfileisaddedthewargetsdeployedtothelocalinstance,
278andthendeployedtotheotherinstancesinthecluster.
279WhenawarfileisdeletedfromthewatchDirthewarisundeployedlocally
280andclusterwide
281-->
282
283<!--
284<ClusterclassName="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
285managerClassName="org.apache.catalina.cluster.session.DeltaManager"
286expireSessionsOnShutdown="false"
287useDirtyFlag="true"
288notifyListenersOnReplication="true">
289
290<Membership
291className="org.apache.catalina.cluster.mcast.McastService"
292mcastAddr="228.0.0.4"
293mcastPort="45564"
294mcastFrequency="500"
295mcastDropTime="3000"/>
296
297<Receiver
298className="org.apache.catalina.cluster.tcp.ReplicationListener"
299tcpListenAddress="auto"
300tcpListenPort="4001"
301tcpSelectorTimeout="100"
302tcpThreadCount="6"/>
303
304<Sender
305className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
306replicationMode="pooled"
307ackTimeout="15000"/>
308
309<ValveclassName="org.apache.catalina.cluster.tcp.ReplicationValve"
310filter=".*.gif;.*.js;.*.jpg;.*.htm;.*.html;.*.txt;"/>
311
312<DeployerclassName="org.apache.catalina.cluster.deploy.FarmWarDeployer"
313tempDir="/tmp/war-temp/"
314deployDir="/tmp/war-deploy/"
315watchDir="/tmp/war-listen/"
316watchEnabled="false"/>
317</Cluster>
318-->
319
320
321
322<!--Normally,usersmustauthenticatethemselvestoeachwebapp
323individually.Uncommentthefollowingentryifyouwouldlike
324ausertobeauthenticatedthefirsttimetheyencountera
325resourceprotectedbyasecurityconstraint,andthenhavethat
326useridentitymaintainedacross*all*webapplicationscontained
327inthisvirtualhost.-->
328<!--
329<ValveclassName="org.apache.catalina.authenticator.SingleSignOn"/>
330-->
331
332<!--Accesslogprocessesallrequestsforthisvirtualhost.By
333default,logfilesarecreatedinthe"logs"directoryrelativeto
334$CATALINA_HOME.Ifyouwish,youcanspecifyadifferent
335directorywiththe"directory"attribute.Specifyeitherarelative
336(to$CATALINA_HOME)orabsolutepathtothedesireddirectory.
337-->
338<!--
339<ValveclassName="org.apache.catalina.valves.AccessLogValve"
340directory="logs"prefix="localhost_access_log."suffix=".txt"
341pattern="common"resolveHosts="false"/>
342-->
343
344<!--Accesslogprocessesallrequestsforthisvirtualhost.By
345default,logfilesarecreatedinthe"logs"directoryrelativeto
346$CATALINA_HOME.Ifyouwish,youcanspecifyadifferent
347directorywiththe"directory"attribute.Specifyeitherarelative
348(to$CATALINA_HOME)orabsolutepathtothedesireddirectory.
349Thisaccesslogimplementationisoptimizedformaximumperformance,
350butishardcodedtosupportonlythe"common"and"combined"patterns.
351-->
352<!--
353<ValveclassName="org.apache.catalina.valves.FastCommonAccessLogValve"
354directory="logs"prefix="localhost_access_log."suffix=".txt"
355pattern="common"resolveHosts="false"/>
356-->
357<ContextdocBase="D:WORKSEShopEWebShop"path="/"reloadable="true"
workDir="D:WORKSEShopTomcatworkEWebShop">
358</Context>
359</Host>
360<Hostname="yvor.vicp.net"appBase="webapps"unpackWARs="true"autoDeploy="true"xmlValidation="false"
xmlNamespaceAware="false">
361<ContextdocBase="D:WORKSYCOEycoe"path="/"reloadable="true"workDir="D:WORKSYCOETomcatworkycoe">
362</Context>
363</Host>
364</Engine>
365</Service>
366</Server>
367
368
　　能够看到，这里修正了
　　81行修正了两个参数值：<Connectorport="80"maxHttpHeaderSize="8192"
maxThreads="150"minSpareThreads="25"maxSpareThreads="75"
enableLookups="false"redirectPort="8443"acceptCount="100"
connectionTimeout="20000"disableUploadTimeout="true"URIEncoding="GB2312"/>
　　修正port是修正Tomcat的服务端口，默许为8080，URIEncoding改成GB2312是为了利用中文路径
　　　　但不倡议利用．

　　125行：<Enginename="Catalina"defaultHost="ycoe.vicp.net">

192行：<Hostname="ycoe.vicp.net"appBase="webapps"unpackWARs="true"autoDeploy="true"xmlValidation="false"xmlNamespaceAware="false">

　　然后再增加360行入手下手的<Host>元素：<Hostname="yvor.vicp.net"appBase="webapps"unpackWARs="true"autoDeploy="true"
xmlValidation="false"xmlNamespaceAware="false">
<ContextdocBase="D:WORKSYCOEycoe"path="/"reloadable="true"
workDir="D:WORKSYCOETomcatworkycoe"></Context>
</Host>
　　这里是设置我们的第二个假造网站的域名．
　　注：<Context/>内里的内容并非我们实践使用的，我们能够经由过程另外一种对照便利并且简单修正的体例来设置这些参数．上面我们来做这方面的设置：
　　１．在%CATALINA_HOME%confCatalina目次下创立ycoe.vicp.net和yvor.vicp.net两个文件夹．
　　２．在这两个文件夹内里创立ROOT.xml文件（要以ROOT.xml为称号，不然固然不会堕落，但不克不及用http://ycoe.vicp.net或http://yvor.vicp.net间接会见）
　　３．ROOT.xml的内容以下：
<?xmlversion=1.0encoding=utf-8?>
<ContextdocBase="D:WORKSEShopEWebShop"path="/"reloadable="true"
workDir="D:WORKSEShopTomcatworkEWebShop">
</Context>

　　依据本人的实践情形，设置这里的docBase和workDir的路径．docBase是申明文档的路径，workDir是网站程序的路径，假如用绝对路径，则是在%CATALINA_HOME%webapp目次下，path是会见的路径

　　参考官方文档：

AnyXMLfileinthe$CATALINA_HOME/conf/[engine_name]/[host_name]directoryisassumedtocontainaContextelement(anditsassociatedsubelements)forasinglewebapplication.ThedocBaseattributeofthis<Context>elementwilltypicallybetheabsolutepathnametoawebapplicationdirectory,ortheabsolutepathnameofawebapplicationarchive(WAR)file(whichwillnotbeexpanded).
Anywebapplicationarchivefilewithintheapplicationbase(appBase)directorythatdoesnothaveacorrespondingdirectoryofthesamename(withoutthe".war"extension)willbeautomaticallyexpanded,unlesstheunpackWARspropertyissettofalse.IfyouredeployanupdatedWARfile,besuretodeletetheexpandeddirectorywhenrestartingTomcat,sothattheupdatedWARfilewillbere-expanded(notethattheautodeployerwillautomaticallytakecareofthisifitisenabled).
Anysubdirectorywithintheapplicationbasedirectorythatappearstobeanunpackedwebapplication(thatis,itcontainsa/WEB-INF/web.xmlfile)willreceiveanautomaticallygeneratedContextelement,evenifthisdirectoryisnotmentionedintheconf/server.xmlfile.ThisgeneratedContextentrywillbeconfiguredaccordingtothepropertiessetinanyDefaultContextelementnestedinthisHostelement.ThecontextpathforthisdeployedContextwillbeaslashcharacter("/")followedbythedirectoryname,unlessthedirectorynameisROOT,inwhichcasethecontextpathwillbeanemptystring("").

　　你也能够在这两个目次下创立别的xml的文件

　　可是这时候你经由过程扫瞄器会见http://ycoe.vicp.net或http://yvor.vicp.net时其实不能扫瞄到你的网页，由于它把这些网址剖析到广域网上往了，除非你用域名绑定．
　　为了让局域本机不把这两个网址剖析到广域网上往．我们能够经由过程以下设置完成（WindowsXP，别的操纵体系没有试过）：
　１．用文本编纂器翻开C:WINDOWSsystem32driversetc目次的hosts文件
　２．在内容最初另起一行，增加以下内容：
127.0.0.1ycoe.vicp.net
127.0.0.1yvor.vicp.net

　　能够由下面的正文部分懂得它的感化：


#Copyright(c)1993-1999MicrosoftCorp.
#
#ThisisasampleHOSTSfileusedbyMicrosoftTCP/IPforWindows.
#
#ThisfilecontainsthemappingsofIPaddressestohostnames.Each
#entryshouldbekeptonanindividualline.TheIPaddressshould
#beplacedinthefirstcolumnfollowedbythecorrespondinghostname.
#TheIPaddressandthehostnameshouldbeseparatedbyatleastone
#space.
#
#Additionally,comments(suchasthese)maybeinsertedonindividual
#linesorfollowingthemachinenamedenotedbya#symbol.
#
#Forexample:
#
#102.54.94.97rhino.acme.com#sourceserver
#38.25.63.10x.acme.com#xclienthost
　　到这里，全体的设置已完成了．重启Tomcat,翻开http://ycoe.vicp.net或http://yvor.vicp.net就能够看到预期的效果了．呵呵
　　下载相干文件http://www.ckuyun.com/Files/ycoe/Catalina.rar
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你一定会高兴地说，哈哈，原来成为Java高手就这么简单啊!记得Tomjava也曾碰到过一个项目经理，号称Java很简单，只要三个月就可以学会。

你现在最缺的是实际的工作经验，而不是书本上那些凭空想出来的程序。

应用在电视机、电话、闹钟、烤面包机等家用电器的控制和通信。由于这些智能化家电的市场需求没有预期的高，Sun公司放弃了该项计划。随着1990年代互联网的发展

Java语言支持Internet应用的开发，在基本的Java应用编程接口中有一个网络应用编程接口（java net），它提供了用于网络应用编程的类库，包括URL、URLConnection、Socket、ServerSocket等。Java的RMI（远程方法激活）机制也是开发分布式应用的重要手段。

学Java必读的两个开源程序就是Jive和Pet Store.。 Jive是国外一个非常著名的BBS程序，完全开放源码。论坛的设计采用了很多先进的技术，如Cache、用户认证、Filter、XML等，而且论坛完全屏蔽了对数据库的访问，可以很轻易的在不同数据库中移植。论坛还有方便的安装和管理程序，这是我们平时编程时容易忽略的一部份（中国程序员一般只注重编程的技术含量，却完全不考虑用户的感受，这就是我们与国外软件的差距所在）。

是一种突破用户端机器环境和CPU

如果你学过HTML，那么事情要好办的多，如果没有，那你快去补一补HTML基础吧。其实JSP中的Java语法也不多，它更象一个脚本语言，有点象ASP。

是一种使用者不需花费很多时间学习的语言