在JXTA應(yīng)用中有對等組的概念,當(dāng)你加入了對等組之后.你在這個對等組內(nèi)發(fā)布的信息就只有這個組的成員才能收到,所謂的成員資格服務(wù)^_^.(差不多這個意思吧.不完全對.)
但是你不能建立你自己的應(yīng)用中所私有的組的話.那么別人通過搜索 * 匹配來得到你的組通告就可以加入你建立的對等組.如果在你告訴了我你自己的應(yīng)用中組的名字的話.我就可以自己寫一個應(yīng)用來加入你的組進(jìn)行任意的破壞.^_^.
那么不就很不安全了嗎?應(yīng)用的維護(hù)管理也太不方便了.
雖然我之前寫過哪個關(guān)于通過認(rèn)證加入對等組的文章,但是哪個就是不安全.
其實可以通過建立ModuleImplAdvertisement 來為你的對等組增加帳號密碼的認(rèn)證

代碼如下:

????private?ModuleImplAdvertisement?createPasswdMembershipPeerGroupModuleImplAdv(PeerGroup?rootPeerGroup)?{
????????ModuleImplAdvertisement?allPurposePeerGroupImplAdv=null;
????????try?{
????????????allPurposePeerGroupImplAdv=rootPeerGroup.getAllPurposePeerGroupImplAdvertisement();
????????}?catch?(java.lang.Exception?e)?{
????????????System.exit(1);
????????}
????????ModuleImplAdvertisement?passwdMembershipPeerGroupModuleImplAdv=allPurposePeerGroupImplAdv;
????????ModuleImplAdvertisement?passwdMembershipServiceModuleImplAdv=null;
????????StdPeerGroupParamAdv?passwdMembershipPeerGroupParamAdv=null;

????????try?{
????????????passwdMembershipPeerGroupParamAdv?=
????????????????new?StdPeerGroupParamAdv(allPurposePeerGroupImplAdv.getParam());
????????}?catch?(net.jxta.exception.PeerGroupException?e)?{
????????????System.exit(1);
????????}

????????Hashtable?allPurposePeerGroupServicesHashtable?=?passwdMembershipPeerGroupParamAdv.getServices();
????????Enumeration?allPurposePeerGroupServicesEnumeration?=?allPurposePeerGroupServicesHashtable.keys();
????????boolean?membershipServiceFound=false;
????????while?((!membershipServiceFound)?&&?(allPurposePeerGroupServicesEnumeration.hasMoreElements()))?{
????????????Object?allPurposePeerGroupServiceID?=?allPurposePeerGroupServicesEnumeration.nextElement();
????????????if?(allPurposePeerGroupServiceID.equals(PeerGroup.membershipClassID))?{
????????????????ModuleImplAdvertisement?allPurposePeerGroupMemershipServiceModuleImplAdv=?(ModuleImplAdvertisement)?allPurposePeerGroupServicesHashtable.get(allPurposePeerGroupServiceID);
????????????????passwdMembershipServiceModuleImplAdv=this.createPasswdMembershipServiceModuleImplAdv(allPurposePeerGroupMemershipServiceModuleImplAdv);
????????????????allPurposePeerGroupServicesHashtable.remove(allPurposePeerGroupServiceID);
????????????????allPurposePeerGroupServicesHashtable.put(PeerGroup.membershipClassID,passwdMembershipServiceModuleImplAdv);
????????????????membershipServiceFound=true;

????????????????passwdMembershipPeerGroupModuleImplAdv.setParam((Element)?passwdMembershipPeerGroupParamAdv.getDocument(new?MimeMediaType("text/xml")));

????????????????if?(!passwdMembershipPeerGroupModuleImplAdv.getModuleSpecID().equals(PeerGroup.allPurposePeerGroupSpecID))?{
????????????????????passwdMembershipPeerGroupModuleImplAdv.setModuleSpecID(IDFactory.newModuleSpecID(passwdMembershipPeerGroupModuleImplAdv.getModuleSpecID().getBaseClass()));
????????????????}?else?{
????????????????????ID?passwdGrpModSpecID=?ID.nullID;
????????????????????try?{
????????????????????????passwdGrpModSpecID?=?IDFactory.fromURL(new?URL("urn","","jxta:uuid-"+"DeadBeefDeafBabaFeedBabe00000001"?+"04"?+"06"?)?);
????????????????????}?catch?(java.net.MalformedURLException?e)?{}
????????????????????catch?(java.net.UnknownServiceException?ee)?{}
????????????????????passwdMembershipPeerGroupModuleImplAdv.setModuleSpecID((ModuleSpecID)?passwdGrpModSpecID);
????????????????}?
????????????????membershipServiceFound=true;
????????????}?
????????}

????????return?passwdMembershipPeerGroupModuleImplAdv;
????}

????private??ModuleImplAdvertisement?createPasswdMembershipServiceModuleImplAdv(?ModuleImplAdvertisement?allPurposePeerGroupMemershipServiceModuleImplAdv)?{
????????ModuleImplAdvertisement?passwdMembershipServiceModuleImplAdv?=?(ModuleImplAdvertisement)?AdvertisementFactory.newAdvertisement(ModuleImplAdvertisement.getAdvertisementType());
????????passwdMembershipServiceModuleImplAdv.setModuleSpecID(PasswdMembershipService.passwordMembershipSpecID);
????????passwdMembershipServiceModuleImplAdv.setCode(PasswdMembershipService.class.getName());
????????passwdMembershipServiceModuleImplAdv.setDescription("?Module?Impl?Advertisement?for?the?PasswdMembership?Service");
????????passwdMembershipServiceModuleImplAdv.setCompat(allPurposePeerGroupMemershipServiceModuleImplAdv.getCompat());
????????passwdMembershipServiceModuleImplAdv.setUri(allPurposePeerGroupMemershipServiceModuleImplAdv.getUri());
????????passwdMembershipServiceModuleImplAdv.setProvider(allPurposePeerGroupMemershipServiceModuleImplAdv.getProvider());
????????return?passwdMembershipServiceModuleImplAdv;
????}
好了.之后你就可以利用這個ModuleImplAdvertisement 來建立你的應(yīng)用中專用的對等組了.

PS:關(guān)于如何讓JXTA在不同的網(wǎng)絡(luò)中進(jìn)行通訊的問題,雖然JXTA里面已經(jīng)說明了自己有這樣的能力可以做到.但是到底是如何實現(xiàn)呢? 下次再說 ^_^

轉(zhuǎn)載于:https://www.cnblogs.com/TtTiCk/archive/2006/08/30/490678.html

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