网络编程技术代码-7

1、1) arith. java public interface arith extends java.rmi.remote int add(int a, int b) throws java.rmi.remoteexception;2) arith工mpljavapublic class arithlmpl extends unicastremoteobject implements arith private string objectname;public arithlmpl(string s) throws remoteexception super();objectname = s;p

2、ublic int add(int a , int b )int c = new int10;for (int i = 0; i < 10; i+)ci = ai + bi;return c;public static void main(string args)rmisecuritymanager sm=new rmisecuritymanager();system.setsecuritymanager(sm);tryarithlmpl obj=new arithlmpl(narithservern);/locateregistry.createregistry(3000);namin

3、g. rebind (arithappjava public class arithapp public static void main(string args) int a=l,2,3,4,5,6,7,8,9,10; int b=l,2,3,4,5,6,7,8,9,10;int resunew int10; tryarith obj=(arith)naminglookup(hrmi:/127.0.0.1:1099/arithserverh); result=obj.add(a, b);catch(exception e)systemout.printin(narithappn+e.getm

4、essage();e.printstacktrace ();system, out .print ( "the sum=11); for(int i=0;i<resultlength;i+)system. out .print (result i + ”f,); system.outprintin (); rmi : /127.0.0.1:1099/arithserver n, ob j);systemout.printin(narithserver bound in registryh;catch(exception e)system out .print in ("

5、;arithlmpl. error: n+e .getmessage ();e.printstacktrace ();1) city2java public interface city2 extends remote int getpopulation() throws remoteexception;int gettemperature() throws remoteexception;2 ) cityfautory j avapublic interface cityfactory extends remotecity2impl getcityserver(string cityname

6、) throws remoteexception;3) city2工mpljavapublic class city2impl extends unicastremoteobject implements city2 private string cityname;publie city2impl() throws remoteexceptionsuper ()；publie city2impl(string cityname) throws remoteexceptionsuper ()；thiscityname=cityname;public int getpopulation() thr

7、ows remoteexceptionif(cityname.equals(ntorontoh) return 10;else if (cityname .equals (,ottawan) ) return 2;elsereturn 0;public int gettemperature() throws remoteexceptionreturn 1;5) city2app.javapublic class city2app public static void main(string args) remote obj=null;city2 ottawa=null;city2 toront

8、o=null;int ottawapopulation=0;int torontopopulation=0;t rynaming.lookup(n rmi:/1270.0.1:109 9/cityfactory h;catch(exception e)e.printstacktrace();tryottawa=new cityfactorylmpl () . getcityserver (l,ottawan); toronto=new cityfactorylmpl() .getcityserver(htoronto n);catch(remoteexception e)eprintstauk

9、trace();tryo11 awap opulation=ott awa.getpopulation(); torontopopulation=torontogetpopulation ();catch(remoteexception e)e.printstacktrace ();system. out. print in (11 the population of ottawais:n+ottawapopulation);system.out.printin("the population of torontois:n +torontopopulat ion);/1) callb

10、ack.javapublic interface callback void tempchanged(string cityname, int temp);2) callcityjavapublic interface callcity extends remoteint getpopulation(string cityname) throws remoteexception;int gettemperature(string cityname) throws remoteexception; void register(callback cb) throws remoteexception

11、;3) callcitytmpljavapublic class callcityimpl extends unicastremoteobject implements callcity vector list=new vector ();private string name;public callcityimpl(string name) throws remoteexceptionsuper ();this name=name;public int getpopulation(string cityname) throws remoteexception if (cityname equ

12、als (ntoronto11) ) return 10;jelse if (cityname .equals (f,ottawa”) return 2;elsereturn 0;public int gettemperature(string cityname) throws remoteexception return 1;public void register(callback cb)listaddelement(cb);public static void main(string args) system.setsecuritymanager(new rmisecuritymanag

13、er(); t rycallcitylmpl ob j=new callcitylmpl (l,callcityimpln);naming. rebind (n rmi : /127 0 0 1:1099/callcityimpln , ob j); system. out. print in (11 cityserver bo und in registry!11);catch(exception e) e.printstacktrace();4) callcityappj avapublic class callcityapp implements callback,serializabl

14、epublic static void main(string args) int pop = 0;try callcity obj = (callcity)naming. lookup (11 rmi: /127.0.0.1:1099/callcityimpln);pop = obj . getpopulation (ntoronto11); catch (exception e) eprintstauktrace();system.out.printin("the population of toronto is:n + pop);public void tempchanged(

15、string cityname, int temp)system out.printin(ndynamic update:n);system.out.printin("cityname:n+cityname);system.out.printin(n temp:n+temp);5) callcity2工mpljavapublic class callcity2lmpl extends unicastremoteobject implements callcityvector list=new vector();private string name;public callcity2i

16、mpl(string name) throws remoteexception super ()； thisname=name;public int getpopulation(string cityname) throws remoteexception if(cityname.equals("toronto")return 10;else if (cityname .equals (,ottawan) ) return 2;else return 0;public int gettemperature(string cityname) throws remoteexce

17、ption return 1;public void register(callback cb)listaddelement(cb);public static void main(string args)system setsecuritymanager(new rmisecuritymanager();trycallcitylmpl ob j=new callcitylmpl (l,callcityimpln); naming. rebind (n rmi : /127 0 0 1:1099/callcityimpln , ob j); system.outprintin(”callcit

18、ylmpl. bound in registry!h);catch(exception e)e.printstacktrace();public void settemp(string cityname,int tmp)for(int i=0;i<listsize();i+)callback cb=(callback)listelementat (i);cbtempchanged(cityname, tmp);6) callcity2appjavapublic class callcity2app implements callback!public static void main(s

19、tring args)int pop=0;callback c=(callback) new callcityapp();callcity obj=null;tryobj=(callcity)naming.lookup(n rmi:/127.0.0.1:1099/callcityhmpu1); pop=ob j . getpopulation (htoronto11);catch(exception e)system.out.print "("arithapp exception:n+e.getmessage(); e.printstacktrace();tryobjregister(c);catch(remoteexception e) system .ou匕.println ("error11); e.printstacktrace();system.out.println(nthe population of toronto is:n + pop);public void tempchanged(string cityname, int temp)system.outprintin(ndynamic update:n)fsystem.outprintln