java语言程序设计解答例题复习题答案30review.pdf

Chapter30Networking

1.YouusenewServerSocket(port)tocreateaserversocket.Youcanuse

anynumberafter1024.Ifaportisalreadyinuse,youwillgetanexception;then

youcanchooseanothernumber.Youcanhaveaserverrunningonaportserving

multipleclients.

2.Aserversocketcanhandleconnectionrequestsfromaclient.Afterthe

connectionisestablished,thecommunicationsbetweentheserverandtheclient

arethroughtheclientsockets.

3.TheclientprogramusesnewSocket(hostname,port)torequesta

connectiontotheserver.

4.Theserverlistensforconnectingrequestsfromclientsbyinvoking

serverSocket.accept(),whichblockstheprogramfromexecutingthe

nextstatementuntilaconnectionisestablished.

5.YouneedtousegetInputStream()tocreateastreamtoreceivedatafrom

thesocketandusegetOutputStream()tocreateastreamtosenddatafrom

thesocket.

6.TofindtheIPaddressofaclientthatconnectstoaserver,usegetInetAddress()

fromthesocket.ThenusethegetHostName()andgetHostAddress()toobtainthe

hostnameandIPaddressfromanInetAddressinstance.

7.UsetheThreadclassandcreatemultiplethreadstohandlemultipleconnections,

onethreadperclient.

8.No.Anappletcanonlyconnecttotheserverfromthemachinewheretheappletis

loaded.

9.