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Socket编程客户端代码：publicclassClient{privateStringhost="127.0.0.1";privateintport=8000;privateSocketsocket;/**CreatesanewinstanceofClinet*/publicClient(){try{Socketsocket=newSocket(host,port);InputStreamis=socket.getInputStream();InputStreamReaderisr=newInputStreamReader(is);BufferedReaderbr=newBufferedReader(isr);System.out.println(br.readLine());}catch(UnknownHostExceptione){e.printStackTrace();}catch(IOExceptione){e.printStackTrace();}}publicstaticvoidmain(String[]args){Clientclient=newClient();}}服务器端代码：ServerpublicServer(){try{serverSocket=newServerSocket(port);System.out.println("服务器已启动"+serverSocket.getInetAddress().toString());}catch(IOExceptione){e.printStackTrace();}}publicvoidservice(){while(true){try{Socketsocket=serverSocket.accept();System.out.println("有新连接，IP客户端IP是"+socket.getInetAddress().toString()+",端口是"+socket.getPort()+"");OutputStreamos=socket.getOutputStream();PrintWriterpw=newPrintWriter(os);pw.write("欢迎登录！");pw.flush();}catch(IOExceptione){e.printStackTrace();}}}publicstaticvoidmain(String[]args){//TODOcodeapplicationlogichereServerserver=newServer();server.service();}单线程编程：publicclassTalkThreadextendsThread{privateintsleeptime;publicTalkThread(){sleeptime=(int)(Math.random()*5000);}publicvoidrun(){System.err.println(this.getName()+"isgoingtostart,itwillsleepfor"+sleeptime+"ms");try{Thread.sleep(sleeptime);}catch(Exceptione){e.printStackTrace();}System.err.println(this.getName()+"wakedup!");}}多线程编程：publicclassMulitiThreadDemo{publicMulitiThreadDemo(){}publicstaticvoidmain(String[]args){TalkThreadtalkThread1=newTalkThread();TalkThreadtalkThread2=newTalkThread();TalkThreadtalkThread3=newTalkThread();TalkThreadtalkThread4=newTalkThread();System.err.println("Threadisstarting...");talkThread1.start();talkThread2.start();talkThread3.start();talkThread4.start();System.err.println("Threadstarted!");}}JavaMailpublicclassSendMail{publicstaticvoidmain(
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