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名片设计 CorelDRAW Illustrator AuotoCAD Painter 其他软件 Photoshop Fireworks Flash |
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//程序名 :TelnetApp.Java import java.applet.*; import java.awt.*; import java.io.*; import java.net.*; import java.util.*; public class TelnetApp extends Applet implements Runnable { //声明成员变量 Thread client; TextArea log; TextField hostname; TextField userid; TextField password; Label hname; Label uid; Label psd; Button connect; Button bye; int wantTime; boolean logged; Socket socket =null; PrintStream os; DataInputStream is; public TelnetApp() { resize(400,300); setLayout(new BorderLayout()); Panel p1=new Panel(); log =new TextArea(10,80); log.setEditable(true); p1.add(log); add(\"North\",p1); Panel p2=new Panel(); p2.add(hname=new Label(\"Hostname\")); p2.add(hostname =new TextField(20)); p2.add(uid= new Label(\"Userid:\")); p2.add(userid =new TextField(10)); p2.add(psd =new Label(\"Password:\")); p2.add(password =new TextField(10)); password.setEchoCharacter(\\\'*\\\'); add(\"Center\",p2); Panel p3=new Panel(); p3.add(connect =new Button(\"Connect\")); p3.add(bye =new Button(\"Bye\")); bye.disable(); add(\"South\",p3); logged = false; } public void run() { String fromServer=null; byte b[]=new byte[3]; b[0]=(byte)\\\'n\\\'; while(true){ if((fromServer =getDate())!= null) log.appendText(fromServer +\"/n\"); if(wantTime <0){ bye(); break; } if(logged){ delay(60*1000); log.setText(\" \"); wantTime -= 1; sendData(b,1); } } } //建立主机连接 private boolean connectHost(String hostName) { try{ socket =new Socket(hostName,23); os =new PrintStream(socket.getOutputStream()); is =new DataInputStream(socket.getInputStream()); }catch(UnknownHostException e){ log.setText(\"Trying to connect to unknown host:\" +e); return false; }catch(Exception e){ log.setText(\"Exception:\" +e); return false; } return true; } // 接收信息 String getDate() { String fromServer; int len; byte b[]=new byte[1000]; try{ fromServer =\"\"; len =is.read(b); fromServer += new String(b,0); }catch(Exception e){ log.setText(\"Exception:\"+e); return null; } return fromServer; } //发送信息 boolean sendData(byte b[],int len) { try{ os.write(b,0,len); os.flush(); }catch(Exception e){ log.setText(\"Exception:\" + e); return false; } return true; } //关闭连接 void closeSocket() { try{ os.close(); is.close(); socket.close(); socket = null; }catch(Exception e){ log.setText(\"Exception:\" +e); } } void toByte(byte[] b,String s) { int i; for(i=0;i<s.length();i++) b[i]=(byte)s.charAt(i); b[i] = 13; b[i+1]=10; } void negotiate() { byte b[]=new byte[20]; b[0] =-1;b[1]=-5;b[2]=24; sendData(b,3); delay(400); b[0] =-1;b[1]=-6;b[2]=24; b[3] =0;b[4]=(byte)\\\'D\\\';b[5]=(byte)\\\'E\\\'; b[6] =(byte)\\\'C\\\';b[7]=(byte)\\\'-\\\';b[8]=(byte)\\\'V\\\'; b[9] =(byte)\\\'T\\\';b[10]=(byte)\\\'1\\\';b[11]=(byte)\\\'0\\\'; b[12] =(byte)\\\'0\\\';b[13]=(byte)-1;b[14]=-16; sendData(b,15); delay(400); //其他选项 b[0] =-1;b[1]=-3;b[2]=1; b[3]=-1;b[4]=-3;b[5]=3; b[6]=-1;b[7]=-3;b[8]=31; b[9]=-1;b[10]=-4;b[11]=-56; b[12]=-1;b[13]=-5;b[14]=1; sendData(b,15); delay(400); //login bbs toByte(b,\"bbs\"); sendData(b,5); delay(400); } void login(String userid,String password) { byte b[] =new byte[20]; toByte(b,userid); sendData(b,userid.length()+2); delay(400); toByte(b,password); sendData(b,password.length()+2); delay(400); } boolean enter() { if(connectHost(hostname.getText().trim())) { log.setText(\"connected/n\"); negotiate(); delay(400); login(userid.getText().trim(),password.getText().trim()); return true; } else return false; } void toMainmenu() { byte b[]=new byte[20]; for(int i=0;i<6;i++) { toByte(b,\" \"); sendData(b,2); } for(int i=0;i<1;i++) { b[0] =(byte)\\\'q\\\'; sendData(b,1); delay(200); } } void bye() { byte b[]= new byte[20]; for(int i=0;i<10;i++) { b[0]=(byte)\\\'q\\\'; sendData(b,1); delay(300); } b[0]=(byte)\\\'g\\\'; sendData(b,1); delay(300); for(int i=0;i<6;i++) { toByte(b,\"\"); sendData(b,2); delay(300); } client.stop(); client=null; closeSocket(); connect.enable(); bye.disable(); } void delay(int millisecond) { try{ Thread.sleep(millisecond); }catch(InterruptedException e){ } } public boolean action(Event e,Object arg) { switch(e.id){ case Event.ACTION_EVENT: if(e.target == connect) { wantTime = 20; connect.disable(); bye.enable(); client =new Thread(this); client.start(); if(enter()) toMainmenu(); logged =true; }else if(e.target == bye) bye(); } return true; } public void destroy(){ } public void paint(Graphics g){} public void start(){} public void stop(){ } } 返回类别: 教程 上一教程: JavaVM,反射与动态代理 下一教程: java-汉字问题深入谈 您可以阅读与"一个必看的Java程序"相关的教程: · JSP与JAVAMAIL之3(试着写第一个程序) · 一个JAVA写的背单词程序 · 编写一个JAVA小程序取得IP地址 · 初学Java写的第一个多线程程序 · 一个经典的JAVA APPLET时钟程序(一) |
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