[자바 네트워크][newtwork] 기본 코드들

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import java.net.*; import java.io.*;   public class Ex02_01  {     public static void main(String[] args)     {         try         {             //InetAddress ia = new InetAddress(); 처럼 하면 좋겠지만              //InetAddress 는 생성자 자체가 존재하지 않기때문에 쓸수없다                     InetAddress[] ia = InetAddress.getAllByName("www.naver.com");    //여러개의 주소를 얻는방법                          for(int i=0; i < ia.length ; i++)             {                 System.out.println(i + 1 + "번째의 주소 => " + ia[i].getHostName() +"   아이피 => "+ia[i].getHostAddress());             }         }         catch(UnknownHostException e){}              } }

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import java.net.*; import java.io.*;   public class Ex02_02  {     public static void main(String[] args)     {         try        //외부주소 알아내기         {             InetAddress ia = InetAddress.getByName("www.naver.com");    //주소 한개만 알아내기                         System.out.println(ia.getHostAddress());             System.out.println(ia.getHostName());                     }         catch(UnknownHostException e){}                  try        // 내컴 주소 알아내기         {             InetAddress iaa = InetAddress.getLocalHost();             System.out.println(iaa);         }         catch(UnknownHostException e){}              } }

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import java.net.*; import java.io.*;   public class Ex02_03  {     public static void main(String[] args)     {         try         {             InetAddress ia = InetAddress.getByName("www.naver.com");             byte[] bb = ia.getAddress();        //getAddress를 쓰려면 배열이기 때문에 배열로 넣어줘야된다                                                 //getAddress는 특정객체로부터 배열형태의 IP주소를 빼내어                                                 //byte형식으로 형변환 //            for(int i = 0; i < bb.length ; i++) //            { //                System.out.println(bb[i]); //            }                          for(int ggg : bb)             {                 System.out.print(ggg+"\t");        //125,-47,-34,-115 현재는 이렇게 나온다                                                 //byte 형으로 변환한 번호이다             }                                       byte[] vvv={125,-47,-34,-115};        //위에서 나온 숫자를 getByAddress 를 넣으면 IP주소가 나온다                                                 //125.209.222.141             InetAddress iaa = InetAddress.getByAddress(vvv);             System.out.println("iaa = "+iaa);             System.out.println("dns = "+iaa.getHostName());             System.out.println("ip = "+iaa.getHostAddress());         }         catch(UnknownHostException e){}     } }

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/*  * awt이용   * A.프레임을 통한 현재 컴퓨터 정보 표시  * B.프레임에서 특정 대상컴퓨터의 정보 표시 예제  */   import java.net.*; import java.awt.*; import java.awt.event.*;   class Ex02_04Sub extends Frame implements ActionListener    //Frame을 상속받고 Action이벤트를 쓰기위해  implements 로  {     //사용할 객체 생성     private Label lb = new Label("사이트 : ", Label.RIGHT);    //     private TextField tf = new TextField();        //입력창으로 이용할 객체 생성     private TextArea ta = new TextArea();        //결과창으로 사용할 객체생성     private Button bt = new Button("Clear");    //Clear라는 이름을 가진 버튼 객체 생성     private Button bt1 = new Button("End");        //End라는 이름을 가진 버튼 객체 생성               public Ex02_04Sub(String str)     {         super(str);         this.init();         this.start();         this.setSize(300,200);         this.setVisible(true);        //보이도록 세팅할것이냐~!!!     }          public void init()        //위에서 만든 사용할 객체 생성한것으로 초기 화면 구성 Swing     {         this.setLayout(new BorderLayout());            //Layout 응 BorderLayout으로 세팅         this.add("Center", ta);                        //Center 에 TextArea를 생성         Panel p =new Panel(new BorderLayout());        //Label 과 TextField를 만들기 위한 Panel을 BorderLayout으로 생성         p.add("West", lb);                            //왼쪽에 Label객체를 p에 생성         p.add("Center", tf);                        //가운데에 TextField객체 p에 생성         this.add("North",p);                        //위쪽에 p를 화면에 생성         Panel p1 = new Panel(new FlowLayout(FlowLayout.RIGHT));        //Panel 생성을 FlowLayout형식의 오른쪽으로 생성         p1.add(bt);        //p1에 bt객체 생성만         p1.add(bt1);    //p1에 bt1 객체 생성만         this.add("South", p1);    //이화면에 p1 을 추가후 아래쪽으로 출력     }          public void start()        //시작메소드      {         tf.addActionListener(this);        //textField 에서 이벤트 발생         bt.addActionListener(this);        //clear 버튼 이벤트 발생         bt1.addActionListener(this);    //End 버튼 이벤트 발생 보낸다     }       @Override     public void actionPerformed(ActionEvent e)     //이벤트를 사용하기위한 메소드 생성     {         if(e.getSource() == tf)        //ActionEvent 를 받았는데 내용이 tf면         {             String str = tf.getText().trim();     //str에 textField에 있는 내용을 가져옴                          if(str == null || str.length() == 0)         //str에 null 이거나 str의 길이가 아무것도 없다면             {                 return;                                    //그냥 반환한다             }             try             {                     InetAddress[] ia = InetAddress.getAllByName(str);                 //내 컴퓨터 정보출력                 InetAddress ia1 = InetAddress.getLocalHost();        //로컬의 IP주소를 얻어서 ia1 에 넣는다                 ta.append("Localhost name : " + ia1.getHostName()+"\n");    //textArea에 ia1의 호스트이름을 추가한다                 ta.append("Localhost Address : "+ia1.getHostAddress()+ "\n\n");    //textArea에 가져온 hostAddress를 추가한다.                                  //원격 컴퓨터 정보출력                                 for(int i=0; i< ia.length; i++)                 {                     ta.append("Remotehost[] name : " + ia[i].getHostName()+"\n");    //textArea에 ia의 호스트이름을 추가한다                     ta.append("Remote Address[] : "+ia[i].getHostAddress()+ "\n\n");    //textArea에 가져온 hostAddress를 추가한다.                                          //ta.setText(""); setText는 앞에껄 지우고 덮어쓰기하는것이다.                  }             }             catch(UnknownHostException ee)             {                 ta.setText("Ereer = "+ee.toString());                 return;             }         }         else if(e.getSource() == bt)        //ActionEvent 가 bt이면         {             tf.setText("");        //textField를 공백으로 바꾼다             ta.setText("");        //textAria를 공백으로 바꾼다             tf.requestFocus();    //textField 로 커서를 놓는다         }         else if(e.getSource() == bt1)         {             System.exit(0);         }              } }   public class Ex02_04  {     public static void main(String[] args)     {         Ex02_04Sub es = new Ex02_04Sub("ip관리하기");        //Frame으로 상송받은 Ex02_04Sub 으로                                                          //이름이 ip관리하기로 객체 생성     } }

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import java.net.*; import java.io.*;   public class Ex02_05  {     public static void main(String[] args)     {         InetAddress ia = null;         Socket soc = null;         OutputStream os = null;         InputStream is = null;         try         {             ia = InetAddress.getByName("www.naver.com");                     }         catch(UnknownHostException ee){}         try         {             soc = new Socket(ia,80);    //Socket을 이용하여 ia=주소,80=포트번호로 연결 //            soc = new Socket("www.naver.com",80); //으로도 사용가능                          os = soc.getOutputStream();             is = soc.getInputStream();             /*              OutputStreamWriter osw =new OutputStreamWriter(os);              BufferedWriter bw = new BufferedWriter(osw);              PrintWriter pw = new PrintWriter(bw);                            pw.println("test");   // 이건 지정한 사이트로 전송된다              pw.flush();              */         }         catch(IOException ee){}         System.out.println("soc = "+soc);         System.out.println("os = "+ os);         System.out.println("is = "+ is);     } }

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// 웹페이지 긁어오기   import java.net.*; import java.io.*;   public class Ex02_06  {     public static void main(String[] args)     {         InetAddress ia = null;        //사이트 주소 저장하기위한 준비         Socket soc = null;            //네트워크를 처리할 수 있는 소켓 객체 생성         //        DataOutputStream dos = null;        //이렇게 쓰는방법이있다 //        DataInputStream dis = null;         OutputStream os = null;         InputStream is =null;                  try         {             ia = InetAddress.getByName("www.naver.com");         }         catch(UnknownHostException ee){}                  try         {             soc = new Socket(ia,80);            //포트를 열어주고                          /*    //이렇게 쓰는 방법이있다              * dos =new DataOutputStream(            //출력형식                  new BufferedOutputStream(                     soc.getOutputStream()));             dis = new DataInputStream(            //입력형식                       new BufferedInputStream(                   soc.getInputStream()));              */             os = soc.getOutputStream();             is = soc.getInputStream();                                                        String str = "get http://www.daum.net/index.html http1.0 \r\n\n";                     //get 방식           full 주소                    버전       엔터두번             os.write(str.getBytes());    //서버에게 이야기 한다 write 메소드는 byte밖에 보낼수 없다.str을 Byte방식으로 분할 전달 한다.             while(true)    //이제 받아서 화면상에 보여줘야된다             {                         int xx = is.read();        //soc.getInputStream(); 에서 받은 내용을 xx에 입력                 if(xx == -1)            //더이상 내용이 없으면                 {                     break;                                 }                 System.out.print((char)xx);             }             os.close();             is.close();             soc.close();                                                }         catch(IOException ee){}     } }