FTP - server 만들기

 개요

 JAVA로 간단한 FTP 서버를 만들어보자.

 소스

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import java.io.BufferedOutputStream; import java.io.DataInputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.net.ServerSocket; import java.net.Socket;     public class Server {       public static void main(String[] args) {         ServerSocket serverSocket = null;         Socket socket = null;                  try{             //리스너 소켓 생성 후 대기             serverSocket = new ServerSocket(8521);             System.out.println("#####    서버실행    #####");                          //클라이언트와 연결 완료             socket = serverSocket.accept();             System.out.println("#####    연결완료    #####");                          //수신시작             FileReceiver fr = new FileReceiver(socket);             fr.start();                      }catch(IOException e){             e.printStackTrace();         }       }   }   class FileReceiver extends Thread{     Socket socket;     DataInputStream dis;     FileOutputStream fos;     BufferedOutputStream bos;              String filePath = "D:\\ForSecurity\\data\\";          public FileReceiver(Socket socket){         this.socket = socket;     }          @Override     public void run(){         try{             System.out.println("#####    수신시작    #####");             dis = new DataInputStream(socket.getInputStream());                          //파일명 수신             String fName = dis.readUTF();             System.out.println("#    파일명 : "+fName);                          //파일 생성             File f = new File(filePath+fName);             fos = new FileOutputStream(f);             bos = new BufferedOutputStream(fos);             System.out.println("#    "+fName+" 파일을 생성");                          //파일 쓰기             int len;             int size=4096;             byte[] data = new byte[size];             while((len = dis.read(data))!=-1){                 bos.write(data,0,len);             }                                       bos.flush();             bos.close();             fos.close();             dis.close();                          System.out.println("#    전송완료 사이즈 : "+f.length());                      }catch(IOException e){             e.printStackTrace();         }     } }