ftp实现简单的文件传输

ftp实现简单的文件传输 package ftp2; import java.io.*; import java.net.*; public class ServerFTP { int port=8083; String filepath="D:\\123.txt"; void start(){ Socket s=null; try { ServerSocket ss=new ServerSocket(port); while(true){ File file=new File(filepath); if(!file.exists()){ file.createNewFile(); } System.out.println("文件长度:"+(int)file.length()); s=ss.accept(); System.out.println("建立socket连接"); DataInputStream dis=new DataInputStream(new BufferedInputStream(new FileInputStream(filepath))); DataOutputStream dos=new DataOutputStream(s.getOutputStream()); dos.writeUTF(file.getName()); dos.writeLong((long)file.length()); int bufferSize=8192; byte[] buf=new byte[bufferSize]; while(true){ int read=0; if(dis!=null){ read=dis.read(buf); } if(read==-1){ break; } dos.write(buf,0,read); } dis.close(); s.close(); System.out.println("文件传输完毕!!"); } } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) { new ServerFTP().start(); } }