JAVA FTP 文件传输 服务端 客户端

package ftpTEST; import java.io.DataInputStream; import java.io.File; import java.io.FileOutputStream; import java.math.RoundingMode; import java.net.ServerSocket; import java.net.Socket; import java.text.DecimalFormat; public class FileTransferServer { public static int SERVER_PORT = 0; // 服务端端口 private static DecimalFormat df = null; public File directory ; public ServerSocket serversocket ; static { // 设置数字格式，保留一位有效小数 df = new DecimalFormat("#0.0"); df.setRoundingMode(RoundingMode.HALF_UP); df.setMinimumFractionDigits(1); df.setMaximumFractionDigits(1); } public FileTransferServer(int port,String path) throws Exception { FileTransferServer.SERVER_PORT = port; this.directory = new File(path); serversocket = new ServerSocket(SERVER_PORT); } public void load() throws Exception { while (true) { Socket socket = serversocket.accept(); new Thread(new Task(socket)).start(); } } class Task implements Runnable { private Socket socket; private DataInputStream dis; private FileOutputStream fos; public Task(Socket socket) { this.socket = socket; } @Override public void run() { try { dis = new DataInputStream(socket.getInputStream()); // 文件名和长度 String fileName = dis.readUTF(); long fileLength = dis.readLong(); if(!directory.exists()) { directory.mkdir(); } File file = new File(directory.getAbsolutePath() + File.separatorChar + fileName); fos = new FileOutputStream(file); // 开始接收文件 byte[] bytes = new byte[1024]; int length = 0; while((length = dis.read(bytes, 0, bytes.length)) != -1) { fos.write(bytes, 0, length); fos.flush(); } System.out.println("======== 文件接收成功 [File Name：" + fileName + "] [Size：" + getFormatFileSize(fileLength) + "] ========"); } catch (Exception e) { e.printStackTrace(); } finally { try { if(fos != null) fos.close(); if(dis != null) dis.close(); socket.close(); } catch (Exception e) {} } } } private String getFormatFileSize(long length) { double size = ((double) length) / (1 << 30); if(size >= 1) { return df.format(size) + "GB"; } size = ((double) length) / (1 << 20); if(size >= 1) { return df.format(size) + "MB"; } size = ((double) length) / (1 << 10); if(size >= 1) { return df.format(size) + "KB"; } return length + "B"; } }