在套接字

Question

我在套接字上创建一个传输文件的程序。保存文件后，其大小会增加。这是源代码Server-class：

import java.io.*;
import java.net.*;

public class FileServer {
 static final int port = 3000;

 public static void main(String[] args) {
     try {
         ServerSocket server = new ServerSocket(port);
         Socket client = server.accept();
         DataInputStream input = new DataInputStream(client.getInputStream());
         int size = 2358464;
         byte[] buffer = new byte[size];

         while (true) {
             int receivedBytes = input.read(buffer);
             if (receivedBytes == -1) break;
         }

         input.close();
         client.close();
         server.close();

         FileOutputStream fos = new FileOutputStream("D:\\Projects\\Courses\\loadedFile.s3db");
         fos.write(buffer);
         fos.close();
     } catch (Exception ex) {
         System.out.println(ex);
     }
 }}

客户端级：

import java.io.*;
import java.net.*;

public class Client {
 public static void main(java.lang.String[] args) throws FileNotFoundException {

         final int port = 3000;
         try {
             File file = new File("D:\\Projects\\Courses\\src\\Data", "data.s3db");

             FileInputStream input = new FileInputStream(file);
             int size = (int) file.length();
             byte[] buffer = new byte[size];

             Socket socket = new Socket("127.0.0.1", port);
             DataOutputStream out = new DataOutputStream(socket.getOutputStream());

             while (true) {
                 int receivedBytes = input.read(buffer);
                 if (receivedBytes == -1) {
                     break;
                 }
                 if (receivedBytes > 0) {
                     out.write(buffer, 0, receivedBytes);
                 }
             }

             input.close();
             out.close();
             socket.close();
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }

结果，转移后最初大小为6 kb的文件开始重2304 kb。在什么阶段文件大小增加？如何避免这种情况？