Small exercises socket transmission of the picture, a little mistake Great God help look . .

import java.io.BufferedInputStream;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.net.Socket;
  import java.net.UnknownHostException;
  
  public class PicClient {
  	public static void main(String[] args) {
  		try {
  
  			Socket s = new Socket("localhost", 10007);
  			FileInputStream fis = new FileInputStream("E:\\壁纸\\05.jpg");
  			BufferedInputStream bis = new BufferedInputStream(fis);
  			OutputStream os = s.getOutputStream();
  
  			byte bf[] = new byte[1024];
  			int len = 0;
  
  			while ((len = bis.read(bf)) != -1) {
  				os.write(bf, 0, len);
  			}
  			s.shutdownOutput();
  
  			BufferedInputStream back = new BufferedInputStream(s.getInputStream());
  			byte[] bk = new byte[1024];
  			int lb = back.read(bk) ;
  			
  			System.out.println(new String(bk, 0, lb));
  
  			bis.close();
  			s.close();
  
  		} catch (UnknownHostException e) {
  			e.printStackTrace();
  		} catch (IOException e) {
  			e.printStackTrace();
  		}
  
  	}
  }

client code above :
see tutorial is so written , found only 27 lines running lb = -1; so line 29 will appear subscript out of range ,

But I want to remove all significant byte stored inside the bk do not know what , but to achieve

seek advice. . .

server-side code is as follows :

import java.io.BufferedInputStream;
  import java.io.BufferedOutputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.ServerSocket;
  import java.net.Socket;
  
  public class PicServer {
  	public static void main(String[] args){
  		try {
  			ServerSocket ss=new ServerSocket(10007);
  			Socket s=ss.accept();
  			
  			String ip=s.getInetAddress().getHostAddress();
  			System.out.print(ip);
  			
  			InputStream is=s.getInputStream();
  			BufferedInputStream bis=new BufferedInputStream(is);
  			
  			FileOutputStream fos=new FileOutputStream("E:\\05.jpg");
  			BufferedOutputStream bos=new BufferedOutputStream(fos);
  			
  			byte[] bt=new byte[1024];
  			int len=0;
  			while((len=bis.read(bt))!=-1){
  				bos.write(bt, 0, len);
  			}
  			
  			BufferedOutputStream bac=new BufferedOutputStream(s.getOutputStream());
  			
  			bac.write("图片传送成功!".getBytes());
  			
  			bos.close();
  			ss.close();
  			s.close();
  			
  		} catch (IOException e) {
  			// TODO Auto-generated catch block
  			e.printStackTrace();
  		}
  		
  		
  	}
  }

------ Solution ------------------------------------- -------
Client -side

			byte[] bk=new byte[1024];
  			int lb=0;
  			int i;
  			while((i=back.read())!=-1){
  				lb++;
  			}
  			System.out.println(lb);
  			System.out.println(new String(bk,0,lb));
  

Server side BufferedOutputStream finish, coupled with close method .

your problem solved, but the code does not solve the problem . . . .
------ For reference only -------------------------------------- -

byte[] bk = new byte[1024];
  			int lb = 0;
  			while ((lb = back.read(bk)) != -1)
  				System.out.println(new String(bk, 0, lb));

directly like this , do not return information before tried to write that this is wrong, ,

After a while I found your bac remind the stream is not closed , resulting did not write out

Thank