How to realize File upload function in Java based on BIO
This article introduces Java based on BIO how to achieve file upload function, the content is very detailed, interested friends can refer to, hope to be helpful to you.
Client package com.qst.file;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.DataOutputStream;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.IOException;import java.io.OutputStream;import java.net.Socket Public class Client {public static void main (String [] args) {try {/ / get the input stream FileInputStream stream = new FileInputStream ("E:\\ Java backend development path\\ IO\\ handout\\ a.txt"); / / request to establish a connection with the server Socket socket = new Socket ("127.0.0.1", 9999) / / the byte output stream is packaged as a data output stream DataOutputStream outputStream = new DataOutputStream (socket.getOutputStream ()); outputStream.writeUTF (".txt"); int len; byte [] b = new byte [1024]; while ((len = stream.read (b)) > 0) {outputStream.write (b, 0, len);} outputStream.flush () / / notify the server that the data has been sent to socket.shutdownOutput ();} catch (Exception e) {/ / TODO: handle exception} server package com.qst.file;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;public class Server {public static void main (String [] args) throws IOException {/ / build server ServerSocket socket = new ServerSocket (9999); Socket accept = socket.accept () / / leave it to a separate thread to handle the file communication requirements with this client. New ServerThread (accept) .start ()
Server-side threading
Package com.qst.file;import java.io.DataInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.net.Socket;import java.util.UUID;public class ServerThread extends Thread {private Socket socket; public ServerThread (Socket accept) {this.socket = accept } @ Override public void run () {try {/ / get a data input stream to read the data sent by the client DataInputStream stream = new DataInputStream (socket.getInputStream ()); / / read the file type sent by the client String suffix = stream.readUTF (); System.out.println ("the server has successfully received the file type:" + suffix) / / define a byte output pipeline responsible for writing out the file data sent by the client FileOutputStream stream2 = new FileOutputStream ("E:\\ Java back-end development path\\ IO\\ handout\\ b.txt" + UUID.randomUUID (). ToString () + suffix); / / read the file data from the data input stream and write it to the byte output stream to byte [] b = new byte [1024]; int len While ((len = stream.read (b)) > 0) {stream2.write (b, 0, len);} System.out.println ("operation completed"); stream2.close (); stream.close ();} catch (IOException e) {/ / TODO Auto-generated catch block e.printStackTrace ();}
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