Java利用Socket和IO流實(shí)現(xiàn)文件的上傳與下載

更新時(shí)間：2022年04月12日 15:51:59 作者：谷哥的小弟

本文主要介紹了Java利用Socket和IO流實(shí)現(xiàn)文件的上傳與下載，文中通過(guò)示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

背景概述

本文利用Socket編程和IO流技術(shù)實(shí)現(xiàn)文件的上傳與下載。

核心技術(shù)

1、TCP
2、Socket
3、FileInputStream與FileOutputStream
4、DataInputStream與DataOutputStream
5、多線程

Config

package com.io14;
/**
 * 本文作者：谷哥的小弟 
 * 博客地址：http://blog.csdn.net/lfdfhl
 */
public class Config {
	public static final String ip = "localhost";
	public static final int port = 10088;
}

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Client

package com.io14;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
/**
 * 本文作者：谷哥的小弟 
 * 博客地址：http://blog.csdn.net/lfdfhl
 */
public class Client {

	public static void main(String arg[]) {
		testDownload();
	}

	public static void testUpload() {
		String filePath = "D:" + File.separator + "beauty.jpg";
		Client client = new Client();
		client.uploadFile(filePath);
	}

	public static void testDownload() {
		Client client = new Client();
		client.downloadFile();
	}

	public void uploadFile(String filePath) {
		try {
			// 創(chuàng)建待上傳文件對(duì)象
			File file = new File(filePath);
			String fileName = file.getName();
			long fileLength = file.length();
			System.out.println("客戶端待上傳文件：" + fileName + "，其大小為：" + fileLength);

			// 創(chuàng)建FileInputStream
			FileInputStream fileInputStream = new FileInputStream(filePath);

			// 創(chuàng)建Socket對(duì)象
			Socket socket = new Socket(Config.ip, Config.port);
			// 從Socket獲取OutputStream
			OutputStream outputStream = socket.getOutputStream();
			// 創(chuàng)建DataOutputStream
			DataOutputStream dataOutputStream = new DataOutputStream(outputStream);

			// 利用DataOutputStream寫出文件名和文件大小
			dataOutputStream.writeUTF(fileName);
			dataOutputStream.writeLong(fileLength);
			dataOutputStream.flush();

			// IO流讀寫操作
			byte[] buf = new byte[1024 * 1];
			int len = 0;
			while ((len = fileInputStream.read(buf)) != -1) {
				dataOutputStream.write(buf, 0, len);
			}

			// 釋放資源
			dataOutputStream.flush();
			fileInputStream.close();
			socket.close();
		} catch (Exception e) {
			System.out.println(e.toString());
		}
	}

	public void downloadFile() {
		try {
			// 創(chuàng)建Socket對(duì)象
			Socket socket = new Socket(Config.ip, Config.port);
			// 從Socket獲取InputStream
			InputStream inputStream = socket.getInputStream();
			// 創(chuàng)建DataInputStream對(duì)象
			DataInputStream dataInputStream = new DataInputStream(inputStream);

			// 獲取下載文件的文件名和文件大小
			String fileName = dataInputStream.readUTF();
			long fileLength = dataInputStream.readLong();
			System.out.println("客戶端下載文件：" + fileName + "，其大小為：" + fileLength);

			// 組拼文件保存路徑
			String fileDir = "D:";
			String filePath = fileDir + File.separator + fileName;

			// 創(chuàng)建FileOutputStream對(duì)象
			FileOutputStream fileOutputStream = new FileOutputStream(filePath);

			// IO流讀寫操作
			byte[] buf = new byte[1024 * 1];
			int len = 0;
			while ((len = dataInputStream.read(buf)) != -1) {
				fileOutputStream.write(buf, 0, len);
			}

			// 釋放資源
			fileOutputStream.flush();
			fileOutputStream.close();
			dataInputStream.close();
			socket.close();
		} catch (Exception e) {
			System.out.println(e.toString());
		}
	}

}

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Server

package com.io14;

import java.net.ServerSocket;
import java.net.Socket;
/**
 * 本文作者：谷哥的小弟 
 * 博客地址：http://blog.csdn.net/lfdfhl
 */
public class Server {
	public static void main(String arg[]) {
		testDownload();
	}
	
	public static void testUpload() {
		Server server = new Server();
		server.handleUploadFile();
	}
	
	public static void testDownload() {
		Server server = new Server();
		server.handleDownloadFile();
	}

	public void handleUploadFile() {
		try {
			// 創(chuàng)建ServerSocket對(duì)象
			ServerSocket serverSocket = new ServerSocket(Config.port);
			while (true) {
				// 接收客戶端連接請(qǐng)求
				Socket socket = serverSocket.accept();
				// 開啟子線程處理文件上傳
				UploadRunnableImpl uploadRunnableImpl = new UploadRunnableImpl(socket);
				Thread thread = new Thread(uploadRunnableImpl);
				thread.start();
			}
		} catch (Exception e) {
			System.out.println(e.toString());
		}

	}

	public void handleDownloadFile() {
		try {
			// 創(chuàng)建ServerSocket對(duì)象
			ServerSocket serverSocket = new ServerSocket(Config.port);
			while (true) {
				// 接收客戶端連接請(qǐng)求
				Socket socket = serverSocket.accept();
				// 開啟子線程處理文件下載
				DownloadRunnableImpl downloadRunnableImpl = new DownloadRunnableImpl(socket);
				Thread thread = new Thread(downloadRunnableImpl);
				thread.start();
			}
		} catch (Exception e) {
			System.out.println(e.toString());
		}
	}

}

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UploadRunnableImpl

package com.io14;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.Socket;
/**
 * 本文作者：谷哥的小弟 
 * 博客地址：http://blog.csdn.net/lfdfhl
 */
public class UploadRunnableImpl implements Runnable {
	private Socket socket;
	
	public UploadRunnableImpl(Socket socket) {
		this.socket = socket;
	}

	@Override
	public void run() {
		try {
			// 從Socket獲取InputStream
			InputStream inputStream = socket.getInputStream();
			// 創(chuàng)建DataInputStream對(duì)象
			DataInputStream dataInputStream = new DataInputStream(inputStream);
			
			// 獲取上傳文件的文件名和文件大小
			String fileName = dataInputStream.readUTF();
			long fileLength = dataInputStream.readLong();
			System.out.println("服務(wù)端接收上傳文件："+fileName+"，其大小為："+fileLength);
			
			// 組拼文件保存路徑
			String fileDir = "E:";
			String filePath= fileDir + File.separator+fileName;
			
			// 創(chuàng)建FileOutputStream對(duì)象
			FileOutputStream fileOutputStream = new FileOutputStream(filePath);
			
			// IO流讀寫操作
			byte[] buf = new byte[1024*1];
			int len = 0;
			while ((len = dataInputStream.read(buf)) != -1) {
				fileOutputStream.write(buf, 0, len);
			}
			
			// 釋放資源
			fileOutputStream.flush();
			fileOutputStream.close();
			dataInputStream.close();
			socket.close();
		} catch (Exception e) {
			System.out.println(e.toString());
		}

	}

}

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DownloadRunnableImpl

package com.io14;

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.net.Socket;
/**
 * 本文作者：谷哥的小弟 
 * 博客地址：http://blog.csdn.net/lfdfhl
 */
public class DownloadRunnableImpl implements Runnable{
	private Socket socket;
	
	public DownloadRunnableImpl(Socket socket) {
		this.socket = socket;
	}

	@Override
	public void run() {
		try {
			// 創(chuàng)建待下載文件對(duì)象
			String filePath = "E:"+File.separator+"beauty.jpg";
			File file = new File(filePath);
			String fileName = file.getName();
			long fileLength = file.length();
			System.out.println("服務(wù)端待下載文件：" + fileName + "，其大小為：" + fileLength);

			// 創(chuàng)建FileInputStream
			FileInputStream fileInputStream = new FileInputStream(filePath);

			// 從Socket獲取OutputStream
			OutputStream outputStream = socket.getOutputStream();
			// 創(chuàng)建DataOutputStream
			DataOutputStream dataOutputStream = new DataOutputStream(outputStream);

			// 利用DataOutputStream寫出文件名和文件大小
			dataOutputStream.writeUTF(fileName);
			dataOutputStream.writeLong(fileLength);
			dataOutputStream.flush();

			// IO流讀寫操作
			byte[] buf = new byte[1024 * 1];
			int len = 0;
			while ((len = fileInputStream.read(buf)) != -1) {
				dataOutputStream.write(buf, 0, len);
			}

			// 釋放資源
			dataOutputStream.flush();
			fileInputStream.close();
			socket.close();
		} catch (Exception e) {
			System.out.println(e.toString());
		}
	}

}

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