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Java利用Socket和IO流实现文件的上传与下载

作者:谷哥的小弟

本文主要介绍了Java利用Socket和IO流实现文件的上传与下载,文中通过示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

背景概述

本文利用Socket编程和IO流技术实现文件的上传与下载。

核心技术

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 {
			// 创建待上传文件对象
			File file = new File(filePath);
			String fileName = file.getName();
			long fileLength = file.length();
			System.out.println("客户端待上传文件:" + fileName + ",其大小为:" + fileLength);

			// 创建FileInputStream
			FileInputStream fileInputStream = new FileInputStream(filePath);

			// 创建Socket对象
			Socket socket = new Socket(Config.ip, Config.port);
			// 从Socket获取OutputStream
			OutputStream outputStream = socket.getOutputStream();
			// 创建DataOutputStream
			DataOutputStream dataOutputStream = new DataOutputStream(outputStream);

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

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

			// 释放资源
			dataOutputStream.flush();
			fileInputStream.close();
			socket.close();
		} catch (Exception e) {
			System.out.println(e.toString());
		}
	}

	public void downloadFile() {
		try {
			// 创建Socket对象
			Socket socket = new Socket(Config.ip, Config.port);
			// 从Socket获取InputStream
			InputStream inputStream = socket.getInputStream();
			// 创建DataInputStream对象
			DataInputStream dataInputStream = new DataInputStream(inputStream);

			// 获取下载文件的文件名和文件大小
			String fileName = dataInputStream.readUTF();
			long fileLength = dataInputStream.readLong();
			System.out.println("客户端下载文件:" + fileName + ",其大小为:" + fileLength);

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

			// 创建FileOutputStream对象
			FileOutputStream fileOutputStream = new FileOutputStream(filePath);

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

			// 释放资源
			fileOutputStream.flush();
			fileOutputStream.close();
			dataInputStream.close();
			socket.close();
		} catch (Exception e) {
			System.out.println(e.toString());
		}
	}

}

在这里插入图片描述

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 {
			// 创建ServerSocket对象
			ServerSocket serverSocket = new ServerSocket(Config.port);
			while (true) {
				// 接收客户端连接请求
				Socket socket = serverSocket.accept();
				// 开启子线程处理文件上传
				UploadRunnableImpl uploadRunnableImpl = new UploadRunnableImpl(socket);
				Thread thread = new Thread(uploadRunnableImpl);
				thread.start();
			}
		} catch (Exception e) {
			System.out.println(e.toString());
		}

	}

	public void handleDownloadFile() {
		try {
			// 创建ServerSocket对象
			ServerSocket serverSocket = new ServerSocket(Config.port);
			while (true) {
				// 接收客户端连接请求
				Socket socket = serverSocket.accept();
				// 开启子线程处理文件下载
				DownloadRunnableImpl downloadRunnableImpl = new DownloadRunnableImpl(socket);
				Thread thread = new Thread(downloadRunnableImpl);
				thread.start();
			}
		} catch (Exception e) {
			System.out.println(e.toString());
		}
	}

}

在这里插入图片描述

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 {
			// 从Socket获取InputStream
			InputStream inputStream = socket.getInputStream();
			// 创建DataInputStream对象
			DataInputStream dataInputStream = new DataInputStream(inputStream);
			
			// 获取上传文件的文件名和文件大小
			String fileName = dataInputStream.readUTF();
			long fileLength = dataInputStream.readLong();
			System.out.println("服务端接收上传文件:"+fileName+",其大小为:"+fileLength);
			
			// 组拼文件保存路径
			String fileDir = "E:";
			String filePath= fileDir + File.separator+fileName;
			
			// 创建FileOutputStream对象
			FileOutputStream fileOutputStream = new FileOutputStream(filePath);
			
			// IO流读写操作
			byte[] buf = new byte[1024*1];
			int len = 0;
			while ((len = dataInputStream.read(buf)) != -1) {
				fileOutputStream.write(buf, 0, len);
			}
			
			// 释放资源
			fileOutputStream.flush();
			fileOutputStream.close();
			dataInputStream.close();
			socket.close();
		} catch (Exception e) {
			System.out.println(e.toString());
		}

	}

}

在这里插入图片描述

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 {
			// 创建待下载文件对象
			String filePath = "E:"+File.separator+"beauty.jpg";
			File file = new File(filePath);
			String fileName = file.getName();
			long fileLength = file.length();
			System.out.println("服务端待下载文件:" + fileName + ",其大小为:" + fileLength);

			// 创建FileInputStream
			FileInputStream fileInputStream = new FileInputStream(filePath);

			// 从Socket获取OutputStream
			OutputStream outputStream = socket.getOutputStream();
			// 创建DataOutputStream
			DataOutputStream dataOutputStream = new DataOutputStream(outputStream);

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

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

			// 释放资源
			dataOutputStream.flush();
			fileInputStream.close();
			socket.close();
		} catch (Exception e) {
			System.out.println(e.toString());
		}
	}

}

在这里插入图片描述

到此这篇关于Java利用Socket和IO流实现文件的上传与下载的文章就介绍到这了,更多相关Java 文件上传与下载内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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