这篇文章主要介绍了Java怎么利用Socket和IO流实现文件的上传与下载的相关知识,内容详细易懂,操作简单快捷,具有一定借鉴价值,相信大家阅读完这篇Java怎么利用Socket和IO流实现文件的上传与下载文章都会有所收获,下面我们一起来看看吧。
核心技术
TCP
Socket
FileInputStream与FileOutputStream
DataInputStream与DataOutputStream
多线程
Config
package com.io14;public class Config {public static final String ip = "localhost";public static final int port = 10088;}
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;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FileInputStreamFileInputStream fileInputStream = new FileInputStream(filePath);// 创建Socket对象Socket socket = new Socket(Config.ip, Config.port);// 从Socket获取OutputStreamOutputStream outputStream = socket.getOutputStream();// 创建DataOutputStreamDataOutputStream 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InputStreamInputStream 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());}}}
Server
package com.io14;import java.net.ServerSocket;import java.net.Socket;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());}}}
UploadRunnableImpl
package com.io14;import java.io.DataInputStream;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.net.Socket;public class UploadRunnableImpl implements Runnable {private Socket socket;public UploadRunnableImpl(Socket socket) {this.socket = socket;}@Overridepublic void run() {try {// 从Socket获取InputStreamInputStream 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());}}}
DownloadRunnableImpl
package com.io14;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.OutputStream;import java.net.Socket;public class DownloadRunnableImpl implements Runnable{private Socket socket;public DownloadRunnableImpl(Socket socket) {this.socket = socket;}@Overridepublic 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FileInputStreamFileInputStream fileInputStream = new FileInputStream(filePath);// 从Socket获取OutputStreamOutputStream outputStream = socket.getOutputStream();// 创建DataOutputStreamDataOutputStream 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());}}}
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