Java利用Socket和IO流实现文件的上传与下载

Java利用Socket和IO流实现文件的上传与下载

目录背景概述核心技术ConfigClientServerUploadRunnableImplDownloadRunnableImpl

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

1、TCP2、Socket3、FileInputStream与FileOutputStream4、DataInputStream与DataOutputStream5、多线程

Config

package com.io14;

/**

* 博客地址：http://blog.csdn.net/lfdfhl

*/

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;

/**

* 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());

}

}

}

Server

package com.io14;

import java.net.ServerSocket;

import java.net.Socket;

/**

* 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();

}

publhttp://ic 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;

/**

* 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());

}

}

}

DownloadRunnableImpl

package com.io14;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.OutputStream;

import java.net.Socket;

/**

* 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());

}

}

}

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