java简单网络文件传输

简单实现文件在网络中的传输，要实现高级功能，在此基础上进行修改即可。

分2个类实现，FileSender负责文件发送，FileIncepter负责文件接受：

 

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class FileSender {

	private ServerSocket ss = null;

	public FileSender() {

	}

	public void startSend(String filePath, int port) {
		// socket输出流
		DataOutputStream os = null;
		// 文件输入流
		DataInputStream is = null;
		// 建立socket连接
		Socket socket = null;
		try {
			// 选择进行传输的文件
			File file = new File(filePath);

			// 建立socket监听
			ss = new ServerSocket(port);

			socket = ss.accept();

			os = new DataOutputStream(socket.getOutputStream());

			// 将文件名及长度传给客户端。这里要真正适用所有平台，例如中文名的处理，还需要加工，
			// 具体可以参见Think In Java 4th里有现成的代码。
			os.writeUTF(file.getName());
			os.flush();
			os.writeLong((long) file.length());
			os.flush();

			is = new DataInputStream(new BufferedInputStream(
					new FileInputStream(filePath)));
			// 缓冲区大小
			int bufferSize = 8192;
			// 缓冲区
			byte[] buf = new byte[bufferSize];
			// 传输文件
			while (true) {
				int read = 0;
				if (is != null) {
					read = is.read(buf);
				}

				if (read == -1) {
					break;
				}
				os.write(buf, 0, read);
			}
			os.flush();

		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			// 关闭所有连接
			try {
				if (os != null)
					os.close();
			} catch (IOException e) {
			}
			try {
				if (is != null)
					is.close();
			} catch (IOException e) {
			}
			try {
				if (socket != null)
					socket.close();
			} catch (IOException e) {
			}
			try {
				if (ss != null)
					ss.close();
			} catch (IOException e) {
			}
		}

	}

	public static void main(String[] args) {
		new FileSender().startSend("E:\\JDK_API_1_6_zh_CN.CHM", 8821);
	}
}

 

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;

public class FileIncepter {

	public FileIncepter() {

	}

	public void getFile(String savePath, String ip, int port) {
		// 建立socket连接
		Socket socket = null;
		try {
			socket = new Socket(ip, port);
		} catch (UnknownHostException e1) {
			e1.printStackTrace();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
		// 建立socket输入流
		DataInputStream inputStream = null;
		try {
			inputStream = new DataInputStream(new BufferedInputStream(socket
					.getInputStream()));
		} catch (IOException e1) {
			e1.printStackTrace();
		}
		try {
			// 缓冲区大小
			int bufferSize = 8192;
			// 缓冲区
			byte[] buf = new byte[bufferSize];
			int passedlen = 0;
			long len = 0;
			// 获取文件名称
			savePath += inputStream.readUTF();
			DataOutputStream fileOut = new DataOutputStream(
					new BufferedOutputStream(new BufferedOutputStream(
							new FileOutputStream(savePath))));
			// 获取文件长度
			len = inputStream.readLong();

			System.out.println("文件的长度为:" + len + "  KB");
			System.out.println("开始接收文件!");

			// 获取文件
			while (true) {
				int read = 0;
				if (inputStream != null) {
					read = inputStream.read(buf);
				}
				passedlen += read;
				if (read == -1) {
					break;
				}
				System.out.println("文件接收了" + (passedlen * 100 / len) + "%");
				fileOut.write(buf, 0, read);
			}
			System.out.println("接收完成，文件存为" + savePath);
			fileOut.close();
		} catch (Exception e) {
			e.printStackTrace();
			return;
		}
	}

	public static void main(String[] args) {
		new FileIncepter().getFile("F:\\", "localhost", 8821);
	}
}