java基于TCP/IP的用于传输任意大小的文件

Java基于TCP/IP的传输可以使用Socket和ServerSocket类来实现。下面是一个简单的示例代码，可以用于传输任意大小的文件：

import java.io.*;
import java.net.*;

public class FileTransfer {
    public static void main(String[] args) {
        try {
            int fileSize = 1024; // 每次传输的文件大小
            byte[] buffer = new byte[fileSize];
            int bytesRead = 0;

            // 创建Socket连接
            Socket socket = new Socket("localhost", 8888);

            // 读取本地文件
            File file = new File("example.txt");
            FileInputStream fileInputStream = new FileInputStream(file);
            BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);

            // 发送文件大小给服务器
            OutputStream outputStream = socket.getOutputStream();
            DataOutputStream dataOutputStream = new DataOutputStream(outputStream);
            dataOutputStream.writeInt((int) file.length());
            dataOutputStream.flush();

            // 发送文件内容
            while ((bytesRead = bufferedInputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
                outputStream.flush();
            }

            // 关闭连接
            socket.close();
            fileInputStream.close();
            bufferedInputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

服务器端代码如下：

import java.io.*;
import java.net.*;

public class Server {
    public static void main(String[] args) {
        try {
            int fileSize = 1024; // 每次传输的文件大小
            byte[] buffer = new byte[fileSize];
            int bytesRead = 0;

            // 创建ServerSocket
            ServerSocket serverSocket = new ServerSocket(8888);

            // 等待客户端连接
            System.out.println("等待客户端连接...");
            Socket socket = serverSocket.accept();
            System.out.println("客户端已连接!");

            // 接收文件大小
            InputStream inputStream = socket.getInputStream();
            DataInputStream dataInputStream = new DataInputStream(inputStream);
            int fileSizeToReceive = dataInputStream.readInt();
            System.out.println("待接收文件大小为：" + fileSizeToReceive + "字节");

            // 接收文件内容
            FileOutputStream fileOutputStream = new FileOutputStream("example-received.txt");
            BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
            int totalBytesReceived = 0;
            while (totalBytesReceived < fileSizeToReceive) {
                bytesRead = inputStream.read(buffer);
                bufferedOutputStream.write(buffer, 0, bytesRead);
                bufferedOutputStream.flush();
                totalBytesReceived += bytesRead;
            }

            // 关闭连接
            socket.close();
            serverSocket.close();
            fileOutputStream.close();
            bufferedOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

以上代码仅供参考，实际使用时需要根据具体需求进行修改。