Files 和 Path SocketServer Socket 写一个 服务端发送文件1.jpg 和 客户端接收文件，并保存为2.jpg 用 java写

以下是一个简单的 Java 文件传输服务器和客户端示例，使用了 Files、Path、SocketServer 和 Socket 类：

服务端（Server）代码：

import java.io.*;
import java.net.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Server {
    public static void main(String[] args) {
        try {
            ServerSocket serverSocket = new ServerSocket(1234);
            System.out.println("Server is running and waiting for connection...");

            Socket socket = serverSocket.accept();
            System.out.println("Client connected.");

            InputStream inputStream = socket.getInputStream();

            // 读取文件名
            byte[] fileNameBytes = new byte[1024];
            int fileNameLength = inputStream.read(fileNameBytes);
            String fileName = new String(fileNameBytes, 0, fileNameLength);
            System.out.println("Received file name: " + fileName);

            // 读取文件内容
            byte[] fileContentBytes = new byte[1024];
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            int bytesRead;
            while ((bytesRead = inputStream.read(fileContentBytes)) != -1) {
                byteArrayOutputStream.write(fileContentBytes, 0, bytesRead);
            }
            byteArrayOutputStream.flush();

            // 保存文件
            Path outputFilePath = Paths.get("2.jpg");
            Files.write(outputFilePath, byteArrayOutputStream.toByteArray());
            System.out.println("File saved as: " + outputFilePath.toAbsolutePath().toString());

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

客户端（Client）代码：

import java.io.*;
import java.net.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Client {
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("localhost", 1234);
            System.out.println("Connected to server.");

            OutputStream outputStream = socket.getOutputStream();

            // 发送文件名
            String fileName = "1.jpg";
            byte[] fileNameBytes = fileName.getBytes();
            outputStream.write(fileNameBytes);
            outputStream.flush();
            System.out.println("Sent file name: " + fileName);

            // 发送文件内容
            Path inputFilePath = Paths.get(fileName);
            byte[] fileContentBytes = Files.readAllBytes(inputFilePath);
            outputStream.write(fileContentBytes);
            outputStream.flush();
            System.out.println("Sent file content.");

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

这个代码简单的示例只传输了一个图片文件，你可以根据需求修改代码来传输其他类型的文件或传输多个文件。