TCP网络通信编程之网络上传文件

【图片】

【思路解析】

【客户端代码】

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

/**
 * @ProjectName: Study
 * @FileName: TCPFileUploadClient
 * @author:HWJ
 * @Data: 2023/7/29 18:44
 */
public class TCPFileUploadClient {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket(InetAddress.getLocalHost(), 8888);
        System.out.println("连接成功...");

        // 这里采用边从数据通道中读取文件信息，边往新文件中写入数据的操作
        String filePath = "e:\\qie.png";
        BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(filePath));
        byte[] bytes = new byte[1024];
        int readSize = 0;
        BufferedOutputStream outputStream = new BufferedOutputStream(socket.getOutputStream());
        while ((readSize = bufferedInputStream.read(bytes)) != -1) {
            outputStream.write(bytes, 0, readSize);
        }
        outputStream.flush();
        socket.shutdownOutput();

        // 这里使用字符流读入
        BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String s = reader.readLine(); // 因为使用了writer.newLine来作为结束标记，所以这里一定要使用readLine来读取
        System.out.println(s);

        // 一定要关闭所有流对象和网络对象
        reader.close();
        bufferedInputStream.close();
        socket.close();
        outputStream.close();
        System.out.println("客户端退出...");

    }
}

【服务端代码】

import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;

/**
 * @ProjectName: Study
 * @FileName: TCPFileUploadServer
 * @author:HWJ
 * @Data: 2023/7/29 18:44
 */
public class TCPFileUploadServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket( 8888);
        System.out.println("服务端，在端口8888，等待连接...");
        // 等待连接
        Socket socket = serverSocket.accept();

        // 这里采用边读取文件信息边往数据通道写入信息的操作
        String newFile = "src\\new.png";
        BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(newFile));
        BufferedInputStream inputStream = new BufferedInputStream(socket.getInputStream());
        byte[] bytes = new byte[1024];
        int readSize = 0;
        while ((readSize = inputStream.read(bytes)) != -1){
            outputStream.write(bytes, 0, readSize);
        }

        // 这里发送的是汉字，所以采用字符流传输
        BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
        bufferedWriter.write("成功收到图片");
        bufferedWriter.newLine();
        bufferedWriter.flush(); // 这里一定要使用flush刷新，来确保数据被写入到数据通道中

        // 一定要关闭所有流对象和网络对象
        outputStream.close();
        bufferedWriter.close();
        inputStream.close();
        serverSocket.close();
        socket.close();
        System.out.println("服务端退出...");
    }
}

【结果展示】