socket简单示例实现从服务器拷贝文件到客户端

　读写工具类

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;

public class MyUtil {
    /**
     *
     * @param bis 缓存字节输入流
     * @param bos 缓存字节输出流
     * @throws IOException 抛出异常，IO流读写过程中可能发生异常
     */
    public static void readAndWriter(BufferedInputStream bis, BufferedOutputStream bos) throws IOException {
        // 定义长度为1024的字节数组
        byte [] bytes = new byte [1024];
        int c = 0;
        while((c = bis.read(bytes))!=-1){//组合式写法
            //写入到文件
            bos.write(bytes, 0, c);
        }
        //关闭流，一定要关闭流，节约资源
        bos.close();
        bis.close();
    }
}


服务器

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class MyServer {
    public static void main(String[] args) throws IOException {
        //1.创建server，自定义端口号
        ServerSocket server = new ServerSocket(1689);
        //2.监听
        Socket socket = server.accept();
        //3.通过socket读取网络文件
        BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());
        //4.写入到本地文件
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("E:/1.txt"));
        //5.边读边写
        //读取的中转站
        MyUtil.readAndWriter(bis,bos);
    }
}


客户端

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;

public class MyClient {
    public static void main(String[] args) throws IOException {
        // 创建socket和server进行连接，连接服务器的端口号
        Socket socket = new Socket(InetAddress.getLocalHost(),1689);
        // 读取文件
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("F:/Music/A Fine Keturns-- 《New World M.mp3"));
        // 写入到网络中
        BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());
        MyUtil.readAndWriter(bis,bos);
    }
}