上传服务器（多线程）

package demo05;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Random;

public class UPload implements Runnable {
    private Socket s;
    private FileOutputStream fos;

    public UPload(Socket s) {
        this.s = s;
    }

    public void run() {
        try {
            // 3.获取输入流
            InputStream in = s.getInputStream();
            // 4.获取文件夹，如果不存在就创建
            File f = new File("f:\\aaa");
            if (!f.exists()) {
                f.mkdirs();
            }
            // 5.创建文件输出流
            String filename = "oracle" + System.currentTimeMillis() + new Random().nextInt(99999) + ".png";
            fos = new FileOutputStream(f + File.separator + filename);
            // 6.写入数据
            byte[] b = new byte[1024];
            int len = 0;
            while ((len = in.read(b)) != -1) {
                fos.write(b, 0, len);
            }

            // 服务器给客服端回复（上传成功）
            OutputStream out = s.getOutputStream();
            out.write("上传成功".getBytes());

        } catch (Exception ex) {

            ex.printStackTrace();

        } finally {

            try {
                // 释放资源
                fos.close();
                s.close();
            } catch (IOException e) {

                e.printStackTrace();
            }

        }

    }

}

package demo05;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class test {
    public static void main(String[] args) throws IOException {
        ServerSocket ser =new ServerSocket(8888);
        while(true){
        Socket s =ser.accept();
        UPload u =new UPload(s);
        Thread t =new Thread(u);
        t.start();
        }

    }
}

原文地址：https://www.cnblogs.com/Jxliu/p/9253430.html