基于UDP用JAVA实现客户端和服务端通信

package netTCP;

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

public class Clinet {

    public static void main(String args[]) throws IOException {
        //获取文本内容，得到目标文件的路径
        String filepathtoUpload = getPath();
        System.out.println("获得要上传的文件所在路径是: "+filepathtoUpload);

        //定义客户端端口（目的ip,目的端口）
        Socket socket = new Socket("127.0.0.1",9991);

        //定义缓冲输入流，准备读入图片的字节缓冲数组
        BufferedInputStream bi = new BufferedInputStream(new FileInputStream(filepathtoUpload));
        byte[] buffpic= new byte[1024];
        int len;

        //获取客户端发送流，做包装；一边读图片字节数据，一边发送
        OutputStream out = socket.getOutputStream();
        BufferedOutputStream bos = new BufferedOutputStream(out);
        while((len = bi.read(buffpic))!=-1){
            bos.write(buffpic,0,len);
        }
        bos.flush();//刷新缓存
        socket.shutdownOutput();//禁用此套接字的输出流，可以使服务器端的InputStream不在阻塞

        //获取客户端输入流，接受文件上传后反馈信息
        InputStream in = socket.getInputStream();
        byte [] feedBack = new byte[1024];
        int lenfeedBack = in.read(feedBack);
        System.out.println(new String(feedBack,0,lenfeedBack));

        //收到反馈信息后，关闭套接字socket
        socket.close();
        bi.close();
    }


    public static String getPath() throws IOException {
        FileInputStream fileInputStream = new FileInputStream("G:\\JavaTestDir\\路径有中文\\config.properties");
        byte[] buffer = new byte[1024];
        int len = fileInputStream.read(buffer);
        String s = new String(buffer,0,len);
        return s;

    }

}

package netTCP;

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

public class Server {
   public static void main(String args[]) throws IOException {
       //定义服务端SeverSocker,并获取服务端连接的socket
       ServerSocket serverSocket = new ServerSocket(9991);
       Socket socket = serverSocket.accept();

       //获取socket输入流，并用缓存字节流包装；
       InputStream in = socket.getInputStream();
       BufferedInputStream bis = new BufferedInputStream(in);

       //指定一个路径(这里用默认路径)，定义缓冲输出流，用于将图片保存到默认路径
       FileOutputStream fo = new FileOutputStream("copy.jpg");
       BufferedOutputStream bos = new BufferedOutputStream(fo);

       //接收客户端的数据,并写到指定位置
       byte[] buff = new byte[1024];
       int len = 0;
       while((len = bis.read(buff))!=-1){
            bos.write(buff,0,len);
       }
        bos.flush();

       //获取socket输出流
       OutputStream out = socket.getOutputStream();
       //返回文件上传结束信息给客户端（中文）
       String feedbackMessage ="文件上传结束";
       out.write(feedbackMessage.getBytes());

       //out.close();//可不用，由客户端关闭socket即可
       fo.close();
      // in.close();//可不用，有客户端关闭socket即可
       socket.close();
       serverSocket.close();;
   }

}