题目

• 客户端：将本地文件上传到服务器，接收服务器的反馈
• 服务端：接收客户端上传的文件，上传完毕之后给出反馈

代码实战

1、客户端代码

package com.heima;

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

public class Client {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1",10000);

        //读取本地文件中的数据，并写到服务器中
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("G:\\wjkwk\\clientdir\\123.jpg"));
        BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());
        byte[] bytes = new byte[1024];
        int len;
        while ((len = bis.read(bytes)) != -1){
            bos.write(bytes,0,len);
        }

        //往服务器写结束标记
        socket.shutdownOutput();

        //接收服务器返回的数据
        BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String line = br.readLine();
        System.out.println(line);
        socket.close();
    }
}

2、服务端代码

package com.heima;

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

public class Server {

    public static void main(String[] args) throws IOException {

        ServerSocket serverSocket = new ServerSocket(10000);
        //等待客户端来连接
        Socket socket = serverSocket.accept();
        //读取客户端上传的文件并保存到本地
        BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());
        String name = UUID.randomUUID().toString().replace("-", "");
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("G:\\wjkwk\\serverdir\\"+name+".jpg"));
        int len;
        byte[] bytes = new byte[1024];
        while ((len = bis.read(bytes)) != -1){
            bos.write(bytes,0,len);
        }
        //回写数据
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
        bw.write("上传成功");
        bw.newLine();
        bw.flush();

        //释放资源
        socket.close();
        serverSocket.close();
    }
}

3、运行结果