7.TCP文件上传实现

先把文件复制到根目录：

girl.jpg

 客户端：

package com.Inet.lesson2;

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

public class TcpClientDemo02 {
    public static void main(String[] args) throws Exception {
        //1.创建一个Socket连接
        Socket socket = new Socket(InetAddress.getByName("127.0.0.1"), 9000);
        //2.创建一个输出流
        OutputStream os = socket.getOutputStream();
        //3.读取文件
        FileInputStream fis = new FileInputStream(new File("girl.jpg"));
        //4.写出文件
        byte[] buf = new byte[1024];
        int len;
        while ((len = fis.read(buf)) != -1) {
            os.write(buf, 0, len);
        }

        //通知服务器，我已经结束了
        socket.shutdownOutput();//我已经传输完了

        //确定服务器接收完毕，才能够断开连接
        InputStream inputStream = socket.getInputStream();
        //String byte[]
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        byte[] buf2 = new byte[1024];
        int len2;
        while ((len2 = inputStream.read(buf2)) != -1) {
            baos.write(buf2, 0, len2);
        }
        System.out.println(baos.toString());

        //5.关闭资源,先开后关
        baos.close();
        inputStream.close();
        fis.close();
        os.close();
        socket.close();
    }
}

服务器端：

package com.Inet.lesson2;

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

public class TcpServerDemo02 {
    public static void main(String[] args) throws Exception {
        //1.创建服务
        ServerSocket serverSocket = new ServerSocket(9000);
        //2.监听客户端的连接
        Socket socket = serverSocket.accept();//阻塞式监听，会一直监听(等待客户端连接)
        //3.获取输入流
        InputStream is = socket.getInputStream();

        //4.文件输出
        FileOutputStream fos = new FileOutputStream(new File("receive.jpg"));

        byte[] buffer = new byte[1024];
        int len;
        while ((len = is.read(buffer)) != -1) {
            fos.write(buffer, 0, len);
        }

        //通知客户端我接收完毕了
        OutputStream os = socket.getOutputStream();
        os.write("我接受完毕了，你可以断开了".getBytes());

        //关闭资源
        fos.close();
        is.close();
        socket.close();
        serverSocket.close();

    }
}

测试：

1.先开服务器端，等待接收

2.打开客户端