一個例項通過client端和server端通訊

客戶端通過TCP/IP傳輸資原始檔，比如圖片，文字，音訊，視訊等.....

服務端接受到檔案存入本地磁碟，返回接受到：“收到來自於"+s.getInetAddress().getHostName()+"的資訊”

package com.ykw.net;

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

import org.junit.Test;

//TCP程式設計例三:從客戶端傳送檔案給服務端,服務端儲存到本地。並返回"傳送成功"給客戶端。並關閉相應的連線
public class TestTCP3 {

    @Test
    public void client()throws Exception{
        //1.建立Socket的物件
        Socket socket = new Socket(InetAddress.getByName("127.0.0.1"),9898);
        
 
//2.從本地獲取一個檔案傳送給服務端
        OutputStream os = socket.getOutputStream();
        FileInputStream fis = new FileInputStream(new File("1.jpg"));
        byte[] b = new byte[1024];
        int len;
        while((len=fis.read(b))!=-1){
            os.write(b,0,len);
        }
        socket.shutdownOutput();
        
 
//3.接受來自於服務端的資訊
        InputStream is = socket.getInputStream();
        byte[] b1 = new byte[1024];
        int len1;
        while((len1 = is.read(b1))!=-1){
            String str = new String(b1,0,len1);
            System.out.println(str);
        }
        //4.關閉相應的流和Socket物件
        is.close();
        os.close();
        fis.close();
        socket.close();
    }
    
    @Test
    public void server()throws Exception{
        //1.建立一個ServerSocket物件
        ServerSocket ss = new ServerSocket(9898);
        //2.呼叫其accept()方法，返回一個Socket物件
        Socket s = ss.accept();
        //3.將從客戶端傳送過來的資訊儲存到本地
        InputStream is = s.getInputStream();
        FileOutputStream fos = new FileOutputStream(new File("D://5.jpg"));
        byte[] b = new byte[1024];
        int len;
        while((len = is.read(b))!=-1){
            fos.write(b,0,len);
        }
        System.out.println("收到來自於"+s.getInetAddress().getHostAddress()+"的檔案");
        //4.傳送“接收成功”的資訊反饋給客戶端
        OutputStream os = s.getOutputStream();
        os.write("您傳送的圖片我已接收成功".getBytes());
        //5.關閉相應的流和Socket及ServerSocket的物件
        os.close();
        fos.close();
        is.close();
        s.close();
        ss.close();
    }
}