JAVA网络编程实现客户端文件的上传和服务器端文件的下载

网络编程

---

• 客户端文件的上传&&服务器端文件的下载
• 服务器端下载成功后向客户端返回文件下载成功的消息

Client

package it.bxh.netCS.upload;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

/*
 * @author  bxh
 * As a client,it sents a file to the server
 */
public class Client {
	public static void main(String[] args) {
		try {
			//获取一个socket对象
			Socket socket = new Socket("127.0.0.1",8888);
			//获取网络字节输出流
			OutputStream os = socket.getOutputStream();
			//客户端获取本地字节输入流
			FileInputStream fis = new FileInputStream("D://qingshu.txt");
			int len=0;
			byte[] byte1=new byte[1024];
			while((len=fis.read(byte1))!=-1)
			{
				os.write(byte1, 0, len);
			}
			//关闭输出流  防止造成死循环
			socket.shutdownOutput();
			
			//接受服务器端的返回信息
			byte[] by=new byte[1024];
			InputStream stream = socket.getInputStream();
			int len1 = stream.read(by);
			System.out.println(new String(by,0,len1));
			
			
			//关闭资源  暂时就在catch的主程序体中关闭
			stream.close();
			fis.close();
			os.close();
			socket.close();
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
}
}

Server

package it.bxh.netCS.upload;

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

/*
 * @author bxh
 * As a server,this program is meant to receive the massage that sent from the client.
 */
public class Server {
	public static void main(String[] args) {
		try {
			//获取serversocket对象
			ServerSocket serverSocket = new ServerSocket(8888);
			//获取到客户端的socket对象
			Socket socket = serverSocket.accept();
			//服务器端获取网络字节输入流
			InputStream is = socket.getInputStream();
			int len=0;
			byte[] by=new byte[1024];
			//获取本地文件输出流
			FileOutputStream fos =new FileOutputStream("F://a.txt");
			
			while((len=is.read(by))!=-1)
			{
				fos.write(by, 0, len);
			}
		
			//获取网络字节输出流，像客户端发送消息
			OutputStream os = socket.getOutputStream();
			os.write("文件下载成功".getBytes());
			
			
			//释放资源   暂时就放在try的结构体中
			os.close();
			fos.close();
			is.close();
			socket.close();
			serverSocket.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}