【计算机网络 15】简单几行Java代码实现迅雷功能，java流式编程原理

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(“01.png”));

//4、写入文件

byte[] buffer = new byte[1024];

int len;

while ((len=fis.read(buffer))!=-1){

os.write(buffer,0,len);

}

//5.关闭资源

fis.close();

os.close();

socket.close();

}

}

3、测试

三、UDP实现数据上传

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1、UDP接收端

package com.tcpip;

import java.DatagramPacket;

import java.DatagramSocket;

public class UdpServerTest {

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

//1、开放端口

DatagramSocket socket = new DatagramSocket(9090);

//2、接收数据包

byte[] buffer = new byte[1024];

DatagramPacket packet = new DatagramPacket(buffer,0,buffer.length);

socket.receive(packet);

System.out.println(new String(packet.getData(),0,packet.getData().length));

//3、关闭连接

socket.close();

}

}

2、UDP发送端

package com.tcpip;

import java.DatagramPacket;

import java.DatagramSocket;

import java.InetAddress;

public class UdpClientTest {

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

//1、建立一个socket

DatagramSocket socket = new DatagramSocket();

//2、建个包

String msg = “UDP 测试”;

InetAddress localhost = InetAddress.getByName(“localhost”);

int port = 9090;

DatagramPacket packet = new DatagramPacket(msg.getBytes(),0,msg.getBytes().length,localhost,port);

//3、发送包

socket.send(packet);

//4、关闭资源

socket.close();

}

}

3、测试

四、UDP实现多线程在线咨询

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1、发送端

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package com.tcpip;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.DatagramPacket;

import java.DatagramSocket;

import java.InetSocketAddress;

import java.SocketException;

public class TalkSend implements Runnable {

DatagramSocket socket = null;

BufferedReader reader = null;

private int fromPort;

private String toIP;

private int toPort;

public TalkSend(int fromPort, String toIP, int toPort) {

this.fromPort = fromPort;

this.toIP = toIP;

this.toPort = toPort;

try {

socket = new DatagramSocket(fromPort);

reader = new BufferedReader(new InputStreamReader(System.in));

} catch (SocketException e) {

e.printStackTrace();

}

}

@Override

public void run() {

while (true){

String data = null;

try {

data = reader.readLine();

byte[] datas = data.getBytes();

DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress(this.toIP,this.toPort));

socket.send(packet);

if(data.equals(“bye”)){

break;

}

} catch (IOException e) {

e.printStackTrace();

}

}

socket.close();

}

}

2、接收端

package com.tcpip;

import java.io.IOException;

import java.DatagramPacket;

import java.DatagramSocket;

import java.SocketException;

public class TalkReceive implements Runnable{

DatagramSocket socket = null;

private int port;

private String msgFrom;

public TalkReceive(int port, String msgFrom) {

this.port = port;

this.msgFrom = msgFrom;

try {

socket = new DatagramSocket(port);

} catch (SocketException e) {

e.printStackTrace();

}

}

@Override

public void run() {

while (true){

try {

//准备接收包裹

byte[] container = new byte[1024];

DatagramPacket packet = new DatagramPacket(container,0,container.length);

//阻塞式接收包裹

socket.receive(packet);

//断开连接bye

byte[] data = packet.getData();

String receiveData = new String(data,0,data.length);

System.out.println(msgFrom + “:” + receiveData);

if(receiveData.equals(“bye”)){

break;

}

} catch (IOException e) {

e.printStackTrace();

}

}

socket.close();

}

}

3、学生

package com.tcpip;

public class TalkStudent {

public static void main(String[] args) {

new Thread(new TalkSend(7777,“localhost”,9999)).start();

new Thread(new TalkReceive(8888,“老师”)).start();

}

}

4、老师

package com.tcpip;

public class TalkTeacher {

public static void main(String[] args) {

new Thread(new TalkSend(5555,“localhost”,8888)).start();

new Thread(new TalkReceive(9999,“学生”)).start();

}

}

5、开始聊天啦，模拟请假

五、Java下载URL网络资源（图片、音乐、视频、电影）

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一、前言

今天学习了一下FTP/IP的相关知识，发现一个强大的功能，用Java下载URL网络资源，据说收费的也能下！ 学编程真好，Java真好。

二、代码实例

package com.tcpip;

import java.io.FileOutputStream;

import java.io.InputStream;