第四周第一天（【URL(openStream()】【基于UDP的网络通信】）

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基于UDP的网络通信

package com.day1_2015_8_3;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Scanner;public class MySendTest {    public static void main(String[] args) {        try {            DatagramSocket send = new DatagramSocket();            // DatagramSocket此类表示用来发送和接收数据报包的套接字。            DatagramSocket receive = new DatagramSocket(8088);            Scanner scanner = new Scanner(System.in);            byte[] ReceiveArray = new byte[1024];            while (true) {                Calendar rightNow =Calendar.getInstance();                SimpleDateFormat format=new SimpleDateFormat("yyyy年MM月dd日  HH:mm:ss");                String time = format.format(rightNow.getTime());                System.out.print(time+"\n小明说:");                                String s = scanner.next();                byte[] array = s.getBytes();                DatagramPacket dp = new DatagramPacket(array, array.length, InetAddress.getLocalHost(), 8080);    // DatagramPacket此类表示数据报包。    // public DatagramPacket(byte[] buf,int length,InetAddress    // address,int port)构造数据报包，    // 用来将长度为 length 的包发送到指定主机上的指定端口号。length 参数必须小于等于 buf.length。                send.send(dp);                DatagramPacket packetRecive = new DatagramPacket(ReceiveArray, 1024, InetAddress.getLocalHost(), 8080);                receive.receive(packetRecive);                byte[] data = packetRecive.getData();                System.out.println(time +"\n小红说:" + new String(data, 0, packetRecive.getLength()));            }        } catch (SocketException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}//******************************/package com.day1_2015_8_3;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Scanner;public class MyReceiveTest {    public static void main(String[] args) {        try {            DatagramSocket receive = new DatagramSocket(8080);            DatagramSocket send = new DatagramSocket();            Scanner scanner = new Scanner(System.in);            byte[] array = new byte[1024];            while (true) {                Calendar rightNow =Calendar.getInstance();                SimpleDateFormat format=new SimpleDateFormat("yyyy年MM月dd日  HH:mm:ss");                String time = format.format(rightNow.getTime());                DatagramPacket dp = new DatagramPacket(array, 1024,InetAddress.getLocalHost(), 8088);                receive.receive(dp);                byte[] data = dp.getData();                System.out.println(time+"\n小明说:"+ new String(data, 0, dp.getLength()));                System.out.print(time+"\n小红说:");                String s = scanner.next();                byte[] sendByte = s.getBytes();                DatagramPacket ps = new DatagramPacket                        (sendByte, sendByte.length, InetAddress.getLocalHost(), 8088);                send.send(ps);            }        } catch (SocketException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}

URL(openStream()网址)

//*****************URL(openStream())*********************/package com.day1_2015_8_3;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.MalformedURLException;import java.net.URL;public class TestURL {   public static void main(String[] args) {    try {        URL url = new URL("http://www.baidu.com");        InputStream is = url.openStream();        BufferedReader br= new BufferedReader(new InputStreamReader(is));        String line = br.readLine();        while(line!=null){            System.out.println(line);            line = br.readLine();        }        br.close();        is.close();    } catch (MalformedURLException e) {        // TODO Auto-generated catch block        e.printStackTrace();    } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }}}//***************URL（openStream()图片）*********************/package com.day1_2015_8_3;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.MalformedURLException;import java.net.URL;public class TestURL2 {public static void main(String[] args) {    try {        URL url = new URL("http://pic17.nipic.com/20111026/2487606_163354654187_2.jpg");        File file = new File("d:\\11.jpg");        if(!file.exists()){//file.exists()判断文件是否存在            file.createNewFile();//不存在创建一个新的文件        }        OutputStream os = new FileOutputStream(file);        InputStream is = url.openStream();        byte[] array = new byte[1024];        int i = is.read(array);        while(i!=-1){            os.write(array,0,i);            i=is.read(array);        }        os.flush();        os.close();        is.close();    } catch (MalformedURLException e) {        // TODO Auto-generated catch block        e.printStackTrace();    } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }}}

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