网络编程屏幕广播之学生端

小黑哎代码
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字节转换工具类
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package cn.itcast.screenbroadcast;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
import javax.imageio.ImageIO;
public class Util {
//
private static Robot robot ;
//
static{
try {
robot = new Robot();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* ץͼ
*/
public static byte[] captureScreen(){
try {
BufferedImage image = robot.createScreenCapture(new Rectangle(0, 0, 1366, 768));
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(image, "jpg", baos);
return baos.toByteArray();
} catch (Exception e) {
e.printStackTrace();
}
return null ;
}
public static byte[] long2Bytes(long l){
byte[] bytes = new byte[8] ;
bytes[0] = (byte)l ;
bytes[1] = (byte)(l >> 8) ;
bytes[2] = (byte)(l >> 16) ;
bytes[3] = (byte)(l >> 24) ;
bytes[4] = (byte)(l >> 32) ;
bytes[5] = (byte)(l >> 40) ;
bytes[6] = (byte)(l >> 48) ;
bytes[7] = (byte)(l >> 56) ;
return bytes ;
}
public static long byte2Long(byte[] bytes){
return ((long)(bytes[0] & 0xFF))
| ((long)(bytes[1] & 0xFF) << 8)
| ((long)(bytes[2] & 0xFF) << 16)
| ((long)(bytes[3] & 0xFF) << 24)
| ((long)(bytes[4] & 0xFF) << 32)
| ((long)(bytes[5] & 0xFF) << 40)
| ((long)(bytes[6] & 0xFF) << 48)
| ((long)(bytes[7] & 0xFF) << 56);
}
public static byte[] int2Bytes(int l){
byte[] bytes = new byte[8] ;
bytes[0] = (byte)l ;
bytes[1] = (byte)(l >> 8) ;
bytes[2] = (byte)(l >> 16) ;
bytes[3] = (byte)(l >> 24) ;
return bytes ;
}
public static int bytes2Int(byte[] bytes){
return ((bytes[0] & 0xFF))
| ((bytes[1] & 0xFF) << 8)
| ((bytes[2] & 0xFF) << 16)
| ((bytes[3] & 0xFF) << 24);
}
public static int byte2Int(byte[] bytes,int offset){
return ((bytes[0 + offset] & 0xFF))
| ((bytes[1 + offset] & 0xFF) << 8)
| ((bytes[2 + offset] & 0xFF) << 16)
| ((bytes[3 + offset] & 0xFF) << 24);
}
public static byte[] zipData(byte[] rawData) {
try {
//
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ZipOutputStream zos = new ZipOutputStream(baos);
zos.putNextEntry(new ZipEntry("one"));
zos.write(rawData);
zos.close();
return baos.toByteArray();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static byte[] unzipData(byte[] zipData) {
try {
//
ByteArrayInputStream bais = new ByteArrayInputStream(zipData);
ZipInputStream zis = new ZipInputStream(bais);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
zis.getNextEntry();
byte[] buf = new byte[1024];
int len = 0 ;
while((len = zis.read(buf)) != -1){
baos.write(buf, 0, len);
}
zis.close();
bais.close();
baos.close();
return baos.toByteArray();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
界面
[AppleScript]
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package cn.itcast.screenbroadcast;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
/**
* StudentUI
*/
public class StudentUI extends JFrame{
private JLabel lblIcon ;
public StudentUI(){
init();
}
private void init() {
this.setTitle("yqw广播");
this.setBounds(0, 0, 1366, 768);
this.setLayout(null);
lblIcon = new JLabel();
lblIcon.setBounds(0, 0, 1366, 768);
ImageIcon icon = new ImageIcon("D:/Koala.jpg");
lblIcon.setIcon(icon);
this.add(lblIcon);
this.setVisible(true);
}
public void updateIcon(byte[] dataBytes){
ImageIcon icon = new ImageIcon(dataBytes);
lblIcon.setIcon(icon);
}
}

数据接收类
[AppleScript]
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package cn.itcast.screenbroadcast;
import java.io.ByteArrayOutputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.util.HashMap;
import java.util.Map;
public class Receiver extends Thread {
private DatagramSocket sock ;
private DatagramPacket pack ;
private byte[] buf = new byte[Teacher.FRAME_UNIT_MAX + 14];
//
private Map<Integer, FrameUnit> unitMap = new HashMap<Integer,FrameUnit>();
//
private StudentUI ui;
public Receiver(StudentUI ui){
try {
this.ui = ui ;
sock = new DatagramSocket(8888);
pack = new DatagramPacket(buf, buf.length);
} catch (Exception e) {
e.printStackTrace();
}
}
public void run() {
try {
long currentFrameId = 0 ;
while(true){
sock.receive(pack);
int len = pack.getLength();
//ת����֡��Ԫ
FrameUnit funit = convertData2FrameUnit(buf,0,len);
long newFrameId = funit.getFrameId();
//ͬһframe
if(newFrameId == currentFrameId){
unitMap.put(funit.getUnitNo(), funit);
}
//��frame
else if(newFrameId > currentFrameId){
currentFrameId = newFrameId ;
unitMap.clear();
unitMap.put(funit.getUnitNo(), funit);
}
processFrame();
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* ��������unit����
*/
private void processFrame() {
try {
//�õ�Frame���ܵ�unit����
int unitCont = unitMap.values().iterator().next().getUnitCont();
if(unitMap.size() == unitCont ){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
for(int i = 0 ; i < unitCont ; i ++){
FrameUnit fu = unitMap.get(i);
fu.getData();
baos.write(fu.getData());
}
unitMap.clear();
//
ui.updateIcon(Util.unzipData(baos.toByteArray()));
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* ת��ÿ��packΪFrameunit
*/
private FrameUnit convertData2FrameUnit(byte[] buf2, int i, int len) {
byte[] data = new byte[len];
System.arraycopy(buf2, 0, data, 0, len);
FrameUnit unit = new FrameUnit();
unit.setFrameId(Util.byte2Long(data));
unit.setUnitCont(data[8]);
unit.setUnitNo(data[9]);
unit.setDateLen(Util.byte2Int(data,10));
byte[] frameUnitBytes = new byte[unit.getDateLen()];
System.arraycopy(buf2, 14, frameUnitBytes, 0, unit.getDateLen());
unit.setData(frameUnitBytes);
return unit;
}
}

app 程序入口
[AppleScript]
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package cn.itcast.screenbroadcast;
/**
* ���ܷ�
*
*/
public class Student {
public static void main(String[] args) {
StudentUI ui = new StudentUI();
new Receiver(ui).start();
}
}

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