Every 50 Miliseconds I am taking a Screenshot and sending it to another Computer which is showing the Screenshot. I am mirroring the Desktop. Now the problem is the Program is stopping because the Memory usage is getting too high. My Question is how can I "clear" the RAM - I already googled and found out that I should use the Garbage Collector but this isn't working. Here is my code:
CLIENT:
Client.java
import java.awt.AWTException;
import java.awt.Font;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.net.ConnectException;
import java.net.Socket;
import java.net.SocketException;
import javax.imageio.IIOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JOptionPane;
public class Client implements Runnable {
private Socket socket;
private ObjectInputStream din;
private static ObjectOutputStream dout;
public Client(String ip, int port) {
try {
socket = new Socket(ip, port);
din = new ObjectInputStream(socket.getInputStream());
dout = new ObjectOutputStream(socket.getOutputStream());
} catch (ConnectException e) {
JOptionPane.showMessageDialog(null, "Server is offline");
System.exit(0);
} catch (IOException e) {
e.printStackTrace();
}
}
public void run() {
while (true) {
try {
Thread.sleep(50);
Robot robot = new Robot();
Rectangle screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
BufferedImage screenFullImage = robot.createScreenCapture(screenRect);
ImageIO.write(screenFullImage, "jpeg", new File("C:\\Windows\\Temp\\screenshot.jpeg"));
} catch (IOException | AWTException | InterruptedException e) {
e.printStackTrace();
}
ImageIcon ii = new ImageIcon("C:\\Windows\\Temp\\screenshot.jpeg");
send(new Obj(ii));;
}
}
public static void send(Obj obj) {
try {
dout.writeObject(obj);
dout.flush();
} catch (SocketException e) {
JOptionPane.showMessageDialog(null, "Connection closed");
System.exit(0);
} catch (Exception e) {
e.printStackTrace();
}
}
public void close() {
try {
dout.close();
din.close();
socket.close();
} catch (IOException e) {
}
}
}
Main.java
public class Main {
public static void main(String[] args) {
// Connect to the Server
Client client = new Client("localhost", 9785);
// Runs a new Client
Thread clientThread = new Thread(client);
clientThread.start();
}
}
Obj.java
package ch.nyp.blj;
import java.io.Serializable;
import javax.swing.ImageIcon;
public class Obj implements Serializable {
private ImageIcon img;
public Obj(ImageIcon img) {
super();
this.img = img;
}
public ImageIcon getImg() {
return img;
}
public void setImg(ImageIcon img) {
this.img = img;
}
}
SERVER:
Main.java
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
GUI.open();
try {
ServerSocket s = new ServerSocket(9785);
System.out.println("Server Online");
while (true) {
Socket client = s.accept();
if (client != null) {
ClientThread ct = new ClientThread(client);
new Thread(ct).start();
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
Obj.java
import java.io.Serializable;
import javax.swing.ImageIcon;
public class Obj implements Serializable {
private ImageIcon img;
public Obj(ImageIcon img) {
super();
this.img = img;
}
public ImageIcon getImg() {
return img;
}
public void setImg(ImageIcon img) {
this.img = img;
}
}
GUI.java
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JLabel;
public class GUI {
public static JLabel img;
private JFrame frame;
public static Dimension d = new Dimension(400, 400);
/**
* Launch the application.
*/
public static void open() {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
GUI window = new GUI();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public GUI() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setSize(d.width, d.height);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
img = new JLabel("");
GroupLayout groupLayout = new GroupLayout(frame.getContentPane());
groupLayout.setHorizontalGroup(
groupLayout.createParallelGroup(Alignment.LEADING)
.addComponent(img, GroupLayout.DEFAULT_SIZE, 1924, Short.MAX_VALUE)
);
groupLayout.setVerticalGroup(
groupLayout.createParallelGroup(Alignment.LEADING)
.addComponent(img, GroupLayout.DEFAULT_SIZE, 1181, Short.MAX_VALUE)
);
frame.getContentPane().setLayout(groupLayout);
}
}
ClientThread.java
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.net.SocketException;
public class ClientThread implements Runnable {
private Socket socket;
private ObjectOutputStream dout;
private ObjectInputStream din;
private static Obj input = null;
ClientThread(Socket socket) {
this.socket = socket;
try {
this.dout = new ObjectOutputStream(socket.getOutputStream());
this.din = new ObjectInputStream(socket.getInputStream());
} catch (IOException e) {
e.printStackTrace();
Thread.currentThread().interrupt();
}
}
@Override
public void run() {
try {
while (true) {
try {
input = (Obj) din.readObject();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
GUI.img.setIcon(input.getImg());
System.out.println(input.getImg());
}
} catch (SocketException e) {
Thread.currentThread().interrupt();
} catch (IOException e) {
}
}
}
Exception after some seconds:
Exception in thread "Thread-0" java.lang.OutOfMemoryError: Java heap space
at java.base/java.lang.reflect.Array.newArray(Native Method)
at java.base/java.lang.reflect.Array.newInstance(Unknown Source)
at java.base/java.io.ObjectInputStream.readArray(Unknown Source)
at java.base/java.io.ObjectInputStream.readObject0(Unknown Source)
at java.base/java.io.ObjectInputStream.readObject(Unknown Source)
at java.desktop/javax.swing.ImageIcon.readObject(Unknown Source)
at java.base/jdk.internal.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at java.base/java.io.ObjectStreamClass.invokeReadObject(Unknown Source)
at java.base/java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.base/java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.base/java.io.ObjectInputStream.readObject0(Unknown Source)
at java.base/java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.base/java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.base/java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.base/java.io.ObjectInputStream.readObject0(Unknown Source)
at java.base/java.io.ObjectInputStream.readObject(Unknown Source)
at ch.nyp.blj.ClientThread.run(ClientThread.java:31)
at java.base/java.lang.Thread.run(Unknown Source)
