应用程序正在停止，因为内存使用率过高

时间：2018-03-29 08:58:43

标签： java performance memory ram

每50毫秒我会截取屏幕截图并将其发送到显示屏幕截图的另一台计算机。我正在镜像桌面。现在的问题是程序正在停止，因为内存使用率过高。我的问题是如何“清除”RAM - 我已经用Google搜索并发现我应该使用垃圾收集器，但这不起作用。这是我的代码：

客户端：

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;
  }
}

服务器

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) {
    }
  }
}

几秒后出现异常： 

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)

0 个答案:

没有答案
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