Eclipse下内存溢出错误(OutOfMemoryError)

写了一个图片缩放程序，当图片尺寸过大时会报错：

Exception in thread "Image Fetcher 0" java.lang.OutOfMemoryError: Java heap space

解决方法：

在Eclipse里选：Window->Preference->Installed JREs->Edit(选中jre)，

在Default VM Arguments里输入-Xms256m -Xmx1024m，表示最小内存256M，最大1G，然后运行就可以了。

程序源码ImageBrowser.java ：

import java.awt.Container;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;

public class ImageBrowser extends JFrame {
private static final long serialVersionUID = 1L;

JLabel lab = new JLabel();
JFileChooser chooser = new JFileChooser();
private String filePath;
private int height;
private int width;
private final double ratio = 0.2;
public ImageBrowser() {
   initial();
   setTitle("Image Browser --- No image");
   setSize(600, 400);
   setLocation(200, 150);
   setVisible(true);
   setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);  

}
public void initial() {
   // Create Menu
   JMenuBar menuBar = new JMenuBar();
   setJMenuBar(menuBar);

   JMenu menu1 = new JMenu("File");
   JMenu menu2 = new JMenu("Edit");
   menuBar.add(menu1);
   menuBar.add(menu2);
   JMenuItem openItem = new JMenuItem("Open");
   menu1.add(openItem);
   openItem.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
     chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
        int r = chooser.showOpenDialog(null);
        if(r == JFileChooser.APPROVE_OPTION)
        {
         filePath = chooser.getSelectedFile().getPath();
         setTitle("Image Browser --- " + filePath);
         spread();
        }
    }
   });
   JMenuItem spreadItem = new JMenuItem("Spread");
   menu2.add(spreadItem);
   spreadItem.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
     spread();
    }
   });

   JMenuItem resumeItem = new JMenuItem("Resume");
   menu2.add(resumeItem);
   resumeItem.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
     resume();
    }
   });

   JMenuItem largeItem = new JMenuItem("Large");
   menu2.add(largeItem);
   largeItem.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
     height = (int)(height*(1+ratio));
     width = (int) (width*(1+ratio));
     lab.setIcon(getFixedBoundIcon());
    }
   });

   JMenuItem reduceItem = new JMenuItem("Reduce");
   menu2.add(reduceItem);
   reduceItem.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
     height = (int)(height*(1-ratio));
     width = (int) (width*(1-ratio));
     lab.setIcon(getFixedBoundIcon());
    }
   });

   JMenuItem exitItem = new JMenuItem("Exit");
   menu1.add(exitItem);
   exitItem.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
     System.exit(0);
    }
   });

   Container contentPane = getContentPane();
   JScrollPane sc = new JScrollPane(lab);
   contentPane.add(sc);
}
public void spread() {
   File file = new File(filePath);
   Icon ic = new ImageIcon(file.getAbsoluteFile().toString());
   int icHeight = ic.getIconHeight();
   int icWidth = ic.getIconWidth();
   Container contentPane = getContentPane();
   height = contentPane.getHeight();
   width = contentPane.getWidth();
   if((double)height/width>=(double)icHeight/icWidth)
    height = (int)(width*(double)icHeight/icWidth);
   else
    width = (int)(height*(double)icWidth/icHeight);
   lab.setIcon(getFixedBoundIcon());
}
public void resume() {
   try {
    Icon ic = new ImageIcon(filePath);
    height = ic.getIconHeight();
    width = ic.getIconWidth();
    lab.setIcon(ic);
   }
   catch(Exception e) {
    e.printStackTrace();
   }
}

public Icon getFixedBoundIcon(){
   double Ratio=0.0; //缩放比例
   try {
    File F = new File(filePath);
    Icon ret = new ImageIcon(filePath);
    BufferedImage Bi = ImageIO.read(F);
    if(1==1) { // ((Bi.getHeight()>height) || (Bi.getWidth()>width)) {
     if (Bi.getHeight()>Bi.getWidth()){
      Ratio = (new Integer(height)).doubleValue() /Bi.getHeight();
     } else {
      Ratio = (new Integer(width)).doubleValue()/Bi.getWidth();
     }
     File ThF = new File(filePath+"_"+height +"_"+width);
     Image Itemp = Bi.getScaledInstance (width,height,Image.SCALE_SMOOTH);
     AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(Ratio, Ratio), null);
     Itemp = op.filter(Bi, null);
     ImageIO.write((BufferedImage)Itemp, "jpg", ThF);
     ret = new ImageIcon(ThF.getPath());
    }
    return ret;
   }
   catch (Exception ex) {
    ex.printStackTrace();
   }
   return null;
}
public static void main(String[] args) {
   new ImageBrowser();
}
}