Eclipse下内存溢出错误(OutOfMemoryError)

文章出处：http://www.cnblogs.com/skyblue/p/3371729.html

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。

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();}}