应该是路径问题。
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把你要显示的图片放在你的Test类里，
再把 ：con = new ImageIcon("D:\\java程序\\1.jpg");
改成 ： icon = new ImageIcon("./1.jpg");
你试试，看行不。
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class ImageZipUtil {
/**
* 压缩图片文件br
* 先保存原文件，再压缩、上传
*
* @param oldFile
* 要进行压缩的文件全路径
* @param width
* 宽度
* @param height
* 高度
* @param quality
* 质量
* @param smallIcon
* 小图片的后缀
* @return 返回压缩后的文件的全路径
*/
public String zipImageFile(String oldFile, int width, int height,
float quality, String smallIcon) {
if (oldFile == null) {
return null;
}
String newImage = null;
try {
/** 对服务器上的临时文件进行处理 */
Image srcFile = ImageIO.read(new File(oldFile));
int w = srcFile.getWidth(null);
System.out.println(w);
System.out.println(smallIcon);
System.out.println(smallIcon);
int h = srcFile.getHeight(null);
System.out.println(h);
//width = w/4;
//height = h/4;
/** 宽,高设定 */
BufferedImage tag = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(srcFile, 0, 0, width, height, null);
String filePrex = oldFile.substring(0, oldFile.indexOf('.'));
/** 压缩后的文件名 */
newImage = filePrex + smallIcon
+ oldFile.substring(filePrex.length());
/** 压缩之后临时存放位置 */
FileOutputStream out = new FileOutputStream(newImage);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);
/** 压缩质量 */
jep.setQuality(quality, true);
encoder.encode(tag, jep);
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return newImage;
}
/**
* 保存文件到服务器临时路径
*
* @param fileName
* @param is
* @return 文件全路径
*/
public String writeFile(String fileName, InputStream is) {
if (fileName == null || fileName.trim().length() == 0) {
return null;
}
try {
/** 首先保存到临时文件 */
FileOutputStream fos = new FileOutputStream(fileName);
byte[] readBytes = new byte[512];// 缓冲大小
int readed = 0;
while ((readed = is.read(readBytes)) 0) {
fos.write(readBytes, 0, readed);
}
fos.close();
is.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return fileName;
}
public static void main(String[] args){
ImageZipUtil u = new ImageZipUtil();
u.zipImageFile("e:/SAM_0006.JPG", 128, 128, 1f, "x2");
}
}
java实现图形的放大和缩小，其实就是在画图时，改变图片的长和宽。以下代码参考一下：
import java.awt.Graphics;
import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.filechooser.FileNameExtensionFilter;
public class App extends JFrame implements MouseListener, ActionListener {
int x = 0;
int y = 0;
File[] selectedFiles = null;
int fileIndex = 0;
int width = 200;
int height = 200;
public App() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setSize(400, 300);
setResizable(false);
getContentPane().setLayout(null);
JPanel panel = new ImagePanel();
panel.setBounds(12, 40, 370, 218);
getContentPane().add(panel);
addMouseListener(this);
JButton btnBrowse = new JButton("Browse");
btnBrowse.addActionListener(this);
btnBrowse.setBounds(12, 9, 91, 21);
getContentPane().add(btnBrowse);
setVisible(true);
}
public static void main(String[] args) {
new App();
}
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
chooser.setMultiSelectionEnabled(true);
FileNameExtensionFilter filter = new FileNameExtensionFilter(
"JPG GIF Images", "jpg", "gif");
// 设置文件类型
chooser.setFileFilter(filter);
// 打开选择器面板
int returnVal = chooser.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
selectedFiles = chooser.getSelectedFiles();
repaint();
}
}
public void mouseClicked(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
Point point = MouseInfo.getPointerInfo().getLocation();
x = point.x;
y = point.y;
}
public void mouseReleased(MouseEvent e) {
Point point = MouseInfo.getPointerInfo().getLocation();
int thisX = point.x;
int thisY = point.y;
System.out.println("thisX=" + thisX + " " + "thisY=" + thisY);
if ((y - thisY 20 y - thisY 0)
|| (y - thisY 0 y - thisY -20)) {
// Y 在20范围内移动认为是水平移动
if (x thisX) {
// right
if (selectedFiles != null
fileIndex selectedFiles.length - 1) {
fileIndex++;
}
} else {
// left
if (selectedFiles != null fileIndex 0) {
fileIndex--;
}
}
} else {
if (x thisX) {
// 右下
width += 20;
height += 20;
} else {
// 左上
width -= 20;
height -= 20;
}
}
repaint();
}
class ImagePanel extends JPanel {
public void paint(Graphics g) {
super.paint(g);
if (selectedFiles != null) {
ImageIcon icon = new ImageIcon(selectedFiles[fileIndex]
.getPath());
g.drawImage(icon.getImage(), 0, 0, width, height, this);
}
}
}
}
