效果图:
1.点击打开按钮,选择要打开的图片:
2.打开后的图片:
3.再单击另存为到指定位置再点击保存:
4.保存后,双击打开可以查看:
代码实现:
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
//读取并保存图像
public class ReadAndSaveImage {
Frame frame = new Frame("图片查看器");
MenuBar menuBar = new MenuBar();//菜单条
Menu menu = new Menu("文件");
MenuItem open = new MenuItem("打开");
MenuItem save = new MenuItem("另存为");
//记录本地存取到内存中的图片
BufferedImage image;
private class MyCanvas extends Canvas {
@Override
public void paint(Graphics g) {
g.drawImage(image,0,0,null);//绘制图片
}
}
MyCanvas drawArea = new MyCanvas();
public void init() {
menuBar.add(menu);
menu.add(open);
menu.add(save);
frame.setMenuBar(menuBar);
open.addActionListener(e->{
//打开一个文件对话框
FileDialog fileDialog = new FileDialog(frame,"打开图片",FileDialog.LOAD);//打开
fileDialog.setVisible(true);
String dir = fileDialog.getDirectory();//获取图片路径
String fileName = fileDialog.getFile();//获取图片名称
try {
image = ImageIO.read(new File(dir,fileName));//获取图片
drawArea.repaint();//重绘图片
} catch (IOException ex) {
ex.printStackTrace();
}
});
save.addActionListener(e->{
//展示文件对话框
FileDialog fileDialog = new FileDialog(frame,"保存图片",FileDialog.SAVE);//保存
fileDialog.setVisible(true);
String dir = fileDialog.getDirectory();//获取图片路径
String fileName = fileDialog.getFile();//获取图片名称
try {
ImageIO.write(image,"JPEG",new File(dir,fileName));//将图片存取到指定位置
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
});
frame.add(drawArea);
frame.setBounds(700,250,800,800);
frame.setVisible(true);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.out.println("程序停止运行!");
System.exit(0);
}
});
}
public static void main(String[] args) {
new ReadAndSaveImage().init();
}
}