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ImageIO类的使用

news 来源：原创 2024/5/10 9:39:31

如何从文件或URL中读取图像?

1.从本地文本读取图片

File sourceimage = new File("c:\\mypic.jpg");
Image image = ImageIO.read(sourceimage);

2.从网络上获取图片

URL url = new URL("http://www.mkyong.com/image/mypic.jpg");
Image image = ImageIO.read(url);

如何写一个图像文件- Java ImagelO?

3. 使用ImageIO读取图片实例

package ImageIO;
import java.awt.Image;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;public class ReadImage{public static void main( String[] args ){Image image = null;try {URL url = new URL("https://tse3-mm.cn.bing.net/th/id/OIP-C.g9UbVfyVZX-SfD09JcYr5QHaEK?rs=1&pid=ImgDetMain");image = ImageIO.read(url);} catch (IOException e) {e.printStackTrace();}JFrame frame = new JFrame();frame.setSize(300, 300);JLabel label = new JLabel(new ImageIcon(image));frame.add(label);frame.setVisible(true);}
}

结果:

1.ImageIO可以从本地文件中读取图片和写入图片，也可以从网络上读取图片写入本地文件中。

2.演示ImageIO读取URL资源

package ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;public class WriteImage
{public static void main( String[] args ){BufferedImage image = null;try {URL url = new URL("https://tse3-mm.cn.bing.net/th/id/OIP-C.g9UbVfyVZX-SfD09JcYr5QHaEK?rs=1&pid=ImgDetMain");image = ImageIO.read(url);//.jpg文件占空间最小ImageIO.write(image, "jpg",new File("D:\\out.jpg"));ImageIO.write(image, "gif",new File("D:\\out.gif"));ImageIO.write(image, "png",new File("D:\\out.png"));} catch (IOException e) {e.printStackTrace();}System.out.println("成功写入D盘");}
}

如何在Java中加载和编写图像?

加载图片:

BufferedImage originalImage = ImageIO.read(new File("D:\\img\\0a3b3288-3446-4420-bbff-f263d0c02d8e.jpg"));

写入图片：

ImageIO.write(originalImage, "jpg", new File("D:\\image\\1.jpg"));

读写操作实例代码演示：

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;public class ImageTest {public static void main(String[] args) {try {//使用jpg格式，可以减少存储空间BufferedImage originalImage = ImageIO.read(new File("D:\\image\\1.jpg"));ImageIO.write(originalImage, "jpg", new File("D:\\image\\1.jpg"));} catch (IOException e) {System.out.println(e.getMessage());}}}