java 读取图片_用java读取图片的三种方式

说明：把图片显示在label上；常用api的作用；使用JFrame等时   关闭窗口--退出调试的代码。

完整代码，已编译执行成功

import javax.imageio.*;//for ImageIO.read

import java.awt.*;//for JFrame and JLabel etc

import javax.swing.*;//for JFrame and JLabel etc

import java.net.*;//for URL

import java.io.*;//for catch (IOException e),File,InputStream, BufferedInputStream,and FileInputStream ect

public class HelloJava{

public static void main (String[] args){

Image image = null;

try {

// Read from a file

File sourceimage = new File("source.gif");  //source.gif图片要与HelloJava.java同在一目录下

image = ImageIO.read(sourceimage);

// Read from an input stream

InputStream is = new BufferedInputStream(

new FileInputStream("mid.jpg"));  //mid.jpg图片要与HelloJava.java同在一目录下

image = ImageIO.read(is);

// Read from a URL

URL url = new URL("http://www.javaworld.com/images/012407-tipsbox.jpg");

image = ImageIO.read(url);

} catch (IOException e) {

}

// Use a label to display the image

JFrame frame = new JFrame();

JLabel label = new JLabel(new ImageIcon(image));

frame.getContentPane().add(label, BorderLayout.CENTER);

frame.pack();

frame.setVisible(true);

//关闭窗口--退出调试

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}