Java 图片处理 以及如何将字节数组byte[] 转化为Inputstream_JAVA_编程开发_程序员俱乐部

01?? ?import javax.imageio.*;//for ImageIO.read
02?? ?import java.awt.*;//for JFrame and JLabel etc
03?? ?import javax.swing.*;//for JFrame and JLabel etc
04?? ?import java.net.*;//for URL
05?? ?import java.io.*;//for catch (IOException e),File,InputStream, BufferedInputStream,and FileInputStream ect
06?? ?public class HelloJava{
07?? ??? public static void main (String[] args){
08?? ??? Image image = null;
09?? ???? try {
10?? ???????? // Read from a file
11?? ???????? File sourceimage = new File("source.gif");? //source.gif图片要与HelloJava.java同在一目录下
12?? ???????? image = ImageIO.read(sourceimage);
13?? ????? ?
14?? ???????? // Read from an input stream
15?? ???????? InputStream is = new BufferedInputStream(
16?? ??????????? new FileInputStream("mid.jpg"));? //mid.jpg图片要与HelloJava.java同在一目录下
17?? ???????? image = ImageIO.read(is);
18?? ????? ?
19?? ???????? // Read from a URL
20?? ???????? URL url = new URL("http://www.javaworld.com/images/012407-tipsbox.jpg");
21?? ???????? image = ImageIO.read(url);
22?? ???? } catch (IOException e) {
23?? ???? }
24?? ????? ?
25?? ???? // Use a label to display the image
26?? ???? JFrame frame = new JFrame();
27?? ???? JLabel label = new JLabel(new ImageIcon(image));
28?? ???? frame.getContentPane().add(label, BorderLayout.CENTER);
29?? ???? frame.pack();
30?? ???? frame.setVisible(true);
31?? ???? //关闭窗口--退出调试
32?? ????? frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
33?? ????? }
34?? ?}