Java 图片处理 以及如何将字节数组byte[] 转化为Inputstream

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    }