imagedb.java

Tapestry的一个练习例子

package com.ttdev.updown;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class ImageDB {
	public static byte[] loadImage(int imageId) {
		InputStream input = ImageDB.class.getResourceAsStream("/test.jpg");
		ByteArrayOutputStream output = new ByteArrayOutputStream();
		byte buf[] = new byte[1024];
		for (;;) {
			try {
				int noBytesRead = input.read(buf);
				if (noBytesRead == -1) {
					return output.toByteArray();
				}
				output.write(buf, 0, noBytesRead);
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}
	}

	public static void saveImage(int imageId, byte[] imageData,
			String imageFolder) {
		File imageFile = new File(imageFolder, imageId + ".jpg");
		try {
			FileOutputStream output = new FileOutputStream(imageFile);
			try {
				output.write(imageData);
			} finally {
				output.close();
			}
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}
}