GAE Imageサービス

Google App Engineのイメージサービスを試しました、面白い機能なので、皆さんに紹介しようと思います。

まず、イメージサンプルのURLを紹介します。
【GAEイメージサービス】
htmlファイル：
イメージ表示
イメージサイズ変更表示
イメージ上下反転
イメージ左右反転
90度反転
クリップ
FeelingLucky
イメージ合成１
イメージ合成２

ImageserviceServlet.java

package imageservice;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import javax.servlet.http.*;
import com.google.appengine.api.images.Composite;
import com.google.appengine.api.images.Image;
import com.google.appengine.api.images.ImagesService;
import com.google.appengine.api.images.ImagesServiceFactory;
import com.google.appengine.api.images.Transform;
import com.google.appengine.repackaged.com.google.common.collect.Lists;

@SuppressWarnings("serial")
public class ImageserviceServlet extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException
{
File file = new File("ae_gwt_java.png");
if (file.exists())
{
resp.setContentType("image/png");
OutputStream out = resp.getOutputStream();
String cmd = req.getParameter("cmd");
FileInputStream fin = new FileInputStream(file);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
int len = 0;
byte[] buf = new byte[1024];
while ((len = fin.read(buf)) != -1) {
bout.write(buf, 0, len);
}
byte[] imagedata = bout.toByteArray();
//----------------------------------//
// 各処理
//----------------------------------//
if (cmd.equals("1"))
{
out.write(imagedata);
out.flush();
}
else if (cmd.equals("2"))
{
ImagesService imagesService = ImagesServiceFactory.getImagesService();
Image image = ImagesServiceFactory.makeImage(imagedata);
/* ***** イメージデータ編集・表示 ***** */
Transform trans = ImagesServiceFactory.makeResize(300, 300);
/* ***** イメージデータ編集・表示 ***** */
Image newImage = imagesService.applyTransform(trans, image);
byte[] newImageData = newImage.getImageData();
out.write(newImageData);
out.flush();
}
else if (cmd.equals("3"))
{
ImagesService imagesService = ImagesServiceFactory.getImagesService();
Image image = ImagesServiceFactory.makeImage(imagedata);
/* ***** イメージデータ編集・表示 ***** */
Transform trans = ImagesServiceFactory.makeVerticalFlip();
/* ***** イメージデータ編集・表示 ***** */
Image newImage = imagesService.applyTransform(trans, image);
byte[] newImageData = newImage.getImageData();
out.write(newImageData);
out.flush();
}
else if (cmd.equals("4"))
{
ImagesService imagesService = ImagesServiceFactory.getImagesService();
Image image = ImagesServiceFactory.makeImage(imagedata);
/* ***** イメージデータ編集・表示 ***** */
Transform trans = ImagesServiceFactory.makeHorizontalFlip();
/* ***** イメージデータ編集・表示 ***** */
Image newImage = imagesService.applyTransform(trans, image);
byte[] newImageData = newImage.getImageData();
out.write(newImageData);
out.flush();
}
else if (cmd.equals("5"))
{
ImagesService imagesService = ImagesServiceFactory.getImagesService();
Image image = ImagesServiceFactory.makeImage(imagedata);
/* ***** イメージデータ編集・表示 ***** */
Transform trans = ImagesServiceFactory.makeRotate(90);
/* ***** イメージデータ編集・表示 ***** */
Image newImage = imagesService.applyTransform(trans, image);
byte[] newImageData = newImage.getImageData();
out.write(newImageData);
out.flush();
}
else if (cmd.equals("6"))
{
ImagesService imagesService = ImagesServiceFactory.getImagesService();
Image image = ImagesServiceFactory.makeImage(imagedata);
/* ***** イメージデータ編集・表示 ***** */
Transform trans = ImagesServiceFactory.makeCrop(.25, .15, .8, .5);
/* ***** イメージデータ編集・表示 ***** */
Image newImage = imagesService.applyTransform(trans, image);
byte[] newImageData = newImage.getImageData();
out.write(newImageData);
out.flush();
}
else if (cmd.equals("7"))
{
ImagesService imagesService = ImagesServiceFactory.getImagesService();
Image image = ImagesServiceFactory.makeImage(imagedata);
/* ***** イメージデータ編集・表示 ***** */
Transform trans = ImagesServiceFactory.makeImFeelingLucky();
/* ***** イメージデータ編集・表示 ***** */
Image newImage = imagesService.applyTransform(trans, image);
byte[] newImageData = newImage.getImageData();
out.write(newImageData);
out.flush();
}
else if (cmd.equals("8"))
{
Image image = ImagesServiceFactory.makeImage(imagedata);
Image image1 = ImagesServiceFactory.makeImage(imagedata);
Composite comp1 = ImagesServiceFactory.makeComposite(
image1, 0,0,0.3f, Composite.Anchor.TOP_LEFT
);
Image image2 = ImagesServiceFactory.makeImage(imagedata);
Composite comp2 = ImagesServiceFactory.makeComposite(
image2, 0,0,0.5f, Composite.Anchor.TOP_RIGHT
);
Image image3 = ImagesServiceFactory.makeImage(imagedata);
Composite comp3 = ImagesServiceFactory.makeComposite(
image3, 0,0,0.7f, Composite.Anchor.BOTTOM_CENTER
);

List compositeList = Lists.newArrayList();
compositeList.add(comp1);
compositeList.add(comp2);
compositeList.add(comp3);
image = ImagesServiceFactory.getImagesService().composite(
compositeList,
360, 360, 0xfffL
);
byte[] newImageData = image.getImageData();
out.write(newImageData);
out.flush();
}
else if (cmd.equals("9"))
{
ImagesService imagesService = ImagesServiceFactory.getImagesService();
Image image1 = ImagesServiceFactory.makeImage(imagedata);
Transform trans1 = ImagesServiceFactory.makeVerticalFlip();
image1 = imagesService.applyTransform(trans1, image1);
Composite comp1 = ImagesServiceFactory.makeComposite(
image1, 0,0,0.3f, Composite.Anchor.TOP_LEFT
);
Image image2 = ImagesServiceFactory.makeImage(imagedata);
Transform trans2 = ImagesServiceFactory.makeHorizontalFlip();
image2 = imagesService.applyTransform(trans2, image2);
Composite comp2 = ImagesServiceFactory.makeComposite(
image2, 0,0,0.5f, Composite.Anchor.TOP_RIGHT
);
Image image3 = ImagesServiceFactory.makeImage(imagedata);
Transform trans3 = ImagesServiceFactory.makeRotate(270);
image3 = imagesService.applyTransform(trans3, image3);
Composite comp3 = ImagesServiceFactory.makeComposite(
image3, 0,0,0.7f, Composite.Anchor.BOTTOM_CENTER
);

List compositeList = Lists.newArrayList();
compositeList.add(comp1);
compositeList.add(comp2);
compositeList.add(comp3);
Image image = ImagesServiceFactory.makeImage(imagedata);
image = ImagesServiceFactory.getImagesService().composite(
compositeList,
image.getWidth()*2,
image.getHeight()*2,
0xffffffL
);
byte[] newImageData = image.getImageData();
out.write(newImageData);
out.flush();
}
}
else
{
resp.setContentType("text/plain");
resp.getWriter().println("イメージファイルは存在しません。");
}