Pessol to precisando redimencionar uma imagem utilizando o java tipo faço o upload da imagem ate ai tudo bem mas queria salvar uma minatura no banco pra mostrar a miniatura e se o usuario quiser baixar a figura do tamanho normal. Então alquem algum exemplo de redimensionamento de imagem com Java ou um lik q possa ajudar???
Esqueleto.
Da uma olhada nesse artigo que saiu no Java Technology Fundamentals Newsletter
http://blogs.sun.com/JavaFundamentals/entry/getting_to_know_abook
kra primeiro obrigado pela ajuda, mas não sei se expliquei direito quero reduzir a imagem antes de enviar pro banco so que o kra nesse exemplo não faz isso. Pelo q entendi ele so salva no banco. Na verdade quero salvar uma imagem em tamanho natural, q podera ser feita o download e uma miniatura pra gerar pre-vizualização sem matar o server. Mesmo assim muito obrigado.
Esqueleto
kra primeiro obrigado pela ajuda, mas não sei se expliquei direito quero reduzir a imagem antes de enviar pro banco so que o kra nesse exemplo não faz isso. Pelo q entendi ele so salva no banco. Na verdade quero salvar uma imagem em tamanho natural, q podera ser feita o download e uma miniatura pra gerar pre-vizualização sem matar o server. Mesmo assim muito obrigado.
Esqueleto
Hehehe demorou mas consequi para quem tem o mesmo problema seque uma classe q redimensiona a imagem e salva em disco.
Esqueleto
[code]/*
Copyright © 2003, Rafael Steil
All rights reserved.
Redistribution and use in source and binary forms,
with or without modification, are permitted provided
that the following conditions are met:
copyright notice, this list of conditions and the
following disclaimer.
above copyright notice, this list of conditions and
the following disclaimer in the documentation and/or
other materials provided with the distribution.
the names of its contributors may be used to endorse
or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
HOLDERS AND CONTRIBUTORS “AS IS” AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
This file creation date: 21/04/2004 - 19:54:16
net.jforum.util.image.ImageUtils.java
The JForum Project
$Id: ImageUtils.java,v 1.11 2004/05/04 00:59:44 rafaelsteil Exp $
*/
package br.inf.bluestar;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.PixelGrabber;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.Locale;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
import javax.imageio.stream.ImageOutputStream;
/**
Utilities methods for image manipulation.
It does not support writting of GIF images, but it
can read from. GIF images will be saved as PNG.
@author Rafael Steil
*/
public class ImageUtils
{
public static final int IMAGE_JPEG = 0;
public static final int IMAGE_PNG = 1;
/**
BufferedImage
/**
Resizes an image.
@param image The image to resize
@param maxWidth The image’s max width
@param maxHeight The image’s max height
@return A resized BufferedImage
*/
public static BufferedImage resizeImage(Image image, int type, int maxWidth, int maxHeight)
{
float zoom = 1.0F;
Dimension largestDimension = new Dimension(maxWidth, maxHeight);
// Original size
int imageWidth = image.getWidth(null);
int imageHeight = image.getHeight(null);
float aspectRation = (float)imageWidth / imageHeight;
if (imageWidth > maxWidth || imageHeight > maxHeight) {
int scaledW = Math.round(imageWidth * zoom);
int scaledH = Math.round(imageHeight * zoom);
Dimension preferedSize = new Dimension(scaledW, scaledH);
if ((float)largestDimension.width / largestDimension.height > aspectRation) {
largestDimension.width = (int)Math.ceil(largestDimension.height * aspectRation);
}
else {
largestDimension.height = (int)Math.ceil((float)largestDimension.width / aspectRation);
}
imageWidth = largestDimension.width;
imageHeight = largestDimension.height;
}
return createBufferedImage(image, type, imageWidth, imageHeight);
}
/**
ImageUtils.IMAGE_JPEG to save as JPEGImageUtils.IMAGE_PNG to save as PNG.false if no appropriate writer is found/**
Compress and save an image to the disk.
Currently this method only supports JPEG images.
@param image The image to save
@param toFileName The filename to use
@param type The image type. Use ImageUtils.IMAGE_JPEG to save as JPEG
images, or ImageUtils.IMAGE_PNG to save as PNG.
@param compress Set to true if you want to compress the image.
@return false if no appropriate writer is found
@throws IOException
*/
public static void saveCompressedImage(BufferedImage image, String toFileName, int type) throws IOException
{
if (type == IMAGE_PNG) {
throw new UnsupportedOperationException(“PNG compression not implemented”);
}
ImageWriter writer = null;
Iterator iter = ImageIO.getImageWritersByFormatName(“jpg”);
writer = (ImageWriter)iter.next();
ImageOutputStream ios = ImageIO.createImageOutputStream(new File(toFileName));
writer.setOutput(ios);
ImageWriteParam iwparam = new JPEGImageWriteParam(Locale.getDefault());
iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwparam.setCompressionQuality(0.7F);
writer.write(null, new IIOImage(image, null, null), iwparam);
ios.flush();
writer.dispose();
ios.close();
}
/**
Creates a BufferedImage from an Image.
@param image The image to convert
@param w The desired image width
@param h The desired image height
@return The converted image
*/
public static BufferedImage createBufferedImage(Image image, int type, int w, int h)
{
if (type == ImageUtils.IMAGE_PNG && hasAlpha(image)) {
type = BufferedImage.TYPE_INT_ARGB;
}
else {
type = BufferedImage.TYPE_INT_RGB;
}
BufferedImage bi = new BufferedImage(w, h, type);
Graphics g = bi.createGraphics();
g.drawImage(image, 0, 0, w, h, null);
g.dispose();
return bi;
}
/**
Determines if the image has transparent pixels.
@param image The image to check for transparent pixel.s
@return true of false, according to the result
@throws InterruptedException
*/
public static boolean hasAlpha(Image image)
{
try {
PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
pg.grabPixels();
return pg.getColorModel().hasAlpha();
}
catch (InterruptedException e) {
return false;
}
}
}[/code]
e para testa-la seque a classe de teste.
package br.inf.bluestar;
import java.awt.Image;
import java.io.IOException;
import javax.swing.ImageIcon;
public class ResizeImage {
public static void main (String args[]){
Image img = null;
try {
img = new ImageIcon("C://virusderede.jpg").getImage();
} catch (RuntimeException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
ImageUtils.saveImage(ImageUtils.resizeImage(img,ImageUtils.IMAGE_JPEG , 100, 300), "C://4.jpg", ImageUtils.IMAGE_JPEG);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}Fala amigo,
Acredito no SQL Server 2005 tenha um dataType [Imagem]. Acho que vale a pena conferir.
Abs,
Parabéns, este é o primeiro exemplo que dá pra aumentar a imagem também. Os que vi no site do JAI só dava pra diminuir.
Bom, mas toda vez que compilo apresenta estas excessões:
init:
deps-module-jar:
deps-ear-jar:
deps-jar:
Compiling 1 source file to C:\Documents and Settings\FF Criações\Meus documentos\NetBeansProjects\JAI\build\web\WEB-INF\classes
C:\Documents and Settings\FF Criações\Meus documentos\NetBeansProjects\JAI\src\java\portalJava\Miniatura.java:8: warning: com.sun.image.codec.jpeg.ImageFormatException is Sun proprietary API and may be removed in a future release
import com.sun.image.codec.jpeg.ImageFormatException;
C:\Documents and Settings\FF Criações\Meus documentos\NetBeansProjects\JAI\src\java\portalJava\Miniatura.java:9: warning: com.sun.image.codec.jpeg.JPEGCodec is Sun proprietary API and may be removed in a future release
import com.sun.image.codec.jpeg.JPEGCodec;
C:\Documents and Settings\FF Criações\Meus documentos\NetBeansProjects\JAI\src\java\portalJava\Miniatura.java:10: warning: com.sun.image.codec.jpeg.JPEGEncodeParam is Sun proprietary API and may be removed in a future release
import com.sun.image.codec.jpeg.JPEGEncodeParam;
C:\Documents and Settings\FF Criações\Meus documentos\NetBeansProjects\JAI\src\java\portalJava\Miniatura.java:11: warning: com.sun.image.codec.jpeg.JPEGImageEncoder is Sun proprietary API and may be removed in a future release
import com.sun.image.codec.jpeg.JPEGImageEncoder;
C:\Documents and Settings\FF Criações\Meus documentos\NetBeansProjects\JAI\src\java\portalJava\Miniatura.java:130: warning: com.sun.image.codec.jpeg.JPEGImageEncoder is Sun proprietary API and may be removed in a future release
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out2);
C:\Documents and Settings\FF Criações\Meus documentos\NetBeansProjects\JAI\src\java\portalJava\Miniatura.java:130: warning: com.sun.image.codec.jpeg.JPEGCodec is Sun proprietary API and may be removed in a future release
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out2);
C:\Documents and Settings\FF Criações\Meus documentos\NetBeansProjects\JAI\src\java\portalJava\Miniatura.java:131: warning: com.sun.image.codec.jpeg.JPEGEncodeParam is Sun proprietary API and may be removed in a future release
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
C:\Documents and Settings\FF Criações\Meus documentos\NetBeansProjects\JAI\src\java\portalJava\Miniatura.java:140: warning: com.sun.image.codec.jpeg.ImageFormatException is Sun proprietary API and may be removed in a future release
} catch (ImageFormatException e) {
^
Note: C:\Documents and Settings\FF Criações\Meus documentos\NetBeansProjects\JAI\src\java\portalJava\Miniatura.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
8 warnings
compile-single:
CONSTRUÍDO COM SUCESSO (tempo total: 1 segundo)
Aguardo respostas.
att