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The project requirements: Should convert TIF into JPG with JAVA, But seems only IMAGEIO can't support TIF.
So should use JAI, Java Advantage Image jars.

JAI api download page: http://download.java.net/media/jai/builds/release/1_1_3/

J
AI API document page: http://download.oracle.com/docs/cd/E17802_01/products/products/java-media/jai/forDevelopers/jai-apidocs/index.html



C
ode as below:
package com.ebay.test1;
import java.awt.image.RenderedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import javax.media.jai.JAI;
import javax.media.jai.RenderedOp;
import org.junit.Test;
import com.sun.media.jai.codec.ImageCodec;
import com.sun.media.jai.codec.ImageDecoder;
import com.sun.media.jai.codec.ImageEncoder;
import com.sun.media.jai.codec.JPEGEncodeParam;
public class Snippet {
@Test
public void testTif2JPG2(){
try{
String filename =  "F:\\Downloads\\CCITT_2.TIF";
String jpegFileName = "F:\\Downloads\\CCITT_2.JPG";
RenderedOp source = JAI.create("fileload", filename);
FileOutputStream stream = null;
stream = new FileOutputStream(jpegFileName );
com.sun.media.jai.codec.JPEGEncodeParam JPEGparam = new
com.sun.media.jai.codec.JPEGEncodeParam();
ImageEncoder encoder =
ImageCodec.createImageEncoder("jpeg",stream,JPEGparam);
encoder.encode(source);
}catch(Exception e){
e.printStackTrace();
}
}
@Test
public void testTif2JPG3(){
try{
String filename =  "F:\\Downloads\\CCITT_2.TIF";
String jpegFileName = "F:\\Downloads\\CCITT_2.JPG";
FileOutputStream stream = null;
stream = new FileOutputStream(jpegFileName );
byte[] b = getBytesFromFile(new File(filename));
InputStream bais = new ByteArrayInputStream(b);
ImageDecoder decoder = ImageCodec.createImageDecoder("tiff", bais, null);
            RenderedImage ri = decoder.decodeAsRenderedImage();
// RenderedOp source = JAI.create("TIFF", bais);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
JPEGEncodeParam JPEGparam = new JPEGEncodeParam();
JPEGparam.setQuality(Float.MIN_VALUE);
ImageEncoder encoder = ImageCodec.createImageEncoder("jpeg",baos,JPEGparam);
encoder.encode(ri);
byte[] byteArray = baos.toByteArray();
FileOutputStream fos = new FileOutputStream(new File(jpegFileName));
fos.write(byteArray);
}catch(Exception e){
e.printStackTrace();
}
}
 @Test
public void testTif2JPG4(){
try{
String filename =  "F:\\Downloads\\CCITT_2.TIF";
String jpegFileName = "F:\\Downloads\\CCITT_2.JPG";
FileOutputStream stream = null;
stream = new FileOutputStream(jpegFileName );
byte[] b = getBytesFromFile(new File(filename));
InputStream bais = new ByteArrayInputStream(b);
            ImageDecoder decoder = ImageCodec.createImageDecoder("tiff", bais, null);
            RenderedImage ri = decoder.decodeAsRenderedImage();
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            ImageIO.write(ri, "JPEG", outputStream);
            stream.write(outputStream.toByteArray());
}catch(Exception e){
e.printStackTrace();
}
}
// Returns the contents of the file in a byte array.
    public static byte[] getBytesFromFile(File file) throws IOException {
        InputStream is = new FileInputStream(file);
    
        // Get the size of the file
        long length = file.length();
    
        // You cannot create an array using a long type.
        // It needs to be an int type.
        // Before converting to an int type, check
        // to ensure that file is not larger than Integer.MAX_VALUE.
        if (length > Integer.MAX_VALUE) {
        throw new IllegalArgumentException("File is too big, can't support.");
        }
    
        // Create the byte array to hold the data
        byte[] bytes = new byte[(int)length];
    
        // Read in the bytes
        int offset = 0;
        int numRead = 0;
        while (offset < bytes.length
               && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
            offset += numRead;
        }
    
        // Ensure all the bytes have been read in
        if (offset < bytes.length) {
            throw new IOException("Could not completely read file "+file.getName());
        }
    
        // Close the input stream and return bytes
        is.close();
        return bytes;
    }
}
posted on 2011-05-27 22:39 Daniel 阅读(2164) 评论(0)  编辑  收藏

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