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画像を読み書きするためのmapreduceコードを作成しようとしていますが、 ArrayIndexOutOfBoundsExceptionImageIO.writeを使用して画像を保存すると、画像に変更を加えていません。コードは次のとおりです。

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.io.InputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import java.io.BufferedInputStream;


import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.Writable;


public class mrimage implements Writable {
private static final Log log = LogFactory.getLog(mrimage.class);


BufferedImage reader = null;
String FileName;


public mrimage(){

}

public mrimage(BufferedImage buff,String fileName){
    this.reader = buff;
    this.FileName = fileName;
}

public BufferedImage getImage(int i){
return this.reader;
}

//reading generated image files
@Override
public void readFields(DataInput in) throws IOException { 
    try{
        reader = ImageIO.read(new BufferedInputStream((InputStream)in));

    }
    catch(Exception e){
        log.info(e);
    }
}

//writing the image files 
@Override
public void write(DataOutput out) throws IOException {

    try{
          ImageIO.write(reader, "jpg", (OutputStream)out);

    }
    catch(Exception e){
    }
}
}

誰か助けてもらえますか？

これは私が受け取っている完全なエラーメッセージです：

java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at java.io.ByteArrayInputStream.read(ByteArrayInputStream.java:174)
at java.io.DataInputStream.read(DataInputStream.java:132)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
at javax.imageio.stream.FileCacheImageInputStream.readUntil(FileCacheImageInputStream.java:121)
at javax.imageio.stream.FileCacheImageInputStream.read(FileCacheImageInputStream.java:167)
at javax.imageio.stream.ImageInputStreamImpl.readFully(ImageInputStreamImpl.java:337)
at javax.imageio.stream.ImageInputStreamImpl.readFully(ImageInputStreamImpl.java:347)
at com.sun.imageio.plugins.bmp.BMPImageReaderSpi.canDecodeInput(BMPImageReaderSpi.java:66)
at javax.imageio.ImageIO$CanDecodeInputFilter.filter(ImageIO.java:541)
at javax.imageio.spi.FilterIterator.advance(ServiceRegistry.java:793)
at javax.imageio.spi.FilterIterator.<init>(ServiceRegistry.java:787)
at javax.imageio.spi.ServiceRegistry.getServiceProviders(ServiceRegistry.java:491)
at javax.imageio.ImageIO.getImageReaders(ImageIO.java:620)
at javax.imageio.ImageIO.read(ImageIO.java:1412)
at javax.imageio.ImageIO.read(ImageIO.java:1326)
at imagetojpeg.KUImage.readFields(KUImage.java:33)
at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:67)
at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:40)
at org.apache.hadoop.mapreduce.ReduceContext.nextKeyValue(ReduceContext.java:116)
at org.apache.hadoop.mapreduce.ReduceContext.nextKey(ReduceContext.java:92)
at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:175)
at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:649)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:417)
at org.apache.hadoop.mapred.Child$4.run(Child.java:261)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
at org.apache.hadoop.mapred.Child.main(Child.java:255)
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1 に答える 1

-1

この問題に遭遇したところ、出力ファイルと入力ファイルの宣言方法が一致していないことが判明しました。前のステップで出力ファイルを type として定義しSequenceFileAsBinaryOutputFormatましたが、次のステップで入力を type として宣言しましたSequenceFileInputFormat。入力形式を変更するとSequenceFileAsBinaryInputFormat、問題はなくなりました。

于 2014-12-18T19:44:25.207 に答える