我想显示一些存储在oracle数据库中的BLOB中的tiff。我只是尝试使用im4java将它们从tiff转换为jpg或png,但这并不起作用。也许有可能在没有转换它们的情况下在Jasper中显示.tiff和其他img数据类型?!或者如果没有,是否有人有详细的解决方案如何转换它们? (我需要配置哪个图像类,如何在scriptlet中实现等)
谢谢大家!
IMOperation op = new IMOperation();
op.addImage();
op.addImage();
ConvertCmd convert = new ConvertCmd();
convert.run(op, new Object[]{inputImage.getAbsolutePath(), outputImage.getAbsolutePath()});
return outputImage;`
答案 0 :(得分:0)
解决了问题,这里的代码使用jai-imageIO.jar将tiff转换为jpg:
import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream;
import javax.imageio.ImageIO; import javax.imageio.spi.IIORegistry;
import net.sf.jasperreports.engine.JRAbstractScriptlet; import net.sf.jasperreports.engine.JRScriptletException;
public static InputStream convertTifToPng(InputStream inputImage)
throws IOException, InterruptedException {
IIORegistry registry = IIORegistry.getDefaultInstance();
registry.registerServiceProvider(new com.sun.media.imageioimpl.plugins.tiff.TIFFImageWriterSpi());
registry.registerServiceProvider(new com.sun.media.imageioimpl.plugins.tiff.TIFFImageReaderSpi());
BufferedImage image;
if (inputImage != null) {
image = ImageIO.read(inputImage);
} else {
return null;
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(image, "jpg", baos);
InputStream outputImage = new ByteArrayInputStream(baos.toByteArray());
return outputImage;
}