GeoTiffReader 阻止 deleteOnExit

Question

如果我向 GeoTiffReader 传递一个已标记为 deleteOnExit() 的文件实例，该文件将不会在退出时被删除。

File geotiffFile = Paths.get("geotools-test.tiff").toFile();
geotiffFile.deleteOnExit();
GeoTiffReader reader = new GeoTiffReader(geotiffFile);
reader.read(null);

为了隔离问题，我尝试了一个没有 GeoTiffReader 的版本，它按预期工作：

File geotiffFile = Paths.get("geotools-test.tiff").toFile();
geotiffFile.deleteOnExit();
Files.readAllBytes(geotiffFile.toPath());

我怀疑 GeoTiffReader 在退出时没有释放文件句柄。完整代码：

import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;

import org.geotools.gce.geotiff.GeoTiffReader;

public class GeoTiffReaderLingeringHandles
{
    public static void main(String[] args)
        throws IOException
    {
        main_working(args);
        // main_broken(args);
    }

    public static void main_working(String[] args)
        throws IOException
    {
        File geotiffFile = Paths.get("geotools-test.tiff").toFile();
        geotiffFile.deleteOnExit();
    }

    public static void main_broken(String[] args)
        throws IOException
    {
        File geotiffFile = Paths.get("geotools-test.tiff").toFile();
        geotiffFile.deleteOnExit();
        GeoTiffReader reader = new GeoTiffReader(geotiffFile);
        reader.read(null);
    }
}

Answer 1

您需要 dispose() GridCoverageReader，以便它有机会释放底层 inputStream，这将防止脑死亡操作系统稍后删除文件。

Answer 2

要解决您的问题，我相信您需要处理平面图像。以您的代码为例，

public static void main_broken(String[] args)
    throws IOException
{
    File geotiffFile = Paths.get("geotools-test.tiff").toFile();
    geotiffFile.deleteOnExit();
    GeoTiffReader reader = new GeoTiffReader(geotiffFile);
    GridCoverage2D result = reader.read(null);
    PlanarImage planarImage = (PlanarImage) result.getRenderedImage();
    ImageUtilities.disposePlanarImageChain(planarImage);
}

这应该会在退出时删除您的 GeoTiffFile。

GeoTiffReader 阻止 deleteOnExit

GeoTiffReader prevents deleteOnExit

java

geotools

geotiff