Question

我使用下面的代码将BufferedIMage写入磁盘，但如果我不关闭程序，我无法用Windows打开它。我当时认为writer.dispose会做的伎俩但是我错了我想，我错过了什么？感谢您的帮助！

private void saveToFile( BufferedImage img, File file ) throws IOException 
{
    ImageWriter writer = null;
    java.util.Iterator iter = ImageIO.getImageWritersByFormatName("jpg");

    if( iter.hasNext() )
    {
        writer = (ImageWriter)iter.next();
    }

    ImageOutputStream ios = ImageIO.createImageOutputStream( file );
    writer.setOutput(ios);
    ImageWriteParam param = new JPEGImageWriteParam( java.util.Locale.getDefault() );
    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT) ;
    param.setCompressionQuality(0.98f);

    writer.write(null, new IIOImage( img, null, null ), param);
    writer.dispose();// here the dispose not working
}

Answer 1

我猜你也应该关闭ios。请尝试以下方法：

private void saveToFile( BufferedImage img, File file ) throws IOException 
{
    ImageWriter writer = null;
    java.util.Iterator iter = ImageIO.getImageWritersByFormatName("jpg");

    if( iter.hasNext() )
    {
        writer = (ImageWriter)iter.next();
    }

try {
       ImageOutputStream ios = ImageIO.createImageOutputStream( file );
       writer.setOutput(ios);
       ImageWriteParam param = new JPEGImageWriteParam( java.util.Locale.getDefault() );
       param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT) ;
       param.setCompressionQuality(0.98f);

       writer.write(null, new IIOImage( img, null, null ), param);
    }

    finally {
        if (ios != null) {
          try {
            ios.flush();
          }
     catch (      IOException e) {
          }
          try {
            ios.close();
          }
     catch (      IOException e) {
          }
        }
        if (writer != null) {
          writer.dispose();
        }
      } 
}

writer.dispose（）没有按预期工作

1 个答案: