bytearrayinputstream

ByteArrayInputStream to FileInputStream without writing the file to hard drive

由 ╄→гoц情女王★ 提交于 2021-01-29 10:40:09
问题 I read a file from the database that is in a byte[] array, using the ByteArrayInputStream . InputStream input = new ByteArrayInputStream(lc.getTable()); For a further processing of the file I need a FileInputStream . But I don't want to save the file on the hard disk first to read it again. Can this be done or does the file have to be written out first? 回答1: Not really. Then the further processing is overspecified; it should only require an InputStream. One could create a temporary deleted-on

Does IOUtils.toByteArray(inputStream) method internally close inputStream object?

由 这一生的挚爱 提交于 2020-07-22 10:27:47
问题 Here is my code flow for which file content is getting lost and I think may be IOUtils.toByteArray() line is problem, please guide what is actually going wrong here. File content getting lost : InputStream stream = someClient.downloadApi(fileId); byte[] bytes = IOUtils.toByteArray(stream); String mimeType = CommonUtils.fileTypeFromByteArray(bytes); String fileExtension=FormatToExtensionMapping.getByFormat(mimeType).getExtension(); String filePath = configuration.getDownloadFolder() + "/" ;

Byte array to buffered image conversion slow

由 淺唱寂寞╮ 提交于 2019-12-18 05:55:41
问题 I have a simple server-side code that receives a byte array representing an image in JPEG format and returns the dimensions of the image. public String processImage(byte[] data) { long startTime = System.currentTimeMillis(); ByteArrayInputStream stream = new ByteArrayInputStream(data); BufferedImage bufferedImage; bufferedImage = ImageIO.read(stream); int height = bufferedImage.getHeight(); int width = bufferedImage.getWidth(); long endTime = System.currentTimeMillis(); return "height="

What's the difference between InputStream and ByteArrayInputStream?

由 一个人想着一个人 提交于 2019-12-18 04:54:14
问题 The following code is extracted from the java web start chapter of the core java volume 1. ByteArrayOutputStream out = new ByteArrayOutputStream(); PrintStream printOut = new PrintStream(out); printOut.print(panel.getText()); //panel.getText() return a String InputStream data = new ByteArrayInputStream(out.toByteArray()); FileSaveService service = (FileSaveService) ServiceManager .lookup("javax.jnlp.FileSaveService"); service.saveFileDialog(".", new String[] { "txt" }, data, "calc.txt");

Not Printing created iText pdf file by ByteArrayOutputStream

由 爱⌒轻易说出口 提交于 2019-12-11 03:03:36
问题 I coded for creating iText PDF file in the memory by ByteArrayOutputStream by click of a button and print that PDF file when click of that same button same time..Code is error free.. Below is my code for the specific button; int print = JOptionPane.showConfirmDialog(null, "Do you really want to Print the Invoice ?","Print Confirmation",JOptionPane.YES_NO_OPTION); if((print)==0){ try{ String saledate = ((JTextField)dayChooser.getDateEditor().getUiComponent()).getText(); String invoice =

ByteArrayOutputStream/InputStream losing newline characters on S3 Import

由 感情迁移 提交于 2019-12-10 12:18:06
问题 I have the following code (pseudo code-ish)... ByteArrayOutputStream output = new ByteArrayOutputStream(); output.write("something\n".getBytes()); output.write("something\n".getBytes()); ByteArrayOutputStream input = new ByteArrayInputStream(output.getBytes()); s3.putStream(input); Then when I get the file from s3 it looks like this: somethingsomething. The newlines are gone!! I can't figure out why that is happening and internet searches have not been helpful. Does anyone have any ideas? 回答1

Persisting B-Tree nodes to RandomAccessFile

由 大兔子大兔子 提交于 2019-12-08 06:58:33
问题 My project is trying to write a B-Tree. I am having trouble persisting nodes of the tree to a random access file. I am constantly encountering EOFexceptions and StreamCorruptionExceptions . some resources that I am currently using are: Converting any object to a byte array in java https://inaved-momin.blogspot.com/2012/08/understanding-javaiostreamcorruptedexce.html current Problem: reading a link position from a node and then trying to read it from the random access file is causing a

Convert Contents Of A ByteArrayInputStream To String

由 做~自己de王妃 提交于 2019-12-04 15:36:55
问题 I read this post but I am not following. I have seen this but have not seen a proper example of converting a ByteArrayInputStream to String using a ByteArrayOutputStream . To retrieve the contents of a ByteArrayInputStream as a String , is using a ByteArrayOutputstream recommended or is there a more preferable way? I was considering this example and extend ByteArrayInputStream and utilize a Decorator to increase functionality at run time. Any interest in this being a better solution to

Convert Contents Of A ByteArrayInputStream To String

由 强颜欢笑 提交于 2019-12-03 09:41:53
I read this post but I am not following. I have seen this but have not seen a proper example of converting a ByteArrayInputStream to String using a ByteArrayOutputStream . To retrieve the contents of a ByteArrayInputStream as a String , is using a ByteArrayOutputstream recommended or is there a more preferable way? I was considering this example and extend ByteArrayInputStream and utilize a Decorator to increase functionality at run time. Any interest in this being a better solution to employing a ByteArrayOutputStream ? A ByteArrayOutputStream can read from any InputStream and at the end

Hybris MediaModel how to get Bytes

由 蓝咒 提交于 2019-12-02 13:49:52
问题 Is there any way in Hybris to obtain all the bytes from a MediaModel ? When I want to instantiate a PdfReader , I need to pass either the Path of the File OR the ByteArrayInputStream. How can I transform the MediaModel into a Byte Array? 回答1: You can use MediaService @Resource private MediaService mediaService; //... final MediaModel mediaModel= mediaService.getMedia("mediaName"); final InputStream inputStream = mediaService.getStreamFromMedia(mediaModel); Then you can pass InputStream or
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