inputstream

Change InputStream by applying regex on it

由 北慕城南 提交于 2020-03-06 05:15:35
问题 I have an InputStream downloaded from the internet. And I need to apply regex on it - so that all occurrences of that regex would be changed to string, wich is provided. I need an InputStream as a return value since it should be forwarded to api. Basically, such signature would be the best: InputStream applyRegex(InputStream stream, Pattern pattern, String changeString){ ... } I have very basic knowledge of working with streams, please give an answer in method form, if it is possible. By the

Change InputStream by applying regex on it

由 ∥☆過路亽．° 提交于 2020-03-06 05:14:51
问题 I have an InputStream downloaded from the internet. And I need to apply regex on it - so that all occurrences of that regex would be changed to string, wich is provided. I need an InputStream as a return value since it should be forwarded to api. Basically, such signature would be the best: InputStream applyRegex(InputStream stream, Pattern pattern, String changeString){ ... } I have very basic knowledge of working with streams, please give an answer in method form, if it is possible. By the

使用InputStream的markSupported、mark和reset

由 两盒软妹~` 提交于 2020-02-28 14:28:19
使用InputStream的markSupported、mark和reset mark用于标记地方，以后再调用reset时就可以再回到这个mark过的地方。 mark方法有个整型参数，意思是，在读出这么多个字符之前，保持mark有效。 比如说mark(10)，那么在read()10个以内的字符时，reset（）操作后可以重新读取已经读出的数据， 如果已经读取的数据超过10个，那reset()操作后，就不能正确读取以前的数据了，因为此时mark标记已经失效。 Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes. The readlimit arguments tells this input stream to allow that many bytes to be read before the mark position gets invalidated. The general contract of mark is that, if the method

Why do popular Java Base64 encoding libraries use OutputStreams for Encoding and InputStreams for encoding?

由 ￣綄美尐妖づ 提交于 2020-02-24 16:07:13
问题 I have been trying to solve a memory issue in a Java program where we are loading an entire file into memory, base64 encoding it and then using it as a form parameter in a post request. This is cause OOME due to the extremely large file size. I am working on a solution where I am able to stream the file through a base64 encoder, into the request body of an Http Post request. One of the common patterns I have noticed in all of the popular encoding libraries( Guava, java.util.Base64, android

Can BufferedInputStream.read(byte[] b, int off, int len) ever return 0? Are there significant, broken InputStreams that might cause this?

由 ￣綄美尐妖づ 提交于 2020-02-24 04:24:12
问题 Is it ever possible for BufferedInputStream(byte[] b, int off, int len) to return 0? READER'S DIGEST VERSION (you can read the rest below, for context, but I think it boils down to this:) Are there InputStreams (i.e. SocketInputStream, CipherInputStream, etc. in the JDK or in commonly used libraries (i.e. Apache Commons, Guava), that don't correctly honor the contract of InputStream.read(byte[],off,len) and might return '0' even if len != 0? (Note 1: my interest is whether it can really

How to read large excel file in android app?

由 我与影子孤独终老i 提交于 2020-02-06 08:16:06
问题 My app saves the data from the uploaded excel file in Room, after that search in a selected column (by the user ) for keyword then show all row for the cell which has this keyword. it reads small Excel files successfully but it stuck if I uploaded file more than 2 Mb at this line Workbook myWorkBook = WorkbookFactory.create(inputStream); and this error details .. java.lang.OutOfMemoryError Failed to allocate a 40 byte allocation with 32 free bytes and 32B until OOM, max allowed footprint

Handling multipart attachments in CXF APIs

由 混江龙づ霸主 提交于 2020-01-24 07:26:46
问题 I am trying to develop an API call using Apache CXF that takes in an attachment along with the request. I followed this tutorial and this is what I have got so far. @POST @Path("/upload") @RequireAuthentication(false) public Response uploadWadl(MultipartBody multipartBody){ List<Attachment> attachments = multipartBody.getAllAttachments(); DataHandler dataHandler = attachments.get(0).getDataHandler(); try { InputStream is = dataHandler.getInputStream(); } catch (IOException e) { e

Android Bluetooth: java.io.IOException: Service discovery failed

由 随声附和 提交于 2020-01-22 15:25:12
问题 I'm trying to develop an Android application which transfers images from one device to another. The received image would then be shown on the ImageView inside my application. To achieve my task, I thought to send a byte array of the bitmap. I'm able to get the first image on the imageview. But, as soon as I click on the button to send another image the application fails to send the bitmap. It shows me an exception "java.io.IOException: Service fiscovery failed." To send any image successfully

Java-How to extend InputStream to read from a JTextField?

由 心不动则不痛 提交于 2020-01-21 12:13:06
问题 Working on a project I got into running java applications through a small console-like window. Thanks to the wonderful community in here I managed to solve the problem with outputting the data from a proccess but my command-line applications running will constantly give errors as there is no input stream. Based on the last helpful reply in that thread I suppose I shall approach similarly the JTextFieldInputStream extends InputStream implementation, but looking in the javadocs and throughout

Discarding input from socket

由 一个人想着一个人 提交于 2020-01-21 07:35:14
问题 From Socket documentation: shutdownInput public void shutdownInput() throws IOException Places the input stream for this socket at "end of stream". Any data sent to the input stream side of the socket is acknowledged and then silently discarded. If you read from a socket input stream after invoking shutdownInput() on the socket, the stream will return EOF. In order to test interaction between clients in a server, I've written some client bots . These bots generate somewhat random client
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