bytearrayoutputstream

问题 im sending videos to webservice and works ok with videos less than 10MB, if the video is about 12MB give me outofmemoryerror: This is my code: FileInputStream fileInputStream = new FileInputStream(fichero); int bytesAvailable = fileInputStream.available(); int maxBufferSize = 1024 * 1024 * 2; int bufferSize = Math.min(bytesAvailable, maxBufferSize); byte[] buffer = new byte[bufferSize]; int bytesRead = fileInputStream.read(buffer, 0, bufferSize); while (bytesRead > 0) { dos.write(buffer, 0,

问题 I am trying to upload a wav file to server using j2me httpconnection. However I am not able to do it. It throws null pointer exception when it's writing the bytes to the server. Sample is below. Exception is thrown at os.write(postBytes); line. Anyone with any idea? And the file I am uploading is test.pcm . public String send() throws Exception { form.append("Inside Send()"); bos = new ByteArrayOutputStream(); try { form.append("Making connections"); hc = (HttpConnection) Connector.open(url,

问题 Why ByteArrayOutputStream . close is declared with throws IOException ? First, de facto it can't throw anything, because its body is empty. Second, de jure it can't throw anything, because its documentation says "closing a ByteArrayOutputStream has no effect". Isn't this (non-important, but still) a little mistake? Yes, I understand that its superclass OutputStream implements Closable , the close method of which is allowed to throw IOException . But nobody forbids to override it (in

问题 I have a requirement to generate PDF file from JSON Objects and am able to produce PDF document using Apache FOP and Java. But i want to return the PDF file as ByteArrayOutputStream and then i have to encode like this Base64.getEncoder().encodeToString(baos.toByteArray()) . Please find the below code where am able to generate PDF file, instead of FileOutputStream i want to return as ByteArrayOutputStream . ByteArrayOutputStream outStream = new ByteArrayOutputStream(); Transformer

问题 I'm trying to capture the picture I'm getting from webview.capturePicture() to save it to an sqliteDatabase, to do I need to convert the image to a byte[] to be able to save it as a BLOB in my table, and then by able to retrieve that byte[] and convert it back to a bitmap. Here is what I'm doing: Picture p = webView.capturePicture(); ByteArrayOutputStream bos = new ByteArrayOutputStream(); p.writeToStream(bos); byte[] ba = bos.toByteArray()); I then retrieve the image by: byte[] image =

问题 Is there any advantage in wrapping a BufferedOutputStream around a ByteArrayOutputStream instead of just using the ByteArrrayOutputStream by itself? 回答1: Generally BufferedOutputStream wrapper is mostly used to avoid frequent disk or network writes. It can be much more expensive to separately write a lot of small pieces than make several rather large operations. The ByteArrayOutputStream operates in memory, so I think the wrapping is pointless. If you want to know the exact answer, try to

问题 I'm having quite a problem here, and I think it is because I don't understand very much how I should use the API provided by Java. I need to write an int and a byte[] into a byte[] I thought of using a DataOutputStream to solve the data writing with writeInt(int i) and write(byte[] b) , and to be able to put that into a byte array, I should use ByteArrayOutputStream method toByteArray(). I understand that this classes use the Wrapper pattern, so I had two options: DataOutputStream w = new

问题 I'm having quite a problem here, and I think it is because I don't understand very much how I should use the API provided by Java. I need to write an int and a byte[] into a byte[] I thought of using a DataOutputStream to solve the data writing with writeInt(int i) and write(byte[] b) , and to be able to put that into a byte array, I should use ByteArrayOutputStream method toByteArray(). I understand that this classes use the Wrapper pattern, so I had two options: DataOutputStream w = new

问题 This page: http://blog.ostermiller.org/convert-java-outputstream-inputstream describes how to create an InputStream from OutputStream: new ByteArrayInputStream(out.toByteArray()) Other alternatives are to use PipedStreams and new threads which is cumbersome. I do not like the idea of copying many megabytes to new in memory byte array. Is there a library that does this more efficiently? EDIT: By advice from Laurence Gonsalves, i tried PipedStreams and it turned out they are not that hard to

问题 This is a continuation of HTML tags are getting converted When I try to the following ByteArrayOutputStream stream= new ByteArrayOutputStream(); stream= stream.toString().replaceAll("<","<"); I am getting incompatible types; found: class java.lang.String, required: class java.io.ByteArrayOutputStream How can I replace < with < As mentioned in the other question, my HTML tags are getting converted and due to this reason before I print to open the HTML page, I would like to convert < to < if it