inputstream

问题 I am trying to encrypt an InputStream which I am getting from FileItem.getInputStream(); and I want to know the encrypted stream's length. If it would be a simple FileInputStream , I could have tried File#length() or FileInputStream#getChennal().size() though not sure even those would have given me exactly what I want, but, in this case what I have is an InputStream (the encrypted one) and I want to find length of the same, I tried searching on Internet but there I could not find any

问题 I am trying to encrypt an InputStream which I am getting from FileItem.getInputStream(); and I want to know the encrypted stream's length. If it would be a simple FileInputStream , I could have tried File#length() or FileInputStream#getChennal().size() though not sure even those would have given me exactly what I want, but, in this case what I have is an InputStream (the encrypted one) and I want to find length of the same, I tried searching on Internet but there I could not find any

问题 How can I get the number of lines(rows) from an InputStream or from a CsvMapper without looping through and counting them? Below I have an InputStream created from a CSV file. InputStream content = (... from a resource ...); CsvMapper mapper = new CsvMapper(); mapper.enable(CsvParser.Feature.WRAP_AS_ARRAY); MappingIterator<Object[]> it = mapper .reader(Object[].class) .readValues(content); Is it possible to do something like int totalRows = mapper.getTotalRows(); I would like to use this

问题 Problem I send the message "12345" from the socket server to the client: myPrintWriter.println("12345"); After that I read this message on client: int c; while ((c = inputStream.read( )) != -1) { byte[] buffer2 = new byte[1]; buffer2[0] = (byte) c; String symbol = new String(buffer2 , "UTF-8"); String symbolCode = Integer.toString((int)buffer2[0]); Log.v(symbol, symbolCode); } Log.v("c == -1", "Disconnected"); What I see in log: With out.println("abcrefg"); Why? I think it's line termination

问题 I have a javax.mail application that parses through emails and gets the InputStream for all application/* attachments: private DataInputStream getAttachmentStream(Message message) throws MessagingException, IOException { if (message.isMimeType("multipart/*")) { Multipart mp = (Multipart) message.getContent(); for (int p = 0; p < mp.getCount(); p++) { BodyPart part = mp.getBodyPart(p); if (part.getContentType().toLowerCase().startsWith("application")) { InputStream is = part.getInputStream();

问题 It would seem that the Client - Server application i wrote does work however it seems that not all data is processed every time. I am testing it on a local machine in Eclipse env. Server: private void sendData() throws Exception { DatagramPacket data = new DatagramPacket(outgoingData, outgoingData.length, clientAddress, clientPort); InputStream fis = new FileInputStream(responseData); int a; while((a = fis.read(outgoingData,0,512)) != -1) { serverSocket.send(data); } } Client: private void

问题 It would seem that the Client - Server application i wrote does work however it seems that not all data is processed every time. I am testing it on a local machine in Eclipse env. Server: private void sendData() throws Exception { DatagramPacket data = new DatagramPacket(outgoingData, outgoingData.length, clientAddress, clientPort); InputStream fis = new FileInputStream(responseData); int a; while((a = fis.read(outgoingData,0,512)) != -1) { serverSocket.send(data); } } Client: private void

问题 I have the following code. My idea is in OnCreate, I'll populate some categories from a text file in /res/raw to my database. First a tokenize the read file by lines (myCatToken), then each of these I split again to get the id and name. For some reason, instead of reading rat.txt I'm getting a totally different file and I have no idea why. The file that is actually read does exist in the /res/raw folder, however its named different. It seems that it has something to do with the resource it

问题 As the title says, I need to know how many bytes the file has that's "behind" an InputStream. I don't want to download all bytes and count (takes to long). I just need to know how many bytes the file has. Like this: int numberOfBytes = countBytes(inputStream); So, I need an implementation for countBytes(InputStream inputStream) 回答1: Other than by consuming the entire stream and counting the bytes, you can't (there's no API for it). There's the available() method, but it quite explicitly doesn

问题 I am solving this question. This is my code: import java.io.IOException; import java.util.Scanner; public class Main { public static void main(String[] args) throws IOException { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int k = sc.nextInt(); int[] t = new int[n]; int count = 0; for (int i = 0; i < n; i++) { t[i] = sc.nextInt(); if (t[i] % k == 0) { count++; } } System.out.println(count); } } But when I submit it, it get's timed out. Please help me optimize this to as much as