bufferedreader

问题 I have a text file with one integer per row - 10 20 50 I want to read and print these numbers twice or maybe even multiple times. I tried some code and it failed. How do I change my code to print the list twice ? import java.io.BufferedReader; import java.io.DataInputStream; import java.io.FileInputStream; import java.io.InputStreamReader; public class DoubleBuffer { public static void main(String[] args) { try { FileInputStream fstream = new FileInputStream("c:/files/numbers.txt");

问题 EDIT1: I did change the code such that the update was done within the while loop. HOWEVER, NO CHANGE. SHOWN THIS IN CODE BELOW. ALSO, removed other irrelevant lines on onProgressUpdate(). SHOWN IN CODE BELOW. Please answer like you would teach an amateur. I am passing data from doInBackground() to the main UI currently. It works. However, it is very slow. I want to display "instant" results and not after the loop completes. That's how the code is written, however, performance wise, if the

问题 Hi I am trying to execute external program from Java program and read the stdout message in real time , without waiting for the program to exit. However, i found that there are different stdout behaviour in different .exe program, and I don't know how to handle it. Example 1: server1.exe is a console program. When i run it, it will continuously listening on a port. When a client is connected to it, it will generate 1 line of stdout output every 1 second. It will not exit unless i press "ctrl

问题 I am loading a CSV file and kept alive without closing BufferReader. Now I want to add/delete few more rows to my CSV and get updated CSV. Which means I want dynamically notified when CSV file is altered. Here is my sample code: public class Check { public static void main(String args[]) throws IOException, InterruptedException{ Check ch = new Check(); //args[0] = "C:\\Users\\raponnam\\Desktop\\GxDefault.csv"; String csvFile="C:\\Users\\raponnam\\Desktop\\GxDefault.csv"; int lineCounter=0; if

问题 Suppose I write a function to parse data from a txt file with with-open and clojure.java.io/reader, and then I wrote another function to call the reader function multiple of times in order to process data, e.g. (defn grabDataFromFile [file patternString] (let [data (atom [])] (with-open [rdr (clojure.java.io/reader file)] (doseq [line (line-seq rdr)] (if (re-matches (re-pattern patternString) line) (swap! data conj line)))) @data)) (defn myCalculation [file ] (let [data1 (grabDataFromFile

问题 the Java Docs says Java Docs public class BufferedReader extends Reader Reads text from a character-input stream, buffering characters so as to provide for the >efficient reading of characters, arrays, and lines. The buffer size may be specified, or the default size may be used. The default is large >enough for most purposes. In general, each read request made of a Reader causes a corresponding read request to be >made of the underlying character or byte stream. It is therefore advisable to

问题 i'm trying to read a web address from a text and then have the app open that address, my buffered reader seems to be reading the lines correctly but readline keeps coming back null String rsslink = null; InputStream is = getResources().openRawResource(R.raw.xmlsource); BufferedReader br = new BufferedReader(new InputStreamReader(is)); try { while ((rsslink = br.readLine()) != null) { } } catch (IOException e) { e.printStackTrace(); } String RSS_LINK = rsslink; Log.d(Constants.TAG, "Service

问题 I'm writing a program in Java that sends commands to a C program and reads its output, but I see that it hangs when I try to actually read the output. The code is: import java.io.*; public class EsecutoreC { private String prg; OutputStream stdin=null; InputStream stderr=null; InputStream stdout=null; BufferedReader br; Process pr; public EsecutoreC(String p){ prg=p; try { pr=Runtime.getRuntime().exec(prg); stdin=pr.getOutputStream(); stderr=pr.getErrorStream(); stdout=pr.getInputStream(); br

问题 I have a process (actually a webserver) that writes to a log file as the POST coming in from clients. Then I have a separate process that reads the log file like (tail -f) in a loop: BufferedReader reader = new BufferedReader(new FileReader(logFilePath)); String line = null; while (true) { if ( (line = reader.readLine()) != null ) { if (firstLine == null) firstLine = line; processLine(line); continue; } try { Thread.sleep(sleepTime); long ts = System.currentTimeMillis(); } catch

问题 I have the following code but I don't understand how I can reset the pointer to the starter position: BufferedReader inp=new BufferedReader(new FileReader(file)); Scanner leggi=new Scanner(inp); for(int i=0;i<nwords;i++){ while(leggi.hasNext()) if(leggi.next().equals(args[i+2])) occorrenze[i]=occorrenze[i]+1; } inp.close(); I tried inp.mark(0); inp.reset(); with no results. 回答1: Paul, I suggest you read through this old thread: Java BufferedReader back to the top of a text file?. Personally I