BufferedReader read « API « Java I/O Q&A

1. Reading from large, continuously growing file with BufferedReader    stackoverflow.com

The task I have is to (somewhat efficiently) read line-by-line through a very large, continuously growing file. Here's basically what I'm doing now:

BufferedReader rd = //initialize BufferedReader
String line;

2. How do I read a file again using buffered reader in Java?    stackoverflow.com

I have a Java code that reads through an input file using a buffer reader until the readLine() method returns null. I need to use the contents of the file again ...

3. Reading part of file with BufferedReader    stackoverflow.com

I'm trying to write a function that grabs a certain part of a file, sends that to another function, then continue to do the same thing from where the BufferedReader left ...

4. Java: how to read BufferedReader faster    stackoverflow.com

I want to optimize this code:

InputStream is = rp.getEntity().getContent();      

BufferedReader reader = new BufferedReader(new InputStreamReader(is));

String text = "";
String aux = "";

while ((aux = reader.readLine()) != null) ...

5. Java reading from file problem    stackoverflow.com

I have a file, let's call it text.txt. It contains a few lines of text. I am trying to read this in with my code so that I can edit it ...

6. Read Input until control+d    stackoverflow.com

I want to prompt the user to begin entering characters and I want them to be able to enter characters as long as they want until they hit control+d to exit. For ...

7. Get web page content to String is very slow    stackoverflow.com

I did the download a web page with the HttpURLConnection.getInputStream() and to get the content to a String, i do the following method:

String content="";
isr = new InputStreamReader(pageContent);
br = new BufferedReader(isr);
try {

8. What are the efficiency implications of using BufferedReader?    stackoverflow.com

What is the difference between these 2 methods used to read characters from a file. FIRST

FileReader fr = new FileReader( new File( "file.txt") );
int x = 0;
while( ( x = fr.read() ) ...

9. How to tell BufferedReader to stop reading from System.in?    stackoverflow.com

I am using bufferedReader to read System.in from the user, The user will enter a domain address and source address separated by a space.

Now the problem ...

10. Getting the character returned by read() in BufferedReader    stackoverflow.com

How can I convert an integer returned by the read() in a BufferedReader to the actual character value and then append it to a String? The read() returns the integer that ...

11. Is there a way to tell java BufferedReader to read upto certain point    stackoverflow.com

I am using Java BufferedReader and reading file line by line using bufferedReader.readline(). Is there a way by which I can tell that the line has this much text and Don't read ...

12. Java file does not read from the beginning    stackoverflow.com

I have a file with the following input:

ADD 1 2
SUB 2 1
MUL 2 3
DIV 4 2
with this part of the code:
BufferedReader in = null;
String input = "";
in = new BufferedReader(fin);
while ((input ...

13. Reading the content of outpustream    stackoverflow.com

I have the following code in java that calls the date command in the command prompt:

// prepare command prompt runtime and process
Runtime runtime = null;
Process process = null;

// prepare output stream
OutputStream ...

14. Difference between System.in.read() and BufferedReader.read()    coderanch.com

OK, first off - I hope this question is suitable for the Beginners section, and not the Intermediates ! - I certainly do not consider myself anything other than a Beginner ....... So, here goes nothing ..... Is there a difference in the return value / data type returned of System.in.read() and BufferedReader.read() ? By this, I mean they both return ...

15. BufferedReader not reading first character    coderanch.com

I am reading from a file using this String strLine = inputFile.readLine(); This file is an xml and so the first character in the file is "<". When I write the string back to another file using FileOutputStream, the first character alone is not written. One work around I can think of is appending the "<" first to the file before ...

16. Problem reading a file through BufferedReader    coderanch.com

Hi, I have a problem reading a txt file. An example string from the file is: "amit\nkumar". But If I read this in, with a BufferedReader this becomes Actual Output : "amit\nkumar" Expected Output : "amit kumar" Why is this so? The code is the following: BufferedReader reader= new BufferedReader( new InputStreamReader( new FileInputStream(filename)); while (reader.ready()) { String line= reader.readLine(); } ...

17. Two characters read from file come in the same with BufferedReader    coderanch.com

I'm reading in data from a file which is "packed" (each two values packed into one bit). I can view this data with an unpack utility to verify that it is correct. However, when I bring it in to my Java app, it reads two characters in wrong.. ie: reads both 24 and 85 in as 45. My method of reading ...

18. BufferedReader.read    coderanch.com

Hello all, I am having trouble executing the following program. import java.io.*; class FileTest { public static void main (String[] args) { FileTest t = new FileTest(); t.readMyFile(); } void readMyFile() { int [] record = new int[9]; try { FileReader fr = new FileReader("c:\\a.txt"); BufferedReader br = new BufferedReader(fr); for(int i=0;i<9;i++) { record[i] = br.read(int[]); i++; System.out.println(record[0]); } } catch ...

19. is there a quicker way to read in input besides bufferedreader?    coderanch.com

About your first question: Do you mean to read input from the console window (i.e. ask the user to input a value)? If you're using Java 5 or newer, have a look at the class Scanner (in package java.util). A quick example: import java.util.Scanner; public class Example { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.print("What is ...

22. Reading part of file with BufferedReader    java-forums.org

23. BufferedReader read() method    forums.oracle.com

24. Read a File using BufferedReader ?    forums.oracle.com

//Reads the User Inputted File and Stores Everything in arrays public void ReadFile(String location) { String record = null; int recCount = 0; try { FileReader fr = new FileReader(location); BufferedReader br = new BufferedReader(fr); record = new String(); while ((record = br.readLine()) != null) { recCount++; System.out.println(recCount + ": " + record); } }

25. Why cant my bufferedreader read user inputs within a switch statement?    forums.oracle.com

Also, provide more details about exactly what problem you're having. If you're getting an error message, paste in the exact, complete message, and indicate clearly which line is causing it. If your code is simply not doing what you want, tell us exactly what you want it to do and exactly what it's doing instead. "Doesn't work" contains no useful information. ...

26. any method in BufferedReader can read a string?    forums.oracle.com

a program asks me guess some strings than count how often the guessed string occurs in the message (it gives a part of words),such as : diot cprwueph kpvlglnp ucnlewp nfcmsafmsn nm nfducn nclyluw kpelrfpcbpgn. Hsef ncleqh fpwr zmnf nm klhaslhp embbmg dmckh ugk nm klhnmcn wpnnpc vcpxspgelph vcmb diot gmcb vmc diot wugasuap! Hlblwucwo x dlww cprwuep nfp lgkpvlglnp ucnlewp. ...

27. BufferedReader won't read.    forums.oracle.com

Yeah, I've tried that without success.. Regarding your question: Whenever I create a new "contact" in my adressbook I want that persons name to be written at the bottom of the file adressbok.txt. I also want to do this without using RandomAccessFile. The code you saw was the only way I saw it possible. That's why I first read from the ...

28. Conditional concatenation while reading String from BufferedReader    forums.oracle.com

If you want to do this reliably in all cases your best bet is to parse the code. That's not a trivial undertaking but some of the work has been done for you - there are compiler compilers and grammars for them out there. Search for ANTLR as your first step if you want to go this route.

29. Reading in a file with BufferedReader    forums.oracle.com

I haven't used Java for anything beyond calculations and simulations so my programming skills aren't great. I'm trying to read in a file which contains scientific data. I want to skip two digits, read 5 into one element of an integer array, skip 14 digits, read 5 into another integer array, read another 5 into a third integer array and then ...

30. BufferedReader read(char cbuf[], int off, int len) function    forums.oracle.com

the problem in your code is that the variable i is getting more than the buffer length. {code}public int read(char cbuf[], int off, int len) throws IOException {{code} in the above function i behaves as the offset from where to start storing the characters in the buffer to avoid the index out of bound exception you may need to check whether ...

31. Read stdout from command line with BufferedReader    forums.oracle.com

I have written a Java program that utilizes GNU's wget to retrieve web site content files. I have a major flaw in my setup though as I do not always want to download a very large website as they bog down my RAM and disk space. I do want to download all the content files from over 99% of the websites ...

32. Can you use the BufferedReader to read from a .dll?    forums.oracle.com

I need to get the text from a .dll (the same dll, so its final, if that matters) and then I need to write the .dll using a BufferedWriter to a diffrent location. The problem is I need to get the text of that dll and well if I open it up in notepad then I get all these weird characters ...

33. How to read a java.io.BufferedReader twice    forums.oracle.com

reset requires that you have mark() where you want to reset() to as it states in the documentation. mark() will not throw the same exception as reset(). The simplest thing to do is to close the file and read the data again. mark/reset is only good for short rewinds and it need to keep all the data read in memory.

34. How can i tell read() method from bufferedReader to wait 30s for a stream?    forums.oracle.com

I have a simple code that sends an receives messages to and from a server. But when i try to read the message from the server it blocks/hangs on read(), waiting for a response. How can i tell the applicaton to wait 30 seconds and if nothing comes from the server, to shut the socket? I tried the ready() method but ...

35. BufferedReader read question    forums.oracle.com

Ok somehow I managed to post before finishing writing. Anyway, I'll continue here. As you can see in the above code, I am simply reading the chars and printing them to the command prompt. My question is, why do I never reach the "ok2" string? In the BufferedWriter (I wrote BufferedReader in the post above when I meant BufferedWriter) I just ...

36. Reading Files using BufferedReader    forums.oracle.com

37. reading an int with a BufferedReader()    forums.oracle.com