We Keep Coding

File copier is printing out my whole excerpt, I want it to do it line by line with user input between

I need my program to print this file line by line, waiting for the user to press enter between each one. My code keeps printing the whole excerpt. What do I need to change?
import java.io.*;
import java.util.*;
public class NoteCopier {
public static void main(String[] args) throws IOException {
System.out.println("Hello! I copy an excerpt to the screen line for line"
+ " just press enter when you want a new line!");
try {
File file = new File("excerpt.txt");
FileInputStream fis = new FileInputStream(file);
InputStreamReader inreader = new InputStreamReader(fis);
BufferedReader reader = new BufferedReader(inreader);
String line = reader.readLine();
Scanner scan = new Scanner(System.in);
while(true) {
String scanString = scan.nextLine();
if(line != null) {
if(scanString.isEmpty()){
System.out.println(line);
line = reader.readLine();
}
else {
scanString = null;
break;
}
}
}
}
catch(IOException e) {
e.printStackTrace();
}
}
}

If line is null you'll loop forever; the nested if statements.
I did it in the new Stream style, without the ubiquitous but needless Scanner on System.in.
private void dump(String file) {
Path path = Paths.get(file);
BufferedReader con = new BufferedReader(new InputStreamReader(System.in));
try (Stream<String> in = Files.lines(path, Charset.defaultCharset())) {
AtomicInteger lineCounter = new AtomicInteger();
in.forEach(line -> {
System.out.println(line);
if (lineCounter.get() == 0) {
String input = null;
try {
input = con.readLine();
} catch (IOException e) {
}
if (input == null) {
throw new IndexOutOfBoundsException();
} else if (input.equals(" ")) {
lineCounter.set(10);
}
} else {
lineCounter.decrementAndGet();
}
});
} catch (IndexOutOfBoundsException e) {
System.out.println("< Stopped.");
} catch (IOException e) {
e.printStackTrace();
}
}
With CtrlD you can exit on Windows I believe.
I have added that a line with a Space will dump the next 10 lines.
The ugly thing are the user input lines.
With java.io.Console one can ask input with a String prompt, which then can be used to print the file's line as prompt.
private void dump(String file) {
Path path = Paths.get(file);
Console con = System.console();
try (Stream<String> in = Files.lines(path, Charset.defaultCharset())) {
AtomicInteger lineCounter = new AtomicInteger();
in.forEach(line -> {
if (lineCounter.get() == 0) {
//String input = con.readLine("%s |", line);
String input = new String(con.readPassword("%s", line));
if (input == null) {
throw new IndexOutOfBoundsException();
} else if (input.equals(" ")) {
lineCounter.set(10);
}
} else {
System.out.println(line);
lineCounter.decrementAndGet();
}
});
} catch (IndexOutOfBoundsException e) {
System.out.println("< Stopped.");
} catch (IOException e) {
e.printStackTrace();
}
}
Using a prompt with the file's line, and asking a non-echoed "password" will be sufficient okay. You still need the Enter.
There is one problem: you must run this as real command line. The "console" in the IDE uses System.setIn which will cause a null Console. I simply create a .bat/.sh file. Otherwise System.out.print(line); System.out.flush(); might work on some operating system.

Parsing strings with split JAVA

I'm trying to find an object in a list from a text file
Example:
L;10;€10,50;83259875;YellowPaint
-H;U;30;€12,00;98123742;Hammer
G;U;80;€15,00;87589302;Seeds
By inserting 98123742 by input with scanner, i want to find that string.
I tried to do this:
private static void inputCode() throws IOException {
String code;
String line = null;
boolean retVal = false;
System.out.println("\ninsert code: ");
code = in.next();
try {
FileReader fileReader = new FileReader("SHOP.txt");
BufferedReader bufferedReader = new BufferedReader(fileReader);
while ((line = bufferedReader.readLine()) != null) {
String[] token = line.split(";");
if (token[0].equals(code) && token[1].equals(code)) {
retVal = true;
System.out.println(line);
}
}
bufferedReader.close();
} catch (FileNotFoundException ex) {
System.out.println("impossible open the file " + fileName);
}
catch(IOException ex) {
System.out.println(
"Error reading file '"
+ fileName + "'");
}
System.out.println(retVal);
}
How can i print "-H;U;30;€12,00;98123742;Hammer" inserting "98123742" (that is the code of the product) ?

Why are you splitting in the first place? For such a simple usecase, and with that line format, I'd go with
line.contains(";" + code);
Not much else to do.

I am not able to write all data to a file

I have written the Java code to read from one file and write to a new file. The file from which I am reading has 5000 lines of records, but when I am writing to a new file I am able to write only between 4700-4900 records.
I think may be I am simultaneously reading from a file and writing to a file, which might be creating a problem.
My code is as follows:
Reading from a file:
public String readFile(){
String fileName = "/home/anand/Desktop/index.txt";
FileReader file = null;
try {
file = new FileReader(fileName);
BufferedReader reader = new BufferedReader(file);
String line = "";
while ((line = reader.readLine()) != null) {
line.replaceAll("ids", "");
System.out.println(line);
returnValue += line + "\n";
}
return returnValue;
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (file != null) {
try {
file.close();
} catch (IOException e) {
// Ignore issues during closing
}
}
}
}
Writing to a file:
public void writeFile(String returnValue){
String newreturnValue = returnValue.replaceAll("[^0-9,]", "");
String delimiter = ",";
String newtext ="";
String[] temp;
temp = newreturnValue.split(delimiter);
FileWriter output = null;
try {
output = new FileWriter("/home/anand/Desktop/newinput.txt");
BufferedWriter writer = new BufferedWriter(output);
for(int i =0; i < temp.length ; i++){
writer.write("["+i+"] "+temp[i]);
writer.newLine();
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (output != null) {
try {
output.close();
} catch (IOException e) {
// Ignore issues during closing
}
}
}
}
I need the suggestion to how to simultaneously read and write to a file.

You need to close writer instead of output. The BufferedWriter may not be writing all of the lines, and won't since you never close it.

You have to close the writer object. The last couple lines probably haven't been flushed onto the text file.
In addition, are you aware of the try-with-resource introduced in Java 7? You can condense your code to this by utilizing it:
public String readFile(){
String fileName = "/home/anand/Desktop/index.txt";
try(BufferedReader reader = new BufferedReader(new FileReader(filename)) {
String line = "";
while ((line = reader.readLine()) != null) {
line.replaceAll("ids", "");
System.out.println(line);
returnValue += line + "\n";
}
return returnValue;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
By doing this, Java will automatically close the reader object for you once the try block completes, regardless of whether or not an exception was thrown. This makes it easier to read your code :)

Java : Can't capture console output of a console program (Blockland.exe)

I'm trying to capture the output of a console program and write overwriting lines of the output to a file which another program will read, line by line I write into this file (the file should only contain one line at a time) but when I made this code and tried running it, it didn't work. The process started perfectly, but the file is not being created, written to, and I am not getting any System.out.println's of "Streaming : blah blah blah"
You can read the code below or use this pastebin : http://pastebin.com/raw.php?i=Yahsqxma
import java.io.*;
import java.util.Scanner;
public class OpenRC {
static BufferedReader consoleInput = null;
static String os = System.getProperty("os.name").toLowerCase();
static Process server;
public static void main(String[] args) throws IOException {
// OpenRC by Pacnet2013
System.out.println(System.getProperty("user.dir"));
if(os.indexOf("win") >= 0) {
os = "Windows";
}
else if(os.indexOf("mac") >= 0) {
os = "Mac";
}
else if(os.indexOf("nux") >= 0) {
os = "Linux";
}
switch(os){
case "Linux" : //cause I need WINE
File file = new File(System.getProperty("user.dir") + "/OpenRC.txt");
try {
Scanner scanner = new Scanner(file);
String path = scanner.nextLine();
System.out.println("Got BlocklandEXE - " + path);
String port = scanner.nextLine();
System.out.println("Got port - " + port);
scanner.close();
server = new ProcessBuilder("wine", path + "Blockland.exe", "ptlaaxobimwroe", "-dedicated", "-port" + port).start();
if(consoleInput != null)
consoleInput.close();
consoleInput = new BufferedReader(new InputStreamReader(server.getInputStream()));
streamLoop();
} catch (FileNotFoundException e) {
System.out.println("You don't have an OpenRC Config file OpenRC.txt in the directory of this program");
}
}
}
public static void streamConsole()
{
String line = "";
int numLines = 0;
try
{
if (consoleInput != null)
{
while((line = consoleInput.readLine()) != null && consoleInput.ready())
{
numLines++;
}
}
}
catch (IOException e)
{
System.out.println("There may be a problem - An IOException (java.io.IOException) was caught so some lines may not display / display correctly");
}
if(!line.equals("") && !(line == null))
{
System.out.println("Streaming" + numLines + line);
writeToFile(System.getProperty("user.dir"), line);
}
}
public static void streamLoop()
{
try
{
Thread.sleep(5000);
}
catch (InterruptedException e)
{
System.out.println("A slight problem may have happened while trying to read a command");
}
streamConsole();
streamLoop(); //it'll go on until you close this program
}
public static void writeToFile(String filePath, String content)
{
try {
File file = new File(filePath);
if (!file.exists()) {
file.createNewFile();
System.out.println("Creating new stream text file");
}
FileWriter writer = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(writer);
bw.write(content);
bw.close();
System.out.println("Wrote stream text file");
} catch (IOException e) {
e.printStackTrace();
}
}
}

You are running a DOS console application, which does not necessarily write to stdout or stderr, but it writes to the "console". It's nearly impossible to capture the "console" output reliably. The only tool that I have ever seen that is able to capture console output is expect by Don Libes, and that does all sorts of hacks.

very long string as a response of web service

I am getting a really long string as the response of the web service I am collecting it in the using the StringBuilder but I am unable to obtain the full value I also used StringBuffer but had no success.
Here is the code I am using:
private static String read(InputStream in ) throws IOException {
//StringBuilder sb = new StringBuilder(1000);
StringBuffer sb = new StringBuffer();
String s = "";
BufferedReader r = new BufferedReader(new InputStreamReader( in ), 1000);
for (String line = r.readLine(); line != null; line = r.readLine()) {
sb.append(line);
s += line;
} in .close();
System.out.println("Response from Input Stream Reader >>>" + sb.toString());
System.out.println("Response from Input S >>>>>>>>>>>>" + s);
return sb.toString();
}
Any help is appreciated.

You can also split the string in array of strings in order to see all of them
String delimiter = "put a delimiter here e.g.: \n";
String[] datas=sb.toString().split(delimiter);
for(String string datas){
System.out.println("Response from Input S >>>>>>>>>>>>" + string);
}

The String may not print entirely to the console, but it is actually there. Save it to a file in order to see it.

I do not think that your input is too big for a String, but only not shown to the console because it doesn't accept too long lines. Anyways, here is the solution for a really huge input as characters:
private static String[] readHugeStream(InputStream in) throws IOException {
LinkedList<String> dataList = new LinkedList<>();
boolean finished = false;
//
BufferedReader r = new BufferedReader(new InputStreamReader(in), 0xFFFFFF);
String line = r.readLine();
while (!finished) {
int lengthRead = 0;
StringBuilder sb = new StringBuilder();
while (!finished) {
line = r.readLine();
if (line == null) {
finished = true;
} else {
lengthRead += line.length();
if (lengthRead == Integer.MAX_VALUE) {
break;
}
sb.append(line);
}
}
if (sb.length() != 0) {
dataList.add(sb.toString());
}
}
in.close();
String[] data = dataList.toArray(new String[]{});
///
return data;
}
public static void main(String[] args) {
try {
String[] data = readHugeStream(new FileInputStream("<big file>"));
} catch (IOException ex) {
Logger.getLogger(StackoverflowStringLong.class.getName()).log(Level.SEVERE, null, ex);
} catch (OutOfMemoryError ex) {
System.out.println("out of memory...");
}
}

System.out.println() does not print all the characters , it can display only limited number of characters in console. You can create a file in SD card and copy the string there as a text document to check your exact response.
try
{
File root = new File(Environment.getExternalStorageDirectory(), "Responsefromserver");
if (!root.exists())
{
root.mkdirs();
}
File gpxfile = new File(root, "response.txt");
FileWriter writer = new FileWriter(gpxfile);
writer.append(totalResponse);
writer.flush();
writer.close();
}
catch(IOException e)
{
System.out.println("Error:::::::::::::"+e.getMessage());
throw e;
}