Reading and displaying from a file

I want my program to be able to read from a file stored on disk and display the contents of the file to a terminal window. I use blueJ if that makes any difference. Can anyone help me with the code to do that please.

Look at the java.io package.
In particular the FileReader, BufferedReader, PrintWriter, and OutputStreamWriter classes.
Read the I/O tutorial (see links on the left).

Similar Messages

Reading and writing from a file

I am trying to read and write to a file so that I may store an array of string and a double in my application, but I have come upon a couple of problems; first when I put my file path into the path constant it will say that the file is not there ever though it is (so I have to force the issue and when the application asks for a file I have to browse and add the files), secondly when I run the program and it reads from the file it does not display the strings or doubles immediately instead I have to hit the submit button and than they finally come up, thirdly when I reset my values in the .txt files and put in my string and double and hit submit the array jumps one spot and starts at the index of 1 (array[1]) if anyone can help I would appreciate it a lot.
here is my code:
Harold Timmis
[email protected]
Orlando,Fl
*Kudos always welcome
Solved!
Go to Solution.
Attachments:
testingfileIO.vi ‏30 KB
double.txt ‏1 KB
string.txt ‏1 KB

Harold Timmis wrote:
I am trying to read and write to a file so that I may store an array of string and a double in my application, but I have come upon a couple of problems; first when I put my file path into the path constant it will say that the file is not there ever though it is (so I have to force the issue and when the application asks for a file I have to browse and add the files),
I don't see that behavior at all about forcing the issue. Why are you using Not a Path constants? Why not turn those constants into controls you put on your front panel?
secondly when I run the program and it reads from the file it does not display the strings or doubles immediately instead I have to hit the submit button and than they finally come up,
Put your array indicators before your event structure rather than after. Think dataflow. The code pauses at the event structure waiting for an even to fire. Only when it does (such as hitting the submit button) does the data get written to the array indicators.
thirdly when I reset my values in the .txt files and put in my string and double and hit submit the array jumps one spot and starts at the index of 1 (array[1]) if anyone can help I would appreciate it a lot.
I don't see this behavior either. How come your double.txt file has names in it, and your string.txt file has doubles in it?

How to read and write from XL file

HI ,
I wanted to read a data from XL file and write a data in XL file by generating a report .Can any body help me out.Many examples are available on discussion forums but when I try to save and run those Vi .I am not able to run Showing error .Please tell what is going wrong as I m having latest labview 8.6 .
Regards
Sharmila.karale

Hi Adnan,
Here are the examples of Vi which I have downloaded from the forum for my reference
Regards
Sharmila.Krale
Attachments:
SAVE TO EXCEL.llb ‏128 KB
excel.llb ‏1618 KB

Include text file and display from text file

Ok. I'm found the site with the monkey on the the flash thing and all it shows is a name, email and something else and I used it and it works by including a txt file and displaying text from that file as putting down this information
name.text = this.name;
and I can't find the site anymore to get help.
I want to know how to include a PHP script that shows this information like this
text=something I need&username=My Name&email=[email protected]
I want to show this stuff on the flash but every time I execute by using it as localhost/test.php, it will show a sentax error.
This is really stressing me out and I need a lot of help on this stuff.
Can someone help me?

ok. let me describe something else.
there's 3 text boxes that is dynamic text.
one of them is called name
the other one is called email
and last one is called location
in the text file, it shows this for importing to the flash file
name=My Name&email=EMAIL&location=My Location
When viewing the flash file that you created, it shows the name, it shows the email, and it shows location.
When I do it on my own even with a text file, it keeps on saying that there is an error on line 1.
I found a site that shows how to do it and it shows what to put in a text file, and it shows the action script. On the FLA file that he shows me has a monkey on the flash file and it has 3 text boxes that I described above. As well as the text file, it is the same. I used the example and it worked but I can't find the example again. I don't know what happened to the website and I don't know what happened to the download I had but it is not downloaded any more. I have adanced systemcare pro so it clears out my recent web searches and my recent downloads so I can't find it. I did a google search on anything about action scripts. I even did a monkey action script search and I couldn't find it.
It's making me mad and I don't know what to do. This is stressing me out way more than you think.
UPDATE:
I did a google search on a file I found in my www folder and I found it. finally.
Here's the site.
http://www.kirupa.com/developer/mx/externaldata.htm
now, I need to figure out how to load it from a PHP file.

READING AND WRITING FROM A FILE(WRITTEN IN ANOTHER LANGUAGE)

# Comment
INTEGER Declares integer type variable
STRING Declares string type variable
LET Assigns a variable
CALCULATE Performs an arithmetic calculation
PRINT Writes data to the console
PRINTLN As print, but followed by a new line
END Terminates the program
Each line of the program must begin with one of these words, and the language should not be case sensitive.
Tim Brailsford, 2007
G64ICP
COMMENT
Any line beginning with the # character is completely ignored.
Example:
# ignore this line!
INTEGER
The INTEGER reserved word declares an Integer variable, and assigns a default value of 0 to it.
Example:
INTEGER myInt
This example is equivalent to the Java statment "int myInt=0;"
STRING
The STRING reserved word declares a String variable, and assigns an empty string to it.
Example:
STRING myString
This is equivalent to the Java statement "String myString;"
LET
This assigns values to variables (either integers, or strings enclosed
in double quotes).
Examples:
LET myInt=42
LET myString="Hello World!"
CALCULATE
This performs numeric calculations upon values or variables, and assigns the result to a variable (which must have
been declared earlier). Four operators are supported: + *
and / (for addition, subtraction multiplication and
integer division respectively).
Examples:
CALCULATE myInt=2*2
CALCULATE myInt=myInt+24
CALCULATE myInt=intA/intB
PRINT and PRINTLN
These words both print to the console the
only difference being that PRINTLN appends a new line (as does
System.out.println in Java). These can print either text provided as an argument, or variables (string or integer).
Examples:
PRINTLN "Hello World!"
PRINT myString
PRINTLN myInt
END
This terminates the program, and prints a message to that effect.
TPL Example
To the left is an example TPL input file , to
calculate the factorial of 5. This should produce
an output similar to that shown overleaf (except
that calculates the factorial of 10).
# A TPL Program to calculate the factorial of 5
INTEGER myInt
INTEGER factorial
STRING myString
LET mystring="Factorial Program"
LET myInt=5
CALCULATE factorial=myInt*4
CALCULATE factorial=factorial*3
CALCULATE factorial=factorial*2
Tim Brailsford, 2007
G64ICP
PRINTLN mystring
PRINTLN
PRINT "The factorial of "
PRINT myInt
PRINT " is "
PRINTLN factorial
END
Documentation
Document your code by writing instructions explaining how to run it, listing all of the files you have submitted,
and specifying any limitations (eg you might want to say what platforms you would expect it to run on, and what
platforms you have tested it on). This document should be written as a plain text file (ie ASCII � MS Word binary
files are not acceptable) � and this file should be called README.TXT. This file should constitute the user
manual of your program, and should explain exactly how to use your program.
The README file should be the user manual for your language as implemented.
NB:
I want it to read values from the file as given above and execute the answer in the command prompt( as intented in the file above)
Thanks
Alam Ikenna

Hai I have one doubt in doing other peoples homework for them. Why bother?

Reading and printing from a file

I have a method that reads temperatures from a data file and prints them to the monitor. I use a while loop to read each line of the file, but for some reason it doesnt skip the loop when readLine returns null. My question is how do i get the method to stop reading before it returns null...
   public static void printFile(String textFile) throws IOException
        String inputString="";
        BufferedReader inputDataFile=
        new BufferedReader(new FileReader(CENTIGRADE_DATA_FILE));
        while(inputString!=null)
            inputString= inputDataFile.readLine();
            System.out.println(inputString);
        inputDataFile.close();


ok cool thanks for pointing that out guys i appreciate it...now i need to take those temps and convert them from Strings to doubles so they can be converted i tried this but im getting a NumberFormatException error...
public static void buildReport() throws IOException
        double centigradeTemp=0.00;
        String inputTemp="";
        //Open centigrade temps to be read and converted
        BufferedReader inputDataFile=
        new BufferedReader(new FileReader(CENTIGRADE_DATA_FILE));
        //Open file writer to write report
        PrintWriter outFile=new PrintWriter(new FileWriter("TempReport.txt"));
        //While loop to read a temp, convert it, and write it in the report
        while((inputTemp= inputDataFile.readLine())!=null)
            centigradeTemp=Integer.parseInt(inputTemp);
            outFile.println(fahrenheit(centigradeTemp));
        outFile.close();
    public static double fahrenheit(double centigrade)
        double fahrenTemp=0.00;
        fahrenTemp=(9/5)*centigrade + 32;
        return fahrenTemp;

Call and display Xcelsius SWF file from an SAP Transaction

Hello Experts ,
Could you please suggest if it is possible to Call and display Xcelsius SWF file
from an SAP Transaction and if Yes how can this be achieved.
Regards ,
Jerin.

Jerin,
It is possible to embed a Xcelsius model into an SAP WebTemplate (Anil promised to write a blog about this very soon). After that you can include the WebTemplate in the GUI menu, Role menu or Portal.
Henk.

How to read and display a signal from my a miccrontroller (MCB1700) onto labview connected via a CAN port on a PXI machine

How do you read and display a signal from my a miccrontroller (MCB1700) onto labview connected via a CAN port on a PXI machine?
I tried using a DAQ Assistant but the CAN port is not included as one of the supported physical channels even though all its drivers are upto date.
Please help..
Thanks.
Solved!
Go to Solution.

Attached herewith is a print screen of what is showing on MAX
The CAN ports are on NI PXI-8461
Hopefully that clarrifies something.
Attachments:
Untitled.png ‏212 KB
Untitled.png ‏212 KB

How to read and display a signal from my PIC Microcontroller onto Labview?

Hi,
I am doing a project on a Pulse Oximeter and i am trying to read and display the signal from my PIC Microcontroller on Labview? How do i go about doing it? I am using the PIC16F877 and also making use of the USART?
How do i implement and initialise the USART in PIC16? What are the steps to be taken, please guide me through the process? The link provides information regarding the USART connection, initialisting and stuff? Is it correct to use these codes in my program?Link: http://ww1.microchip.com/downloads/en/AppNotes/00774a.pdf
Also, i am using the RS232 serial interface to connect to the PC? The connector i am using is the DB9 Connector. Which template and VI can i use? Am i supposed to use the NI-DAQmx and VISA? Also, for my USART connection, i am using the MAX232 Driver which is applicable for my application as i am working with +5V. So far, i have been reading and trying out on Labview and the steps i have taken are:
1) Open a New VI and used the Instrument I/O(Read & Display) template?
2) How do i configure the Instrument I/O Assistant Express VI to read the info from my device connected to COM1?
3) I was reading the Labview Manual, 'Getting Started with Labview' and i was following the steps under Page 55, Communicating with an Instrument. Am i on the right track?
4) How do i check and make sure that the port settings of the I/O Assistant and my PIC Micro Match
Please help me out and guide me through the process. I am student at a polytechnic and i am very new to Labview and the software is used as a development tool for the project. I have a deadline to meet and i hope i can get a response as fast as possible. Your help will be kindly and greatly appreciated. I hope to hear from you guys soon.You can e-mail me all your answers at [email protected]
Thank You
Best regards,
Ashwin
Ashwin Kumar Mansukhani
Attachments:
Getting Started with Labview.pdf ‏901 KB

Hi Ashwin,
It is a good idea to first be able to communicate with the microcontroller using some sort of serial communication software such as "HyperTerminal" or "Procomm", etc. Refer to MicroChip's recommendations on this.
Once that works, then you are ready to use LabView.
Here is a link which covers many aspects of serial communication. Link - click here
You probably received a development kit. They usually have a readily available interface. It's been a long time since I played with the PIC, but I seem to remember that you need to program the serial communication driver (as well as at least a bootloader) to get the serial communication going. The driver contains the necessary protocols so that you PC can have a machine conversation with the target (PIC).
It sounds like a fun & interesting project. Please avoid to have replies to your personal email. By having the answers posted to this thread, you will get much more support and advice.
Have fun,
JLV

How to read and display a signal from my PIC Microcontroller onto Labview

Hi,
I am doing a project on a Pulse Oximeter and i am trying to read and display the signal from my PIC Microcontroller on Labview? How do i go about doing it? I am using the PIC16F877 and also making use of the USART?
How do i implement and initialise the USART in PIC16? What are the steps to be taken, please guide me through the process? The link provides information regarding the USART connection, initialisting and stuff? Is it correct to use these codes in my program?Link: http://ww1.microchip.com/downloads/en/AppNotes/00774a.pdf
Also, i am using the RS232 serial interface to connect to the PC? The connector i am using is the DB9 Connector. Which template and VI can i use? Am i supposed to use the NI-DAQmx and VISA? Also, for my USART connection, i am using the MAX232 Driver which is applicable for my application as i am working with +5V. So far, i have been reading and trying out on Labview and the steps i have taken are:
1) Open a New VI and used the Instrument I/O(Read & Display) template?
2) How do i configure the Instrument I/O Assistant Express VI to read the info from my device connected to COM1?
3) I was reading the Labview Manual, 'Getting Started with Labview' and i was following the steps under Page 55, Communicating with an Instrument. Am i on the right track?
4) How do i check and make sure that the port settings of the I/O Assistant and my PIC Micro Match
Please help me out and guide me through the process. I am student at a polytechnic and i am very new to Labview and the software is used as a development tool for the project. I have a deadline to meet and i hope i can get a response as fast as possible. Your help will be kindly and greatly appreciated. I hope to hear from you guys soon.You can e-mail me all your answers at [email protected]
Thank You
Best regards,
Ashwin
Ashwin Kumar Mansukhani
Attachments:
Getting Started with Labview.pdf ‏901 KB

Hi Ashwin,
I am not familiar with the PIC Microcontrollers, but I am assuming you mean that you have the microcontroller sending out serial data that you want to read on another computer with LabVIEW. Please let me know if this is incorrect.
What type of data is coming out of the serial port? Is it ASCII, or binary? The reason I ask this is that the serial communication in LabVIEW is done through a protocol called VISA, which uses ASCII data to send and receive. You can later convert this data into whatever form you need, but this is what it is designed to read and write.
You can check the settings such as baud rate and data bits in a configuration utility called Measurement and Automation Explorer, or MAX. When you open up the MAX interface, you can expand the Devices and Interfaces entry on the left, and then expand the Ports entry to see your serial port. When you highlight this port, select the Port Settings tab at the bottom of the window, and you can see what the current settings are, and change them if you need to. You can also set these parameters in LabVIEW using the VISA Configure Serial Port VI.
You can also test communication in MAX by right clicking on the correct port and choosing Open VISA Session. Then choose the Basic I/O light blue tab, and then go to the Read tab. When you click execute, it should read in what is coming from the serial port. This will allow you to verify that the correct information is coming in before even trying to acquire the data in the LabVIEW environment.
In LabVIEW, the best resource to use the Basic Serial Write and Read example program that ships with LabVIEW. By examining the block diagram of this program, you will be able to see the basic programming flow of serial communication in LabVIEW.
I hope this information was helpful! Please let us know if there's anything else we can help with.
john
Applications Engineer

Problem on reading and writing from from a *.txt file

I get Problem on reading and writing from from a *.txt file. The following is the read() method...
The software said the DataInputStream is depreciated. Can anyone help me please?
public void read()
    File file = new File("C://Documents and Settings//Charles//My Documents//Brunel//EE2065//Assignment and Lab//Assignment 4 and Lab 4//data.txt");
    FileInputStream in = null;
    String str = "";
    try
      in = new BufferedReader(file);
      //in = new FileInputStream(file);
      for(;;)
        str = new BufferedReader(in).readLine();
        //str = new DataInputStream(in).readLine();
        if(str == null)
          break;
        System.out.print(str);
    in.close();
    catch(IOException e)
        System.err.println("execution error: " +e);
}

Thank you for your reply. I have made some change. However, there is an incompetable type found error.
in = new BufferedReader(new InputStreamReader(in));The following are all of the code.
public void read()
    File file = new File("C://Documents and Settings//Charles//My Documents//Brunel//EE2065//Assignment and Lab//Assignment 4 and Lab 4//data.txt");
    FileInputStream in = null;
    //BufferedReader in = null;
    String str = "";
    try
      in = new BufferedReader(new InputStreamReader(in));
      //in = new FileInputStream(file);
      for(;;)
        BufferedReader Bstr = new BufferedReader(new InputStreamReader(in));
        //str = new BufferedReader(in).readLine();
        //str = new DataInputStream(in).readLine();
        if(str == null)
          break;
        System.out.print(str);
    in.close();
    catch(IOException e)
        System.err.println("execution error: " +e);

How to read the data from Excel file and Store in XML file using java

Hi All,
I got a problem with Excel file.
My problem is how to read the data from Excel file and Store in XML file using java excel api.
For getting the data from Excel file what are all the steps i need to follow to get the correct result.
Any body can send me the code (with java code ,Excel sheet) to this mail id : [email protected]
Thanks & Regards,
Sreenu,
[email protected],
india,

If you want someone to do your work, please have the courtesy to provide payment.
http://www.rentacoder.com

How can I input read a line from a file and output it into the screen?

How can I input read a line from a file and output it into the screen?
If I have a file contains html code and I only want the URL, for example, www24.brinkster.com how can I read that into the buffer and write the output into the screen that using Java?
Any help will be appreciate!
======START FILE default.html ========
<html>
<body>
 
<center>

Welcome to a DerekTran's Website! 
Underconstructions.... 
 </center>
 
Hello, 
 
I've been using the PWS to run the website on NT workstation 4.0. It was working
fine. 
The URL should be as below: 
http://127.0.0.1/index.htm or http://localhost/index.htm
And suddently, it stops working, it can't find the connection. I tried to figure
out what's going on, but still NO CLUES. Does anyone
know what's going on? Please see the link for more.... I believe that I setup
everything correctly and the bugs still flying in the server.... 
Thank you for your help.

PeerWebServer.doc
 
CannotFindServer.doc
 
HOSTS file is not found
 
LMHOSTS file
 
How to Setup PWS on NT
 
Issdmin doc
Please be patient while the document is download....
 If you have any ideas please drop me a
few words at [email protected] 
 
 

 
</body>
</html>
========= END OF FILE ===============

Hi!
This is a possible solution to your problem.
import java.io.*;
class AddressExtractor {
 public static void main(String args[]) throws IOException{
 //retrieve the commandline parameters
 String fileName = "default.html";
 if (args.length != 0) fileName =args[0];
 else {
 System.out.println("Usage : java AddressExtractor <htmlfile>");
 System.exit(0);
 BufferedReader in = new BufferedReader(new FileReader(new File(fileName)));
 StreamTokenizer st = new StreamTokenizer(in);
 st.lowerCaseMode(true);
 st.wordChars('/','/'); //include '/' chars as part of token
 st.wordChars(':',':'); //include ':' chars as part of token
 st.quoteChar('\"'); //set the " quote char
 int i;
 while (st.ttype != StreamTokenizer.TT_EOF) {
 i = st.nextToken();
 if (st.ttype == StreamTokenizer.TT_WORD) {
 if (st.sval.equals("href")) {
 i = st.nextToken(); //the next token (assumed) is the '=' sign
 i = st.nextToken(); //then after it is the href value.
 getURL(st.sval); //retrieve address
 in.close();
 static void getURL(String s) {
 //Check string if it has http:// and truncate if it does
 if (s.indexOf("http://") > -1) {
 s = s.substring(s.indexOf("http://") + 7, s.length());
 //check if not mailto: do not print otherwise
 if (s.indexOf("mailto:") != -1) return;
 //printout anything after http:// and the next '/'
 //if no '/' then print all
 if (s.indexOf('/') > -1) {
 System.out.println(s.substring(0, s.indexOf('/')));
 } else System.out.println(s);
}Hope this helps. I used static methods instead of encapsulating everyting into a class.

How to read the data from a file in another computer with user name and password login

How to read read the data from a file in anohter computer which need to login with user name and password?

duplicate post: http://forums.ni.com/t5/LabVIEW/log-on-the-other-computer-with-user-name-and-password/m-p/2061478
duplicate post: http://forums.ni.com/t5/LabVIEW/do-need-to-enter-the-user-name-and-password-when-TCP-ip/m-p/2061612
duplicate post http://forums.ni.com/t5/LabVIEW/log-on-the-other-computer-with-user-name-and-password/m-p/2060682

Kinect Explorer WPF C# read depth data from the file and conversion to skeleton

Hello,
I am using Kinect sensor to do some research on biometrics. Since it is impossible to find people to collect some samples, I would like to use samples from the TUM - GAID database, where there exist Color View and Depth View (in .raw format) samples. Therefore,
I need to read these samples from the file and do a batch processing, instead of performing real-time collecting of samples (where I can take automatically the Skeleton view using the Kinect SDK). So, I need help on
1. Reading the data from the file (instead of activating the Kinect sensor) and give this data as an input for conversion to a skeleton
2. Read the .raw files
Thank you very much
Kind regards

Hiya,
I doubt this forum, C Sharp, will provide much help. You are asking about the Kinects system not C#
language. However, you can try this link; http://kinectforwindows.codeplex.com/
Hope this help. Thanks :)

Reading and displaying from a file

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