Java input parameter from text file

Question

I want to know how I can get data from a text file to a java program from the command line. I am using windows.

I used

Java myprogram < c:\inputfile.txt

it doesn't work, but when I used

Java myprogram good

it works. 'good' is the word that i used it as input

FYI: when I used

Java myprogram good > c:\outfile.txt

this is for writing output to a text file ..

I need to read from the text file "inputfile.txt" and write to "outputfile.txt"

i used this

Java myprogram "c:\\inputfile.txt" > "c:\\outputfile.txt"

but not working

This code that i used it

import edu.smu.tspell.wordnet.*;

public class myprogram{
public static void main (String [] args) {

System.setProperty("wordnet.database.dir", "C:\\Program Files (x86)\\WordNet\\2.1\\dict\\");
WordNetDatabase database = WordNetDatabase.getFileInstance();
      String result = "";
        NounSynset nounSynset;
        NounSynset[] hyponyms;
        Synset[] synsets = database.getSynsets(args[0]);

        for (int i = 0; i < synsets.length; i++) { //iteratre over all senses
            String[] wordForms = synsets[i].getWordForms();
            for (int j = 0; j < wordForms.length; j++) {
                System.out.println(wordForms[j]);
            }

} 

}
}

score 2 · Accepted Answer · answered Apr 06 '13 at 05:16

2

If you need to read input data from file then you need to write code for reading text file in your Java class to read.

It appears that your code is just getting input from command line and your are treating that command line argument as data.

See this example on how to read inputs from a text file.

answered Apr 06 '13 at 05:16

anubhava

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thanks anubhava, please can you help me how can i used it in above java code – Dheya Majid Apr 06 '13 at 05:31
@DheyaMajid: Please see the link I provided. – anubhava Apr 06 '13 at 05:31
Thanks, buy i want to read it word by word and put word to args[0] – Dheya Majid Apr 06 '13 at 05:35
As per your question you want to pass in the file name to your Java code and read file content from inside the Java code. Is my interpretation not correct? – anubhava Apr 06 '13 at 05:38
Yes , that correct , i need to read the content word by word. because i want to used that word for another processing. – Dheya Majid Apr 06 '13 at 06:00
Then use Scanner class for reading file line by line and split each line into different words. – anubhava Apr 06 '13 at 06:05
Ok, i want to know how can i split words, do you have any example – Dheya Majid Apr 06 '13 at 06:08

score 0 · Answer 2 · answered Apr 06 '13 at 05:07

0

Pass the value in double quotes like this :

Java myprogram good > "c:\\inputfile.txt"

answered Apr 06 '13 at 05:07

Ankur Shanbhag

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i used Java myprogram "c:\\inputfile.txt"> "c:\\outputfile.txt" in CMD but not working – Dheya Majid Apr 06 '13 at 05:14
where is the code to read the file? You need to write code to read the input file. Similarly for writing to a file. – Ankur Shanbhag Apr 06 '13 at 05:35

score 0 · Answer 3 · edited May 23 '17 at 10:32

Below cmd will works only in unix flavor OS.

      java classfile > "/path/logfilename.log"

Below program will read the file and write to a different file ( You can do improvements as per your use case)

    public class ReadWriteFile {

        public static void main(String args[]) throws Exception {

        if (args.length == 0) {
            System.out.println("Enter the file name");
        } else {

            String fileName = args[0];

            BufferedReader input = new BufferedReader(new FileReader(fileName));

            String line = null;

            BufferedWriter writer = new BufferedWriter( new FileWriter( "output.txt"));

            try {
                while (( line = input.readLine()) != null){
                    System.out.println(line);
                    //or
                    writer.write(line);
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if(input != null) input.close();                
                if ( writer != null) writer.close( );
            }
        }
    }

}

For character by character reading refer the below how-do-i-read-input-character-by-character-in-java

Java input parameter from text file

3 Answers3