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Redirecting the console output into a file in Java
1 Answer(s)      3 years and 11 months ago
Posted in : Java Beginners


Hi,

i coded a program that read specific lines from a text file. It's working well. Now i want to redirect the output of the console to a text file.

i used your tutorial, but it's not working for me.

Could you please help for this code.

[CODE] import java.io.*; import java.io.PrintStream.*; import java.io.PrintWriter.*; import java.io.FileOutputStream;

public class ReadSpecificLine2

{ public static void main(String[] args) throws IOException { BufferedReader in = new BufferedReader (new FileReader("C://Temp/File.txt"));

String info = "";
int startLine = 15;
int endLine = 20;
    int startLine2 = 30;
    int endLine2 = 40;

for (int i = 0; i < startLine; i++)
    {
        info = in.readLine();
    }

for (int i = startLine; i < endLine + 1; i++)
    {
    info = in.readLine();
    System.out.println(info);
}


    for (int i = 0; i < startLine2; i++)
    {
        info = in.readLine();
    }

for (int i = startLine2; i < endLine2 + 1; i++)
    {
    info = in.readLine();



    System.out.println(info);

           //System.setOut(new PrintStream(new FileOutputStream("C://Temp/Target.txt")));
           //PrintWriter out = new PrintWriter(new FileOutputStream("c:\\Temp\\Target.txt"));
           //System.setOut(out);


}




in.close();

}}

[CODE/]

Thank you


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View Answers

January 24, 2011 at 11:59 AM


Hi Friend,

Try the following code:

import java.io.*;

public class ReadSpecificLine {
    public static void main(String[] args) {
        StringBuffer buffer = new StringBuffer();
        String line = "";
        int lineNo=0;
            try {
            LineNumberReader ln = new LineNumberReader(new FileReader("C:/hello.txt"));
            int count = 0;
            while (ln.readLine() != null) {
                count++;
            }
            ln.close();
            FileReader fr = new FileReader("C:/hello.txt");
            BufferedReader br = new BufferedReader(fr);
            for (lineNo = 1; lineNo <= count; lineNo++){
                if (lineNo == 2) {
                    for (lineNo = 2; lineNo <= 4; lineNo++) {
                        buffer.append(br.readLine());
                        buffer.append("\n");
                    }
                } else
                    br.readLine();
            }

        BufferedWriter bw=new BufferedWriter(new FileWriter(new File("C:/new.txt"),true));
        bw.write(buffer.toString());
        bw.newLine();
        bw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Thanks



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