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Thread: Create a file specifying the size JAVA

  1. #1
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    Default Create a file specifying the size JAVA

    Good, I wondered if someone could resolve my doubts.
    I would like to create a file, specifying the size and the content. That is, 10 Megabytes for example random numbers and content.
    A greeting.


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    Member Darryl.Burke's Avatar
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    Default Re: Create a file specifying the size JAVA


  3. #3
    mmm.. coffee JavaPF's Avatar
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    Default Re: Create a file specifying the size JAVA

    Hello and welcome to the forums.

    Here is a crude example for you. It should give you an idea about what you need to do..

    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.io.Writer;
     
    public class FileProg {
     
    	/**
    	 * JavaProgrammingForums.com
    	 */
     
    	//100000000 bytes = 10mb
    	public static int setSize = 100000000;
     
    	public static void main(String[] args) throws IOException {
     
            FileProg fp = new FileProg();
            String newline = System.getProperty("line.separator");
     
            // Create file
    		Writer output = null;
    		File file = new File("file.txt");
    		output = new BufferedWriter(new FileWriter(file, true));
    		output.write("");
    		output.write(newline);
     
    		// Get file size in bytes
            long size = fp.getFileSize("file.txt");
     
            // Write file whilst the size is smaller than setSize
    		while(size < setSize){
    		output.write("Java Programming Forums");
    		output.write(newline);
     
    		size = fp.getFileSize("file.txt");
    		System.out.println(size + " bytes");
    		}
     
    		output.close();
    		System.out.println("Finished at - " + size);
     
    	}
     
    	// File size code
        public long getFileSize(String filename) {
            File file = new File(filename);        
            	if (!file.exists() || !file.isFile()) {
            		System.out.println("File does not exist");
            		return -1;
            	}
            return file.length();
          }
    }
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  4. #4
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    Default Re: Create a file specifying the size JAVA

    Quote Originally Posted by JavaPF View Post
    Hello and welcome to the forums.

    Here is a crude example for you. It should give you an idea about what you need to do..

    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.io.Writer;
     
    public class FileProg {
     
    	/**
    	 * JavaProgrammingForums.com
    	 */
     
    	//10000000 bytes = 10mb
    	public static int setSize = 10000000;
     
    	public static void main(String[] args) throws IOException {
     
            FileProg fp = new FileProg();
            String newline = System.getProperty("line.separator");
     
            // Create file
    		Writer output = null;
    		File file = new File("file.txt");
    		output = new BufferedWriter(new FileWriter(file, true));
    		output.write("");
    		output.write(newline);
     
    		// Get file size in bytes
            long size = fp.getFileSize("file.txt");
     
            // Write file whilst the size is smaller than setSize
    		while(size < setSize){
    		output.write("Java Programming Forums");
    		output.write(newline);
     
                    //flush for the file to get updated on size and content
                    output.flush();
     
    		size = fp.getFileSize("file.txt");
    		System.out.println(size + " bytes");
    		}
     
    		output.close();
    		System.out.println("Finished at - " + size);
     
    	}
     
    	// File size code
        public long getFileSize(String filename) {
            File file = new File(filename);        
            	if (!file.exists() || !file.isFile()) {
            		System.out.println("File does not exist");
            		return -1;
            	}
            return file.length();
          }
    }
    i fear you forgot to flush the string so it will write and size will get updated, but other then that - thank you very much, added the missing flush.
    helped alot

    --==edit==--
    lol, well that extra 0 on the mb number caught me by surprise
    careful, thats 100mb and not 10mb
    i fixed the digits on my quote of your code.
    Last edited by IronWolf; September 20th, 2012 at 10:35 AM.

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