Java Is Text File isText(File file)

Description

is Text

License

Open Source License

Declaration

public static boolean isText(File file) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.*;

public class Main {
    public static boolean isText(File file) {
        try {/*  ww w.  ja  va 2s . co m*/
            // Get first 512 bytes of file
            byte[] buf = new byte[512];
            FileInputStream in = new FileInputStream(file);
            int len = in.read(buf);
            in.close();

            // Empty files are considered text
            if (len == 0)
                return true;

            int numNonTextChars = 0;
            for (int i = 0; i < len; i++) {
                // Files with null bytes are likely binary
                if (buf[i] == 0)
                    return false;

                // Count non-text characters
                if (buf[i] < 32 || buf[i] >= 127)
                    numNonTextChars++;
            }
            // Filse with less than 30% non-text characters are considered text
            return numNonTextChars / (double) len < 0.30;
        } catch (IOException e) {
            return false;
        }
    }
}

Related

1. isText(File file)
2. isTextFile(File f)
3. isTextFile(File f, int length)
4. isTextFile(File file)