get Random File - Java java.util

Java examples for java.util:Random

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Description

get Random File

Demo Code


import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;

public class Main{
    public static File getRandomFile() throws IOException {
        File file = File.createTempFile("randomDataUtil", "tmp");
        file.deleteOnExit();//from w  w w.  j  a v  a 2s. c  om

        OutputStream out = new FileOutputStream(file);
        Writer writer = null;
        try {
            writer = new OutputStreamWriter(out, "UTF-8");
            writer.write(getRandomWords(RandomDataUtil
                    .getRandomInt(10, 500)));
            return file;
        } finally {
            if (writer != null) {
                try {
                    writer.close();
                } catch (Exception e) {
                }
            }
        }
    }
    public static String getRandomWords(int wordCount) {
        StringBuilder buf = new StringBuilder();
        for (int i = 0; i < wordCount; i++) {
            if (i > 0) {
                buf.append(" ");
            }
            String word = RandomDataUtil
                    .getRandomAlphaString(RandomDataUtil
                            .getRandomInt(5, 15));
            if (i == 0) {
                word = Character.toUpperCase(word.charAt(0))
                        + word.substring(1).toLowerCase();
            } else {
                word = word.toLowerCase();
            }
            buf.append(word);
        }
        return buf.toString();
    }
    public static String getRandomWords(int min, int max) {
        int wordsToCreate = getRandomInt(min, max);
        return getRandomWords(wordsToCreate);
    }
    public static int getRandomInt() {
        return getRandomInt(1, Integer.MAX_VALUE);
    }
    public static int getRandomInt(int min, int max) {
        return min + (int) ((Math.random() * (max - min)));
    }
    public static String getRandomAlphaString(int length) {
        StringBuilder b = new StringBuilder();
        for (int i = 0; i < length; i++) {
            //   ascii 60 to 90
            char str = (char) (65 + (int) (Math.random() * (90 - 65)));
            b.append(str);
        }

        return b.toString();
    }
}

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