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A wrapper for the DotA2 WebAPI written in Java.
There is a newer version: 1.0.4
package com.github.kaisle.util;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

/**
 * Created by Anders Borum on 03-06-2015.
 */
public class FileUtil {

    /**
     * Get the index of the first line in the file that contains the specified string.
     * @param file The file to search through.
     * @param searchString The string to search for.
     * @return The index of the line if the string is present in the file contents, or -1 if not.
     */
    public static int findLine(File file, String searchString) {
        try {
            List lines = FileUtils.readLines(file);
            for (int i = 0; i < lines.size(); i++) {
                if (lines.get(i).contains(searchString)) {
                    return i;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return -1;
    }

    /**
     * Append a line to a file.
     * @param file
     * @param content
     */
    public static void appendLine(File file, String content) {
        try {
            List lines = FileUtils.readLines(file);
            lines.add(content);
            FileUtils.writeLines(file, lines);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * Append a line to a file.
     * @param file
     * @param content
     */
    public static void appendLinesToMiddle(File file, List content, int lineNumber) {
        try {
            List lines = FileUtils.readLines(file);
            for (int i = 0; i < content.size(); i++) {
                lines.add(lineNumber + i, content.get(i));
            }
            FileUtils.writeLines(file, lines);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * Replace a line in a file.
     * @param file The file to write to.
     * @param lineContent The content to write.
     * @param lineNumber The line number.
     */
    public static void modifyLine(File file, String lineContent, int lineNumber) {
        try {
            List lines = FileUtils.readLines(file);
            lines.set(lineNumber, lineContent);
            FileUtils.writeLines(file, lines);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * Get the current workign directory.
     * @return
     */
    public static String getWorkingDirectory() {



        return System.getProperty("user.dir");
    }

    public static void ensureFileExists (String directory, String fileName) {
        try {
            if (!FileUtils.directoryContains(new File(directory), new File(fileName))) {
                new File(directory + "/" + fileName).createNewFile();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * Remove lines in the file that contain a given string.
     * @param file
     * @param content
     */
    public static void removeLines(File file, String content) {
        try {
            List lines = FileUtils.readLines(file);
            Iterator linesIterator = lines.iterator();
            while (linesIterator.hasNext()) {
                String line = linesIterator.next();
                if (line.contains(content)) {
                    linesIterator.remove();
                }
            }
            FileUtils.writeLines(file, lines);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}