sigIRCv2/src/sig/FileUtils.java

package sig;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.Reader;
import java.net.URL;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONException;
import org.json.JSONObject;

public class FileUtils {
	public static String[] readFromFile(String filename) {
		File file = new File(filename);
		//System.out.println(file.getAbsolutePath());
		List<String> contents= new ArrayList<String>();
		if (file.exists()) {
			try(
					FileReader fw = new FileReader(filename);
				    BufferedReader bw = new BufferedReader(fw);)
				{
					String readline = bw.readLine();
					do {
						if (readline!=null) {
							//System.out.println(readline);
							contents.add(readline);
							readline = bw.readLine();
						}} while (readline!=null);
					fw.close();
					bw.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
		}
		return contents.toArray(new String[contents.size()]);
	}
	
	  private static String readAll(Reader rd) throws IOException {
	    StringBuilder sb = new StringBuilder();
	    int cp;
	    while ((cp = rd.read()) != -1) {
	      sb.append((char) cp);
	    }
	    return sb.toString();
	  }

	  public static JSONObject readJsonFromUrl(String url) throws IOException, JSONException {
	    InputStream is = new URL(url).openStream();
	    try {
	      BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
	      String jsonText = readAll(rd);
	      JSONObject json = new JSONObject(jsonText);
	      return json;
	    } finally {
	      is.close();
	    }
	  }
	  
	  public static void logToFile(String message, String filename) {
		  File file = new File(filename);
			try {

				if (!file.exists()) {
					file.createNewFile();
				}

				FileWriter fw = new FileWriter(file, true);
				PrintWriter pw = new PrintWriter(fw);

				pw.println(message);
				pw.flush();
				pw.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	  
	  public static void writetoFile(String[] data, String filename) {
		  File file = new File(filename);
			try {

				if (!file.exists()) {
					file.createNewFile();
				}

				FileWriter fw = new FileWriter(file,false);
				PrintWriter pw = new PrintWriter(fw);
				
				for (String s : data) {
					pw.println(s);
				}
				pw.flush();
				pw.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
	  }
	  
	  public static void copyFile(File source, File dest) throws IOException {
		    FileChannel sourceChannel = null;
		    FileChannel destChannel = null;
		    try {
		        sourceChannel = new FileInputStream(source).getChannel();
		        destChannel = new FileOutputStream(dest).getChannel();
		        destChannel.transferFrom(sourceChannel, 0, sourceChannel.size());
		       }finally{
		           sourceChannel.close();
		           destChannel.close();
		   }
		}
}