Java/File Input Output/PrintStream

Append string to a text file

  
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintStream;
public class Main {
  public static void main(String[] argv) {
    append(new File("c:\\a.txt"), "value");
  }
  public static void append(File aFile, String content) {
    try {
      PrintStream p = new PrintStream(new BufferedOutputStream(new FileOutputStream(aFile, true)));
      p.println(content);
      p.close();
    } catch (Exception e) {
      e.printStackTrace();
      System.err.println(aFile);
    }
  }
}

Create print stream for error logger

  

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
public class Main {
  public static void main(String[] argv) throws Exception {
    try {
    } catch (Exception e) {
      e.printStackTrace(getErrorLoggerPrintStream());
    }
  }
  public static PrintStream getErrorLoggerPrintStream() {
    try {
      PrintStream s = new PrintStream(new FileOutputStream(new File("c:\\log.txt"), true));
      return s;
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
    return null;
  }
}

Save string value to a file

  
import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintStream;
public class Main {
  public static void main(String[] argv) {
    saveFile("c:\\a.txt", "value");
  }
  public static void saveFile(final String fileName, final String str) {
    try {
      File f = new File(fileName);
      if (new File(f.getParent()).exists() == false) {
        f.getParentFile().mkdirs();
      }
      f.createNewFile();
      PrintStream p = new PrintStream(new FileOutputStream(f, false));
      p.println(str);
      p.close();
    } catch (Exception e) {
      e.printStackTrace();
      System.err.println(fileName);
    }
  }
}