Java File Append Text appendToFile(String filename, String str)

Description

append To File

License

Apache License

Declaration

public static void appendToFile(String filename, String str) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Main {
    public static void appendToFile(String filename, String str) {
        File f = new File(filename);
        String in = "";
        if (f.exists())
            in = read(filename) + str + "\n";
        else//  ww w .  j  a v a  2 s  . co m
            in = str + "\n";

        write(filename, in);
    }

    public static String read(String filename) {
        File f = new File(filename);

        if (!f.exists()) {

            try {
                f.createNewFile();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        try {
            BufferedReader br = new BufferedReader(new FileReader(filename));

            String line;
            String res = "";
            while ((line = br.readLine()) != null) {
                res += line;
            }

            br.close();

            return res;
        } catch (IOException localIOException) {
            localIOException.printStackTrace();
        }

        return null;
    }

    public static void write(String filename, String data) {
        try {
            File f = new File(filename);

            if (f.exists()) {
                f.delete();
                f.createNewFile();
            }

            FileWriter fw = new FileWriter(filename);
            BufferedWriter bw = new BufferedWriter(fw);

            bw.write(data);

            bw.close();

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

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