Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.io.BufferedInputStream;

import java.io.File;

import java.io.IOException;
import java.io.InputStream;

import java.io.OutputStream;
import java.io.Reader;

import java.net.MalformedURLException;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import static java.nio.file.StandardOpenOption.CREATE;
import static java.nio.file.StandardOpenOption.WRITE;

public class Main {
    public static void writeUrlToFileNIO(String urlToRead, String folderToWrite, String fileName)
            throws MalformedURLException, IOException {
        URL urlIn = new URL(urlToRead);
        File folderOut = Paths.get(folderToWrite).toFile();
        if (!(folderOut.exists() || folderOut.mkdirs())) {
            throw new RuntimeException("could not create folder " + folderToWrite);
        }
        Path pathOut = Paths.get(folderToWrite, fileName);
        try (ReadableByteChannel in = Channels.newChannel(new BufferedInputStream(urlIn.openStream()));
                WritableByteChannel out = Files.newByteChannel(pathOut, CREATE, WRITE);) {
            transfer(in, out);
        }
    }

    public static void transfer(InputStream in, OutputStream out) throws IOException {
        byte[] buffer = new byte[4096];
        int bytesRead;
        while ((bytesRead = in.read(buffer)) != -1) {
            out.write(buffer, 0, bytesRead);
        }
    }

    public static void transfer(ReadableByteChannel in, WritableByteChannel out) throws IOException {
        ByteBuffer buffer = ByteBuffer.allocate(4096);
        while (in.read(buffer) != -1) {
            buffer.flip();
            while (buffer.hasRemaining()) {
                out.write(buffer);
            }
            buffer.clear();
        }
    }

    public static void transfer(Reader in, StringBuilder out) throws IOException {
        char[] buffer = new char[4096];
        int charsRead;
        while ((charsRead = in.read(buffer)) != -1) {
            out.append(buffer, 0, charsRead);
        }
    }
}