Java URL Download download(final URL url)

Description

Will download file data ready to be exported to a file

License

Open Source License

Parameter

Parameter	Description
url	The valid URL you wish to read data from

Exception

Parameter	Description
IOException	an exception

Return

byte array of data. Building a file from this is safe

Declaration

public static byte[] download(final URL url) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.*;
import java.net.URL;

public class Main {
    /**//w w w .ja v  a2s  .c  o m
     * Will download file data ready to be exported to a file
     *
     * @param url The valid URL you wish to read data from
     * @return byte array of data. Building a file from this is safe
     * @throws IOException
     * @since 1.0
     */
    public static byte[] download(final URL url) throws IOException {
        return readData(url.openStream());
    }

    /**
     * This will read a local file and return data which can be manipulated easily
     *
     * @param file Will load data from a local file
     * @return byte array of data. Building a file or modification of a file from this is safe
     * @throws IOException
     * @since 1.0
     */

    public static byte[] readData(final File file) throws IOException {
        return readData(new FileInputStream(file));
    }

    /**
     * Reads data from an input stream, either a File or URL
     *
     * @param in input stream to read data from. Allocates 1024 bytes per cycle
     * @return a mutable byte array for file storing or manipulation
     * @throws IOException
     * @see {org.powerbat.methods.IOUtils.download(URL);}
     * @see {org.powerbat.methods.IOUtils.readData(File);}
     * @since 1.0
     */

    private static byte[] readData(final InputStream in) throws IOException {
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        final byte[] data = new byte[1024];
        int read;
        while ((read = in.read(data, 0, 1024)) != -1) {
            out.write(data, 0, read);
        }
        in.close();
        return out.toByteArray();
    }

    /**
     * Writes a file and byte data to a specific destination
     *
     * @param file The file to be written to, does not necessarily have to exist.
     * @param data The data to be written. It is best used with url-based files
     * @throws IOException
     * @see {IOUtils.download(URL);}
     * @since 1.0
     */

    public static void write(final File file, final byte[] data) throws IOException {
        final FileOutputStream out = new FileOutputStream(file);
        out.write(data);
        out.close();
    }
}

Related

1. downImg(String filePath, String imageUrl, String fileName)
2. download(final String sURL, final String sFilename)
3. download(String downloadUrlStr, String filename)
4. download(String fileUrl, String savePath, String fileName)
5. download(String url)
6. download(String url, String path)