Java URL Copy copyURLToFile(final URL source, final File destination)

Description

copy URL To File

License

Apache License

Declaration

public static void copyURLToFile(final URL source, final File destination) throws IOException 

Method Source Code

//package com.java2s;
/**/*from  ww  w  .j av  a 2 s.  c  om*/
 * Copyright (C) 2011 Ovea <dev@ovea.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.net.URL;

public class Main {
    private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;

    public static void copyURLToFile(final URL source, final File destination) throws IOException {
        if (destination.getParentFile() != null && !destination.getParentFile().exists()) {
            destination.getParentFile().mkdirs();
        }
        // Make sure we can write to destination
        if (destination.exists() && !destination.canWrite()) {
            throw new IllegalArgumentException("Unable to open file " + destination + " for writing.");
        }
        InputStream in = new BufferedInputStream(source.openStream());
        copy(in, destination);
        in.close();
    }

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

    public static void copy(Reader input, Writer output) throws IOException {
        char[] buffer = new char[DEFAULT_BUFFER_SIZE];
        int n;
        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
        }
    }

    public static void copy(InputStream in, File dest) throws IOException {
        OutputStream out = new BufferedOutputStream(new FileOutputStream(dest));
        try {
            copy(in, out);
        } finally {
            out.flush();
            out.close();
        }
    }

    public static String read(File file) throws IOException {
        return read(file.toURI().toURL());
    }

    public static String read(URL file) throws IOException {
        BufferedReader input = new BufferedReader(new InputStreamReader(file.openStream()));
        try {
            StringWriter sw = new StringWriter();
            copy(input, sw);
            return sw.toString();
        } finally {
            input.close();
        }
    }
}

Related

1. copyFromURL(final String query, final File target)
2. copyRemoteFile(URL url, File localFile)
3. copyResource(URL from, File to)
4. copyResource(URL resource, File destination)
5. copyUrlBinaryFile(String fileName, String sourceUrlPath, String destPath)
6. copyURLToFile(URL source, File destination)