Java URL Download downloadFile(File parent, String prefix, String suffix, URL url)

Description

Download file.

License

Open Source License

Parameter

Parameter	Description
parent	parent directory, may be <code>null</code> then use 'java.io.tmpdir'
prefix	prefix of temporary file name, may not be <code>null</code> and must be at least three characters long
suffix	suffix of temporary file name, may be <code>null</code>
url	URL for download

Exception

Parameter	Description

Return

downloaded file

Declaration

public static File downloadFile(File parent, String prefix, String suffix, URL url) throws IOException 

Method Source Code

//package com.java2s;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

public class Main {
    /**/*from  w w w  . ja v  a 2s. c  o m*/
     * Download file.
     *
     * @param parent
     *         parent directory, may be <code>null</code> then use 'java.io.tmpdir'
     * @param prefix
     *         prefix of temporary file name, may not be <code>null</code> and must be at least three characters long
     * @param suffix
     *         suffix of temporary file name, may be <code>null</code>
     * @param url
     *         URL for download
     * @return downloaded file
     * @throws java.io.IOException
     *         if any i/o error occurs
     */
    public static File downloadFile(File parent, String prefix, String suffix, URL url) throws IOException {
        File file = File.createTempFile(prefix, suffix, parent);
        URLConnection conn = null;
        final String protocol = url.getProtocol().toLowerCase();
        try {
            conn = url.openConnection();
            if ("http".equals(protocol) || "https".equals(protocol)) {
                HttpURLConnection http = (HttpURLConnection) conn;
                http.setInstanceFollowRedirects(false);
                http.setRequestMethod("GET");
            }
            try (InputStream input = conn.getInputStream(); FileOutputStream fOutput = new FileOutputStream(file)) {
                byte[] b = new byte[8192];
                int r;
                while ((r = input.read(b)) != -1) {
                    fOutput.write(b, 0, r);
                }
            }
        } finally {
            if (conn != null && ("http".equals(protocol) || "https".equals(protocol))) {
                ((HttpURLConnection) conn).disconnect();
            }
        }
        return file;
    }
}

Related

1. downloadAndUnzip(String url, File location)
2. downloadAsString(String url)
3. downloadBinary(URL BaseURL, String Name, File TargetDirectory)
4. downloadData(String url, String params)
5. downloadDirectory(URL dirUrl, File destDir)
6. downloadFile(File target, String urlStr)
7. downloadFile(final String url)
8. downloadFile(String fileURL, String localFileName, String destinationDir)
9. downloadFile(String fileURL, String saveDir)