Java URL Download downloadAndExtract(String fileURL, String targetDirectory)

Description

download And Extract

License

Apache License

Declaration

public static void downloadAndExtract(String fileURL, String targetDirectory) throws Exception

Method Source Code


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

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class Main {
    public static void downloadAndExtract(String fileURL, String targetDirectory) throws Exception {
        File file = downloadFile(fileURL, targetDirectory);
        unzip(file, targetDirectory);//from   w  w  w. j a  v a  2s .c o  m
    }

    public static File downloadFile(String fileURL, String targetDirectory) throws Exception {

        System.out.println("Retrieving: " + fileURL);

        String cacheDir = System.getProperty("cacheDirectory");
        if (cacheDir == null) {
            cacheDir = System.getProperty("java.io.tmpdir") + File.separator + "pdt-test-cache";
        }
        new File(cacheDir).mkdirs();

        URL url = new URL(fileURL);
        String fileName = url.getFile().substring(url.getPath().lastIndexOf('/') + 1);

        File cachedFile = new File(cacheDir, fileName);
        if (!cachedFile.exists()) {

            URLConnection urlConnection = url.openConnection();
            InputStream inputStream = new BufferedInputStream(urlConnection.getInputStream());
            FileOutputStream outputStream = new FileOutputStream(cachedFile);
            byte[] bytes = new byte[8192];
            int count = inputStream.read(bytes);
            while (count != -1 && count <= bytes.length) {
                outputStream.write(bytes, 0, count);
                count = inputStream.read(bytes);
            }
            if (count != -1) {
                outputStream.write(bytes, 0, count);
            }
            inputStream.close();
            outputStream.close();

        } else {
            System.out.println("File: " + cachedFile.getAbsolutePath() + " already exists");
        }

        return cachedFile;
    }

    public static void unzip(File file, String targetDirectory) throws Exception {

        System.out.println("Extracting: " + file);

        ZipFile zipFile = new ZipFile(file);
        Enumeration<?> entries = zipFile.entries();

        String stripName = file.getName();
        int i = stripName.lastIndexOf('.');
        if (i > 0) {
            stripName = stripName.substring(0, i);
        }

        while (entries.hasMoreElements()) {
            ZipEntry entry = (ZipEntry) entries.nextElement();

            String entryName = entry.getName();

            if (entryName.startsWith(stripName + "/") || entryName.startsWith(stripName + "\\")) {
                entryName = entryName.substring(stripName.length() + 1);
            }

            if (entry.isDirectory()) {
                File dir = new File(targetDirectory, entryName);
                dir.mkdirs();
                continue;
            }
            copyInputStream(zipFile.getInputStream(entry),
                    new BufferedOutputStream(new FileOutputStream(new File(targetDirectory, entryName))));
        }
        zipFile.close();
    }

    public static void copyInputStream(InputStream in, OutputStream out) throws IOException {
        byte[] buffer = new byte[1024];
        int len;
        while ((len = in.read(buffer)) >= 0)
            out.write(buffer, 0, len);

        in.close();
        out.close();
    }
}

Java URL Download downloadAndExtract(String fileURL, String targetDirectory)

Description

License

Declaration

Method Source Code

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