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Download file using Java
package com.kodemate.tutorials.downloadfile;
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
public class DownloadFile {
static final String FILE_URL = "https://kodemate.com/wp-content/uploads/2018/08/kodemate.com-logo-design-header-retina-300x99.png";
public static void main(String... args) {
usingJavaIO();
usingFilesCopy();
usingJavaNIO();
}
public static void usingJavaIO() {
BufferedInputStream in;
FileOutputStream fileStream;
try {
in = new BufferedInputStream(new URL(FILE_URL).openStream());
fileStream = new FileOutputStream("./logo.png");
byte buffer[] = new byte[1024];
int bRead;
while((bRead = in.read(buffer, 0, 1024)) != -1) {
fileStream.write(buffer, 0, bRead);
}
fileStream.close();
in.close();
} catch (IOException e) {
System.out.println("Error: " + e.getMessage());
}
}
public static void usingFilesCopy() {
InputStream in = null;
try {
in = new URL(FILE_URL).openStream();
Files.copy(in, Paths.get("./logo.png"), StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e) {
e.printStackTrace();
}
}
public static void usingJavaNIO() {
try {
ReadableByteChannel readChannel = Channels.newChannel(new URL(FILE_URL).openStream());
FileOutputStream fileStream = new FileOutputStream("./logo.png");
FileChannel writeChannel = fileStream.getChannel();
writeChannel.transferFrom(readChannel, 0, Long.MAX_VALUE);
fileStream.close();
readChannel.close();
writeChannel.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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