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Gleemingknight

Mar 23rd, 2021 (edited)

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Java 2.48 KB | None | 0 0

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import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Scanner;
/**
* A simple program that finds information from a website
* of your choosing and saves it to a file of your choosing
*/
public class PaulIsDumb {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
// Ask and Receive URL input
System.out.println("Please input a URL:");
String url = scanner.nextLine();
// Detect if valid url
if(!url.startsWith("http") || !url.contains("//")) {
System.out.println("Invalid URL.");
return;
}
// Ask and Receive file name
System.out.println("Please input a file name:");
String fileName = scanner.nextLine();
// Retrieve information from the website
String retrieved;
try { retrieved = makeGETRequest(url);
} catch(IOException ex) {
System.out.println("There was an error whilst attempting to complete your request.");
return;
}
// Write to file
try { writeToFile(new File(fileName), retrieved);
} catch(IOException ex) {
System.out.println("There was an error whilst attempting to write to the file.");
return;
}
// Tell user the operation has concluded
System.out.println("Successfully written to file.");
}
/**
* Writes a string to a file
*
* @param file File to write to
* @param meta Information to write
*/
private static void writeToFile(File file, String meta) throws IOException {
FileWriter writer = new FileWriter(file);
writer.write(meta);
writer.close();
}
/**
* Makes a GET request to a specific URL
*
* @param url Website Address
* @return Response
*/
private static String makeGETRequest(String url) throws IOException {
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
con.setRequestProperty("User-Agent", "Mozilla/5.0");
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuilder response = new StringBuilder();
while ((inputLine = in.readLine()) != null) response.append(inputLine).append("\n");
in.close();
return response.toString();
}
}

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