Java URL文件下载

Question

I am trying to create a java console app which will download a file from a URL. The file is created at Runtime and I don't know the file name. When I copy and paste the URL in the browser the save file pop up comes up to save the file. Now I want to create Java code which logs on to the server (validates user I have that done) go to that URL and download the file.

Answer 1

Sergii's answer is a good start; however, if the website you want to use requires more that a simple download, consider using Apache's HttpClient .

It supports cookies, authentication, URIs as well as URLs, and file upload.

Answer 2

Simple exapmple from docs, just to put your url insted of http://www.oracle.com/ , and change System.out.println(inputLine); to write file on disk.

import java.net.*;
import java.io.*;

public class URLReader {
    public static void main(String[] args) throws Exception {

        URL oracle = new URL("http://www.oracle.com/");
        BufferedReader in = new BufferedReader(
        new InputStreamReader(oracle.openStream()));

        String inputLine;
        while ((inputLine = in.readLine()) != null)
            System.out.println(inputLine);
        in.close();
    }
}