このJavaの例では、URL “mkyong.com”からページのコンテンツを取得し、それを “test.html”という名前のローカルファイルドライブに保存する方法を示します。

package com.mkyong;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class GetURLContent {
    public static void main(String[]args) {

        URL url;

        try {
           //get URL content
            url = new URL("/");
            URLConnection conn = url.openConnection();

           //open the stream and put it into BufferedReader
            BufferedReader br = new BufferedReader(
                               new InputStreamReader(conn.getInputStream()));

            String inputLine;

           //save to this filename
            String fileName = "/users/mkyong/test.html";
            File file = new File(fileName);

            if (!file.exists()) {
                file.createNewFile();
            }

           //use FileWriter to write file
            FileWriter fw = new FileWriter(file.getAbsoluteFile());
            BufferedWriter bw = new BufferedWriter(fw);

            while ((inputLine = br.readLine()) != null) {
                bw.write(inputLine);
            }

            bw.close();
            br.close();

            System.out.println("Done");

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}