Java如何实现远程文件下载到本地目录

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;

/**
 * @Author
 * @Date
 * @Version 1.0
 * <p>备注：远程文件下载到本地 方法二选一<p>
 */
public class downloadUtil {

    /**
     * 下载远程文件并保存到本地
     *
     * @param remoteFilePath-远程文件路径
     * @param localFilePath-本地文件路径（带文件名）
     */
    public static void downloadFile1(String remoteFilePath, String localFilePath) {
        URL urlfile = null;
        HttpURLConnection httpUrl = null;
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        File f = new File(localFilePath);
        try {
            urlfile = new URL(remoteFilePath);
            httpUrl = (HttpURLConnection) urlfile.openConnection();
            httpUrl.connect();
            bis = new BufferedInputStream(httpUrl.getInputStream());
            bos = new BufferedOutputStream(new FileOutputStream(f));
            int len = 2048;
            byte[] b = new byte[len];
            while ((len = bis.read(b)) != -1) {
                bos.write(b, 0, len);
            }
            bos.flush();
            bis.close();
            httpUrl.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                bis.close();
                bos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 下载远程文件并保存到本地
     *
     * @param remoteFilePath-远程文件路径
     * @param localFilePath-本地文件路径（带文件名）
     */
    public static void downloadFile2(String remoteFilePath, String localFilePath) {
        URL website = null;
        ReadableByteChannel rbc = null;
        FileOutputStream fos = null;
        try {
            website = new URL(remoteFilePath);
            rbc = Channels.newChannel(website.openStream());
            fos = new FileOutputStream(localFilePath);//本地要存储的文件地址 例如：test.txt
            fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            if(fos!=null){
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(rbc!=null){
                try {
                    rbc.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }


    /**
     * 小试牛刀
     * @param args
     */
    public static void main(String[] args) {
        /*远程文件路径*/
        String remoteFilePath1 = "https://tenfei01.cfp.cn/creative/vcg/800/new/VCG211157640278-VXD.jpg";
        String remoteFilePath2 = "https://pic.3gbizhi.com/2019/1112/20191112013312648.jpg";
        /*本地文件路径（带文件名）*/
        String localFilePath1 ="E:\\LeStoreDownload\\update\\广州塔.jpg";
        String localFilePath2 ="E:\\LeStoreDownload\\update\\大桥.jpg";
        downloadFile1(remoteFilePath1,localFilePath1);
        downloadFile2(remoteFilePath2,localFilePath2);
    }

}