Java根据URL下载文件到本地的2种方式(大型文件与小型文件)

public static void downloadFile(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();
                }

            }
        }
    }

public static void downloadFile1(String downloadUrl, String path){
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            URL url = new URL(downloadUrl);
            //这里没有使用 封装后的ResponseEntity 就是也是因为这里不适合一次性的拿到结果，放不下content,会造成内存溢出
            HttpURLConnection connection =(HttpURLConnection) url.openConnection();

            //使用bufferedInputStream 缓存流的方式来获取下载文件，不然大文件会出现内存溢出的情况
            inputStream = new BufferedInputStream(connection.getInputStream());
            File file = new File(path);
            if (file.exists()) {
                file.delete();
            }
            outputStream = new FileOutputStream(file);
            //这里也很关键每次读取的大小为5M 不一次性读取完
            byte[] buffer = new byte[1024 * 1024 * 5];// 5MB
            int len = 0;
            while ((len = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, len);
            }
            connection.disconnect();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            IOUtils.closeQuietly(outputStream);
            IOUtils.closeQuietly(inputStream);
        }
    }