java下载文件的方式
Java 提供了多种下载文件的方法。以下是几种常用的方式：
1. 使用 URL.openStream()
URL url = new URL("https://example.com/file.txt");URLConnection connection = url.openConnection();InputStream inputStream = connection.getInputStream();FileOutputStream fileOutputStream = new FileOutputStream("file.txt");byte[] buffer = new byte[1024];int len;while ((len = inputStream.read(buffer)) > 0) { fileOutputStream.write(buffer, 0, len);}2. 使用 HttpClient
HttpClient client = HttpClientBuilder.create().build();HttpGet request = new HttpGet("https://example.com/file.txt");HttpResponse response = client.execute(request);HttpEntity entity = response.getEntity();InputStream inputStream = entity.getContent();FileOutputStream fileOutputStream = new FileOutputStream("file.txt");byte[] buffer = new byte[1024];int len;while ((len = inputStream.read(buffer)) > 0) { fileOutputStream.write(buffer, 0, len);}3. 使用 URLConnection
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URL url = new URL("https://example.com/file.txt");URLConnection connection = url.openConnection();connection.setDoInput(true);connection.connect();InputStream inputStream = connection.getInputStream();FileOutputStream fileOutputStream = new FileOutputStream("file.txt");byte[] buffer = new byte[1024];int len;while ((len = inputStream.read(buffer)) > 0) { fileOutputStream.write(buffer, 0, len);}4. 使用 Java NIO
Path path = Paths.get("file.txt");FileChannel fileChannel = FileChannel.open(path, StandardOpenOption.WRITE);SocketChannel socketChannel = SocketChannel.open();socketChannel.connect(new InetSocketAddress("example.com", 80));ByteBuffer buffer = ByteBuffer.allocate(1024);while ((len = socketChannel.read(buffer)) > 0) { fileChannel.write(buffer, 0, len);}以上就是Java如何实现下载文件的几种方式的详细内容，更多请关注创想鸟其它相关文章！
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