String byte[] stream File之间的相互转换

最新推荐文章于 2024-10-01 09:29:09 发布

原创最新推荐文章于 2024-10-01 09:29:09 发布 · 877 阅读

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本文介绍了一个简单的Java方法，通过URL获取图片数据，并将其保存为本地文件。该方法利用了Java的URL、InputStream和FileOutputStream类，演示了如何从网络地址下载图片并进行本地存储。

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public static InputStream stringTOInputStream(ByteString webpage)
			throws Exception {

		ByteArrayInputStream is = new ByteArrayInputStream(
				webpage.toByteArray());

		return is;

	}

	public static void inputstreamtofile(InputStream ins, File file) {
		try {
			OutputStream os = new FileOutputStream(file);
			int bytesRead = 0;
			byte[] buffer = new byte[8192];
			while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
				os.write(buffer, 0, bytesRead);
			}
			os.close();
			ins.close();
		} catch (Exception e) {
			e.printStackTrace();
			android.util.Log.d("PADATEST",
					"inputstreamtofile =" + e.getMessage());
		}
	}

	public void saveUrlImg(String url, File file) {
		ByteArrayOutputStream os = null;
		byte[] result = null;
		try {

			InputStream is = new java.net.URL(url).openStream();
			inputstreamtofile(is, file);

			is.close();
		} catch (Exception e) {
			e.printStackTrace();
			android.util.Log.d("PADATEST", "saveUrlImg =" + e.getMessage());
		}
	}

	public static File getFilePath(String filePath, String fileName) {
		File file = null;
		makeRootDirectory(filePath);
		try {
			file = new File(filePath + fileName);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return file;
	}

	public static void makeRootDirectory(String filePath) {
		android.util.Log.d("PADATEST", "filePath =" + filePath);
		File file = null;
		try {
			file = new File(filePath);
			if (!file.exists()) {
				file.mkdirs();
			}
		} catch (Exception e) {

		}
	}