欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

Java GZIP压缩的使用

程序员文章站 2024-03-13 23:30:46
...

为了减小服务器负担,传递字符串内容通常要进行压缩,同时也能增强传输的速度,在java中GZIP压缩基本实现代码如下:

 

	/**
	 * 将压缩字符串解压为字符串
	 * @param file 压缩文件
	 * @return 解压为字符串
	 * @throws Exception
	 */
	public static String deCompressString(File file) throws Exception{
		FileInputStream fis = new FileInputStream(file);
		ByteArrayOutputStream byteOut2 = new ByteArrayOutputStream();
		decompress(fis, byteOut2);
		byte[] bs = byteOut2.toByteArray();
		return new String(bs,"utf-8");
	}
	/**
	 * 将字符串压缩到一个file中
	 * @param str 字符串
	 * @param file 压缩到的file
	 * @throws Exception
	 */
	public static void compressString(String str,File file) throws Exception{
		FileOutputStream fos = new FileOutputStream(file);
		ByteArrayInputStream byteIn = new ByteArrayInputStream(str.getBytes("utf-8"));
		compress(byteIn, fos);
	}
	/**
	 * GZIP数据压缩
	 * @param is
	 * @param os
	 * @throws Exception
	 */
	public static void compress(InputStream is, OutputStream os) throws Exception {
		GZIPOutputStream gos = new GZIPOutputStream(os);
		int count;
		byte data[] = new byte[BUFFER];
		while ((count = is.read(data, 0, BUFFER)) != -1) {
			gos.write(data, 0, count);
		}
		gos.finish();
		gos.flush();
		gos.close();
	}
	/**
	 * GZIP数据解压缩
	 * @param is
	 * @param os
	 * @throws Exception
	 */
	public static void decompress(InputStream is, OutputStream os) throws Exception {
		GZIPInputStream gis = new GZIPInputStream(is);
		int count;
		byte data[] = new byte[BUFFER];
		while ((count = gis.read(data, 0, BUFFER)) != -1) {
			os.write(data, 0, count);
		}
		gis.close();
	}