Java使用GZIP進行String字串壓縮和解壓縮
阿新 • • 發佈:2019-01-07
import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.util.zip.GZIPInputStream; import java.util.zip.GZIPOutputStream; /** * @Auther: liangbl * @Date: 2018/12/21 13:06 * @Description: */ public class GZIPUtils { /** * 使用gzip進行壓縮 */ public static String compress(String primStr) { if (primStr == null || primStr.length() == 0) { return primStr; } ByteArrayOutputStream out = new ByteArrayOutputStream(); GZIPOutputStream gzip = null; try { gzip = new GZIPOutputStream(out); gzip.write(primStr.getBytes()); } catch (IOException e) { e.printStackTrace(); } finally { if (gzip != null) { try { gzip.close(); } catch (IOException e) { e.printStackTrace(); } } } return new sun.misc.BASE64Encoder().encode(out.toByteArray()); } /** * 使用gzip進行解壓縮 */ public static String uncompress(String compressedStr) { if (compressedStr == null) { return null; } ByteArrayOutputStream out = new ByteArrayOutputStream(); ByteArrayInputStream in = null; GZIPInputStream ginzip = null; byte[] compressed = null; String decompressed = null; try { compressed = new sun.misc.BASE64Decoder().decodeBuffer(compressedStr); in = new ByteArrayInputStream(compressed); ginzip = new GZIPInputStream(in); byte[] buffer = new byte[1024]; int offset = -1; while ((offset = ginzip.read(buffer)) != -1) { out.write(buffer, 0, offset); } decompressed = out.toString(); } catch (IOException e) { e.printStackTrace(); } finally { if (ginzip != null) { try { ginzip.close(); } catch (IOException e) { } } if (in != null) { try { in.close(); } catch (IOException e) { } } try { out.close(); } catch (IOException e) { } } return decompressed; } public static void main(String[] args) { String str = "1888888888888888888888884444444444444444444444444444443333333333333333332222222222222222288888888888888884444444444444444444444444443333d888888888888888866666"; System.out.println("原字串:" + str); System.out.println("原長度:" + str.length()); String compress = GZIPUtils.compress(str); System.out.println("壓縮後字串:" + compress); System.out.println("壓縮後字串長度:" + compress.length()); String string = GZIPUtils.uncompress(compress); System.out.println("解壓縮後字串:" + string); System.out.println("解壓縮後字串:" + str); } }
結果如下圖: