这篇文章主要介绍了Java GZIP压缩与解压缩代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
1.GZIP压缩
public static byte[] compress(String str, String encoding) { if (str == null || str.length() == 0) { return null; } ByteArrayOutputStream out = new ByteArrayOutputStream(); GZIPOutputStream gzip; try { gzip = new GZIPOutputStream(out); gzip.write(str.getBytes(encoding)); gzip.close(); } catch ( Exception e) { e.printStackTrace(); } return out.toByteArray(); }
2.GZIP解压缩
public static byte[] uncompress(byte[] bytes) { if (bytes == null || bytes.length == 0) { return null; } ByteArrayOutputStream out = new ByteArrayOutputStream(); ByteArrayInputStream in = new ByteArrayInputStream(bytes); try { GZIPInputStream ungzip = new GZIPInputStream(in); byte[] buffer = new byte[256]; int n; while ((n = ungzip.read(buffer)) >= 0) { out.write(buffer, 0, n); } } catch (Exception e) { e.printStackTrace(); } return out.toByteArray(); }
3.工具代码集合
import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.util.zip.GZIPInputStream;import java.util.zip.GZIPOutputStream;public class GZIPUtils { public static final String GZIP_ENCODE_UTF_8 = "UTF-8"; public static final String GZIP_ENCODE_ISO_8859_1 = "ISO-8859-1"; public static byte[] compress(String str, String encoding) { if (str == null || str.length() == 0) { return null; } ByteArrayOutputStream out = new ByteArrayOutputStream(); GZIPOutputStream gzip; try { gzip = new GZIPOutputStream(out); gzip.write(str.getBytes(encoding)); gzip.close(); } catch ( Exception e) { e.printStackTrace(); } return out.toByteArray(); } public static byte[] compress(String str) throws IOException { return compress(str, GZIP_ENCODE_UTF_8); } public static byte[] uncompress(byte[] bytes) { if (bytes == null || bytes.length == 0) { return null; } ByteArrayOutputStream out = new ByteArrayOutputStream(); ByteArrayInputStream in = new ByteArrayInputStream(bytes); try { GZIPInputStream ungzip = new GZIPInputStream(in); byte[] buffer = new byte[256]; int n; while ((n = ungzip.read(buffer)) >= 0) { out.write(buffer, 0, n); } } catch (Exception e) { e.printStackTrace(); } return out.toByteArray(); } public static String uncompressToString(byte[] bytes, String encoding) { if (bytes == null || bytes.length == 0) { return null; } ByteArrayOutputStream out = new ByteArrayOutputStream(); ByteArrayInputStream in = new ByteArrayInputStream(bytes); try { GZIPInputStream ungzip = new GZIPInputStream(in); byte[] buffer = new byte[256]; int n; while ((n = ungzip.read(buffer)) >= 0) { out.write(buffer, 0, n); } return out.toString(encoding); } catch (Exception e) { e.printStackTrace(); } return null; } public static String uncompressToString(byte[] bytes) { return uncompressToString(bytes, GZIP_ENCODE_UTF_8); } public static void main(String[] args) throws IOException { String s = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"; System.out.println("字符串长度："+s.length()); System.out.println("压缩后：："+compress(s).length); System.out.println("解压后："+uncompress(compress(s)).length); System.out.println("解压字符串后：："+uncompressToString(compress(s)).length()); }}
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本文标题: Java GZIP压缩与解压缩代码实例
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