Java中如何实现GZIP压缩和解压缩的代码示例？

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本文简要介绍了Java GZIP压缩与解压缩代码实例，通过示例代码展示了非详细过程，对学习或工作具有一定的参考价值。需要的朋友可参考以下代码：

javapublic static byte[] gzipCompress(byte[] data) { try { ByteArrayOutputStream baos=new ByteArrayOutputStream(); GZIPOutputStream gzipOutputStream=new GZIPOutputStream(baos); gzipOutputStream.write(data); gzipOutputStream.close(); return baos.toByteArray(); } catch (IOException e) { e.printStackTrace(); return null; }}

public static byte[] gzipDecompress(byte[] data) { try { ByteArrayInputStream bais=new ByteArrayInputStream(data); GZIPInputStream gzipInputStream=new GZIPInputStream(bais); ByteArrayOutputStream baos=new ByteArrayOutputStream(); byte[] buffer=new byte[1024]; int len; while ((len=gzipInputStream.read(buffer)) !=-1) { baos.write(buffer, 0, len); } gzipInputStream.close(); return baos.toByteArray(); } catch (IOException e) { e.printStackTrace(); return null; }}

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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