Java GZIP压缩与解压缩代码实例

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());
 }
}

来源：https://www.cnblogs.com/zhuyeshen/p/12160741.html