Java gzip compression and decompression code example

This article mainly introduces Java gzip compression and decompression code examples. The example code is introduced in great detail, which has certain reference value for everyone's study or work. Friends in need can refer to it

1. Gzip compression

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 decompression

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,n);
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    return out.toByteArray();
  }

3. Tool code set

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,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,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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