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,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,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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