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());
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。