zip压缩解压

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.IOUtils;

/**
 * 解压压缩工具
 */
public class Gzip {

  public String unzip(String str) {
    if (str == null || str.length() == 0) {
      return str;
    }
    Base64 base64 = new Base64();
    byte[] bytes = base64.decode(str);
    String json = this.uncompress(bytes, "UTF-8");
    return json;
  }

  public String zip(String str) {
    if (str == null || str.length() == 0) {
      return str;
    }
    Base64 base64 = new Base64();
    byte[] bytes = this.compress(str, "UTF-8");
    String json = base64.encodeToString(bytes);
    return json;
  }

  private byte[] compress(String str, String encoding) {
    GZIPOutputStream gzip = null;
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    IOStreamOperator operator = new IOStreamOperator();
    try {
      gzip = new GZIPOutputStream(out);
      gzip.write(str.getBytes(encoding));
      gzip.close();
    }
    catch (IOException ex) {
      ex.printStackTrace();
    }
    finally {
      operator.close(null, gzip);
    }
    return out.toByteArray();
  }

  private String uncompress(byte[] bytes, String encoding) {
    InputStream in = null;
    GZIPInputStream gi = null;
    IOStreamOperator operator = new IOStreamOperator();
    String ret = null;
    try {
      in = new ByteArrayInputStream(bytes);
      gi = new GZIPInputStream(in);
      ret = IOUtils.toString(gi, encoding);
    }
    catch (IOException e) {
      e.printStackTrace();
    }
    finally {
      operator.close(gi, null);
    }
    return ret;
  }
}