关于zip对文本进行压缩和解压



import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.util.zip.ZipEntry;

import java.util.zip.ZipInputStream;

import java.util.zip.ZipOutputStream;

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

public class ZipUtil {

 /**

  * 使用zip进行压缩

  *

  * @param str

  * @author: pzx

  *            压缩前的文本

  * @return 返回压缩后的文本

  */

 public static final String zipBase64String(String str) {

  if (str == null)

   return null;

  byte[] compressed;

  ByteArrayOutputStream out = null;

  ZipOutputStream zout = null;

  String compressedStr = null;

  try {

   out = new ByteArrayOutputStream();

   zout = new ZipOutputStream(out);

   zout.putNextEntry(new ZipEntry("zip"));

   zout.write(str.getBytes("utf-8"));

   zout.closeEntry();

   compressed = out.toByteArray();

   compressedStr = Base64.encodeBase64String(compressed);

  } catch (IOException e) {

   e.printStackTrace();

   compressed = null;

  } finally {

   if (zout != null) {

    try {

     zout.close();

    } catch (IOException e) {

    }

   }

   if (out != null) {

    try {

     out.close();

    } catch (IOException e) {

    }

   }

  }

  return compressedStr;

 }

 /**

  * 使用zip进行解压缩

  *

  * @param compressed

  *            Base64转码的压缩文本

  * @return 解压后的字符串

  */

 public static String unzipBase642String(String base64CompressedStr) {

  if (base64CompressedStr == null) {

   return null;

  }

  ByteArrayOutputStream out = new ByteArrayOutputStream();

  ByteArrayInputStream in = null;

  ZipInputStream ginzip = null;

  String decompressed = null;

  try {

   byte[] compressed = Base64.decodeBase64(base64CompressedStr);

   in = new ByteArrayInputStream(compressed);

   ginzip = new ZipInputStream(in);

   ginzip.getNextEntry();

   byte[] buffer = new byte[1024];

   int offset = -1;

   while ((offset = ginzip.read(buffer)) != -1) {

    out.write(buffer, 0, offset);

   }

   decompressed = out.toString("utf-8");

  } catch (IOException e) {

   e.printStackTrace();

  } finally {

   if (out != null) {

    try {

     out.close();

    } catch (IOException e) {

    }

   }

   if (ginzip != null) {

    try {

     ginzip.close();

    } catch (IOException e) {

    }

   }

   if (in != null) {

    try {

     in.close();

    } catch (IOException e) {

    }

   }

  }

  return decompressed;

 }

}