关于zip对文本进行压缩和解压

最新推荐文章于 2023-05-24 11:05:57 发布

原创最新推荐文章于 2023-05-24 11:05:57 发布 · 490 阅读

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本文介绍了一个Java实用类，用于实现字符串的Zip压缩及解压缩功能。通过Base64编码处理压缩后的字节流，便于在网络中传输。代码详细展示了如何使用Java标准库中的ZipOutputStream和ZipInputStream来完成压缩与解压缩过程。

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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) {
    }
   }
  }