java对字符串进行压缩转换复原

一时失言乱红尘 2023-06-25 02:24 14阅读 0赞

import java.io.ByteArrayInputStream;
    import java.io.ByteArrayOutputStream;
    import java.io.IOException;
    import java.util.zip.GZIPInputStream;
    import java.util.zip.GZIPOutputStream;
    
    /**
     * 字符串压缩
     */
    public class ZipStrUtil {
    
      /**
       * 恢复字符串
       * @param compressedStr
       * @return
       */
      public static String gunzip(String compressedStr){
        if(compressedStr==null){
          return null;
        }
    
        ByteArrayOutputStream out= new ByteArrayOutputStream();
        ByteArrayInputStream in=null;
        GZIPInputStream ginzip=null;
        byte[] compressed=null;
        String decompressed = null;
        try {
          compressed = new sun.misc.BASE64Decoder().decodeBuffer(compressedStr);
          in=new ByteArrayInputStream(compressed);
          ginzip=new GZIPInputStream(in);
    
          byte[] buffer = new byte[1024];
          int offset = -1;
          while ((offset = ginzip.read(buffer)) != -1) {
            out.write(buffer, 0, offset);
          }
          decompressed=out.toString();
        } catch (IOException e) {
          e.printStackTrace();
        } finally {
          if (ginzip != null) {
            try {
              ginzip.close();
            } catch (IOException e) {
            }
          }
          if (in != null) {
            try {
              in.close();
            } catch (IOException e) {
            }
          }
          if (out != null) {
            try {
              out.close();
            } catch (IOException e) {
            }
          }
        }
    
        return decompressed;
      }
    
      /**
       * 压缩字符串
       * @param primStr
       * @return
       */
      public static String gzip(String primStr) {
        if (primStr == null || primStr.length() == 0) {
          return primStr;
        }
    
        ByteArrayOutputStream out = new ByteArrayOutputStream();
    
        GZIPOutputStream gzip=null;
        try {
          gzip = new GZIPOutputStream(out);
          gzip.write(primStr.getBytes());
        } catch (IOException e) {
          e.printStackTrace();
        }finally{
          if(gzip!=null){
            try {
              gzip.close();
            } catch (IOException e) {
              e.printStackTrace();
            }
          }
        }
    
    
        return new sun.misc.BASE64Encoder().encode(out.toByteArray());
      }
    }