使用gzip进行压缩、解压

package javabase;

import lombok.extern.slf4j.Slf4j;

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

/**
 * Created by chenan on 2020/7/11.
 */

@Slf4j
public class GZIPUtils {
    /**
     * 使用gzip进行压缩
     */
    public static String compress(String primStr) {
        if (primStr == null || primStr.length() == 0) {
            return primStr;
        }
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        GZIPOutputStream gzip = null;
        String outString = null;
        try {
            gzip = new GZIPOutputStream(out);
            gzip.write(primStr.getBytes());
        } catch (IOException e) {
            log.error("gzip压缩失败：", e);
        } finally {
            if (gzip != null) {
                try {
                    gzip.close();
                } catch (IOException e) {
                    log.error("gzip压缩失败：", e);
                }
            }
        }
//        String outString = new sun.misc.BASE64Encoder().encode(out.toByteArray());
        try {
            outString = out.toString("ISO-8859-1");
        } catch (Exception e) {
            log.error("压缩转化失败");
            outString = primStr;
        }
        return outString;
    }

    /**
     * 使用gzip进行解压缩
     */
    public static String uncompress(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);
            compressed = compressedStr.getBytes("ISO-8859-1");
            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 (ZipException e){
            log.error("转换格式异常，转化数据为"+compressedStr);
            decompressed = compressedStr;
        } catch (IOException e) {
            log.error("gzip解压失败：", e);
            decompressed = compressedStr;
        } finally {
            if (ginzip != null) {
                try {
                    ginzip.close();
                } catch (IOException e) {
                    log.error("gzip解压失败：", e);
                    decompressed = compressedStr;
                }
            }
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    log.error("gzip解压失败：", e);
                    decompressed = compressedStr;
                }
            }
            try {
                out.close();
            } catch (IOException e) {
                log.error("gzip解压失败：", e);
                decompressed = compressedStr;
            }
        }
        return decompressed;
    }

}