java之gzip压缩、解压缩

code

package com.xcg.webapp.Common;

import org.apache.commons.lang3.StringUtils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GZipUtil {
    /**
     * gzip压缩
     * */
    public static String gzipCompress(String text) {
        if (StringUtils.isEmpty(text)) {
            return null;
        }
        java.io.ByteArrayOutputStream byteArrayOutputStream = new java.io.ByteArrayOutputStream();
        try (GZIPOutputStream gzipOutputStream = new GZIPOutputStream(byteArrayOutputStream)) {
            gzipOutputStream.write(text.getBytes(StandardCharsets.UTF_8));
            gzipOutputStream.flush();
            gzipOutputStream.finish();
        } catch (Exception e) {
            System.out.println(e);
            return null;
        }
        return Base64.getEncoder().encodeToString(byteArrayOutputStream.toByteArray());
    }

    /**
     * gzip解压缩
     * */
    public static String gzipUnCompress(String compressedStr) {
        if (compressedStr == null) {
            return null;
        }
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ByteArrayInputStream in = null;
        GZIPInputStream ginzip = null;
        byte[] compressed = null;
        String decompressed = null;
        try {
            byte[] encodedBytes = compressedStr.getBytes(StandardCharsets.UTF_8);
            compressed = Base64.getDecoder().decode(encodedBytes);

            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) {
                }
            }
            try {
                out.close();
            } catch (IOException e) {
            }
        }
        return decompressed;
    }
}