ZipUtils压缩工具类

注意事项：
1、主要Maven依赖

	org.apache.commons
	commons-lang3
	3.9

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.*;

/**
 * @Author Dylan
 * @Date 2019/11/21
 */
public class ZipUtils {

	private static final Logger LOGGER = LoggerFactory.getLogger(ZipUtils.class);

	/**
	 * GZip压缩
	 *
	 * @param primalString
	 * @return
	 */
	public static String gZip(String primalString) {

		if (StringUtils.isBlank(primalString)) return null;

		try {
			ByteArrayOutputStream out = new ByteArrayOutputStream();

			try (GZIPOutputStream gZipStream = new GZIPOutputStream(out)) {
				gZipStream.write(primalString.getBytes());
			}

			return new sun.misc.BASE64Encoder().encode(out.toByteArray());
		} catch (Exception e) {
			LOGGER.error("GZip Failed: " + primalString);
			return null;
		}
	}

	/**
	 * GZip解压缩
	 *
	 * @param compressedString
	 * @return
	 */
	public static String unGZip(String compressedString) {

		if (StringUtils.isBlank(compressedString)) return null;

		byte[] compressed;
		try {
			compressed = new sun.misc.BASE64Decoder().decodeBuffer(compressedString);
			try (ByteArrayOutputStream out = new ByteArrayOutputStream();
				 GZIPInputStream unGZipStream = new GZIPInputStream(new ByteArrayInputStream(compressed))) {

				byte[] buffer = new byte[1024];
				int offset;
				while ((offset = unGZipStream.read(buffer)) != -1) {
					out.write(buffer, 0, offset);
				}

				return out.toString();
			}
		} catch (IOException e) {
			LOGGER.error("UnGZip Failed: " + compressedString);
			return null;
		}
	}

	/**
	 * zip压缩
	 *
	 * @param primalString
	 * @return
	 */
	public static String zip(String primalString) {

		if (StringUtils.isBlank(primalString)) return null;

		try (ByteArrayOutputStream out = new ByteArrayOutputStream();
			 ZipOutputStream zipStream = new ZipOutputStream(out)) {

			zipStream.putNextEntry(new ZipEntry("0"));
			zipStream.write(primalString.getBytes());
			zipStream.closeEntry();

			return new sun.misc.BASE64Encoder().encodeBuffer(out.toByteArray());
		} catch (IOException e) {
			LOGGER.error("Zip Failed: " + primalString);
			return null;
		}
	}

	/**
	 * zip解压缩
	 *
	 * @param compressedString
	 * @return
	 */
	public static String unZip(String compressedString) {

		if (StringUtils.isBlank(compressedString)) return null;

		byte[] compressed;
		try {
			compressed = new sun.misc.BASE64Decoder().decodeBuffer(compressedString);
			try (ByteArrayOutputStream out = new ByteArrayOutputStream();
				 ZipInputStream unZipStream = new ZipInputStream(new ByteArrayInputStream(compressed))) {

				unZipStream.getNextEntry();
				byte[] buffer = new byte[1024];
				int offset;
				while ((offset = unZipStream.read(buffer)) != -1) {
					out.write(buffer, 0, offset);
				}

				return out.toString();
			}
		} catch (IOException e) {
			LOGGER.error("UnZip Failed: " + compressedString);
			return null;
		}
	}
}