复用代码系列：6种字符串解压缩工具类

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1、字符串解压缩（gzip方式）代码如下：

package com.compress;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;import org.apache.commons.io.IOUtils;/*** gzip解压缩工具类* @author suncht**/
public abstract class GZIPUtils  {public static byte[] compress(String str, Charset encoding) {if (str == null || str.length() == 0) {return null;}ByteArrayOutputStream out = new ByteArrayOutputStream();GZIPOutputStream gzip = null;try {gzip = new GZIPOutputStream(out);gzip.write(str.getBytes(encoding));gzip.close();} catch ( Exception e) {e.printStackTrace();} finally {IOUtils.closeQuietly(gzip);}return out.toByteArray();}public static byte[] compress(String str) throws IOException {  return compress(str, StandardCharsets.UTF_8);  }public static byte[] uncompress(byte[] bytes) {if (bytes == null || bytes.length == 0) {return null;}ByteArrayOutputStream out = new ByteArrayOutputStream();ByteArrayInputStream in = new ByteArrayInputStream(bytes);GZIPInputStream ungzip = null;try {ungzip = new GZIPInputStream(in);byte[] buffer = new byte[256];int n;while ((n = ungzip.read(buffer)) >= 0) {out.write(buffer, 0, n);}} catch (Exception e) {e.printStackTrace();} finally {IOUtils.closeQuietly(ungzip);IOUtils.closeQuietly(in);IOUtils.closeQuietly(out);}return out.toByteArray();}public static String uncompressToString(byte[] bytes, Charset encoding) {  if (bytes == null || bytes.length == 0) {  return null;  }  ByteArrayOutputStream out = new ByteArrayOutputStream();  ByteArrayInputStream in = new ByteArrayInputStream(bytes); GZIPInputStream ungzip = null;try {ungzip = new GZIPInputStream(in);  byte[] buffer = new byte[256];  int n;  while ((n = ungzip.read(buffer)) >= 0) {  out.write(buffer, 0, n);  }  return out.toString(encoding.name());} catch (Exception e) {e.printStackTrace();} finally {IOUtils.closeQuietly(ungzip);IOUtils.closeQuietly(in);IOUtils.closeQuietly(out);}return null;}public static String uncompressToString(byte[] bytes) {  return uncompressToString(bytes, StandardCharsets.UTF_8);  } public static void main(String[] args) throws IOException {String s = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";System.out.println("字符串长度："+s.length());System.out.println("压缩后：："+compress(s).length);System.out.println("解压后："+uncompress(compress(s)).length);System.out.println("解压字符串后：："+uncompressToString(compress(s)).length());}
}

2、字符串解压缩（snappy方式），代码如下：

package com.compress;import java.io.IOException;
import java.nio.charset.StandardCharsets;import org.xerial.snappy.Snappy;/*** 字符串解压缩（Snappy）* @author suncht**/
public class SnappyUtils {public static byte[] compressHtml(String str) {try {return Snappy.compress(str.getBytes(StandardCharsets.UTF_8));} catch (IOException e) {e.printStackTrace();}return null;}public static String decompressHtml(byte[] bytes) {try {return new String(Snappy.uncompress(bytes), StandardCharsets.UTF_8);} catch (IOException e) {e.printStackTrace();}return null;}public static void main(String[] args) {String s = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasdfasdfaaaaaaaaa12121sdgfas";System.out.println("字符串长度：" + s.length());System.out.println("压缩后：：" + compressHtml(s).length);System.out.println("解压后：" + decompressHtml(compressHtml(s)).length());}
}

需要Snappy依赖：

<dependency><groupId>org.xerial.snappy</groupId><artifactId>snappy-java</artifactId><version>1.1.7.1</version></dependency>

3、字符串解压缩（lz4方式），代码如下：

package com.compress;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;import net.jpountz.lz4.LZ4BlockInputStream;
import net.jpountz.lz4.LZ4BlockOutputStream;
import net.jpountz.lz4.LZ4Compressor;
import net.jpountz.lz4.LZ4Factory;
import net.jpountz.lz4.LZ4FastDecompressor;public class Lz4Utils {public static byte[] compress(byte srcBytes[]) throws IOException {LZ4Factory factory = LZ4Factory.fastestInstance();ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();LZ4Compressor compressor = factory.fastCompressor();LZ4BlockOutputStream compressedOutput = new LZ4BlockOutputStream(byteOutput, 2048, compressor);compressedOutput.write(srcBytes);compressedOutput.close();return byteOutput.toByteArray();}public static byte[] uncompress(byte[] bytes) throws IOException {LZ4Factory factory = LZ4Factory.fastestInstance();ByteArrayOutputStream baos = new ByteArrayOutputStream();LZ4FastDecompressor decompresser = factory.fastDecompressor();LZ4BlockInputStream lzis = new LZ4BlockInputStream(new ByteArrayInputStream(bytes), decompresser);int count;byte[] buffer = new byte[2048];while ((count = lzis.read(buffer)) != -1) {baos.write(buffer, 0, count);}lzis.close();return baos.toByteArray();}public static String uncompressToString(byte[] data) throws IOException {return new String(uncompress(data), StandardCharsets.UTF_8);}public static void main(String[] args) throws IOException {String s = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasdfasdfaaaaaaaaa12121sdgfas";System.out.println("字符串长度：" + s.length());byte[] data = compress(s.getBytes(StandardCharsets.UTF_8));System.out.println("压缩后：：" + data.length);System.out.println("解压后：" + uncompress(data).length);System.out.println("解压后字符串：" + uncompressToString(data));}
}

需要LZ4的依赖：

<dependency><groupId>net.jpountz.lz4</groupId><artifactId>lz4</artifactId><version>1.3.0</version></dependency>

4、字符串解压缩（Bzip2方式），代码如下：

package com.compress;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream;public class Bzip2Utils {public static byte[] compress(byte srcBytes[]) throws IOException {ByteArrayOutputStream out = new ByteArrayOutputStream();BZip2CompressorOutputStream bcos = new BZip2CompressorOutputStream(out);bcos.write(srcBytes);bcos.close();return out.toByteArray();}public static byte[] uncompress(byte[] bytes) {ByteArrayOutputStream out = new ByteArrayOutputStream();ByteArrayInputStream in = new ByteArrayInputStream(bytes);try {BZip2CompressorInputStream ungzip = new BZip2CompressorInputStream(in);byte[] buffer = new byte[2048];int n;while ((n = ungzip.read(buffer)) >= 0) {out.write(buffer, 0, n);}} catch (IOException e) {e.printStackTrace();}return out.toByteArray();}public static String uncompressToString(byte[] data) throws IOException {return new String(uncompress(data), StandardCharsets.UTF_8);}public static void main(String[] args) throws IOException {String s = "AAAAAAAAAAAAAAAAAA";System.out.println("字符串长度：" + s.length());byte[] data = compress(s.getBytes(StandardCharsets.UTF_8));System.out.println("压缩后：：" + data.length);System.out.println("解压后：" + uncompress(compress(s.getBytes(StandardCharsets.UTF_8))).length);System.out.println("解压后字符串：" + uncompressToString(data));}
}

需要commons-compress依赖：

<dependency><groupId>org.apache.commons</groupId><artifactId>commons-compress</artifactId><version>1.12</version></dependency>

5、字符串解压缩（Deflater/Inflater方式），代码如下：

package com.compress;import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;public class DeflaterUtils {public static byte[] compress(byte input[]) {ByteArrayOutputStream bos = new ByteArrayOutputStream();Deflater compressor = new Deflater(1);try {compressor.setInput(input);compressor.finish();final byte[] buf = new byte[2048];while (!compressor.finished()) {int count = compressor.deflate(buf);bos.write(buf, 0, count);}} finally {compressor.end();}return bos.toByteArray();}public static byte[] uncompress(byte[] input) throws DataFormatException {ByteArrayOutputStream bos = new ByteArrayOutputStream();Inflater decompressor = new Inflater();try {decompressor.setInput(input);final byte[] buf = new byte[2048];while (!decompressor.finished()) {int count = decompressor.inflate(buf);bos.write(buf, 0, count);}} finally {decompressor.end();}return bos.toByteArray();}public static String uncompressToString(byte[] input) throws DataFormatException {return new String(uncompress(input), StandardCharsets.UTF_8);}public static void main(String[] args) throws DataFormatException {String s = "AAAAAAAAAAAAAAAAAA";System.out.println("字符串长度：" + s.length());byte[] data = compress(s.getBytes(StandardCharsets.UTF_8));System.out.println("压缩后：：" + data.length);System.out.println("解压后：" + uncompress(compress(s.getBytes(StandardCharsets.UTF_8))).length);System.out.println("解压后字符串：" + uncompressToString(data));}
}

5、字符串解压缩（LZO方式），代码如下：

package com.compress;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;import org.anarres.lzo.LzoAlgorithm;
import org.anarres.lzo.LzoCompressor;
import org.anarres.lzo.LzoDecompressor;
import org.anarres.lzo.LzoInputStream;
import org.anarres.lzo.LzoLibrary;
import org.anarres.lzo.LzoOutputStream;public class LzoUtils {public static byte[] compress(byte srcBytes[]) throws IOException {LzoCompressor compressor = LzoLibrary.getInstance().newCompressor(LzoAlgorithm.LZO1X, null);ByteArrayOutputStream os = new ByteArrayOutputStream();LzoOutputStream cs = new LzoOutputStream(os, compressor);cs.write(srcBytes);cs.close();return os.toByteArray();}public static byte[] uncompress(byte[] bytes) throws IOException {LzoDecompressor decompressor = LzoLibrary.getInstance().newDecompressor(LzoAlgorithm.LZO1X, null);ByteArrayOutputStream baos = new ByteArrayOutputStream();ByteArrayInputStream is = new ByteArrayInputStream(bytes);LzoInputStream us = new LzoInputStream(is, decompressor);int count;byte[] buffer = new byte[2048];while ((count = us.read(buffer)) != -1) {baos.write(buffer, 0, count);}return baos.toByteArray();}public static String uncompressToString(byte[] data) throws IOException {return new String(uncompress(data), StandardCharsets.UTF_8);}public static void main(String[] args) throws IOException {String s = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasdfasdfaaaaaaaaa12121sdgfas";System.out.println("字符串长度：" + s.length());byte[] data = compress(s.getBytes(StandardCharsets.UTF_8));System.out.println("压缩后：：" + data.length);System.out.println("解压后：" + uncompress(data).length);}
}

需要LZO依赖：

<dependency><groupId>org.anarres.lzo</groupId><artifactId>lzo-core</artifactId><version>1.0.5</version></dependency>

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