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Hutool是一个小而全的Java工具类库,通过静态方法封装,降低相关API的学习成本,提高工作效率,使Java拥有函数式语言般的优雅,让Java语言也可以“甜甜的”。

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package cn.hutool.core.compress;

import cn.hutool.core.io.IORuntimeException;
import cn.hutool.core.io.IoUtil;

import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterOutputStream;

/**
 * Deflate算法
* Deflate是同时使用了LZ77算法与哈夫曼编码(Huffman Coding)的一个无损数据压缩算法。 * * @author looly * @since 5.7.8 */ public class Deflate implements Closeable { private final InputStream source; private OutputStream target; private final boolean nowrap; /** * 创建Deflate * * @param source 源流 * @param target 目标流 * @param nowrap {@code true}表示兼容Gzip压缩 * @return this */ public static Deflate of(InputStream source, OutputStream target, boolean nowrap) { return new Deflate(source, target, nowrap); } /** * 构造 * * @param source 源流 * @param target 目标流 * @param nowrap {@code true}表示兼容Gzip压缩 */ public Deflate(InputStream source, OutputStream target, boolean nowrap) { this.source = source; this.target = target; this.nowrap = nowrap; } /** * 获取目标流 * * @return 目标流 */ public OutputStream getTarget() { return this.target; } /** * 将普通数据流压缩 * * @param level 压缩级别,0~9 * @return this */ public Deflate deflater(int level) { target= (target instanceof DeflaterOutputStream) ? (DeflaterOutputStream) target : new DeflaterOutputStream(target, new Deflater(level, nowrap)); IoUtil.copy(source, target); try { ((DeflaterOutputStream)target).finish(); } catch (IOException e) { throw new IORuntimeException(e); } return this; } /** * 将压缩流解压到target中 * * @return this */ public Deflate inflater() { target = (target instanceof InflaterOutputStream) ? (InflaterOutputStream) target : new InflaterOutputStream(target, new Inflater(nowrap)); IoUtil.copy(source, target); try { ((InflaterOutputStream)target).finish(); } catch (IOException e) { throw new IORuntimeException(e); } return this; } @Override public void close() { IoUtil.close(this.target); IoUtil.close(this.source); } }




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