java lz4压缩工具类

最新推荐文章于 2025-01-20 09:20:05 发布

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最新推荐文章于 2025-01-20 09:20:05 发布

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文章标签：压缩算法 lz4 java

本文链接：https://blog.youkuaiyun.com/hwh22/article/details/78393385

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本文介绍了一个基于LZ4算法的Java压缩工具类实现，包括文件到字节数组转换、字节数组压缩与解压缩等功能。通过使用LZ4Factory获取最快的压缩与解压缩器实例来提升效率。

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package com.beini.test.javase.compress;

import net.jpountz.lz4.*;

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

/**
 * Created by beini on 2017/10/30.
 * lz4:https://github.com/lz4/lz4-java
 */
public class Lz4Util {

    /**
     * @param srcByte 原始数据
     * @return 压缩后的数据
     */
    public static byte[] compressedByte(byte[] srcByte) {
        LZ4Factory factory = LZ4Factory.fastestInstance();
        LZ4Compressor compressor = factory.fastCompressor();
        return compressor.compress(srcByte);
    }

    /**
     * @param compressorByte 压缩后的数据
     * @param srcLength      压缩前的数据长度
     * @return
     */
    public static byte[] decompressorByte(byte[] compressorByte, int srcLength) {
        LZ4Factory factory = LZ4Factory.fastestInstance();
        LZ4FastDecompressor decompressor = factory.fastDecompressor();
        return decompressor.decompress(compressorByte, srcLength);
    }

    /**
     * @param srcByte
     * @param blockSize 一次压缩的大小 取值范围 64 字节-32M之间
     * @return
     * @throws IOException
     */
    public static byte[] lz4Compress(byte[] srcByte, int blockSize) throws IOException {
        LZ4Factory factory = LZ4Factory.fastestInstance();
        ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
        LZ4Compressor compressor = factory.fastCompressor();
        LZ4BlockOutputStream compressedOutput = new LZ4BlockOutputStream(byteOutput, blockSize, compressor);
        compressedOutput.write(srcByte);
        compressedOutput.close();
        return byteOutput.toByteArray();
    }

    /**
     * @param compressorByte
     * @param blockSize      一次压缩的大小 取值范围 64 字节-32M之间
     * @return
     * @throws IOException
     */
    public static byte[] lz4Decompress(byte[] compressorByte, int blockSize) throws IOException {
        LZ4Factory factory = LZ4Factory.fastestInstance();
        ByteArrayOutputStream baos = new ByteArrayOutputStream(blockSize);
        LZ4FastDecompressor decompresser = factory.fastDecompressor();
        LZ4BlockInputStream lzis = new LZ4BlockInputStream(new ByteArrayInputStream(compressorByte), decompresser);
        int count;
        byte[] buffer = new byte[blockSize];
        while ((count = lzis.read(buffer)) != -1) {
            baos.write(buffer, 0, count);
        }
        lzis.close();
        return baos.toByteArray();
    }

    /**
     * File  to byte[]
     *
     * @param filePath
     * @return
     * @throws IOException
     */
    public static byte[] returnFileByte(String filePath) throws IOException {
        FileInputStream fileInputStream = new FileInputStream(new File(filePath));
        FileChannel channel = fileInputStream.getChannel();
        ByteBuffer byteBuffer = ByteBuffer.allocate((int) channel.size());
        channel.read(byteBuffer);
        return byteBuffer.array();
    }

    /**
     * createFile
     *
     * @param fileByte
     * @param filePath
     */
    public static void createFile(byte[] fileByte, String filePath) {
        BufferedOutputStream bufferedOutputStream;
        FileOutputStream fileOutputStream;
        File file = new File(filePath);
        try {
            fileOutputStream = new FileOutputStream(file);
            bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
            bufferedOutputStream.write(fileByte);
            fileOutputStream.close();
            bufferedOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}