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java如何压缩字节

2026-03-25 00:13:50Java

使用 `Deflater` 类压缩字节

Java 提供了 java.util.zip.Deflater 类用于压缩字节数据。以下是一个示例代码：

java如何压缩字节

import java.util.zip.Deflater;

public class ByteCompressor {
    public static byte[] compress(byte[] input) {
        Deflater deflater = new Deflater();
        deflater.setInput(input);
        deflater.finish();

        byte[] buffer = new byte[input.length];
        int compressedLength = deflater.deflate(buffer);
        byte[] output = new byte[compressedLength];
        System.arraycopy(buffer, 0, output, 0, compressedLength);
        return output;
    }
}

使用 `Inflater` 类解压缩字节

解压缩可以使用 java.util.zip.Inflater 类：

java如何压缩字节

import java.util.zip.Inflater;

public class ByteDecompressor {
    public static byte[] decompress(byte[] input) {
        Inflater inflater = new Inflater();
        inflater.setInput(input);

        byte[] buffer = new byte[1024];
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        try {
            while (!inflater.finished()) {
                int count = inflater.inflate(buffer);
                outputStream.write(buffer, 0, count);
            }
        } catch (DataFormatException e) {
            e.printStackTrace();
        }
        return outputStream.toByteArray();
    }
}

使用 `GZIPOutputStream` 和 `GZIPInputStream`

对于简单的 GZIP 格式压缩：

import java.io.*;
import java.util.zip.GZIPOutputStream;
import java.util.zip.GZIPInputStream;

public class GzipCompressor {
    public static byte[] compress(byte[] input) throws IOException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try (GZIPOutputStream gzip = new GZIPOutputStream(bos)) {
            gzip.write(input);
        }
        return bos.toByteArray();
    }

    public static byte[] decompress(byte[] input) throws IOException {
        ByteArrayInputStream bis = new ByteArrayInputStream(input);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try (GZIPInputStream gzip = new GZIPInputStream(bis)) {
            byte[] buffer = new byte[1024];
            int len;
            while ((len = gzip.read(buffer)) > 0) {
                bos.write(buffer, 0, len);
            }
        }
        return bos.toByteArray();
    }
}

使用 Apache Commons Compress 库

如果需要更高级的压缩算法（如 LZ4、Brotli 等），可以使用 Apache Commons Compress：

import org.apache.commons.compress.compressors.lz4.FramedLZ4CompressorOutputStream;
import org.apache.commons.compress.compressors.lz4.FramedLZ4CompressorInputStream;

public class LZ4Compressor {
    public static byte[] compress(byte[] input) throws IOException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try (FramedLZ4CompressorOutputStream lz4 = new FramedLZ4CompressorOutputStream(bos)) {
            lz4.write(input);
        }
        return bos.toByteArray();
    }

    public static byte[] decompress(byte[] input) throws IOException {
        ByteArrayInputStream bis = new ByteArrayInputStream(input);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try (FramedLZ4CompressorInputStream lz4 = new FramedLZ4CompressorInputStream(bis)) {
            byte[] buffer = new byte[1024];
            int len;
            while ((len = lz4.read(buffer)) > 0) {
                bos.write(buffer, 0, len);
            }
        }
        return bos.toByteArray();
    }
}