Java - 对单个图片文件执行 Zip 或 GZip 的压缩，然后返回压缩得到的字节数组

工具类：

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

public class CompressionUtils {
    
    
    
    public static class Zip {
    
    
        
        public static byte[] compress(byte[] data) throws IOException {
    
    
            ByteArrayOutputStream output = new ByteArrayOutputStream();
            ZipOutputStream zip = new ZipOutputStream(output);
            
            ZipEntry zipEntry = new ZipEntry("zip");
            zipEntry.setSize(data.length);
            
            zip.putNextEntry(zipEntry);
            
            zip.write(data);
            zip.flush();
            
            zip.closeEntry();
            zip.close();
            
            byte[] compressed = output.toByteArray();
            
            output.close();
            
            return compressed;
        }
        
        public static byte[] decompress(byte[] data) throws IOException {
    
    
            ByteArrayInputStream input = new ByteArrayInputStream(data);
            ZipInputStream zip = new ZipInputStream(input);
            
            byte[] decompressed = null;
            
            if (zip.getNextEntry() != null) {
    
    
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                byte[] buffer = new byte[1024 * 1];
                
                for (int length = zip.read(buffer); length > 0; length = zip.read(buffer))
                    out.write(buffer, 0, length);
                out.flush();
                
                decompressed = out.toByteArray();
                
                out.close();
            }
            
            zip.close();
            input.close();
            
            return decompressed;
        }
    }
    
    public static class GZip {
    
    

        public static byte[] compress(byte[] data) throws IOException {
    
    
            ByteArrayOutputStream output = new ByteArrayOutputStream();
            GZIPOutputStream gzip = new GZIPOutputStream(output);
            
            gzip.write(data);
            gzip.flush();
            gzip.close();
            
            byte[] compressed = output.toByteArray();
            
            output.close();
            
            return compressed;
        }
        
        public static byte[] decompress(byte[] data) throws IOException {
    
    
            ByteArrayInputStream input = new ByteArrayInputStream(data);
            GZIPInputStream gzip = new GZIPInputStream(input);
            
            ByteArrayOutputStream output = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024 * 1];
            for (int length = gzip.read(buffer); length > 0; length = gzip.read(buffer))
                output.write(buffer, 0, length);
            output.flush();
            
            byte[] decompressed = output.toByteArray();
            
            output.close();
            gzip.close();
            input.close();
            
            return decompressed;
        }
    }
}

Zip 测试类：

import java.io.IOException;

import com.mk.util.CompressionUtils;
import com.mk.util.ImageIOUtils;

public class ZipTests {
    
    

    public static void main(String[] args) throws IOException {
    
    
        byte[] data = ImageIOUtils.read("E:/PrtSc/1/starry-sky.jpg"); // Read from
        
        System.out.println("压缩之前的大小：" + data.length + " 字节");

        byte[] compressed = CompressionUtils.Zip.compress(data);
        
        System.out.println("压缩之后的大小：" + compressed.length + " 字节");

        byte[] decompressed = CompressionUtils.Zip.decompress(compressed);
        
        System.out.println("解压之后的大小：" + decompressed.length + " 字节");
        
        ImageIOUtils.write(decompressed, "E:/PrtSc/1/starry-sky-copy.jpg"); // Write to
    }
}

提示：用于读取图片的 ImageIOUtils 工具类

GZip 测试类：

import java.io.IOException;

import com.mk.util.CompressionUtils;
import com.mk.util.ImageIOUtils;

public class GZipTests {
    
    

    public static void main(String[] args) throws IOException {
    
    
        byte[] data = ImageIOUtils.read("E:/PrtSc/1/starry-sky.jpg"); // Read from
        
        System.out.println("压缩之前的大小：" + data.length + " 字节");

        byte[] compressed = CompressionUtils.GZip.compress(data);
        
        System.out.println("压缩之后的大小：" + compressed.length + " 字节");

        byte[] decompressed = CompressionUtils.GZip.decompress(compressed);
        
        System.out.println("解压之后的大小：" + decompressed.length + " 字节");
        
        ImageIOUtils.write(decompressed, "E:/PrtSc/1/starry-sky-copy.jpg"); // Write to
    }
}