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java如何压缩照片

2026-03-24 15:04:10Java

Java 压缩照片的方法

使用 Java 内置的 ImageIO 和 BufferedImage

通过 ImageIO 读取图片，使用 BufferedImage 调整尺寸和质量，再重新写入文件。

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class ImageCompressor {
    public static void compressImage(String inputPath, String outputPath, float quality) throws IOException {
        File inputFile = new File(inputPath);
        BufferedImage inputImage = ImageIO.read(inputFile);

        int scaledWidth = (int) (inputImage.getWidth() * 0.5);
        int scaledHeight = (int) (inputImage.getHeight() * 0.5);

        BufferedImage outputImage = new BufferedImage(scaledWidth, scaledHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = outputImage.createGraphics();
        g2d.drawImage(inputImage, 0, 0, scaledWidth, scaledHeight, null);
        g2d.dispose();

        ImageIO.write(outputImage, "jpg", new File(outputPath));
    }
}

使用第三方库 Thumbnailator

Thumbnailator 是一个简化图片处理的 Java 库，支持缩放和质量调整。

import net.coobird.thumbnailator.Thumbnails;

public class ThumbnailatorExample {
    public static void compressImage(String inputPath, String outputPath) throws IOException {
        Thumbnails.of(inputPath)
            .scale(0.5) // 缩放比例
            .outputQuality(0.8) // 输出质量（0.0-1.0）
            .toFile(outputPath);
    }
}

使用 Java 高级图像处理库 imgscalr

imgscalr 提供更简单的 API 进行图片缩放和压缩。

import org.imgscalr.Scalr;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class ImgscalrExample {
    public static void compressImage(String inputPath, String outputPath) throws IOException {
        BufferedImage originalImage = ImageIO.read(new File(inputPath));
        BufferedImage scaledImage = Scalr.resize(originalImage, Scalr.Method.QUALITY, Scalr.Mode.AUTOMATIC, 800, 600);
        ImageIO.write(scaledImage, "jpg", new File(outputPath));
    }
}

使用 Java 的 JPEG 编码参数调整质量

通过 ImageWriteParam 设置 JPEG 压缩质量。

java如何压缩照片

import javax.imageio.*;
import javax.imageio.stream.*;
import java.awt.image.*;
import java.io.*;
import java.util.Iterator;

public class JPEGQualityExample {
    public static void compressImage(String inputPath, String outputPath, float quality) throws IOException {
        BufferedImage image = ImageIO.read(new File(inputPath));
        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
        ImageWriter writer = writers.next();

        ImageWriteParam param = writer.getDefaultWriteParam();
        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        param.setCompressionQuality(quality);

        FileOutputStream out = new FileOutputStream(outputPath);
        ImageOutputStream ios = ImageIO.createImageOutputStream(out);
        writer.setOutput(ios);
        writer.write(null, new IIOImage(image, null, null), param);

        ios.close();
        out.close();
        writer.dispose();
    }
}