Springboot + thumbnailator 实现图片压缩上传

1、添加Maven

<!-- https://mvnrepository.com/artifact/net.coobird/thumbnailator -->
        <dependency>
            <groupId>net.coobird</groupId>
            <artifactId>thumbnailator</artifactId>
            <version>0.4.8</version>
        </dependency>

2、代码实现：

package com.image.service;

import net.coobird.thumbnailator.Thumbnails;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

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

/**
 * ClassName: ImageService
 *
 * @Author: Mr_Wang
 * @Date: 2020/2/18 17:39
 * @Description: TODO
 */
@Service
public class ImageService {

    String storePath = "D:\\图片压缩测试\\";

    /**
     * 指定大小进行缩放
     * 若图片横比200小，高比300小，不变
     * 若图片横比200小，高比300大，高缩小到300，图片比例不变
     * 若图片横比200大，高比300小，横缩小到200，图片比例不变
     * 若图片横比200大，高比300大，图片按比例缩小，横为200或高为300
     */
    public void upload1(MultipartFile file) throws Exception {
        File dest = new File(storePath+ file.getOriginalFilename() + "_200x300.jpg");
        Thumbnails.of(file.getInputStream())
                .size(200, 300)
                .toFile(dest);
    }

    /**
     * 按照比例进行缩放
     * scale(比例)
     * */
    public void upload2(MultipartFile file) throws Exception {
        File dest = new File(storePath+ file.getOriginalFilename() + "_25%.jpg");
        Thumbnails.of(file.getInputStream())
                .scale(0.25f)
                .toFile(dest);
    }

    /**
     *  不按照比例，指定大小进行缩放
     *  keepAspectRatio(false) 默认是按照比例缩放的
     * */
    public void upload3(MultipartFile file) throws Exception {
        File dest = new File(storePath+ file.getOriginalFilename() + "_200x200.jpg");
        Thumbnails.of(file.getInputStream())
                .size(200, 200)
                .keepAspectRatio(false)
                .toFile(dest);
    }

    /**
     *  输出图片到流对象
     *
     * */
    public void upload4(MultipartFile file) throws Exception {
        OutputStream os = new FileOutputStream(storePath+ file.getOriginalFilename() + "_OutputStream.png");
        Thumbnails.of(file.getInputStream())
                .size(1280, 1024)
                .toOutputStream(os);
    }

    /**
     *  输出图片到BufferedImage
     * */
    public void upload5(MultipartFile file) throws Exception {
        File dest = new File(storePath+ file.getOriginalFilename() + "_BufferedImage.jpg");
        BufferedImage thumbnail = Thumbnails.of(file.getInputStream())
                .size(1280, 1024)
                .asBufferedImage();
        ImageIO.write(thumbnail, "jpg", dest);
    }
}

来源：CSDN

作者：qq_33544486

链接：https://blog.csdn.net/qq_33544486/article/details/104378876