分享一个上传图片，图片压缩Unsupported Image Type解决方案

今天药忘吃喽~ 2022-07-15 12:12 217阅读 0赞

文件上传是一个最基本的功能，往往我们需要对图片进行压缩，来加快移动端的加载速度。

SprimgMVC图片上传可以参考[SpringMVC传值][SpringMVC]

从这里开始

System.out.println("文件大小: " + file.getSize());
                System.out.println("文件类型: " + file.getContentType());
                System.out.println("表单名称: " + file.getName());
                System.out.println("文件原名: " + file.getOriginalFilename());
                if (!file.getContentType().contains("image")) {
                    return BaseReturn.response(ErrorCode.FAILURE, "不支持的图片类型：" + file.getContentType());
                }
                String image = ImageService.saveImage(request, file, uploadPath);

相关依赖

<dependency>
            <groupId>net.coobird</groupId>
            <artifactId>thumbnailator</artifactId>
            <version>0.4.8</version>
        </dependency>
        
        <dependency>
            <groupId>com.twelvemonkeys.imageio</groupId>
            <artifactId>imageio-jpeg</artifactId>
            <version>3.3</version>
        </dependency>
        <dependency>
            <groupId>com.twelvemonkeys.imageio</groupId>
            <artifactId>imageio-tiff</artifactId>
            <version>3.3</version>
        </dependency>

ImageService

package com.jrbac.service;
    
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    
    import javax.imageio.ImageIO;
    import javax.imageio.stream.ImageOutputStream;
    import javax.servlet.http.HttpServletRequest;
    
    import org.apache.commons.io.FileUtils;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.web.multipart.MultipartFile;
    
    import com.jrbac.util.UUIDGenerator;
    
    import net.coobird.thumbnailator.Thumbnails;
    
    public class ImageService {
        private static final Logger logger = LoggerFactory.getLogger(ImageService.class);
    
        /** * @param request * @param file * @param uploadPath * 形如这样的/assets/upload/image/ * @return /assets/upload/image/abc.jpg * @throws IOException */
        public static String saveImage(HttpServletRequest request, MultipartFile file, String uploadPath) {
            // 如果用的是Tomcat服务器，则文件会上传到\\%TOMCAT_HOME%\\webapps\\YourWebProject\\uploadPath\\文件夹中
            // String fileName = file.getOriginalFilename();
            // String fileExt[] = fileName.split("\\.");
            String ext = file.getContentType().split("\\/")[1];
            String newFileName = UUIDGenerator.getUUID() + "." + ext;
            String realPath = request.getSession().getServletContext().getRealPath(uploadPath);
            String filePathAndName = null;
            if (realPath.endsWith(File.separator)) {
                filePathAndName = realPath + newFileName;
            } else {
                filePathAndName = realPath + File.separator + newFileName;
            }
            logger.info("-----上传的文件:{}-----", filePathAndName);
            try {
                // 先把文件保存到本地
                FileUtils.copyInputStreamToFile(file.getInputStream(), new File(realPath, newFileName));
            } catch (IOException e1) {
                logger.error("-----文件保存到本地发生异常:{}-----", e1.getMessage());
            }
            int big = 2 * 1024 * 1024; // 2M以上就进行0.6压缩
            if (file.getSize() > big) {
                thumbnail(filePathAndName, 0.6f);
            } else {
                thumbnail(filePathAndName, 0.8f);
            }
            return uploadPath + newFileName;
        }
    
        private static void thumbnail(String filePathAndName, double size) {
            try {
                Thumbnails.of(filePathAndName).scale(size).toFile(filePathAndName);
            } catch (IOException e) {
                logger.error("-----读取图片发生异常:{}-----", e.getMessage());
                logger.info("-----尝试cmyk转化-----");
                File cmykJPEGFile = new File(filePathAndName);
                try {
                    BufferedImage image = ImageIO.read(cmykJPEGFile);
                    ImageOutputStream output = ImageIO.createImageOutputStream(cmykJPEGFile);
                    if (!ImageIO.write(image, "jpg", output)) {
                        logger.info("-----cmyk转化异常:{}-----");
                    }
                    Thumbnails.of(image).scale(0.4f).toFile(filePathAndName);
                    logger.info("-----cmyk转化成功-----");
                } catch (IOException e1) {
                    logger.info("-----cmyk转化异常:{}-----", e1.getMessage());
                }
            }
        }
    }

这里有一点需要解释一下

FileUtils.copyInputStreamToFile(file.getInputStream(), new File(realPath, newFileName));

会将图片保存到本地，

这一步没问题

问题会发生在

Thumbnails.of(filePathAndName).scale(size).toFile(filePathAndName);

大部分情况下是不会出问题的，如果

> P过的图片保存为jpg格式时，默认的模式是CMYK模式

就会报如下错误

javax.imageio.IIOException: Unsupported Image Type

这里采用[https://github.com/haraldk/TwelveMonkeys][https_github.com_haraldk_TwelveMonkeys]工具解决

# 参考文献 #

> [SpringMVC传值][SpringMVC]
> 
> [imageIO异常：Unsupported Image Type, 不支持图像类型][imageIO_Unsupported Image Type_]
> 
> [java下cmyk图片读取和转换rgb][java_cmyk_rgb]
> 
> [https://github.com/haraldk/TwelveMonkeys][https_github.com_haraldk_TwelveMonkeys]

[SpringMVC]: http://blog.csdn.net/frankcheng5143/article/details/50725203
[https_github.com_haraldk_TwelveMonkeys]: https://github.com/haraldk/TwelveMonkeys
[imageIO_Unsupported Image Type_]: http://blog.sina.com.cn/s/blog_600ff075010153wn.html
[java_cmyk_rgb]: http://blog.csdn.net/ybn187/article/details/52185269