java后台解决上传图片翻转90的问题，有demo，经过测试可用

1.需要加入 依赖

metadata-extractor.jar

依赖如下

<dependencies>
   <!-- Extracts Exif, IPTC, XMP, ICC and other metadata from image and video files(从图像和视频文件中提取EXIF、IPTC、XMP、ICC和其他元数据) -->
   <dependency>
      <groupId>com.drewnoakes</groupId>
      <artifactId>metadata-extractor</artifactId>
      <version>2.11.0</version>
   </dependency>

   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
   </dependency>

   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
   </dependency>

   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
   </dependency>
</dependencies>

2.主要看工具类，ImageUtil，因为是mvc上传图片，所以之前参数我参考别人代码 改了一下.

package com.huarui.util;

import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.drew.imaging.ImageMetadataReader;
import com.drew.imaging.ImageProcessingException;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.Tag;

public class ImageUtil {

	public static Map<String, Object> getExif(InputStream inputStream) {
		Map<String, Object> map = new HashMap<String, Object>();
		try {
			Metadata metadata = ImageMetadataReader.readMetadata(inputStream);
			map = printExif(metadata);
		} catch (ImageProcessingException e) {
			System.out.println(e.getMessage());
		} catch (IOException e) {
			System.out.println(e.getMessage());
		}
		return map;
	} 

	// 获取exif信息，将旋转角度信息拿到
	private static Map<String, Object> printExif(Metadata metadata) {
		Map<String, Object> map = new HashMap<String, Object>();
		String tagName = null;
		String desc = null;
		for (Directory directory : metadata.getDirectories()) {
			for (Tag tag : directory.getTags()) {
				tagName = tag.getTagName();
				desc = tag.getDescription();
				if (tagName.equals("Orientation")) {
					map.put("Orientation", desc);
				}
			}
		}
		return map;
	}

	public static int getAngle(Map<String, Object> map) {
		int ro = 0;
		if(map.get("Orientation")!=null) {
			String ori = map.get("Orientation").toString();
			if (ori.indexOf("90") >= 0) {
				ro = 1;
			} else if (ori.indexOf("180") >= 0) {
				ro = 2;
			} else if (ori.indexOf("270") >= 0) {
				ro = 3;
			}
		}
		return ro;
	}

	public static BufferedImage getBufferedImg(BufferedImage src,int width, int height, int ro) {
		int angle = (int) (90 * ro);
		int type = src.getColorModel().getTransparency();
		int wid = width;
		int hei = height;
		if (ro % 2 != 0) {
			int temp = width;
			width = height;
			height = temp;
		}
		Rectangle re = new Rectangle(new Dimension(width, height));
		BufferedImage BfImg = null;
		BfImg = new BufferedImage(re.width, re.height, type);
		Graphics2D g2 = BfImg.createGraphics();
		g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
		g2.rotate(Math.toRadians(angle), re.width / 2,re.height / 2);
		g2.drawImage(src, (re.width - wid) / 2, (re.height - hei) / 2, null);
		g2.dispose();
		return BfImg;
	}

	//获得图片的高
	public static int getHeight(InputStream is) {
		BufferedImage src = null;
		int height = -1;
		try {
			src = ImageIO.read(is);
			height = src.getHeight();
		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
		return height;
	}

	//获得图片的宽
	public static int getWidth(InputStream is) {
		BufferedImage src = null;
		int width = -1;
		try {
			src = ImageIO.read(is);
			width = src.getWidth();
		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
		return width;
	}

}

3.Ctroller

package com.huarui.action;

import com.huarui.util.ImageUtil;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

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

@Controller
public class UploadController {

    @RequestMapping("/upload")
    public @ResponseBody String fileUpload(MultipartFile file) throws IOException {

        File localFile = new File("e://a.jpg");
        String ex = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
        //图片翻转90
        int angle =  ImageUtil.getAngle(ImageUtil.getExif(file.getInputStream()));
        BufferedImage bf =ImageUtil.getBufferedImg(ImageIO.read(file.getInputStream()), ImageUtil.getWidth(file.getInputStream()), ImageUtil.getHeight(file.getInputStream()), angle);
        ImageIO.write(bf, ex.substring(1), localFile);
        //度问题
        return localFile.getAbsolutePath();
    }

    @RequestMapping("/")
    public String index(){
        return "test";
    }
}

参考代码->https://blog.csdn.net/sum__mer/article/details/50847584

亲测有效，附上链接->

https://github.com/youxiu326/sb_image_extractor.git