java自动旋转矫正图片方向

java自动旋转矫正图片方向

maven引用

		
			com.drewnoakes
			metadata-extractor
			2.14.0
		
		
            org.apache.commons
            commons-lang3
            3.7
        
	

ImageUtils.java

import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.imageio.ImageIO;

import org.apache.commons.lang3.StringUtils;

import com.drew.imaging.jpeg.JpegMetadataReader;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.Tag;
import com.drew.metadata.exif.ExifInteropDirectory;

public class ImageUtils {

	/**
	 * 获取图片正确显示需要旋转的角度（顺时针）
	 *
	 * @param filePath
	 * @return
	 */
	public static int getRotateAngleForPhoto(String filePath) {
		File file = new File(filePath);
		int angle = 0;
		Metadata metadata;
		try {
			metadata = JpegMetadataReader.readMetadata(file);
			Iterable directories = metadata.getDirectories();
			metadata.getFirstDirectoryOfType(ExifInteropDirectory.class);
			for (Directory directory : directories) {
				if ("Exif IFD0".equals(directory.getName())) {
					Collection tags = directory.getTags();
					for (Tag tag : tags) {
						if ("Orientation".equals(tag.getTagName())) {
							angle = getNum(tag.getDescription());
							break;
						}
					}
					break;
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return angle;
	}

	/**
	 * 旋转照片
	 *
	 * @param fullPath
	 * @param angel
	 * @return
	 */
	public static String rotatePhonePhoto(String fullPath, int angel) {
		BufferedImage src;
		try {
			src = ImageIO.read(new File(fullPath));
			int src_width = src.getWidth(null);
			int src_height = src.getHeight(null);
			int swidth = src_width;
			int sheight = src_height;
			if (angel == 90 || angel == 270) {
				swidth = src_height;
				sheight = src_width;
			}
			Rectangle rect_des = new Rectangle(new Dimension(swidth, sheight));
			BufferedImage res = new BufferedImage(rect_des.width, rect_des.height, BufferedImage.TYPE_INT_RGB);
			Graphics2D g2 = res.createGraphics();
			g2.translate((rect_des.width - src_width) / 2, (rect_des.height - src_height) / 2);
			g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);
			g2.drawImage(src, null, null);
			ImageIO.write(res, "jpg", new File(fullPath));
		} catch (IOException e) {
			e.printStackTrace();
		}
		return fullPath;
	}

	private static int getNum(String str) {
		String regEx = "[^0-9]";
		Pattern p = Pattern.compile(regEx);
		Matcher m = p.matcher(str);
		String numStr = m.replaceAll("").trim();
		if (StringUtils.isNotBlank(numStr)) {
			return Integer.valueOf(numStr);
		} else {
			return 0;
		}
	}

	/**
	 * 处理ios照片
	 *
	 * @param filePath
	 */
	public static void processIosPhotos(String filePath) {
		// 计算旋转的角度
		int angle = getRotateAngleForPhoto(filePath);
		if (angle != 0) {
			rotatePhonePhoto(filePath, angle);
		}
	}

	public static void main(String[] args) throws Exception {
		String filePath = "C:\\Users\\admin\\Pictures\\旋转图\\家就是校，校即为家_毒霸看图";
		int angle = getRotateAngleForPhoto(filePath);
		System.out.println("旋转角度:" + angle);
		rotatePhonePhoto(filePath, angle);
		System.out.println("hao");
	}
}