base64字符串转化成图片

给定坐标点，以及宽高范围，然后截取图片

图片逆时针旋转90度

import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;public class ImgUtil {private static final Logger log = LoggerFactory.getLogger(ImgUtil.class);/*** 根据指定坐标 截取控件元素周边图片* @param inputPath 输入图片路径* @param x         截取位置X坐标* @param y         截取位置Y坐标* @param interceptWidth 以x坐标为基准，截取的宽度* @param interceptHeight 以y坐标为基准，截取的高度* @param outputPath 输出新图片路径*/public static void interceptImg(String inputPath, int x, int y, int interceptWidth, int interceptHeight, String outputPath) {try(OutputStream out = new FileOutputStream(outputPath);   ) {File sourcePic = new File(inputPath);BufferedImage pic = ImageIO.read(sourcePic);//参数依次为，截取起点的x坐标，y坐标，截取宽度，截取高度BufferedImage pic2 = pic.getSubimage(x, y, interceptWidth, interceptHeight);//将截取的子图另行存储Image _img = pic2.getScaledInstance(interceptWidth, interceptHeight, Image.SCALE_AREA_AVERAGING);BufferedImage image = new BufferedImage(interceptWidth, interceptHeight, BufferedImage.TYPE_INT_RGB);Graphics2D graphics = image.createGraphics();graphics.drawImage(_img, 0, 0, null);graphics.dispose();ImageIO.write(pic2, "png", out);out.flush();} catch (IOException e) {log.error("图片剪裁出错", e);throw new RuntimeException(e);}}// base64字符串转化成图片public static boolean base64ToImg(String imgBase64 ,String imgFilePath) {if(imgBase64 == null || StringUtils.isEmpty(imgBase64)){return false;}int index = imgBase64.indexOf(";base64,");if (index > -1) {imgBase64 = imgBase64.substring(index + 8);}if(imgFilePath == null || StringUtils.isEmpty(imgFilePath)){return false;}File dirFile = new File(imgFilePath);if(!dirFile.getParentFile().exists()&& !dirFile.getParentFile().mkdirs()){log.warn("创建文件目录失败, 路径: {}", imgFilePath);return false;}// Base64解码byte[] b = Base64.decodeBase64(imgBase64);try(OutputStream out = new FileOutputStream(imgFilePath);){out.write(b);out.flush();return true;} catch (Exception e) {log.warn("保存图片失败", e);}return false;}/*** 图片逆时针旋转90度* @param inputBytes 源文件字节数组* @param targetPath 输出路径*/public static void leftRotate90(byte[] inputBytes, String targetPath) {// 图片类型try(InputStream inputStream = new ByteArrayInputStream(inputBytes);BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);) {BufferedImage originalImg = ImageIO.read(bufferedInputStream);leftRotate90(originalImg, targetPath);} catch (IOException e) {log.error("图片逆时针旋转90度失败", e);throw new RuntimeException("图片逆时针旋转90度失败");}}/*** 图片逆时针旋转90度* @param sourcePath 源文件路径* @param targetPath 输出文件路径*/public static void leftRotate90(String sourcePath, String targetPath) {try {BufferedImage originalImg = ImageIO.read(new File(sourcePath));leftRotate90(originalImg, targetPath);} catch (IOException e) {log.error("图片逆时针旋转90度失败", e);throw new RuntimeException("图片逆时针旋转90度失败");}}/*** 图片逆时针旋转90度* @param originalImg 源文件图形对象* @param targetPath 输出文件路径*/public static void leftRotate90(BufferedImage originalImg, String targetPath) {try {int width = originalImg.getWidth();int height = originalImg.getHeight();BufferedImage outBufferedImg = new BufferedImage(height, width, originalImg.getType());for (int i = 0; i < width; i++) {for (int j = 0; j < height; j++) {outBufferedImg.setRGB(j, width - i - 1, originalImg.getRGB(i, j));}}ImageIO.write(outBufferedImg, "png", new File(targetPath));} catch (IOException e) {log.error("图片逆时针旋转90度失败", e);throw new RuntimeException("图片逆时针旋转90度失败");}}
}

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