Java操作图片大全（持续更新）

原创

秃了也弱了 2024-05-28 20:09:33 ©著作权

文章标签 java 开发语言 Image 二维码 文章分类 Html/CSS 前端开发

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文章目录

一、Hutool工具包

1、图片缩放、裁剪、格式转换、添加水印、旋转、压缩等
2、生成图形验证码

二、二维码处理

1、使用google.zxing

三、图片生成Base64
四、使用JFreeChart实现图表

一、Hutool工具包

1、图片缩放、裁剪、格式转换、添加水印、旋转、压缩等

目前Hutool工具包中包含了一些对图片处理的工具：
https://doc.hutool.cn/pages/ImgUtil/

2、生成图形验证码

https://doc.hutool.cn/pages/captcha/

二、二维码处理

1、使用google.zxing

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.5.3</version>
</dependency>

import com.google.zxing.LuminanceSource;

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

public class BufferedImageLuminanceSource extends LuminanceSource {
	private final BufferedImage image;
	private final int left;
	private final int top;

	public BufferedImageLuminanceSource(BufferedImage image) {
		this(image, 0, 0, image.getWidth(), image.getHeight());
	}

	public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
		super(width, height);

		int sourceWidth = image.getWidth();
		int sourceHeight = image.getHeight();
		if (left + width > sourceWidth || top + height > sourceHeight) {
			throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
		}

		for (int y = top; y < top + height; y++) {
			for (int x = left; x < left + width; x++) {
				if ((image.getRGB(x, y) & 0xFF000000) == 0) {
					image.setRGB(x, y, 0xFFFFFFFF); // = white
				}
			}
		}

		this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
		this.image.getGraphics().drawImage(image, 0, 0, null);
		this.left = left;
		this.top = top;
	}

	public byte[] getRow(int y, byte[] row) {
		if (y < 0 || y >= getHeight()) {
			throw new IllegalArgumentException("Requested row is outside the image: " + y);
		}
		int width = getWidth();
		if (row == null || row.length < width) {
			row = new byte[width];
		}
		image.getRaster().getDataElements(left, top + y, width, 1, row);
		return row;
	}

	public byte[] getMatrix() {
		int width = getWidth();
		int height = getHeight();
		int area = width * height;
		byte[] matrix = new byte[area];
		image.getRaster().getDataElements(left, top, width, height, matrix);
		return matrix;
	}

	public boolean isCropSupported() {
		return true;
	}

	public LuminanceSource crop(int left, int top, int width, int height) {
		return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
	}

	public boolean isRotateSupported() {
		return true;
	}

	public LuminanceSource rotateCounterClockwise() {
		int sourceWidth = image.getWidth();
		int sourceHeight = image.getHeight();
		AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
		BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
		Graphics2D g = rotatedImage.createGraphics();
		g.drawImage(image, transform, null);
		g.dispose();
		int width = getWidth();
		return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
	}
}

import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;

/**
 * 二维码工具类
 * 
 */
public class QRCodeUtil {

	private static final String CHARSET = "utf-8";
	private static final String FORMAT_NAME = "JPG";
	// 二维码尺寸
	private static final int QRCODE_SIZE = 300;
	// LOGO宽度
	private static final int WIDTH = 60;
	// LOGO高度
	private static final int HEIGHT = 60;

	private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
		Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
		hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
		hints.put(EncodeHintType.MARGIN, 1);
		BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
				hints);
		int width = bitMatrix.getWidth();
		int height = bitMatrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		for (int x = 0; x < width; x++) {
			for (int y = 0; y < height; y++) {
				image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
			}
		}
		if (imgPath == null || "".equals(imgPath)) {
			return image;
		}
		// 插入图片
		QRCodeUtil.insertImage(image, imgPath, needCompress);
		return image;
	}

	/**
	 * 插入LOGO
	 * 
	 * @param source
	 *            二维码图片
	 * @param imgPath
	 *            LOGO图片地址
	 * @param needCompress
	 *            是否压缩
	 * @throws Exception
	 */
	private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
		File file = new File(imgPath);
		if (!file.exists()) {
			System.err.println("" + imgPath + "   该文件不存在！");
			return;
		}
		Image src = ImageIO.read(new File(imgPath));
		int width = src.getWidth(null);
		int height = src.getHeight(null);
		if (needCompress) { // 压缩LOGO
			if (width > WIDTH) {
				width = WIDTH;
			}
			if (height > HEIGHT) {
				height = HEIGHT;
			}
			Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
			BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
			Graphics g = tag.getGraphics();
			g.drawImage(image, 0, 0, null); // 绘制缩小后的图
			g.dispose();
			src = image;
		}
		// 插入LOGO
		Graphics2D graph = source.createGraphics();
		int x = (QRCODE_SIZE - width) / 2;
		int y = (QRCODE_SIZE - height) / 2;
		graph.drawImage(src, x, y, width, height, null);
		Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
		graph.setStroke(new BasicStroke(3f));
		graph.draw(shape);
		graph.dispose();
	}

	/**
	 * 生成二维码(内嵌LOGO)
	 * 
	 * @param content
	 *            内容
	 * @param imgPath
	 *            LOGO地址
	 * @param destPath
	 *            存放目录
	 * @param needCompress
	 *            是否压缩LOGO
	 * @throws Exception
	 */
	public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
		mkdirs(destPath);
		String file = new Random().nextInt(99999999) + ".jpg";
		ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
	}

	/**
	 * 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
	 * 
	 * @author lanyuan Email: mmm333zzz520@163.com
	 * @date 2013-12-11 上午10:16:36
	 * @param destPath
	 *            存放目录
	 */
	public static void mkdirs(String destPath) {
		File file = new File(destPath);
		// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
		if (!file.exists() && !file.isDirectory()) {
			file.mkdirs();
		}
	}

	/**
	 * 生成二维码(内嵌LOGO)
	 * 
	 * @param content
	 *            内容
	 * @param imgPath
	 *            LOGO地址
	 * @param destPath
	 *            存储地址
	 * @throws Exception
	 */
	public static void encode(String content, String imgPath, String destPath) throws Exception {
		QRCodeUtil.encode(content, imgPath, destPath, false);
	}

	/**
	 * 生成二维码
	 * 
	 * @param content
	 *            内容
	 * @param destPath
	 *            存储地址
	 * @param needCompress
	 *            是否压缩LOGO
	 * @throws Exception
	 */
	public static void encode(String content, String destPath, boolean needCompress) throws Exception {
		QRCodeUtil.encode(content, null, destPath, needCompress);
	}

	/**
	 * 生成二维码
	 * 
	 * @param content
	 *            内容
	 * @param destPath
	 *            存储地址
	 * @throws Exception
	 */
	public static void encode(String content, String destPath) throws Exception {
		QRCodeUtil.encode(content, null, destPath, false);
	}

	/**
	 * 生成二维码(内嵌LOGO)
	 * 
	 * @param content
	 *            内容
	 * @param imgPath
	 *            LOGO地址
	 * @param output
	 *            输出流
	 * @param needCompress
	 *            是否压缩LOGO
	 * @throws Exception
	 */
	public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
			throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
		ImageIO.write(image, FORMAT_NAME, output);
	}

	/**
	 * 生成二维码
	 * 
	 * @param content
	 *            内容
	 * @param output
	 *            输出流
	 * @throws Exception
	 */
	public static void encode(String content, OutputStream output) throws Exception {
		QRCodeUtil.encode(content, null, output, false);
	}

	/**
	 * 解析二维码
	 * 
	 * @param file
	 *            二维码图片
	 * @return
	 * @throws Exception
	 */
	public static String decode(File file) throws Exception {
		BufferedImage image;
		image = ImageIO.read(file);
		if (image == null) {
			return null;
		}
		BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
		BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
		Result result;
		Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
		hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
		result = new MultiFormatReader().decode(bitmap, hints);
		String resultStr = result.getText();
		return resultStr;
	}

	/**
	 * 解析二维码
	 * 
	 * @param path
	 *            二维码图片地址
	 * @return
	 * @throws Exception
	 */
	public static String decode(String path) throws Exception {
		return QRCodeUtil.decode(new File(path));
	}

	public static void main(String[] args) throws Exception {
		String text = "http://test";
		QRCodeUtil.encode(text, "c:/Users/Administrator/Desktop/test/1.png",
				"c:/Users/Administrator/Desktop/test/barcode", true);
	}
}

public class Testewm {

	public static void main(String[] args) throws Exception {
        String text = "";
        QRCodeUtil.encode(text,"", "F:/",true);
        
        String string = QRCodeUtil.decode("F:/70729532.jpg");
        System.out.println(string);
 }
}

三、图片生成Base64

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.codec.binary.Base64;

/**
 * 将图片转换为Base64<br>
 * 将base64编码字符串解码成img图片
 * 
 *
 */
public class Img2Base64Util {

	public static void main(String[] args) {
		String imgFile = "d:\\3.jpg";// 待处理的图片
		String imgbese = getImgStr(imgFile);
		System.out.println(imgbese.length());
		System.out.println(imgbese);
		String imgFilePath = "d:\\332.jpg";// 新生成的图片
		generateImage(imgbese, imgFilePath);
	}

	/**
	 * 将图片转换成Base64编码
	 * 
	 * @param imgFile
	 *            待处理图片
	 * @return
	 */
	public static String getImgStr(String imgFile) {
		// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理

		InputStream in = null;
		byte[] data = null;
		// 读取图片字节数组
		try {
			in = new FileInputStream(imgFile);
			data = new byte[in.available()];
			in.read(data);
			in.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return new String(Base64.encodeBase64(data));
	}

	/**
	 * 对字节数组字符串进行Base64解码并生成图片
	 * 
	 * @param imgStr
	 *            图片数据
	 * @param imgFilePath
	 *            保存图片全路径地址
	 * @return
	 */
	public static boolean generateImage(String imgStr, String imgFilePath) {
		//
		if (imgStr == null) // 图像数据为空
			return false;

		try {
			// Base64解码
			byte[] b = Base64.decodeBase64(imgStr);
			for (int i = 0; i < b.length; ++i) {
				if (b[i] < 0) {// 调整异常数据
					b[i] += 256;
				}
			}
			// 生成jpeg图片

			OutputStream out = new FileOutputStream(imgFilePath);
			out.write(b);
			out.flush();
			out.close();
			return true;
		} catch (Exception e) {
			return false;
		}
	}
}