技術標籤：JAVA

本工具類基於Google二維碼框架zxing3.1.0實現。

1. pom.xml中依賴包設定

<dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.1.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.zxing</
 
groupId>
        <artifactId>javase</artifactId>
        <version>3.1.0</version>
    </dependency>

2. 二維碼工具類

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
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;
 
import javax.imageio.ImageIO;
 
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.
 
google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 
/**
 * 二維碼工具類
 * 
 */
public class QRCodeUtil {
	private static final String CHARSET = "utf-8";
	private static final String FORMAT = "JPG";
	// 二維碼尺寸
	private static final int QRCODE_SIZE = 300;
	// LOGO寬度
	private static final int LOGO_WIDTH = 60;
	// LOGO高度
	private static final int LOGO_HEIGHT = 60;
 
	private static BufferedImage createImage(String content, String logoPath, 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 (logoPath == null || "".equals(logoPath)) {
			return image;
		}
		// 插入圖片
		QRCodeUtil.insertImage(image, logoPath, needCompress);
		return image;
	}
 
	/**
	 * 插入LOGO
	 * 
	 * @param source
	 *            二維碼圖片
	 * @param logoPath
	 *            LOGO圖片地址
	 * @param needCompress
	 *            是否壓縮
	 * @throws Exception
	 */
	private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception {
		File file = new File(logoPath);
		if (!file.exists()) {
			throw new Exception("logo file not found.");
		}
		Image src = ImageIO.read(new File(logoPath));
		int width = src.getWidth(null);
		int height = src.getHeight(null);
		if (needCompress) { // 壓縮LOGO
			if (width > LOGO_WIDTH) {
				width = LOGO_WIDTH;
			}
			if (height > LOGO_HEIGHT) {
				height = LOGO_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); // 繪製縮小後的圖
			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();
	}
 
	/**
	 * 生成二維碼(內嵌LOGO)
	 * 二維碼檔名隨機，檔名可能會有重複
	 * 
	 * @param content
	 *            內容
	 * @param logoPath
	 *            LOGO地址
	 * @param destPath
	 *            存放目錄
	 * @param needCompress
	 *            是否壓縮LOGO
	 * @throws Exception
	 */
	public static String encode(String content, String logoPath, String destPath, boolean needCompress) throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
		mkdirs(destPath);
		String fileName = new Random().nextInt(99999999) + "." + FORMAT.toLowerCase();
		ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
		return fileName;
	}
	
	/**
	 * 生成二維碼(內嵌LOGO)
	 * 呼叫者指定二維碼檔名
	 * 
	 * @param content
	 *            內容
	 * @param logoPath
	 *            LOGO地址
	 * @param destPath
	 *            存放目錄
	 * @param fileName
	 *            二維碼檔名
	 * @param needCompress
	 *            是否壓縮LOGO
	 * @throws Exception
	 */
	public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
		mkdirs(destPath);
		fileName = fileName.substring(0, fileName.indexOf(".")>0?fileName.indexOf("."):fileName.length()) 
				+ "." + FORMAT.toLowerCase();
		ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
		return fileName;
	}
 
	/**
	 * 當資料夾不存在時，mkdirs會自動建立多層目錄，區別於mkdir．
	 * (mkdir如果父目錄不存在則會丟擲異常)
	 * @param destPath
	 *            存放目錄
	 */
	public static void mkdirs(String destPath) {
		File file = new File(destPath);
		if (!file.exists() && !file.isDirectory()) {
			file.mkdirs();
		}
	}
 
	/**
	 * 生成二維碼(內嵌LOGO)
	 * 
	 * @param content
	 *            內容
	 * @param logoPath
	 *            LOGO地址
	 * @param destPath
	 *            儲存地址
	 * @throws Exception
	 */
	public static String encode(String content, String logoPath, String destPath) throws Exception {
		return QRCodeUtil.encode(content, logoPath, destPath, false);
	}
 
	/**
	 * 生成二維碼
	 * 
	 * @param content
	 *            內容
	 * @param destPath
	 *            儲存地址
	 * @param needCompress
	 *            是否壓縮LOGO
	 * @throws Exception
	 */
	public static String encode(String content, String destPath, boolean needCompress) throws Exception {
		return QRCodeUtil.encode(content, null, destPath, needCompress);
	}
 
	/**
	 * 生成二維碼
	 * 
	 * @param content
	 *            內容
	 * @param destPath
	 *            儲存地址
	 * @throws Exception
	 */
	public static String encode(String content, String destPath) throws Exception {
		return QRCodeUtil.encode(content, null, destPath, false);
	}
 
	/**
	 * 生成二維碼(內嵌LOGO)
	 * 
	 * @param content
	 *            內容
	 * @param logoPath
	 *            LOGO地址
	 * @param output
	 *            輸出流
	 * @param needCompress
	 *            是否壓縮LOGO
	 * @throws Exception
	 */
	public static void encode(String content, String logoPath, OutputStream output, boolean needCompress)
			throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
		ImageIO.write(image, FORMAT, output);
	}
 
	/**
	 * 生成二維碼
	 * 
	 * @param content
	 *            內容
	 * @param output
	 *            輸出流
	 * @throws Exception
	 */
	public static void encode(String content, OutputStream output) throws Exception {
		QRCodeUtil.encode(content, null, output, false);
	}
 
	/**
	 * 解析二維碼
	 * 
	 * @param file
	 *            二維碼圖片
	 * @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;
	}
 
	/**
	 * 解析二維碼
	 * 
	 * @param path
	 *            二維碼圖片地址
	 * @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://www.baidu.com";
		//不含Logo
		//QRCodeUtil.encode(text, null, "e:\\", true);
		//含Logo，不指定二維碼圖片名
		//QRCodeUtil.encode(text, "e:\\csdn.jpg", "e:\\", true);
		//含Logo，指定二維碼圖片名
		QRCodeUtil.encode(text, "e:\\csdn.jpg", "e:\\", "qrcode", true);
	}
}

參考資料:

1. http://blog.csdn.net/mmm333zzz/article/details/17259513
2. http://kesun-shy.iteye.com/blog/2154169