神奇的二維碼

以前看到二維碼，總覺得這是一個神奇的東西，也沒有去深入的瞭解過，最近一個偶然的機會接觸到了二維碼，真實的體會了它的奧妙之處，然後就從中汲取了一些養分與大家分享，希望對大家有用，代碼如下：

工具類（QRCodeUtil ）

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 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;

public class QRCodeUtil {
	private static final String CHARSET = "utf-8"; 
	private static final String FORMAT = "JPG"; 
	private static final int QRCODE_SIZE = 300; // 二維碼尺寸  
	private static final int LOGO_WIDTH = 60; // LOGO高度  
	private static final int LOGO_HEIGHT = 60;// LOGO寬度  

	
	 /**
     * 生成二維碼
     *
     * @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,String fileName)
			throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
		mkdirs(destPath);
		ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName+".jpg"));
		return destPath + "/" + fileName+".jpg";
	}
	


	 /**
     * 當文件夾不存在時，mkdirs會自動創建多層目錄，區別於mkdir． 
     * (mkdir如果父目錄不存在則會拋出異常) 
     * @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
     *            存儲地址 
     * @throws Exception
     */ 
	public static void encode(String content, String destPath, boolean needCompress,String fileName) throws Exception {
		QRCodeUtil.encode(content, null, destPath, needCompress,fileName);
	}

	
	/* 生成二維碼 
     *
     * @param content
     *            內容 
     * @param destPath
     *            存儲地址 
     * @throws Exception
     */
	 public static void encode(String content, String destPath,String fileName) throws Exception {
		 QRCodeUtil.encode(content, null, destPath, false, fileName);
	}	
	 
	/**
     * 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));
	}	
	
	
	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();
	}
	
}

在pom.xml中注入依賴：

<!-- zxing實現二維碼生成和解析 -->
<dependency>  
        <groupId>com.google.zxing</groupId>  
        <artifactId>core</artifactId>  
        <version>3.0.0</version>  
</dependency>  
<dependency>  
        <groupId>com.google.zxing</groupId>  
        <artifactId>javase</artifactId>  
        <version>3.0.0</version>  
</dependency>


<!-- json依賴 -->
<!-- 第一種 -->
<dependency>
	    <groupId>net.sf.json-lib</groupId>
	    <artifactId>json-lib</artifactId>
	    <version>2.4</version>
	    <classifier>jdk15</classifier>
</dependency>	

<!-- 第二種 -->
<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>fastjson</artifactId>		
</dependency>

測試類Test(第一種json依賴)

import com.alibaba.fastjson.JSONObject;

public class Test {
 
	public static void main(String[] args) throws Exception {
		JSONObject json = new JSONObject();  
        json.put(  
                "zxing",  
                "https://github.com/zxing/zxing/tree/zxing-3.0.0/javase/src/main/java/com/google/zxing");  
        json.put("author", "jo");  
        String content = json.toJSONString();// 內容  
		//生成不帶logo 的二維碼
		String encode = QRCodeUtil.encode(content,null,"D://home", false,"555");
		System.out.println(encode);
		
	}
}

測試類Test2(第二種json依賴)

import net.sf.json.JSONObject;

public class Test2 {
 
	public static void main(String[] args) throws Exception {
		JSONObject json = new JSONObject();  
        json.put(  
                "zxing",  
                "https://github.com/zxing/zxing/tree/zxing-3.0.0/javase/src/main/java/com/google/zxing");  
        json.put("author", "jo");  
        String content = json.toString();// 內容  
		//生成不帶logo 的二維碼
		//QRCodeUtil.encode(content,"D://home","2222");
		String encode = QRCodeUtil.encode(content,null,"D://home", false,"555");
		System.out.println(encode);
	}
}