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当前文章 : 《使用Java生成二维码》

5/5/2019 —— 

  Java 

加入依赖

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 <dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>2.2</version>
 </dependency>
 <dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>2.2</version>
  </dependency>

编写工具类

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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.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Map;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import javax.servlet.http.HttpServletResponse;

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;


/**
*@date: 2018年10月15日 下午2:06:44
*@说明:
**/
public class QRCodeUtil {

    private static final String CHARSET = "utf-8";  
    
    private static final String FORMAT_NAME = "JPG";  
    // 二维码尺寸  
    private static  int QRCODE_SIZE = 300;  
    // LOGO宽度  
    private static  int WIDTH = 60;  
    // LOGO高度  
    private static  int HEIGHT = 60;  
    
    
    
    
    /** 
     * 生成并保存二维码
     * @param content 
     * @param imgPath   logo图片 
     * @param destPath  保存路径
     * @param needCompress  是否要压缩 
     * @throws Exception 
     */  
    public static String 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";//生成随机文件名  
        ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
        return file;
    }  
    
    
    /** 
     * 生成并保存二维码
     */  
    public static void saveQrCode(Map<String,Object> map, String destPath) throws Exception {  
    	String content  = map.get("content")==""?"":map.get("content").toString();
    	String imgPath  = map.get("imgPath")==""?null:map.get("imgPath").toString();
        QRCODE_SIZE = map.get("QRCODE_SIZE")==""?QRCODE_SIZE:Integer.parseInt(map.get("QRCODE_SIZE").toString());
        WIDTH = map.get("WIDTH")==""?WIDTH:Integer.parseInt(map.get("WIDTH").toString());
        HEIGHT = map.get("HEIGHT")==""?HEIGHT:Integer.parseInt(map.get("HEIGHT").toString());
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, true);  
        mkdirs(destPath);  
        ImageIO.write(image, FORMAT_NAME, new File(destPath));
    }  
    
    
    /** 
     * 生成并下载二维码
     * @param map 
     * @throws Exception 
     */  
    public static void encode(Map<String,Object> map,boolean needCompress,HttpServletResponse response) throws Exception {  
    	String content  = map.get("content")==""?"":map.get("content").toString();
    	String imgPath  = map.get("imgPath")==""?null:map.get("imgPath").toString();
        QRCODE_SIZE = map.get("QRCODE_SIZE")==""?QRCODE_SIZE:Integer.parseInt(map.get("QRCODE_SIZE").toString());
        WIDTH = map.get("WIDTH")==""?WIDTH:Integer.parseInt(map.get("WIDTH").toString());
        HEIGHT = map.get("HEIGHT")==""?HEIGHT:Integer.parseInt(map.get("HEIGHT").toString());
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);  
        String filename = "QRCode.jpg";//
        //BufferedImage 转 InputStream
	    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
	    ImageOutputStream imageOutput = ImageIO.createImageOutputStream(byteArrayOutputStream);
	    //ImageIO.write(image, FORMAT_NAME, response.getOutputStream());
	    ImageIO.write(image, FORMAT_NAME, imageOutput);
	    InputStream inputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
	    long length = imageOutput.length();
	    //设置response
	    response.setContentType("application/x-msdownload");
	    response.setContentLength((int)length);
	    response.setHeader("Content-Disposition","attachment;filename="+new String(filename.getBytes("gbk"),"iso-8859-1"));
	    //输出流
	    byte[] bytes = new byte[1024];
	    OutputStream outputStream = response.getOutputStream();
	    long count = 0;
	    while(count < length){
	        int len = inputStream.read(bytes, 0, 1024);
	        count +=len;
	        outputStream.write(bytes, 0, len);
	    }
	    outputStream.flush();
    }  
      
    /** 
     * 生成二维码以流的方式返回前台
     * @param map 
     * @throws Exception 
     */  
    public static void encodeShowQRCode(Map<String,Object> map,boolean needCompress,HttpServletResponse response) throws Exception {  
    	String content  = map.get("content")==""?"":map.get("content").toString();
    	String imgPath  = map.get("imgPath")==""?null:map.get("imgPath").toString();
        QRCODE_SIZE = map.get("QRCODE_SIZE")==""?QRCODE_SIZE:Integer.parseInt(map.get("QRCODE_SIZE").toString());
        WIDTH = map.get("WIDTH")==""?WIDTH:Integer.parseInt(map.get("WIDTH").toString());
        HEIGHT = map.get("HEIGHT")==""?HEIGHT:Integer.parseInt(map.get("HEIGHT").toString());
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);  
	    ImageIO.write(image, FORMAT_NAME, response.getOutputStream());
    }  
  
    /** 
     * 生成二维码 
     * @param content   源内容 
     * @param imgPath   生成二维码保存的路径 
     * @param needCompress  是否要压缩 
     * @return      返回二维码图片 
     * @throws Exception 
     */  
    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {  
        Hashtable hints = new Hashtable();  
        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;  
    }  
  
    /** 
     * 在生成的二维码中插入图片 
     * @param source 
     * @param imgPath 
     * @param needCompress 
     * @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();  
    }  
  
   
  
    
    public static void mkdirs(String destPath) {  
        File file = new File(destPath);  
        if (!file.exists() && !file.isDirectory()) {  
            file.mkdirs();  
        }  
    }  
  

  
      
    /** 
     * 解析二维码
     * @param file  二维码图片文件 
     * @return   返回从二维码中解析到的数据值 
     * @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 hints = new Hashtable();  
        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 二维码文件路径
     * @return
     * @throws Exception
     */
    public static String decode(String path) throws Exception {  
        return QRCodeUtil.decode(new File(path));  
    }  
 
    
       public static void main(String[] args) {
    	    try {
    	 System.out.println(QRCODE_SIZE);   	
    	 QRCODE_SIZE = 200;
    	 System.out.println(QRCODE_SIZE);
    	String text = "http://192.168.0.6:8081/djbzbgl/partyVideo/QrCode";  
    	//生成带logo 的二维码   
    	QRCodeUtil.encode(text, "c:/work/wfqrcode/Tulips.jpg", "c:/work/wfqrcode", true);
    	//生成不带logo 的二维码  
    	//QRCodeUtil.encode(text,"","c:/work/wfqrcode",true);  
    	
    	//指定二维码图片，解析返回数据  
    	//System.out.println(QRCodeUtil.decode("c:/work/wfqrcode.jpg"));  
    	} catch (Exception e) {
    	e.printStackTrace();
    	} 
	}
    
}
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