Java實現二維碼QRCode的編碼和解碼

時間 2019-11-21

標籤 java 實現二維 qrcode 編碼解碼欄目 Java 简体版

原文原文鏈接

涉及到的一些主要類庫，方便你們下載：html

編碼lib：Qrcode_swetake.jar （官網介紹-- http://www.swetake.com/qr/index-e.html） java

解碼lib：qrcode.jar （官網介紹-- http://sourceforge.jp/projects/qrcode/）android

【一】、編碼：測試

Java代碼QRCodeEncoderHandler.javathis

package michael.qrcode; 
 
import java.awt.Color; 
import java.awt.Graphics2D; 
import java.awt.image.BufferedImage; 
import java.io.File; 
 
import javax.imageio.ImageIO; 
 
import com.swetake.util.Qrcode; 
 
/**
 * 二維碼生成器
 * @blog http://sjsky.iteye.com
 * @author Michael
 */ 
public class QRCodeEncoderHandler { 
 
    /**
     * 生成二維碼(QRCode)圖片
     * @param content
     * @param imgPath
     */ 
    public void encoderQRCode(String content, String imgPath) { 
        try { 
 
            Qrcode qrcodeHandler = new Qrcode(); 
            qrcodeHandler.setQrcodeErrorCorrect('M'); 
            qrcodeHandler.setQrcodeEncodeMode('B'); 
            qrcodeHandler.setQrcodeVersion(7); 
 
            System.out.println(content); 
            byte[] contentBytes = content.getBytes("gb2312"); 
 
            BufferedImage bufImg = new BufferedImage(140, 140, 
                    BufferedImage.TYPE_INT_RGB); 
 
            Graphics2D gs = bufImg.createGraphics(); 
 
            gs.setBackground(Color.WHITE); 
            gs.clearRect(0, 0, 140, 140); 
 
            // 設定圖像顏色> BLACK 
            gs.setColor(Color.BLACK); 
 
            // 設置偏移量 不設置可能致使解析出錯 
            int pixoff = 2; 
            // 輸出內容> 二維碼 
            if (contentBytes.length > 0 && contentBytes.length < 120) { 
                boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes); 
                for (int i = 0; i < codeOut.length; i++) { 
                    for (int j = 0; j < codeOut.length; j++) { 
                        if (codeOut[j][i]) { 
                            gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3); 
                        } 
                    } 
                } 
            } else { 
                System.err.println("QRCode content bytes length = " 
                        + contentBytes.length + " not in [ 0,120 ]. "); 
            } 
 
            gs.dispose(); 
            bufImg.flush(); 
 
            File imgFile = new File(imgPath); 
 
            // 生成二維碼QRCode圖片 
            ImageIO.write(bufImg, "png", imgFile); 
 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
 
    } 
 
    /**
     * @param args the command line arguments
     */ 
    public static void main(String[] args) { 
        String imgPath = "D:/test/twocode/Michael_QRCode.png"; 
 
        String content = "Hello 大大、小小,welcome to QRCode!" 
                + "\nMyblog [ http://sjsky.iteye.com ]" 
                + "\nEMail [ sjsky007@gmail.com ]" + "\nTwitter [ @suncto ]"; 
 
        QRCodeEncoderHandler handler = new QRCodeEncoderHandler(); 
        handler.encoderQRCode(content, imgPath); 
 
        System.out.println("encoder QRcode success"); 
    } 
}

運行後生成的二維碼圖片以下：編碼

此時就可用手機的二維碼掃描軟件（本人用的：android 快拍二維碼）來測試下，識別成功的截圖以下：spa

喜歡的朋友能夠下載後試一試，作一些名片或者本身喜歡的東西。固然Java也能夠對二維碼圖片解碼，具體看下面關於解碼的內容。code

【二】、解碼：htm

Java代碼QRCodeDecoderHandler.javablog

package michael.qrcode; 
 
import java.awt.image.BufferedImage; 
import java.io.File; 
import java.io.IOException; 
 
import javax.imageio.ImageIO; 
 
import jp.sourceforge.qrcode.QRCodeDecoder; 
import jp.sourceforge.qrcode.data.QRCodeImage; 
import jp.sourceforge.qrcode.exception.DecodingFailedException; 
 
/**
 * @blog http://sjsky.iteye.com
 * @author Michael
 */ 
public class QRCodeDecoderHandler { 
 
    /**
     * 解碼二維碼
     * @param imgPath
     * @return String
     */ 
    public String decoderQRCode(String imgPath) { 
 
        // QRCode 二維碼圖片的文件 
        File imageFile = new File(imgPath); 
 
        BufferedImage bufImg = null; 
        String decodedData = null; 
        try { 
            bufImg = ImageIO.read(imageFile); 
 
            QRCodeDecoder decoder = new QRCodeDecoder(); 
            decodedData = new String(decoder.decode(new J2SEImage(bufImg))); 
 
            // try { 
            // System.out.println(new String(decodedData.getBytes("gb2312"), 
            // "gb2312")); 
            // } catch (Exception e) { 
            // // TODO: handle exception 
            // } 
        } catch (IOException e) { 
            System.out.println("Error: " + e.getMessage()); 
            e.printStackTrace(); 
        } catch (DecodingFailedException dfe) { 
            System.out.println("Error: " + dfe.getMessage()); 
            dfe.printStackTrace(); 
        } 
        return decodedData; 
    } 
 
    /**
     * @param args the command line arguments
     */ 
    public static void main(String[] args) { 
        QRCodeDecoderHandler handler = new QRCodeDecoderHandler(); 
        String imgPath = "d:/test/twocode/Michael_QRCode.png"; 
        String decoderContent = handler.decoderQRCode(imgPath); 
        System.out.println("解析結果以下："); 
        System.out.println(decoderContent); 
        System.out.println("========decoder success!!!"); 
    } 
 
    class J2SEImage implements QRCodeImage { 
        BufferedImage bufImg; 
 
        public J2SEImage(BufferedImage bufImg) { 
            this.bufImg = bufImg; 
        } 
 
        public int getWidth() { 
            return bufImg.getWidth(); 
        } 
 
        public int getHeight() { 
            return bufImg.getHeight(); 
        } 
 
        public int getPixel(int x, int y) { 
            return bufImg.getRGB(x, y); 
        } 
 
    } 
}