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云代码 - java代码库

java 二维码工具类(二维码生成 解析)

2012-10-23 作者: 程序猿style举报

[java]代码库

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
 
import javax.imageio.ImageIO;
 
import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.exception.DecodingFailedException;
 
import jp.sourceforge.qrcode.data.QRCodeImage;
 
/**
 * 二维码生成类
 *
 * 需要导入jar包:QRCode.jar
 *
 * TwoDimensionCode类:二维码操作核心类
 *
 */
public class TwoDimensionCode {
 
    /**
     * 生成二维码(QRCode)图片
     *
     * @param content
     *            存储内容
     * @param imgPath
     *            图片路径
     */
    public void encoderQRCode(String content, String imgPath) {
        this.encoderQRCode(content, imgPath, "png", 7);
    }
 
    /**
     * 生成二维码(QRCode)图片
     *
     * @param content
     *            存储内容
     * @param output
     *            输出流
     */
    public void encoderQRCode(String content, OutputStream output) {
        this.encoderQRCode(content, output, "png", 7);
    }
 
    /**
     * 生成二维码(QRCode)图片
     *
     * @param content
     *            存储内容
     * @param imgPath
     *            图片路径
     * @param imgType
     *            图片类型
     */
    public void encoderQRCode(String content, String imgPath, String imgType) {
        this.encoderQRCode(content, imgPath, imgType, 7);
    }
 
    /**
     * 生成二维码(QRCode)图片
     *
     * @param content
     *            存储内容
     * @param output
     *            输出流
     * @param imgType
     *            图片类型
     */
    public void encoderQRCode(String content, OutputStream output,
            String imgType) {
        this.encoderQRCode(content, output, imgType, 7);
    }
 
    /**
     * 生成二维码(QRCode)图片
     *
     * @param content
     *            存储内容
     * @param imgPath
     *            图片路径
     * @param imgType
     *            图片类型
     * @param size
     *            二维码尺寸
     */
    public void encoderQRCode(String content, String imgPath, String imgType,
            int size) {
        try {
            BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);
 
            File imgFile = new File(imgPath);
            // 生成二维码QRCode图片
            ImageIO.write(bufImg, imgType, imgFile);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /**
     * 生成二维码(QRCode)图片
     *
     * @param content
     *            存储内容
     * @param output
     *            输出流
     * @param imgType
     *            图片类型
     * @param size
     *            二维码尺寸
     */
    public void encoderQRCode(String content, OutputStream output,
            String imgType, int size) {
        try {
            BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);
            // 生成二维码QRCode图片
            ImageIO.write(bufImg, imgType, output);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /**
     * 生成二维码(QRCode)图片的公共方法
     *
     * @param content
     *            存储内容
     * @param imgType
     *            图片类型
     * @param size
     *            二维码尺寸
     * @return
     */
    private BufferedImage qRCodeCommon(String content, String imgType, int size) {
        BufferedImage bufImg = null;
        try {
            Qrcode qrcodeHandler = new Qrcode();
            // 设置二维码排错率,可选L(7%)、M(15%)、Q(25%)、H(30%),排错率越高可存储的信息越少,但对二维码清晰度的要求越小
            qrcodeHandler.setQrcodeErrorCorrect('M');
            qrcodeHandler.setQrcodeEncodeMode('B');
            // 设置设置二维码尺寸,取值范围1-40,值越大尺寸越大,可存储的信息越大
            qrcodeHandler.setQrcodeVersion(size);
            // 获得内容的字节数组,设置编码格式
            byte[] contentBytes = content.getBytes("utf-8");
            // 图片尺寸
            int imgSize = 67 + 12 * (size - 1);
            bufImg = new BufferedImage(imgSize, imgSize,
                    BufferedImage.TYPE_INT_RGB);
            Graphics2D gs = bufImg.createGraphics();
            // 设置背景颜色
            gs.setBackground(Color.WHITE);
            gs.clearRect(0, 0, imgSize, imgSize);
 
            // 设定图像颜色> BLACK
            gs.setColor(Color.BLACK);
            // 设置偏移量,不设置可能导致解析出错
            int pixoff = 2;
            // 输出内容> 二维码
            if (contentBytes.length > 0 && contentBytes.length < 800) {
                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 {
                throw new Exception("QRCode content bytes length = "
                        + contentBytes.length + " not in [0, 800].");
            }
            gs.dispose();
            bufImg.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bufImg;
    }
 
    /**
     * 解析二维码(QRCode)
     *
     * @param imgPath
     *            图片路径
     * @return
     */
    public String decoderQRCode(String imgPath) {
        // QRCode 二维码图片的文件
        File imageFile = new File(imgPath);
        BufferedImage bufImg = null;
        String content = null;
        try {
            bufImg = ImageIO.read(imageFile);
            QRCodeDecoder decoder = new QRCodeDecoder();
            content = new String(decoder.decode(new TwoDimensionCodeImage(
                    bufImg)), "utf-8");
        } catch (IOException e) {
            System.out.println("Error: " + e.getMessage());
            e.printStackTrace();
        } catch (DecodingFailedException dfe) {
            System.out.println("Error: " + dfe.getMessage());
            dfe.printStackTrace();
        }
        return content;
    }
 
    /**
     * 解析二维码(QRCode)
     *
     * @param input
     *            输入流
     * @return
     */
    public String decoderQRCode(InputStream input) {
        BufferedImage bufImg = null;
        String content = null;
        try {
            bufImg = ImageIO.read(input);
            QRCodeDecoder decoder = new QRCodeDecoder();
            content = new String(decoder.decode(new TwoDimensionCodeImage(
                    bufImg)), "utf-8");
        } catch (IOException e) {
            System.out.println("Error: " + e.getMessage());
            e.printStackTrace();
        } catch (DecodingFailedException dfe) {
            System.out.println("Error: " + dfe.getMessage());
            dfe.printStackTrace();
        }
        return content;
    }
 
    public static void main(String[] args) {
        String imgPath = "C:/temp/temp.png";
        String encoderContent = "http://yuncode.net";
        TwoDimensionCode handler = new TwoDimensionCode();
        handler.encoderQRCode(encoderContent, imgPath, "png");
        // try {
        // OutputStream output = new FileOutputStream(imgPath);
        // handler.encoderQRCode(content, output);
        // } catch (Exception e) {
        // e.printStackTrace();
        // }
        System.out.println("生成二维码成功");
 
        String decoderContent = handler.decoderQRCode(imgPath);
        System.out.println("解析结果如下:");
        System.out.println(decoderContent);
        System.out.println("解析二维码成功");
    }
}
 
/**
 * TwoDimensionCodeImage 类:二维码图片对象
 *
 */
class TwoDimensionCodeImage implements QRCodeImage {
 
    BufferedImage bufImg;
 
    public TwoDimensionCodeImage(BufferedImage bufImg) {
        this.bufImg = bufImg;
    }
 
    @Override
    public int getHeight() {
        return bufImg.getHeight();
    }
 
    @Override
    public int getPixel(int x, int y) {
        return bufImg.getRGB(x, y);
    }
 
    @Override
    public int getWidth() {
        return bufImg.getWidth();
    }
 
}


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