Java生成二維碼

場景:將某一段內容加密到二維碼裏面,如url,用戶去掃描,打開網頁....

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Java如何生成二維碼
   1.利用google的zxing,來實現
   2.依賴jar包:zxing

點擊下載所有依賴jar包

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直接上Code

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Map;

/**
 * 利用zxing開源工具生成二維碼QRCode
 *
 * @author simon
 */
public class QRCode {
    private static final int BLACK = 0xff000000;
    private static final int WHITE = 0xFFFFFFFF;

    /**
     * @param args
     */
    public static void main(String[] args) {
        String filePostfix = "png";
        File file = new File("/home/simon/桌面/test." + filePostfix);
        encode("http://11.com/admin", file, filePostfix, BarcodeFormat.QR_CODE, 5000, 5000, null);
        //test.decode(file);
    }

    /**
     * 生成QRCode二維碼<br>
     * 在編碼時需要將com.google.zxing.qrcode.encoder.Encoder.java中的<br>
     * static final String DEFAULT_BYTE_MODE_ENCODING = "ISO8859-1";<br>
     * 修改爲UTF-8，否則中文編譯後解析不了<br>
     *
     * @param contents    二維碼的內容
     * @param file        二維碼保存的路徑，如：C://test_QR_CODE.png
     * @param filePostfix 生成二維碼圖片的格式：png,jpeg,gif等格式
     * @param format      qrcode碼的生成格式
     * @param width       圖片寬度
     * @param height      圖片高度
     * @param hints
     */
    public static void encode(String contents, File file, String filePostfix, BarcodeFormat format, int width, int height, Map<EncodeHintType, ?> hints) {
        try {
            contents = new String(contents.getBytes("UTF-8"), "ISO-8859-1");
            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, format, width, height);
            writeToFile(bitMatrix, filePostfix, file);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 生成二維碼圖片<br>
     *
     * @param matrix
     * @param format 圖片格式
     * @param file   生成二維碼圖片位置
     * @throws IOException
     */
    public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        ImageIO.write(image, format, file);
    }

    /**
     * 生成二維碼內容<br>
     *
     * @param matrix
     * @return
     */
    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) == true ? BLACK : WHITE);
            }
        }
        return image;
    }

    /**
     * 解析QRCode二維碼
     */
    @SuppressWarnings("unchecked")
    public void decode(File file) {
        try {
            BufferedImage image;
            try {
                image = ImageIO.read(file);
                if (image == null) {
                    System.out.println("Could not decode image");
                }
                LuminanceSource source = new BufferedImageLuminanceSource(image);
                BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
                Result result;
                @SuppressWarnings("rawtypes")
                Hashtable hints = new Hashtable();
                //解碼設置編碼方式爲：utf-8
                hints.put(DecodeHintType.CHARACTER_SET, "utf-8");
                result = new MultiFormatReader().decode(bitmap, hints);
                String resultStr = result.getText();
                System.out.println("解析後內容：" + resultStr);
            } catch (IOException ioe) {
                System.out.println(ioe.toString());
            } catch (ReaderException re) {
                System.out.println(re.toString());
            }
        } catch (Exception ex) {
            System.out.println(ex.toString());
        }
    }
}