zbb20181221 java,二维码

1、maven

<!-- 二维码 -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.0</version>
        </dependency>

2、ZxingHandler

package com.zbb.app.erweima;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.util.Hashtable;
import java.util.Map;
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.LuminanceSource;
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.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * 二维码生成器
 * 
 * @blog 
 * @author zhaozhen02
 */
public class ZxingHandler {

    /**
     * 生成二维码
     * 
     * @param contents
     * @param width
     * @param height
     * @param imgPath
     * @throws Exception 
     */
    public static void encode(String contents, int width, int height, String imgPath)
            throws Exception {
        Map<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        // 指定纠错等级
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
        // 指定编码格式
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");

        BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width,
                height, hints);

        MatrixToImageWriter.writeToStream(bitMatrix, "png", new FileOutputStream(imgPath));

    }

    /**
     * 解析二维码
     * 
     * @param imgPath
     * @return
     * @throws Exception 
     */
    public static String decode(String imgPath) throws Exception {
        BufferedImage image = null;
        Result result = null;

        image = ImageIO.read(new File(imgPath));
        if (image == null) {
            System.out.println("the decode image may be not exit.");
        }
        LuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

        Map<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
        hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");

        result = new MultiFormatReader().decode(bitmap, hints);
        return result.getText();

    }

    public static void main(String[] args) throws Exception {
        encode("https://www.cnblogs.com/super-admin/", 300, 400,
                "C:\Users\Administrator\Desktop\temp\test2.png");

        System.out.println(decode("C:\\Users\\Administrator\\Desktop\\temp\\test2.png"));

    }

}