java-根据url生成二维码

1. 生成无白边的二维码:

1.1 需要引入的jar包:

        
        
            net.glxn.qrgen
            javase
            2.0
        
        

1.2 工具类

package com.yifenqi.zulin.biz.agent.utils;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.alibaba.fastjson.JSON;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

import lombok.extern.slf4j.Slf4j;
import net.glxn.qrgen.javase.QRCode;

/**
 * 二维码 工具类
 *
 * @author zhangshiwei
 * @since 2019年7月1日 下午7:30:47
 */
@Slf4j
public class QrCodeUtils {
    /**
     * 生成不带白边的二维码
     *
     * @param content 二维码内容(目标url)
     * @param qrCodePath 生成的二维码地址(最终保存地址)
     * @throws Exception 异常
     */
    public static void generatorQrCode(String content, String qrCodePath) throws Exception {
        Map hints = new HashMap<>();

        hints.put(EncodeHintType.MARGIN, 0);
        BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, 256, 256, hints);

        // 去白边
        int[] rec = bitMatrix.getEnclosingRectangle();
        int resWidth = rec[2] + 1;
        int resHeight = rec[3] + 1;
        BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
        resMatrix.clear();
        for (int i = 0; i < resWidth; i++) {
            for (int j = 0; j < resHeight; j++) {
                if (bitMatrix.get(i + rec[0], j + rec[1])) {
                    resMatrix.set(i, j);
                }
            }
        }

        int width = resMatrix.getWidth();
        int height = resMatrix.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++) {
                if (resMatrix.get(x, y)) {
                    //                    image.setRGB(x, y, Color.BLACK.getRGB());
                    image.setRGB(x, y, -16777216);
                } else {
                    //                    image.setRGB(x, y, Color.WHITE.getRGB());
                    image.setRGB(x, y, -1);
                }
            }
        }
        ImageIO.write(image, "png", new File(qrCodePath));
    } 
}

1.3 测试:

@Test
    public void genInviteQrCode3() {
        String qrCodePath = "www.baidu.com";
        String qrCodeLocalPath = "/data1/admin/temp/百度首页22.png";
        try {
            // 生成不带白边的二维码
            QrCodeUtils.generatorQrCode(qrCodePath, qrCodeLocalPath); 
        } catch (Exception e) {
            log.info("error :{}", JSON.toJSON(e));
        }
    }

1.4 测试结果:
 

2.1 生成有边框的普通二维码:

package com.yifenqi.zulin.biz.agent.utils;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.alibaba.fastjson.JSON;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

import lombok.extern.slf4j.Slf4j;
import net.glxn.qrgen.javase.QRCode;

/**
 * 二维码 工具类
 *
 * @author zhangshiwei
 * @since 2019年7月1日 下午7:30:47
 */
@Slf4j
public class QrCodeUtils { 

    /**
     * 生成带有边框的二维码
     *
     * @param targetUrl 目标url
     * @param qrCodeLocalPath 生成的二维码地址
     */
    public static void generatorQrCodeWithWhiteFrame(String targetUrl, String qrCodeLocalPath) {
        try {
            // 读取目标文件
            FileInputStream fileInputStream = new FileInputStream(QRCode.from(targetUrl).file());
            // 写入新文件
            FileOutputStream fileOutputStream = new FileOutputStream(new File(qrCodeLocalPath));
            int in = fileInputStream.read();
            while (in != -1) {
                fileOutputStream.write(in);
                in = fileInputStream.read();
            }
            fileInputStream.close();
            fileOutputStream.close();
        } catch (Exception e) {
            log.info("error :{}", JSON.toJSON(e));
        }
    }
}

2.2 测试

@Test public void genInviteQrCode3() { String qrCodePath = "www.baidu.com"; String qrCodeLocalPath = "/data1/admin/temp/百度首页22.png"; try { // 生成带白边的二维码 QrCodeUtils.generatorQrCodeWithWhiteFrame(qrCodePath, qrCodeLocalPath); } catch (Exception e) { log.info("error :{}", JSON.toJSON(e)); } }

2.3 测试结果:

大小尺寸都是可以修改的,也可以作为参数传入util中;

我这里之所以生成无白边的二维码,是因为前端把二维码放在另外一个圆形框图中了,为了填满接触圆边才做的,一般情况下不用;