java web 二維碼生成

pom支持:
<!-- 二維碼支持包 start-->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.2.0</version>
</dependency>

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.2.0</version>
</dependency>
<!-- 二維碼支持包 end-->

工具類支持:
package com.example.demo.dao.qrcode;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;

/**
 * @author jin.tang
 * @Title: springbootdemo
 * @Package com.example.demo.dao.qrcode
 * @Description: java web二維碼生成器
 * @date 2017/12/25
 */
@Slf4j
public class QRCodeUtil {

    /**
     * 方式一:流的方式直接生成web版本二維碼
     * 默認的二維碼外觀(可設置高寬)
         * @param url      要生成二維碼的路徑
     * @param response response對象
     * @param width    二維碼寬度
     * @param height   二維碼高度
     * @throws IOException
     */
    public static void getTwoDimension(String url, HttpServletResponse response, int width, int height) throws IOException {
        if (url != null && !"".equals(url)) {
            ServletOutputStream stream = null;
            try {
                stream = response.getOutputStream();
                QRCodeWriter writer = new QRCodeWriter();
                BitMatrix m = writer.encode(url, BarcodeFormat.QR_CODE, height, width);
                MatrixToImageWriter.writeToStream(m, "png", stream);
            } catch (WriterException e) {
                e.printStackTrace();
                log.error("生成二維碼失敗!");
            } finally {
                if (stream != null) {
                    stream.flush();
                    stream.close();
                }
            }
        }
    }

    /**
     * 方式二:返回ResponseEntity的方式顯示二維碼
   * 可設置二維碼外觀顏色,logo圖片
     * @param url    二維碼對於URL
     * @param width  二維碼寬
     * @param height 二維碼高
     * @param format 二維碼格式
     * @param logPath logo圖片路徑
     * @param needLogo 二維碼是否須要生成logo
     * @return
     * @throws WriterException
     * @throws IOException
     */
    // 直接在頁面顯示
    public  static ResponseEntity<byte[]> getResponseEntity(String url, String logPath, boolean needLogo,String format,int width,int height)throws Exception {
        BufferedImage image = QRCodeUtil.createImage(url, logPath,needLogo,width,height);

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ImageIO.write(image, format, out);//將BufferedImage轉成out輸出流
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        return new ResponseEntity<byte[]>(out.toByteArray(),
                headers, HttpStatus.CREATED);
    }

      /**
        * 方式三:以流的形式直接顯示二維碼
     * 可設置二維碼外觀顏色,logo圖片
     */
    public static void showQrcode(String url, String logPath,HttpServletResponse response, boolean needLog,String format,int width,int height)throws Exception {
        BufferedImage image = QRCodeUtil.createImage(url, logPath,needLog,width,height);
        boolean bl = ImageIO.write(image, format, response.getOutputStream());
        System.out.println(" boolean is " + bl);
    }    /** 方式四:生成二維碼文件存儲
   * 可設置二維碼外觀顏色,logo圖片
     * @param logPath
     * @param destPath 存儲路徑
     * @param fileName  存儲文件名稱(不須要後綴)
     * @param needLog
     * @param format
     * @param width
     * @param height
     * @return
     * @throws Exception
     */
    public static boolean SaveQrCode(String url, String logPath,
                                 boolean needLog,String format,int width,int height,String destPath, String fileName) throws Exception {

        boolean flag = false;
        BufferedImage image;
        try {
            image = QRCodeUtil.createImage(url, logPath,needLog,width,height);
            File file = new File(destPath);
            // 當文件夾不存在時，mkdirs會自動建立多層目錄，區別於mkdir．(mkdir若是父目錄不存在則會拋出異常)
            if (!file.exists() && !file.isDirectory()) {
                file.mkdirs();
            }
            String fileUrl = fileName + "."+format;
            ImageIO.write(image, format, new File(destPath + "/" + fileUrl));
            flag = true;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return flag;
    }       /**
        * 生成二維碼圖片私有方法
     */
    private static BufferedImage createImage (String url, String imgPath,boolean needCompress,
                                                           int width, int height) throws Exception {
        Hashtable hints = new Hashtable();

        // 二維碼糾錯級別：由高到低 H、Q、M、L
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        // 二維碼邊界空白大小由大到小 四、三、二、1(默認爲4)
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(url,
                BarcodeFormat.QR_CODE, width, height, hints);

        int H = bitMatrix.getHeight();
        int W = bitMatrix.getWidth();
        int L = getFinderPatternWidth(bitMatrix) + 3;
        int[] pixels = new int[W * H];
        // 二維碼角顏色，依次爲左上、左下、右上
        Color redColor = new Color(182, 0, 5);
        int redColorInt = redColor.getRGB();
        Color greenColor = new Color(0, 124, 54);
        int greenColorInt = greenColor.getRGB();
        Color blueColor = new Color(0, 64, 152);
        int blueColorInt = blueColor.getRGB();
        for (int y = 0; y < H; y++) {
            for (int x = 0; x < W; x++) {
                // 顏色漸變程度,RGB(158，255，158)
                int num1 = (int) (158 - (158.0 - 30.0) / bitMatrix.getHeight()
                        * (y + 1));
                int num2 = (int) (255 - (255.0 - 80.0) / bitMatrix.getHeight()
                        * (y + 1));
                int num3 = (int) (158 - (158.0 - 130.0) / bitMatrix.getHeight()
                        * (y + 1));
                Color color = new Color(num1, num2, num3);
                int colorInt = color.getRGB();
                // 此處能夠修改二維碼的顏色，能夠分別制定二維碼和背景的顏色；
                pixels[y * W + x] = bitMatrix.get(x, y) ? colorInt : 0xffffff;
            }
        }

        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);

        image.getRaster().setDataElements(0, 0, W, H, pixels);
        if (imgPath == null || "".equals(imgPath)) {
            return image;
        }
        // 插入圖片
        QRCodeUtil.insertImage(image, imgPath, needCompress,width,height);
        return image;    }

    private static int getFinderPatternWidth(BitMatrix matrix) {
        int W = matrix.getWidth();
        int H = matrix.getHeight();
        int length = 0;
        boolean flag = false;
        for (int y = 0; y < H; y++) {
            for (int x = 0; x < W; x++) {
                if (matrix.get(x, y) == true) {
                    flag = true;
                    length++;
                } else {
                    if (flag != false) {
                        return x;
                    }
                }
            }
        }
        return length;
    }
         /**
        * 在二維碼中插入圖片
     */
    private static void insertImage(BufferedImage source, String imgPath,
                                    boolean needCompress,int wid,int hei) throws Exception {
        File file = new File(imgPath);
        if (!file.exists()) {
            System.err.println("" + imgPath + "   該文件不存在！");
            return;
        }
        Image src = ImageIO.read(new File(imgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) {
            // 壓縮LOGO
            if (width > wid) {
                width = wid;
            }
            if (height > hei) {
                height = hei;
            }
            Image image = src.getScaledInstance(width, height,
                    Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_RGB);
            // 繪製縮小後的圖
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null);
            g.dispose();
            src = image;
        }
        // 插入LOGO位置
        Graphics2D graph = source.createGraphics();
        int x = (wid - width) / 2;
        int y = (hei - height) / 2;
      /*
       * int x = QRCODE_SIZE - width - 20; int y = QRCODE_SIZE - height - 20;
       */

        graph.drawImage(src, x, y, width, height, null);

        // logo邊框
      /*
       * Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
       * graph.setStroke(new BasicStroke(3f)); graph.draw(shape);
       */

        graph.dispose();
    }

controller中調用:

package com.example.demo.controller;

import com.example.demo.dao.qrcode.QRCodeUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author jin.tang
 * @Title: springbootdemo
 * @Package com.example.demo.controller
 * @Description: ${todo}
 * @date 2017/12/25
 */
@Slf4j
@Controller
public class QRCodeController {
    /**
     * 得到二維碼
     * @param request
     * @param response
     */
    @RequestMapping(value = "phoneversion/getTwoDimension",method={RequestMethod.POST,RequestMethod.GET})
    public void getTwoDimensionForIOSs(HttpServletRequest request, HttpServletResponse response){
        try {
            QRCodeUtil.getTwoDimension("https://bbs.hupu.com/bxj", response, 300, 300);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }    @RequestMapping("/downloadIOSAPPQRCode")
    public ResponseEntity<byte[]> downloadIOSAPPController(/*@RequestParam(required = true)String type*/)
            throws Exception{
//        InputStream is = this.getClass().getClassLoader().getResourceAsStream("app.properties");
//        Properties props = new Properties();
//        props.load(is);
//        String appId = (String)props.get(type);
//        String url = "" + appId;
        return QRCodeUtil.getResponseEntity("https://www.zhibo8.cc", "F:\\logo.png",true,"png", 300, 300);
    }    @RequestMapping("/showQrcode")
    public void showQrcode(HttpServletRequest request, HttpServletResponse response)
            throws Exception{
        QRCodeUtil.showQrcode("https://www.zhibo8.cc", "",response,false,"png", 300, 300);
    }    @RequestMapping("/SaveQrCode")
    public void SaveQrCode(HttpServletRequest request, HttpServletResponse response)
            throws Exception{
        boolean flag=QRCodeUtil.SaveQrCode("https://www.zhibo8.cc", "",false,"png", 300, 300,"D:\\","qrcode");
        log.info("flag=="+flag);
    }
}
前端顯示:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>首頁</title>
</head>
<body>
<p>二維碼圖片1:</p>
<div><img src="/phoneversion/getTwoDimension" alt="" /></div>

<p>二維碼圖片2:</p>
<img src="/downloadIOSAPPQRCode"/><a href="/downloadIOSAPPQRCode">下載</a>

<p>二維碼圖片3:</p>
<img src="/showQrcode"/><a href="/showQrcode">下載</a>
</body>
</html>}