最近有點時間想學點東西，想做個簡單的系統，現在登入的時候使用掃描二維碼獲取驗證碼登入，於是就有了下面的一些程式碼

首先要匯入pom依賴

 <dependency>
      <groupId>com.google.zxing</groupId>
      <artifactId>core</artifactId>
      <version>3.3.0</version>
 </dependency>

這個是goole提供的一些包

第一個類是goole提供幫主類 畫出圖片

package com.cmbchina.ccd.itpm.baffle.util;
 
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import com.google.zxing.LuminanceSource;
 
public class BufferedImageLuminanceSource extends LuminanceSource {
 
  private final BufferedImage image;
  private final int left;
  private final int top;
 
  public BufferedImageLuminanceSource(BufferedImage image) {
    this(image,image.getWidth(),image.getHeight());
  }
 
  public BufferedImageLuminanceSource(BufferedImage image,int left,int top,int width,int height) {
    super(width,height);
 
    int sourceWidth = image.getWidth();
    int sourceHeight = image.getHeight();
    if (left + width > sourceWidth || top + height > sourceHeight) {
      throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
    }
 
    for (int y = top; y < top + height; y++) {
      for (int x = left; x < left + width; x++) {
        if ((image.getRGB(x,y) & 0xFF000000) == 0) {
          image.setRGB(x,y,0xFFFFFFFF); // = white
        }
      }
    }
 
    this.image = new BufferedImage(sourceWidth,sourceHeight,BufferedImage.TYPE_BYTE_GRAY);
    this.image.getGraphics().drawImage(image,null);
    this.left = left;
    this.top = top;
  }
 
  public byte[] getRow(int y,byte[] row) {
    if (y < 0 || y >= getHeight()) {
      throw new IllegalArgumentException("Requested row is outside the image: " + y);
    }
    int width = getWidth();
    if (row == null || row.length < width) {
      row = new byte[width];
    }
    image.getRaster().getDataElements(left,top + y,width,1,row);
    return row;
  }
 
  public byte[] getMatrix() {
    int width = getWidth();
    int height = getHeight();
    int area = width * height;
    byte[] matrix = new byte[area];
    image.getRaster().getDataElements(left,top,height,matrix);
    return matrix;
  }
 
  public boolean isCropSupported() {
    return true;
  }
 
  public LuminanceSource crop(int left,int height) {
    return new BufferedImageLuminanceSource(image,this.left + left,this.top + top,height);
  }
 
  public boolean isRotateSupported() {
    return true;
  }
 
  public LuminanceSource rotateCounterClockwise() {
    int sourceWidth = image.getWidth();
    int sourceHeight = image.getHeight();
    AffineTransform transform = new AffineTransform(0.0,-1.0,1.0,0.0,sourceWidth);
    BufferedImage rotatedImage = new BufferedImage(sourceHeight,sourceWidth,BufferedImage.TYPE_BYTE_GRAY);
    Graphics2D g = rotatedImage.createGraphics();
    g.drawImage(image,transform,null);
    g.dispose();
    int width = getWidth();
    return new BufferedImageLuminanceSource(rotatedImage,sourceWidth - (left + width),getHeight(),width);
  }
 
}

生成圖片工具類

package com.cmbchina.ccd.itpm.baffle.util;

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCodeUtil {
  private static final String CHARSET = "utf-8";
  private static final String FORMAT_NAME = "JPG";
  // 二維碼尺寸
  private static final int QRCODE_SIZE = 300;
  // LOGO寬度
  private static final int WIDTH = 60;
  // LOGO高度
  private static final int HEIGHT = 60;

  private static BufferedImage createImage(String content,String imgPath,boolean needCompress) throws Exception {
    Hashtable hints = new Hashtable();
    hints.put(EncodeHintType.ERROR_CORRECTION,ErrorCorrectionLevel.H);
    hints.put(EncodeHintType.CHARACTER_SET,CHARSET);
    hints.put(EncodeHintType.MARGIN,1);
    BitMatrix bitMatrix =
        new MultiFormatWriter().encode(content,BarcodeFormat.QR_CODE,QRCODE_SIZE,hints);
    int width = bitMatrix.getWidth();
    int height = bitMatrix.getHeight();
    BufferedImage image = new BufferedImage(width,BufferedImage.TYPE_INT_RGB);
    for (int x = 0; x < width; x++) {
      for (int y = 0; y < height; y++) {
        image.setRGB(x,bitMatrix.get(x,y) ? 0xFF000000 : 0xFFFFFFFF);
      }
    }
    if (imgPath == null || "".equals(imgPath)) {
      return image;
    }
    // 插入圖片
    QRCodeUtil.insertImage(image,imgPath,needCompress);
    return image;
  }

  private static void insertImage(BufferedImage source,boolean needCompress) throws Exception {
    File file = new File(imgPath);
    if (!file.exists()) {
      System.err.println("" + imgPath + "  該檔案不存在！");
      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 > WIDTH) {
        width = WIDTH;
      }
      if (height > HEIGHT) {
        height = HEIGHT;
      }
      Image image = src.getScaledInstance(width,Image.SCALE_SMOOTH);
      BufferedImage tag = new BufferedImage(width,BufferedImage.TYPE_INT_RGB);
      Graphics g = tag.getGraphics();
      g.drawImage(image,null); // 繪製縮小後的圖
      g.dispose();
      src = image;
    }
    // 插入LOGO
    Graphics2D graph = source.createGraphics();
    int x = (QRCODE_SIZE - width) / 2;
    int y = (QRCODE_SIZE - height) / 2;
    graph.drawImage(src,x,null);
    Shape shape = new RoundRectangle2D.Float(x,6,6);
    graph.setStroke(new BasicStroke(3f));
    graph.draw(shape);
    graph.dispose();
  }

  /**
   * @param content 編碼到二維碼中的內容
   * @param imgPath 要嵌入二維碼的圖片路徑，如果不寫或者為null則生成一個沒有嵌入圖片的純淨的二維碼
   * @param destPath 生成的二維碼的存放路徑
   * @param needCompress true：表示將嵌入二維碼的圖片進行壓縮，如果為“false”則表示不壓縮
   * @param request
   * @param response 設定圖片返回前端展示
   * @throws Exception
   */
  public static void encode(String content,String destPath,boolean needCompress,HttpServletRequest request,HttpServletResponse response) throws Exception {
    BufferedImage image = QRCodeUtil.createImage(content,needCompress);
    mkdirs(destPath);
    // String file = new Random().nextInt(99999999)+".jpg";
    // ImageIO.write(image,FORMAT_NAME,new File(destPath+"/"+file));
    ImageIO.write(image,new File(destPath));
    response.setContentType("image/jpeg");
    // 設定響應頭控制瀏覽器不要快取
    response.setDateHeader("expries",-1);
    response.setHeader("Cache-Control","no-cache");
    response.setHeader("Pragma","no-cache");
    ImageIO.write(image,response.getOutputStream());
  }

  public static BufferedImage encode(String content,boolean needCompress) throws Exception {
    BufferedImage image = QRCodeUtil.createImage(content,needCompress);
    return image;
  }

  public static void mkdirs(String destPath) {
    File file = new File(destPath);
    // 當資料夾不存在時，mkdirs會自動建立多層目錄，區別於mkdir．(mkdir如果父目錄不存在則會丟擲異常)
    if (!file.exists() && !file.isDirectory()) {
      file.mkdirs();
    }
  }

  public static void encode(String content,String destPath) throws Exception {
    QRCodeUtil.encode(content,destPath,false);
  }
  // 被註釋的方法
  /*
   * public static void encode(String content,boolean
   * needCompress) throws Exception { QRCodeUtil.encode(content,null,* needCompress); }
   */

  public static void encode(String content,false);
  }

  public static void encode(String content,OutputStream output,boolean needCompress)
      throws Exception {
    BufferedImage image = QRCodeUtil.createImage(content,needCompress);
    ImageIO.write(image,output);
  }

  public static void encode(String content,new File(destPath));

  }

  public static void encode(String content,OutputStream output) throws Exception {
    QRCodeUtil.encode(content,output,false);
  }

  public static String decode(File file) throws Exception {
    BufferedImage image;
    image = ImageIO.read(file);
    if (image == null) {
      return null;
    }
    BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
    Result result;
    Hashtable hints = new Hashtable();
    hints.put(DecodeHintType.CHARACTER_SET,CHARSET);
    result = new MultiFormatReader().decode(bitmap,hints);
    String resultStr = result.getText();
    return resultStr;
  }

  public static String decode(String path) throws Exception {
    return QRCodeUtil.decode(new File(path));
  }

}

controller

package com.cmbchina.ccd.itpm.baffle.controller;

import com.cmbchina.ccd.itpm.baffle.util.QRCodeUtil;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Random;

/**
 * @Author zly
 * @Date 2020/6/24 15:54
 */
@RestController
@RequestMapping("image")
public class ImageController {
  @GetMapping("getImage")
  public void getImage(HttpServletRequest request,HttpServletResponse response) throws Exception {
    String text = "http://101.132.36.16";
    // 嵌入二維碼的圖片路徑
    String imgPath = "F:/qrCode/Koala.jpg";
    // 生成的二維碼的路徑及名稱
    String destPath = "F:/qrCode/qrcode/jam.jpg";
    //這裡可以根據業務邏輯產生二維碼內容 這裡我是使用隨機數1000-9999
    int i = (int) (Math.random() * 9000 + 1000);
    
    //生成二維碼並返回前端

    QRCodeUtil.encode("" + i,true,request,response);

  }
}

二維碼示例

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