java生成二維碼
java生成二維碼的方式有很多，但是我選用的是 ZXing，ZXing是goole開發的，我個人感覺比較喜歡這套吧。
一、引入依賴
<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.0</version>
</dependency>
二、生成二維碼
- 操作類
package com.mcp.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.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
public class EncodeTest {
/***
* 二維碼生成類
* @param response
* @param logoImages logo圖片
* @param contents 二維碼裏的數據
* @throws IOException
* @throws WriterException
*/
public static void Encode_QR_CODE(HttpServletResponse response,String logoImages,String contents) throws IOException, WriterException{
int width = 430; // 二維碼圖片寬度 300
int height = 430; // 二維碼圖片高度300
String format = "gif";// 二維碼的圖片格式 gif
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
// 指定糾錯等級,糾錯級別（L 7%、M 15%、Q 25%、H 30%）
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
// 內容所使用字符集編碼
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
// hints.put(EncodeHintType.MAX_SIZE, 350);//設置圖片的最大值
// hints.put(EncodeHintType.MIN_SIZE, 100);//設置圖片的最小值
hints.put(EncodeHintType.MARGIN, 1);//設置二維碼邊的空度，非負數
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,//要編碼的內容
//編碼類型，目前zxing支持：Aztec 2D,CODABAR 1D format,Code 39 1D,Code 93 1D ,Code 128 1D,
//Data Matrix 2D , EAN-8 1D,EAN-13 1D,ITF (Interleaved Two of Five) 1D,
//MaxiCode 2D barcode,PDF417,QR Code 2D,RSS 14,RSS EXPANDED,UPC-A 1D,UPC-E 1D,UPC/EAN extension,UPC_EAN_EXTENSION
BarcodeFormat.QR_CODE,
width, //條形碼的寬度
height, //條形碼的高度
hints);//生成條形碼時的一些配置,此項可選
//獲取輸出流
OutputStream fos = response.getOutputStream();
BufferedImage Bimage = MatrixToImageWriter.toBufferedImage(bitMatrix);
MatrixToImageWriter.writeToStream(bitMatrix,format,fos,logoImages);
if (!ImageIO.write(Bimage, "png", fos)) {
throw new IOException("Could not write an image ");
}
fos.close();
}
}
LogoConfig類，主要處理logo圖標已達到和微信自動的二維碼相近的效果
package com.mcp.qrcode;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
/**
* 二維碼 添加 logo圖標 處理的方法,
* 模仿微信自動生成二維碼效果，有圓角邊框，logo和二維碼間有空白區，logo帶有灰色邊框
* @author Administrator sangwenhao
*
*/
public class LogoConfig {
/**
* 設置 logo
* @param matrixImage 源二維碼圖片
* @param logoImage logo圖片
* @return 返回帶有logo的二維碼圖片
* @throws IOException
* @author Administrator sangwenhao
*/
public BufferedImage LogoMatrix(BufferedImage matrixImage,String logoImage) throws IOException{
/**
* 讀取二維碼圖片，並構建繪圖對象
*/
Graphics2D g2 = matrixImage.createGraphics();
int matrixWidth = matrixImage.getWidth();
int matrixHeigh = matrixImage.getHeight();
/**
* logo圖片在本地獲取
*/
// BufferedImage logo = ImageIO.read(new File(logoImage));
// logo圖片在遠程獲取
URL url = new URL(logoImage);
BufferedImage logo = ImageIO.read(url);
//開始繪製圖片
g2.drawImage(logo,matrixWidth/5*2,matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5, null);//繪製
BasicStroke stroke = new BasicStroke(5,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
g2.setStroke(stroke);// 設置筆畫對象
//指定弧度的圓角矩形
RoundRectangle2D.Float round = new RoundRectangle2D.Float(matrixWidth/5*2, matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5,20,20);
g2.setColor(Color.white);
g2.draw(round);// 繪製圓弧矩形
//設置logo 有一道灰色邊框
BasicStroke stroke2 = new BasicStroke(1,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
g2.setStroke(stroke2);// 設置筆畫對象
RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(matrixWidth/5*2+2, matrixHeigh/5*2+2, matrixWidth/5-4, matrixHeigh/5-4,20,20);
g2.setColor(new Color(128,128,128));
g2.draw(round2);// 繪製圓弧矩形
g2.dispose();
matrixImage.flush() ;
return matrixImage ;
}
}
- 維碼的生成需要藉助
MatrixToImageWriter類
package com.mcp.qrcode;
import com.google.zxing.common.BitMatrix;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
/**
* 二維碼的生成需要藉助MatrixToImageWriter類
* 生產條形碼的基類
*/
public class MatrixToImageWriter {
private static final int BLACK = 0xFF000000;//用於設置圖案的顏色
private static final int WHITE = 0xFFFFFFFF; //用於背景色
private MatrixToImageWriter() {
}
public static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
// 設置二維碼背景色
image.setRGB(x, y, (matrix.get(x, y) ? BLACK : WHITE));
// image.setRGB(x, y, (matrix.get(x, y) ? Color.YELLOW.getRGB() : Color.CYAN.getRGB()));
}
}
return image;
}
public static void writeToStream(BitMatrix matrix, String format, OutputStream stream,String logoImages) throws IOException {
BufferedImage image = toBufferedImage(matrix);
//設置logo圖標
LogoConfig logoConfig = new LogoConfig();
image = logoConfig.LogoMatrix(image,logoImages);
if (!ImageIO.write(image, format, stream)) {
throw new IOException("Could not write an image of format " + format);
}
}
}
- 測試
@GetMapping("/b")
public void b(HttpServletResponse response) throws IOException, WriterException {
// logo背景圖
String logoImages = "https://avatar.csdnimg.cn/1/0/8/1_qq_41853447_1568005473.jpg" ;
//二維碼中的數據
String content = "https://blog.csdn.net/qq_41853447;
EncodeTest.Encode_QR_CODE(response,logoImages,content);
}