废话不多说，开门见山，使用google的zxing包实现生成二维码。
下面直接贴代码：
首先pom文件导入zxing包
com.google.zxing
javase
3.3.3
接下来就是实现代码了
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
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 com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
/**
* 二维码相关
* @author Joaz
*
*/
public class QRCodeDome {
/**
* 创建二维码图片
*
* @param content 二维码携带信息
* @param qrCodeSize 二维码图片大小
* @param filePath 生成的二维码图片的保存的路径
*/
public static void createQrCodeImage(String content, int qrCodeSize, String filePath) {
try {
BufferedImage bi = createQrCode(content, qrCodeSize);
File imgFile = new File(filePath);
ImageIO.write(bi, "JPEG", imgFile);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成包含字符串信息的二维码图片
*
* @param content 二维码携带信息
* @param qrCodeSize 二维码图片大小
*/
private static BufferedImage createQrCode(String content, int qrCodeSize) {
try {
// 设置二维码纠错级别Map
Hashtable hintMap = new Hashtable<>();
// 矫错级别
hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
QRCodeWriter qrCodeWriter = new QRCodeWriter();
// 创建比特矩阵(位矩阵)的QR码编码的字符串
BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);
// 使BufferedImage勾画QRCode (matrixWidth 是行二维码像素点)
int matrixWidth = byteMatrix.getWidth();
int matrixHeight = byteMatrix.getWidth();
BufferedImage image = new BufferedImage(matrixWidth - 65, matrixWidth - 65, BufferedImage.TYPE_INT_RGB);
image.createGraphics();
Graphics2D graphics = (Graphics2D) image.getGraphics();
graphics.setColor(Color.WHITE);
graphics.fillRect(0, 0, matrixWidth, matrixHeight);
// 使用比特矩阵画并保存图像
graphics.setColor(Color.BLACK);
for (int i = 0; i < matrixWidth; i++) {
for (int j = 0; j < matrixWidth; j++) {
if (byteMatrix.get(i, j)) {
graphics.fillRect(i - 33, j - 33, 2, 2);
}
}
}
return image;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
private static final String CHARSET = "UTF-8";
/**
* 创建二维码图片
* @param contents 二维码携带信息
* @param width 宽度
* @param height 高度
* @param qrFile 二维码保存的路径
* @return
*/
public static File encode(String contents, int width, int height, File qrFile) {
//生成条形码时的一些配置
Map hints = new HashMap<>();
// 指定纠错等级,纠错级别（L 7%、M 15%、Q 25%、H 30%）
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
// 内容所使用字符集编码
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
BitMatrix bitMatrix;
try (OutputStream out = new FileOutputStream(qrFile)){
// 生成二维码
bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);
MatrixToImageWriter.writeToStream(bitMatrix, "png", out);
out.flush();
} catch (Exception e) {
e.printStackTrace();
}
return qrFile;
}
/**
* 二维码图片组合logo图片
* @param qrFile 二维码图片文件
* @param logoFile logo图片
* @param newQrFile 组合后带logo的二维码图片
* @return
*/
public static File encodeWithLogo(File qrFile, File logoFile, File newQrFile) {
//OutputStream os = null ;
try (OutputStream os = new FileOutputStream(newQrFile)){
Image image2 = ImageIO.read(qrFile) ;
int width = image2.getWidth(null) ;
int height = image2.getHeight(null) ;
BufferedImage bufferImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB) ;
//BufferedImage bufferImage =ImageIO.read(image) ;
Graphics2D g2 = bufferImage.createGraphics();
g2.drawImage(image2, 0, 0, width, height, null) ;
int matrixWidth = bufferImage.getWidth();
int matrixHeigh = bufferImage.getHeight();
//读取Logo图片
BufferedImage logo= ImageIO.read(logoFile);
//开始绘制图片
g2.drawImage(logo,matrixWidth/5*2,matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5, null);//绘制
BasicStroke stroke = new BasicStroke(10,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
g2.setStroke(stroke);// 设置笔画对象
//指定弧度的圆角矩形
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);// 绘制圆弧矩形
//设置logo 有一道灰色边框
BasicStroke stroke2 = new BasicStroke(1,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
g2.setStroke(stroke2);// 设置笔画对象
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);// 绘制圆弧矩形
g2.dispose();
bufferImage.flush() ;
//os = new FileOutputStream(newQrFile) ;
JPEGImageEncoder en = JPEGCodec.createJPEGEncoder(os) ;
en.encode(bufferImage) ;
} catch (Exception e) {
e.printStackTrace();
} /*finally {
if(os!=null) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}*/
return newQrFile ;
}
public static void main(String[] args) throws Exception {
// 需要二维码携带的内容
String content = "http://192.168.3.228:8686/demo/user/analyzeQRCode";
// 生成二维码的大小
int qrCodeSize = 400;
// 将二维码保存的路径
String filePath = "E:/img/testQRImage3.jpg";
String newFilePath = "E:/img/testQRImage4.jpg";
// 执行方法，生成二维码
//createQrCodeImage(content, qrCodeSize, filePath);
// 执行方法，生成二维码
File encode = encode(content, qrCodeSize, qrCodeSize, new File(filePath));
// 已生成的二维码组合logo
encodeWithLogo(encode,new File("C:/Users/ad/Desktop/测试2.png"),new File(newFilePath));
}
}
希望能对有需要的人有帮助，路过的点个赞吧！