两种场景：
1、图片海报中加二维码
2、二维码中间加入指定图标
注意点：字体要再设置一下清晰度，要不特别模糊。
graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB);
/**
* @description 二维码控制器
*/
@RestController
public class QrcodeController {
@Autowired
ResourceLoader resourceLoader;
/**
* todo 每个用户一张二维码，里面的信息就是邀请码或者是userid
*
* @param userid MREAM5
* @return void
* @description 生成二维码
* @Param response
**/
@GetMapping("/getQrcode")
@ResponseBody
public void getQrcode(@RequestParam("userid") String userid, HttpServletResponse response) throws Exception {
String url = "http://www.biturd.com/pages/register/register";
String inviteCode = getInviteCodeByUserId(userid);
String content = url + "?invite_code=" + inviteCode;
//
// String imgPath = "./test.jpg";
Resource resource = resourceLoader.getResource("classpath:test.jpg");
File imgFile = resource.getFile();
// 海报图片
BufferedImage outerImg = ImageIO.read(imgFile);
Boolean needCompress = true;
//图片海报outerImg中加二维码
ByteArrayOutputStream out = QRCodeUtil.encodeIOWith(content, outerImg, needCompress);
//二维码中间加图片
ByteArrayOutputStream out2 = QRCodeUtil.encodeIO(content, imgFile.getPath(), needCompress);
//返回二维码
response.setCharacterEncoding("UTF-8");
response.setContentType("image/jpeg;charset=UTF-8");
response.setContentLength(out.size());
ServletOutputStream outputStream = response.getOutputStream();
outputStream.write(out.toByteArray());
outputStream.flush();
outputStream.close();
}
private String getInviteCodeByUserId(String userid) {
return "ANGYS1";
}
}
package com.biturd.manghejava.utils;
import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import sun.awt.SunHints;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
// https://uutool.cn/img-coord/
// https://blog.csdn.net/qq_38377774/article/details/108767573
// https://blog.csdn.net/weixin_39220472/article/details/120888956?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-0.pc_relevant_default&spm=1001.2101.3001.4242.1&utm_relevant_index=3
public class QRCodeUtil {
private static final String CHARSET = "utf-8";
private static final String FORMAT_NAME = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int WIDTH = 80;
// LOGO高度
private static final int HEIGHT = 80;
// LOGO宽度
private static final int LEFT = 225;
// LOGO高度
private static final int UP = 475;
// 288 535
private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
Map<EncodeHintType, Object> hints = new ConcurrentHashMap();
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, QRCODE_SIZE,
hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.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++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
if (imgPath == null || "".equals(imgPath)) {
return image;
}
// 插入图片
QRCodeUtil.insertImage(image, imgPath, needCompress);
return image;
}
private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
File file = new File(imgPath);
if (!file.exists()) {
System.err.println("" + imgPath + " 该文件不存在！");
return;
}
Image src = ImageIO.read(new File(imgPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) {
// 压缩LOGO
if (width > WIDTH) {
width = WIDTH;
}
if (height > HEIGHT) {
height = HEIGHT;
}
Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
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, y, width, height, null);
Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
graph.setStroke(new BasicStroke(3f));
graph.draw(shape);
graph.dispose();
}
public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
mkdirs(destPath);
ImageIO.write(image, FORMAT_NAME, new File(destPath));
}
public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
return image;
}
public static void mkdirs(String destPath) {
File file = new File(destPath);
// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
}
public static void encode(String content, String imgPath, String destPath) throws Exception {
QRCodeUtil.encode(content, imgPath, destPath, false);
}
public static byte[] getQRCodeImage(String content) throws WriterException, IOException {
QRCodeWriter qrCodeWriter = new QRCodeWriter();
BitMatrix bitMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE);
ByteArrayOutputStream pngOutputStream = new ByteArrayOutputStream();
MatrixToImageWriter.writeToStream(bitMatrix, FORMAT_NAME, pngOutputStream);
byte[] pngData = pngOutputStream.toByteArray();
return pngData;
}
public static void encode(String content, String destPath) throws Exception {
QRCodeUtil.encode(content, null, destPath, false);
}
public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
ImageIO.write(image, FORMAT_NAME, output);
}
public static void encode(String content, OutputStream output) throws Exception {
QRCodeUtil.encode(content, null, 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));
}
//二维码中间有图片
public static ByteArrayOutputStream encodeIO(String content, String imgPath, Boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath,
needCompress);
//创建储存图片二进制流的输出流
ByteArrayOutputStream baos = new ByteArrayOutputStream();
//将二进制数据写入ByteArrayOutputStream
ImageIO.write(image, "jpg", baos);
return baos;
}
private static BufferedImage createFromImage(String content, BufferedImage outer, boolean needCompress) throws Exception {
Map<EncodeHintType, Object> hints = new ConcurrentHashMap();
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, QRCODE_SIZE,
hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.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++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
// 插入图片
QRCodeUtil.insertFromImage(outer, image, needCompress);
return outer;
}
private static void insertFromImage(BufferedImage src,BufferedImage qrCode, boolean needCompress) throws Exception {
Image image = null;
int width = qrCode.getWidth(null);
int height = qrCode.getHeight(null);
if (needCompress) {
// 压缩LOGO
if (width > WIDTH) {
width = WIDTH;
}
if (height > HEIGHT) {
height = HEIGHT;
}
image = qrCode.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
g.dispose();
}//左上 256 500 右下 290 535
// 插入LOGO
Graphics2D graph = src.createGraphics();
graph.drawImage(image, LEFT, UP, null);
graph.setColor(Color.WHITE);
graph.dispose();
}
//
//图片中间有二维码
public static ByteArrayOutputStream encodeIOWith(String content, BufferedImage outer, Boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createFromImage(content, outer,
needCompress);
addText(image, content);
//创建储存图片二进制流的输出流
ByteArrayOutputStream baos = new ByteArrayOutputStream();
//将二进制数据写入ByteArrayOutputStream
ImageIO.write(image, "jpg", baos);
return baos;
}
public static void addText(BufferedImage image,String text){
Graphics2D graph = image.createGraphics();
// graph.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
// 5、设置水印文字颜色
graph.setColor(Color.black);
graph.setFont(new Font("宋体", Font.BOLD, 15));
// 文字增加清晰度
graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB);
graph.drawString("邀请码：", 240, 450);
graph.drawString(text, 220, 470);
graph.dispose();
}
}