Java生成二维码源码
第一步
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导入依赖包
com.google.zxing
core
3.1.0
com.google.zxing
javase
3.1.0
第二步,创建class文件(QRCodeUtils )
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 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.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
public class QRCodeUtils {
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 = 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, 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
QRCodeUtils.insertImage(image, imgPath, needCompress);
return image;
}
/**
插入LOGO
@param source
二维码图片
@param imgPath
LOGO图片地址
@param needCompress
是否压缩
- @throws Exception
*/
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();
}
/**
生成二维码(内嵌LOGO)
@param content
内容
@param imgPath
LOGO地址
@param destPath
存放目录
@param needCompress
是否压缩LOGO
- @throws Exception
*/
public static String encode(String content, String imgPath, String destPath,
boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtils.createImage(content, imgPath,
needCompress);
mkdirs(destPath);
String file = new Random().nextInt(99999999)+".jpg";
ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
return file;
}
/**
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)MT4部分平仓
@date 2013-12-11 上午10:16:36
- @param destPath 存放目录
*/
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();
}
}
/**
生成二维码(内嵌LOGO)
@param content
内容
@param imgPath
LOGO地址
@param destPath
存储地址
- @throws Exception
*/
public static void encode(String content, String imgPath, String destPath)
throws Exception {
QRCodeUtils.encode(content, imgPath, destPath, false);
}
/**
生成二维码
@param content
内容
@param destPath
存储地址
@param needCompress
是否压缩LOGO
- @throws Exception
*/
public static void encode(String content, String destPath,
boolean needCompress) throws Exception {
QRCodeUtils.encode(content, null, destPath, needCompress);
}
/**
生成二维码
@param content
内容
@param destPath
存储地址
- @throws Exception
*/
public static void encode(String content, String destPath) throws Exception {
QRCodeUtils.encode(content, null, destPath, false);
}
/**
生成二维码(内嵌LOGO)
@param content
内容
@param imgPath
LOGO地址
@param output
输出流
@param needCompress
是否压缩LOGO
- @throws Exception
*/
public static void encode(String content, String imgPath,
OutputStream output, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtils.createImage(content, imgPath,
needCompress);
ImageIO.write(image, FORMAT_NAME, output);
}
/**
生成二维码
@param content
内容
@param output
输出流
- @throws Exception
*/
public static void encode(String content, OutputStream output)
throws Exception {
QRCodeUtils.encode(content, null, output, false);
}
/**
解析二维码
@param file
二维码图片
@return
- @throws Exception
*/
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;
}
/**
解析二维码
@param path
二维码图片地址
@return
- @throws Exception
*/
public static String decode(String path) throws Exception {
return QRCodeUtils.decode(new File(path));
}
}
第三步,Controller层
@AuthIgnore
@GetMapping("QRCode")
public R QRCode() {
String text = "I love you"; //生成二维码的内容
String logoPath = "D:\img\1575892281966maxresdefault.jpg"; //二维码的logo图片
String destPath = "D:\img"; //生成的二维码存储本地的地址
try {
System.out.println(QRCodeUtils.encode(text, logoPath, destPath, true));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return R.ok().put("msg", "成功");
}
第四步 使用Postman访问接口
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