1、利用Java生成带logo的二维码,以及可以改变二维码的颜色。
导入连个包:javase-3.3.0.jar和core-3.3.0.jar
2、代码:
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.util.Hashtable;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* 二维码工具类
*
*/
public class QRCodeUtil {
private static final String CHARSET = "utf-8";
private static final String FORMAT = "JPG";
public static void main(String[] args) throws Exception {
String text = "http://www.baidu.com";
String finame=QRCodeUtil.encode(text, "/Users/zhangjinru/背景图/666.jpg", "/Users/zhangjinru", "qrcode", true,900,60);
System.out.println(finame);
}
/**
*
* @param content 二维码内容
* @param logoPath logo图片的路径
* @param destPath 二维码保存的文件夹
* @param fileName 二维码名字
* @param needCompress 是否压缩logo图片
* @param qrcode_size 二维码大小
* @param logo_size logo 大小
* @return 返回生成二维码的路径
* @throws Exception
*/
public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress,int qrcode_size,int logo_size) throws Exception {
BufferedImage image = createImage(content, logoPath, needCompress,qrcode_size,logo_size);
File file = new File(destPath);
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
fileName = fileName.substring(0, fileName.indexOf(".")>0?fileName.indexOf("."):fileName.length()) + "." + FORMAT.toLowerCase();
ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
return destPath+File.separator+fileName;
}
private static BufferedImage createImage(String content, String logoPath, boolean needCompress,int qrcode_size,int logo_size) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
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);//改变二维码的颜色
}
}
if (logoPath == null || "".equals(logoPath)) {
return image;
}
// 插入图片
QRCodeUtil.insertImage(image, logoPath, needCompress,qrcode_size,logo_size);
return image;
}
private static void insertImage(BufferedImage source, String logoPath, boolean needCompress,int qrcode_size,int logo_size ) throws Exception {
File file = new File(logoPath);
if (!file.exists()) {
throw new Exception("logo file not found.");
}
Image src = ImageIO.read(new File(logoPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > logo_size) {
width = logo_size;
}
if (height > logo_size) {
height = logo_size;
}
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();
}
}