zxing 生成带有 logo 的二维码

package com.feinno.wbs.web.util;

import java.awt.BasicStroke;

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.FileOutputStream;

import java.io.IOException;

import java.util.Hashtable;

import java.util.Map;

import javax.imageio.ImageIO;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import com.feinno.xframe.util.LogUtils;

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;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

/**

• 二维码工具类

• @author yuandalong

*/

public class QrUtil {

private static final Logger log = LoggerFactory.getLogger(QrUtil.class);

/**

• 生成二维码

• @param str

• @param response

*/

public static void encode(String str,String logoPath,String eclevel,String qrcolor, HttpServletResponse response,int qrWidth,int qrHeight,int pix)

{

try{

Map hints = new Hashtable();

hints.put(EncodeHintType.CHARACTER_SET, "utf-8");//使用小写的编码，大写会出现]Q2\000026 开头内容

//ErrorCorrectionLevel.H 容错率：容错率越高,二维码的有效像素点就越多.

if (StringUtils.equals(eclevel, "M")) {

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);

}else if (StringUtils.equals(eclevel, "L")) {

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);

}else if (StringUtils.equals(eclevel, "Q")) {

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.Q);

}else if (StringUtils.equals(eclevel, "H")) {

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

}else{

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);

}

hints.put(EncodeHintType.MARGIN, 0);//margin 边框设置

BitMatrix martrix = new MultiFormatWriter().encode(str,

BarcodeFormat.QR_CODE, qrWidth, qrHeight, hints);

//二维码

int bgColor = 0xFF000000;

if (!StringUtils.isBlank(qrcolor)) {

bgColor = Integer.parseInt(qrcolor.substring(4), 16);// 转换成 int

}

BufferedImage bufferImage = new BufferedImage(martrix.getWidth(), martrix.getHeight(), BufferedImage.TYPE_INT_RGB);

for (int x = 0; x < martrix.getWidth(); x++) {

for (int y = 0; y < martrix.getHeight(); y++) {

bufferImage.setRGB(x, y, martrix.get(x, y) ? bgColor : 0xFFFFFFFF);//填充，可设置颜色 颜色的取值为后 6 位

}

}

if (!StringUtils.isEmpty(logoPath)) {

File file = new File(logoPath);

if (file.exists()) {

int width = (int) (qrWidth / pix);

int height = (int)(qrHeight / pix);

Image thumb = generatThumbnails(file, null, width, height, true);

if (thumb != null) {

//插入 logo

Graphics2D graph = bufferImage.createGraphics();

int w = thumb.getWidth(null);

int h = thumb.getHeight(null);

int x = (qrWidth - thumb.getWidth(null)) / 2; //设置 logo 的插入位置

int y = (qrHeight - thumb.getHeight(null)) / 2;

graph.drawImage(thumb, x, y, w, h, null);

Shape shape = new RoundRectangle2D.Float(x, y, w, h, 16, 16); // 后面两个参数是设置周边圆角，数值越大圆角越大

graph.setStroke(new BasicStroke(3f));

graph.draw(shape);

graph.dispose();

}

}

}

ImageIO.write(bufferImage, "jpg", response.getOutputStream());

}catch(Exception e){

log.error(LogUtils.getExceptionTrace(e));

}

}

/**

• 生成 logo 缩略图

• @param file 输入的文件流

• @param outputPath 输出路径

• @param width 缩略图宽

• @param height 缩略图高

• @param proportion 是否等比例缩放

*/

private static Image generatThumbnails(File file, String outputPath, int width, int height, boolean proportion)

{

log.info("缩略图宽：{}, 高：{}", new Object[]{width, height});

try {

BufferedImage img = ImageIO.read(file);

if (img.getWidth(null) == -1) {

log.info("图片无法读取！");

return null;

}

if (width <=0 || height <= 0) {

log.info("新生成的缩略图宽高不得小于 0！");

return null;

}

int newWidth;

int newHeight;

if (proportion) {

//等比例压缩

double rate1 = ((double)img.getWidth(null)) / (double)width + 0.1;

double rate2 = ((double)img.getHeight(null)) / (double)height + 0.1;

log.info("缩放比例 1：{}， 缩放比例 2：{}, 原生宽度：{}， 原生高度：{}", new Object[]{rate1, rate2, img.getWidth(null), img.getHeight(null)});

//按照缩放比率大的进行缩放

double rate = rate1 > rate2 ? rate1 : rate2;

newWidth = (int) (((double) img.getWidth(null)) / rate);

newHeight = (int) (((double) img.getHeight(null)) / rate);

}else{

newWidth = width; // 输出的图片宽度

newHeight = height;

}

log.info("缩略图新的宽度：{}, 新的高度：{}", new Object[]{newWidth,newHeight});

BufferedImage tag = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);

/**

• Image.SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的

• 优先级比速度高 生成的图片质量比较好 但速度慢

*/

Image thumb = img.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH);

tag.getGraphics().drawImage(thumb, 0, 0, null);

if (!StringUtils.isEmpty(outputPath)) {

FileOutputStream out = new FileOutputStream(outputPath);

// JPEGImageEncoder 可适用于其他图片类型的转换

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

encoder.encode(tag);

out.close();

}

return thumb;

} catch (IOException e) {

log.error(LogUtils.getExceptionTrace(e));

return null;

}

}

}