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网上找到一些使用zxing包生成二维码的例子,但是发现周边的白色区域有点大,想减少一点,有写说法是设置参数hints.put(EncodeHintType.MARGIN, margin); // 指定二维码四周白色区域大小,感觉没用,不生效,四周的白色区域仍然很大。想了想,既然生成二维码的时候周边白色区域过大,那把二维码对象转为BufferedImage对象的时候,减少一点长宽,不就好了,试了下,感觉还行,生成出来的二维码也能正常用,只是周边的白色区域需要减少多少,就没法定了,需要根据生成二维码图片的width/height,自己一点点尝试。
下面的代码是网上别人的,就稍微修改了toBufferedImage的是传入要减少白色区域多少的参数。
- <dependency>
- <groupId>com.google.zxing</groupId>
- <artifactId>core</artifactId>
- <version>3.4.1</version>
- </dependency>
- package com.southgroup.psimp.util;
-
- import java.awt.BasicStroke;
- import java.awt.Color;
- import java.awt.Font;
- import java.awt.Graphics;
- import java.awt.Graphics2D;
- import java.awt.image.BufferedImage;
- import java.io.File;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.OutputStream;
- import java.util.Date;
- import java.util.Hashtable;
-
- import javax.imageio.ImageIO;
-
- import org.apache.commons.lang3.StringUtils;
-
- import com.google.zxing.BarcodeFormat;
- import com.google.zxing.EncodeHintType;
- import com.google.zxing.MultiFormatWriter;
- import com.google.zxing.WriterException;
- import com.google.zxing.common.BitMatrix;
- import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
-
- /**
- * 二维码生成
- * @author Jfei
- *
- */
- public class QrCodeUtil {
-
- private static final int BLACK = 0xFF000000;
- private static final int WHITE = 0xFFFFFFFF;
- private static final int margin = 0;
- private static final int LogoPart = 4;
-
- /**
- * 生成二维码矩阵信息
- * @param content 二维码图片内容
- * @param width 二维码图片宽度
- * @param height 二维码图片高度
- * @throws WriterException
- */
- private static BitMatrix setBitMatrix(String content, int width, int height) throws WriterException{
- Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
- hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); // 指定编码方式,防止中文乱码
- hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 指定纠错等级
- hints.put(EncodeHintType.MARGIN, margin); // 指定二维码四周白色区域大小,感觉没用,不生效,四周的白色区域仍然很大
- BitMatrix bitMatrix = null;
- bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
- return bitMatrix;
- }
-
- /**
- * 将二维码图片输出
- * @param matrix 二维码矩阵信息
- * @param format 图片格式
- * @param outStream 输出流
- * @param logoPath logo图片路径
- */
- private static void writeToFile(BitMatrix matrix, String format, OutputStream outStream, String logoPath,int reduceWhiteArea) throws IOException {
- BufferedImage image = toBufferedImage(matrix,reduceWhiteArea);
- // 加入LOGO水印效果
- if (StringUtils.isNotBlank(logoPath)) {
- image = addLogo(image, logoPath);
- }
- ImageIO.write(image, format, outStream);
- }
-
- /**
- * 生成二维码图片
- * @param matrix 二维码矩阵信息
- */
- private static BufferedImage toBufferedImage(BitMatrix matrix,int reduceWhiteArea) {
- int width = matrix.getWidth();
- int height = matrix.getHeight();
- BufferedImage image = new BufferedImage(width-2*reduceWhiteArea, height-2*reduceWhiteArea, BufferedImage.TYPE_3BYTE_BGR);
- for (int x = reduceWhiteArea; x < width-reduceWhiteArea; x++) {
- for (int y = reduceWhiteArea; y < height-reduceWhiteArea; y++) {
- image.setRGB(x-reduceWhiteArea, y-reduceWhiteArea, matrix.get(x, y) ? BLACK : WHITE);
- }
- }
- return image;
- }
-
- /**
- * 在二维码图片中添加logo图片
- * @param image 二维码图片
- * @param logoPath logo图片路径
- */
- private static BufferedImage addLogo(BufferedImage image, String logoPath) throws IOException {
- Graphics2D g = image.createGraphics();
- BufferedImage logoImage = ImageIO.read(new File(logoPath));
- // 计算logo图片大小,可适应长方形图片,根据较短边生成正方形
- int width = image.getWidth() < image.getHeight() ? image.getWidth() / LogoPart : image.getHeight() / LogoPart;
- int height = width;
- // 计算logo图片放置位置
- int x = (image.getWidth() - width) / 2;
- int y = (image.getHeight() - height) / 2;
- // 在二维码图片上绘制logo图片
- g.drawImage(logoImage, x, y, width, height, null);
- // 绘制logo边框,可选
- // g.drawRoundRect(x, y, logoImage.getWidth(), logoImage.getHeight(), 10, 10);
- g.setStroke(new BasicStroke(2)); // 画笔粗细
- g.setColor(Color.WHITE); // 边框颜色
- g.drawRect(x, y, width, height); // 矩形边框
- logoImage.flush();
- g.dispose();
- return image;
- }
-
- /**
- * 为图片添加文字
- * @param pressText 文字
- * @param newImage 带文字的图片
- * @param targetImage 需要添加文字的图片
- * @param fontStyle 字体风格
- * @param color 字体颜色
- * @param fontSize 字体大小
- * @param width 图片宽度
- * @param height 图片高度
- */
- public static void pressText(String pressText, String newImage, String targetImage, int fontStyle, Color color, int fontSize, int width, int height) {
- // 计算文字开始的位置
- // x开始的位置:(图片宽度-字体大小*字的个数)/2
- int startX = (width-(fontSize*pressText.length()))/2;
- // y开始的位置:图片高度-(图片高度-图片宽度)/2
- int startY = height-(height-width)/2 + fontSize;
- try {
- File file = new File(targetImage);
- BufferedImage src = ImageIO.read(file);
- int imageW = src.getWidth(null);
- int imageH = src.getHeight(null);
- BufferedImage image = new BufferedImage(imageW, imageH, BufferedImage.TYPE_INT_RGB);
- Graphics g = image.createGraphics();
- g.drawImage(src, 0, 0, imageW, imageH, null);
- g.setColor(color);
- g.setFont(new Font(null, fontStyle, fontSize));
- g.drawString(pressText, startX, startY);
- g.dispose();
- FileOutputStream out = new FileOutputStream(newImage);
- ImageIO.write(image, "png", out);
- out.close();
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
-
- /**
- * 生成二维码
- * @param content
- * @param width
- * @param height
- * @param logoPath logo的文件路径
- * @reduceWhiteArea 减少二维码图片周边的白色区域,默认0,可以慢慢根据width,height进行调整
- * @return
- * @throws IOException
- * @throws WriterException
- */
- public static BufferedImage createQrCode(String content,int width,int height,String logoPath,int reduceWhiteArea) throws IOException, WriterException{
- BitMatrix bitMatrix = setBitMatrix(content, width, height);
- BufferedImage image = toBufferedImage(bitMatrix,reduceWhiteArea);
- if(StringUtils.isNotBlank(logoPath)){
- // 加入LOGO水印效果
- if (StringUtils.isNotBlank(logoPath)) {
- image = addLogo(image, logoPath);
- }
- }
- return image;
- }
-
- public static void main(String[] args) throws WriterException {
- // String content = "http://www.baidu.com";
- String content = "测试二维码";
- String logoPath = null;
- String format = "jpg";
- int width = 200;
- int height = 200;
- BitMatrix bitMatrix = setBitMatrix(content, width, height);
- // 可通过输出流输出到页面,也可直接保存到文件
- OutputStream outStream = null;
- String path = "e:/qr"+new Date().getTime()+".png";
- try {
- outStream = new FileOutputStream(new File(path));
- writeToFile(bitMatrix, format, outStream, logoPath,10);
- outStream.close();
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- }
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