forked from luyan/epmet-cloud-lingshan
jianjun
3 years ago
3 changed files with 190 additions and 2 deletions
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package com.epmet.commons.tools.utils; |
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/** |
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* desc: |
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* |
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* @author: LiuJanJun |
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* @date: 2022/3/18 11:57 上午 |
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* @version: 1.0 |
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*/ |
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import com.google.zxing.BarcodeFormat; |
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import com.google.zxing.EncodeHintType; |
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import com.google.zxing.MultiFormatWriter; |
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import com.google.zxing.WriterException; |
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import com.google.zxing.client.j2se.MatrixToImageConfig; |
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import com.google.zxing.client.j2se.MatrixToImageWriter; |
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import com.google.zxing.common.BitMatrix; |
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import com.google.zxing.common.CharacterSetECI; |
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import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; |
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import javax.imageio.ImageIO; |
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import java.awt.*; |
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import java.awt.image.BufferedImage; |
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import java.io.ByteArrayOutputStream; |
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import java.io.File; |
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import java.io.IOException; |
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import java.util.HashMap; |
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/** |
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* Author 程鹏 |
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* Date： 2021/08/27 16:01 |
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* Description:二维码生成工具类 |
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*/ |
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public class BarcodeUtils { |
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/** |
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* 二维码颜色 默认是黑色 |
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*/ |
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private static final Color QRCOLOR = Color.black; |
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/** |
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* 背景颜色 |
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*/ |
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private static final Color BGWHITE = Color.white; |
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public static final int WIDTH = 360; |
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public static final int HEIGHT = 512; |
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public static final int MARGIN = 2; |
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public static final int FONTSIZE = 20; |
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/** |
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* // 二维码生成
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* |
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* @param contents 说明 |
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* @return BufferedImage |
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* @throws Exception |
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*/ |
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public static BufferedImage drawQRImage(String pressText, String contents) throws Exception { |
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BufferedImage qRImage = null; |
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if (contents == null || "".equals(contents)) { |
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throw new Exception("content说明不能为空"); |
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} |
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// 二维码参数设置
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HashMap<EncodeHintType, Object> hints = new HashMap<>(); |
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hints.put(EncodeHintType.CHARACTER_SET, CharacterSetECI.UTF8); // 编码设置
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hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 安全等级，最高h
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hints.put(EncodeHintType.MARGIN, MARGIN); // 设置margin=0-10
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// 二维码图片的生成
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BarcodeFormat format = BarcodeFormat.QR_CODE; |
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// 创建矩阵容器
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BitMatrix matrix = null; |
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try { |
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matrix = new MultiFormatWriter().encode(contents, format, WIDTH, HEIGHT, hints); |
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} catch (WriterException e) { |
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e.printStackTrace(); |
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} |
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// 设置矩阵转为图片的参数
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MatrixToImageConfig toImageConfig = new MatrixToImageConfig(QRCOLOR.getRGB(), BGWHITE.getRGB()); |
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// 矩阵转换图像
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qRImage = MatrixToImageWriter.toBufferedImage(matrix, toImageConfig); |
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return pressText(pressText, qRImage); |
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} |
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/** |
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* @param pressText 二维码下方插入文字 |
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* @param image 需要添加文字的图片 |
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* @为图片添加文字 |
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*/ |
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private static BufferedImage pressText(String pressText, BufferedImage image) throws Exception { |
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BufferedImage outImage = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB); |
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//计算文字开始的位置
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//x开始的位置：（图片宽度-字体大小*字的个数）/2
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int startX = (WIDTH - (FONTSIZE * pressText.length())) / 2; |
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//y开始的位置：图片高度-（图片高度-图片宽度）/2
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int startY = HEIGHT - (HEIGHT - WIDTH) / 2; |
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int imageW = outImage.getWidth(); |
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int imageH = outImage.getHeight(); |
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Graphics2D g = outImage.createGraphics(); |
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g.drawImage(image, 0, 0, imageW, imageH, null); |
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g.setColor(QRCOLOR); |
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g.setFont(new Font("微软雅黑", Font.BOLD, FONTSIZE)); |
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g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); |
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g.setBackground(Color.white); |
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// 获取文字数量 按照字节展示
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int size = pressText.getBytes("GBK").length; |
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// 获取一行最多能容纳多少文字 按照文字字节展示
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int maxSize = (WIDTH / FONTSIZE - 2) * 2; |
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if (size > maxSize) { |
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int v = size % maxSize; |
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for (int a = 0; a < (size / maxSize); a++) { |
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String s = outStringByByte(pressText, maxSize); |
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g.drawString(s, (WIDTH - (FONTSIZE * (WIDTH / FONTSIZE - 2))) / 2, startY); |
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pressText = pressText.substring(s.length(), pressText.length()); |
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startY = startY + 30; |
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} |
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if (v != 0) { |
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g.drawString(pressText, (WIDTH - (FONTSIZE * v)) / 2, startY); |
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} |
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} else { |
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g.drawString(pressText, (WIDTH - ((pressText.getBytes("GBK").length) / 2) * FONTSIZE) / 2, startY); |
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} |
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g.dispose(); |
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return outImage; |
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} |
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/** |
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* 保存二维码图片到本地 |
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* |
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* @param contents |
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* @throws Exception |
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*/ |
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public static void createImg(String pressText, String contents, String filename, String filePath) throws Exception { |
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BufferedImage qRImageWithLogo = drawQRImage(pressText, contents); |
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// 写入返回
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ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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ImageIO.write(qRImageWithLogo, "jpg", baos); |
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//图片类型
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String imageType = "jpg"; |
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//生成二维码存放文件
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File file = new File(filePath + filename + ".jpg"); |
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if (!file.exists()) { |
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file.mkdirs(); |
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} |
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ImageIO.write(qRImageWithLogo, imageType, file); |
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baos.close(); |
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} |
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private static String outStringByByte(String str, int len) throws IOException { |
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byte[] btf = str.getBytes("gbk"); |
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int count = 0; |
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for (int j = len - 1; j >= 0; j--) { |
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if (btf[j] < 0) { |
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count++; |
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} else { |
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break; |
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} |
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} |
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if (count % 2 == 0) { |
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return new String(btf, 0, len, "gbk"); |
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} else { |
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return new String(btf, 0, len - 1, "gbk"); |
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} |
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} |
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} |
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