今天在做热敏打印机打印二维码，并有文字描述，想到的简单的方法就是根据热敏打印机的纸张宽度和高度，生成对应的图片，如下：
package com.orisdom.utils;import lombok.extern.slf4j.Slf4j;import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;/** * @author chenxiaokang * @date 2019/7/8 13:48 */@Slf4jpublic class ImageBuilderUtils { /** * 热敏打印机纸张大约宽度（4cm*6cm） */ private static final int width = 151; /** * 热敏打印机纸张大约高度（4cm*6cm） */ private static final int height = 227; /** * * @param code 编码 * @param path 二维码存放路劲 * @return 最新图片生成路径 */ public static String ImageBuilder(String code,String path) { //得到图片缓冲区 FileInputStream fileInputStream = null; try { BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); File file = new File(path); if(!file.exists()){ throw new BusinessException("二维码存放地址有误"); } fileInputStream = new FileInputStream(file); BufferedImage image2 = ImageIO.read(fileInputStream); //得到它的绘制环境(这张图片的笔) Graphics2D g2 = (Graphics2D) bi.getGraphics(); g2.fillRect(0, 0, width, height); //设置颜色 g2.setColor(Color.WHITE); // 将图片大小设置为大约4cm*4cm 具体根据纸张大小设定 g2.drawImage(image2, 10, 85, 135, 135,null); g2.drawRect(0, 0, width - 1, height - 1); //设置字体:字体、字号、大小 g2.setFont(new Font("黑体", Font.BOLD, 26)); //设置背景颜色 g2.setColor(Color.BLACK); //向图片上写字符串 g2.drawString("东久", 15, 30); g2.setFont(new Font("黑体", Font.BOLD, 20)); g2.drawString("·", 65, 28); g2.setFont(new Font("黑体", Font.BOLD, 26)); g2.drawString("佳能", 83, 30); g2.setFont(new Font("黑体", Font.BOLD, 18)); g2.drawString("iR-ADV C3525", 15, 60); g2.setFont(new Font("黑体", Font.ITALIC, 14)); g2.drawString(code, 30, 80); // 图片上传后的路径 String savePath = "D:/a.jpg"; ImageIO.write(bi, "JPEG", new FileOutputStream(savePath)); return savePath; }catch (Exception e){ log.error("生成图片错误",e); throw new BusinessException("生成图片错误",e); }finally { if(fileInputStream != null){ try { fileInputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } }}编写测试类
package com.orisdom.utils;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;/** * @author chenxiaokang * @date 2019/7/8 15:39 */@RunWith(SpringJUnit4ClassRunner.class)@SpringBootTestpublic class ImageBuilderUtilsTest { @Test public void imageBuilder() { String path = ImageBuilderUtils.ImageBuilder("NO.1132323232","D:\\toolschenxiaokang\\qrcode_for_gh_02122d6b2ea8_258.jpg"); System.out.println(path); }}
最后生成的图片模板
