java在底图上生成二维码以及文字
java在底图上生成二维码以及文字
1.添加依赖
<dependency>
<groupId>cn.hutoolgroupId>
<artifactId>hutool-extraartifactId>
<version>5.4.3version>
dependency>
<dependency>
<groupId>com.google.zxinggroupId>
<artifactId>coreartifactId>
<version>3.3.3version>
dependency>
2.工具类
package com.sunente.framework.qrcode;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.sunente.framework.assets.deviceAsset.bean.Device;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
/**
* @Description: 在图片上生成二维码并且在图片上添加文字response前端
*/
public class QRcodeImageFont {
// 默认宽为300
private static Integer width = 120;
// 默认高为300
private static Integer height = 120;
// 默认二维码图片格式
private static String imageFormat = "png";
// 默认二维码字符编码
private static String charType = "utf-8";
// 容错等级 L、M、Q、H 其中 L 为最低, H 为最高
private static ErrorCorrectionLevel corretionLevel = ErrorCorrectionLevel.M;
// 二维码与图片的边缘
private static Integer margin = 0;
// 二维码参数
private static Map<EncodeHintType, Object> encodeHits = new HashMap<EncodeHintType, Object>();
// 初始化二维码的参数
private static void initialParams() {
// 字符编码
encodeHits.put(EncodeHintType.CHARACTER_SET, charType);
// 容错等级 L、M、Q、H 其中 L 为最低, H 为最高
encodeHits.put(EncodeHintType.ERROR_CORRECTION, corretionLevel);
// 二维码与图片边距 就是白边有多宽
encodeHits.put(EncodeHintType.MARGIN, margin);
}
/***
* 在一张背景图上添加二维码
*/
public static void drawString(String code, HttpServletResponse response, byte[] bytes) throws Exception {
BufferedImage image = addBaseMap(code,bytes);
Graphics2D gd = image.createGraphics();
// 5.设置对线段的锯齿状边缘处理
gd.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
// 6.设置水印文字颜色
gd.setColor(Color.black);
// 7.设置水印文字Font
gd.setFont(new Font("微软雅黑", Font.PLAIN, 13));
// 8.第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y)
gd.drawString("设备编号："+code, 140, 74);
gd.dispose();
// 9. 输出图片
ServletOutputStream outputStream = response.getOutputStream();
ImageIO.write(image, imageFormat,outputStream );
outputStream.flush();
outputStream.close();
}
/**
* 生成底图以及二维码
* @param content 要生成的二维码字符串
* @param bytes 底图的字节数组 可以通过其它形式生成 Image 对象
* @return
* @throws Exception
*/
public static BufferedImage addBaseMap(String content,byte[] bytes) throws Exception {
//1.数组转化为图片
Image srcImg = ImageIO.read(new ByteArrayInputStream(bytes));
//获取图片的宽
int srcImgWidth = srcImg.getWidth(null);
//获取图片的高
int srcImgHeight = srcImg.getHeight(null);
//2.生成底图
BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufImg.createGraphics();
g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
//3.使用工具类生成二维码
Image image = getBufferedImage(content);
//4.将小图片绘到大图片上,15,45 表示你的小图片在大图片上的位置。
g.drawImage(image, 15, 45, null);
//设置颜色。
g.setColor(Color.WHITE);
g.dispose();
return bufImg;
}
/**
* 生成二维码
* @param content
* @return
*/
public static BufferedImage getBufferedImage(String content) {
initialParams();
BufferedImage bufferedImage = null;
try {
//参数为 字符串参数 二维码格式 宽 高 二维码入参
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width,
height,encodeHits);
bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
} catch (WriterException e) {
e.printStackTrace();
return null;
}
return bufferedImage;
}
}
3.controller请求测试
@ApiOperation("根据文件名下载")
@ApiImplicitParams({
@ApiImplicitParam(name = "code", value = "code", dataType = "string", paramType = "query", required = true),
})
@GetMapping(value="/createNewQRCodeByCode")
public void createNewQRCodeByCode(HttpServletRequest request, HttpServletResponse response,String code){
try{
//因为我的照片都存在了minio所以就直接从minio获取就行了
byte[] bytes = minioTemplate.getObject("733202765131681792.png");
response.setHeader("content-disposition", "attachement;filename="+URLEncoder.encode(code, "utf-8"));
response.setContentType("application/octet-stream;charset=UTF-8");
QRcodeImageFont.drawString(code,response,bytes);
}catch(Exception e){
log.error("根据文件名下载时异常",e);
}
}
参考了博主
https://blog.csdn.net/qq_38377774/article/details/108767573?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522166392315716782390589650%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request_id=166392315716782390589650&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2allfirst_rank_ecpm_v1~rank_v31_ecpm-6-108767573-null-null.142v50control_1,201v3control_1&utm_term=java%E5%9C%A8%E5%9B%BE%E7%89%87%E4%B8%8A%E7%94%9F%E6%88%90%E4%BA%8C%E7%BB%B4%E7%A0%81%E5%9B%BE%E7%89%87&spm=1018.2226.3001.4187