springmvc生成二维码
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2022-07-14 17:37:45
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编译工具：eclipse
项目：springmvc+ssm
在pom.xml中加入生成二维码的依赖包：
<!--二维码 -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.1</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.1</version>
</dependency>
controller层：
/**
* 生成车位二维码
*
* @param request
* @param response
* @throws Exception
*/
@RequestMapping("/getQRCode")
public void getQRCode(HttpServletRequest request, HttpServletResponse response, Integer cs_id)
throws Exception {
// 获取前台传入的信息，此处可操作性很大，大家可以通过自己查询数据库，或者通过判断填入其他信息
CustomSpaceVo sv = customSpaceService.selectVo(cs_id);
String content = "" +sv.toString();
Boolean needCompress = true;
// 通过调用我们的写的工具类，拿到图片流
ByteArrayOutputStream out = QRCodeUtil.encodeIO(content, Constant.IMG_PATH, needCompress);
// 定义返回参数
response.setCharacterEncoding("UTF-8");
response.setContentType("image/jpeg;charset=UTF-8");
response.setContentLength(out.size());
ServletOutputStream outputStream = response.getOutputStream();
outputStream.write(out.toByteArray());
outputStream.flush();
outputStream.close();
}
注：content里面的内容根据你个人需要进行拼装，所以service和serviceImpl层代码就不贴出来了。
常量类：（其实就是二维码中间图片的路径）
package com.st.eleventh.util;
public class Constant {
public final static String IMG_PATH = "C:\\Users\\ASUS\\Desktop\\image\\w2.jpg";
}
二维码工具类QRCodeUtil：
package com.st.eleventh.util.ewm;
import java.awt.BasicStroke;
import java.awt.Graphics;
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.ByteArrayOutputStream;
import java.io.File;
import java.util.Arrays;
import java.util.Hashtable;
import javax.imageio.ImageIO;
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;
/**
* 生成二维码工具类
* @author ASUS
*
*/
public class QRCodeUtil {
private static final String CHARSET = "utf-8";
private static final String FORMAT_NAME = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int WIDTH = 60;
// LOGO高度
private static final int HEIGHT = 60;
private static BufferedImage createImage(String content, String imgPath,
boolean needCompress) throws Exception {
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.getHeight();
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000
: 0xFFFFFFFF);
}
}
if (imgPath == null || "".equals(imgPath)) {
return image;
}
// 插入图片
QRCodeUtil.insertImage(image, imgPath, needCompress);
return image;
}
private static void insertImage(BufferedImage source, String imgPath,
boolean needCompress) throws Exception {
File file = new File(imgPath);
if (!file.exists()) {
System.err.println(""+imgPath+" 该文件不存在！");
return;
}
Image src = ImageIO.read(new File(imgPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > WIDTH) {
width = WIDTH;
}
if (height > HEIGHT) {
height = HEIGHT;
}
Image image = src.getScaledInstance(width, height,
Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
g.dispose();
src = image;
}
// 插入LOGO
Graphics2D graph = source.createGraphics();
int x = (QRCODE_SIZE - width) / 2;
int y = (QRCODE_SIZE - height) / 2;
graph.drawImage(src, x, y, width, height, null);
Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
graph.setStroke(new BasicStroke(3f));
graph.draw(shape);
graph.dispose();
}
//获取生成二维码的图片流
public static ByteArrayOutputStream encodeIO(String content,String imgPath,Boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath,
needCompress);
//创建储存图片二进制流的输出流
ByteArrayOutputStream baos = new ByteArrayOutputStream();
//将二进制数据写入ByteArrayOutputStream
ImageIO.write(image, "jpg", baos);
return baos;
}
//测试
public static void main(String[] args) throws Exception {
String text = "ifarm";
//QRCodeUtil.encode(text, "D:\\图片\\武僧2.jpg", "d:/MyWorkDoc", true);
//String decode = QRCodeUtil.decode("D:\\MyWorkDoc\\32533141.jpg");
ByteArrayOutputStream encodeIO = QRCodeUtil.encodeIO(text, "D:\\图片\\武僧2.jpg", true);
//输入数组
System.out.println(Arrays.toString(encodeIO.toByteArray()));
}
}
前端页面：
<span class="btnAll" id="ewm" lang="${result.cs_id}">【二维码】</span>
前端js:
// 监听
$(".btnAll").click(function() {
if ($(this).html() == "【二维码】") {
console.log("cs"+$(this).prop("lang"));
var img = document.getElementById("npcImg");
img.src = "getQRCode?cs_id=" + $(this).prop("lang");
$("#dlg2").window("open");
}
});
用来显示二维码：
<div id="dlg2" class="easyui-dialog" title="二维码信息"
data-options="iconCls:'icon-save',closed:true,modal:true"
style="display: none; width: 320px; height: 350px; padding: 10px; top: 30px">
<div style="float: left;">
<img src="" id="npcImg" width="300" height="300" /> <input
type="hidden" id="photo" name="photo" />
</div>
</div>效果：
我的座右铭：不会，我可以学；落后，我可以追赶；跌倒，我可以站起来；我一定行。
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