公司前端时间要有一个线下活动，即发放卡片，用户用 我们的小程序商城 扫描促销卡 进行充值 或者发放优惠券这些功能。
老规矩，不在废话，直接上表:
DROP TABLE IF EXISTS `egl_activity`;
CREATE TABLE `egl_activity` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '#活动ID',
`name` varchar(80) NOT NULL COMMENT '#活动名称',
`activity_logo` varchar(200) DEFAULT NULL COMMENT '#活动LOGO：活动二维码中间的小LOGO',
`activity_num` int(11) DEFAULT NULL COMMENT '#活动卡发放数量',
`activity_type` int(11) NOT NULL COMMENT '#活动类型：#1、充值卡 2、优惠券 3、满减 4、打折',
`favourable_price` decimal(10,2) DEFAULT NULL COMMENT '#活动卡活动充值金额、优惠金额 或 优惠比例',
`full_price` decimal(10,2) DEFAULT NULL COMMENT '#满减金额-要满足多少',
`purchase_price` decimal(10,2) DEFAULT '0.00' COMMENT '#购买活动卡的金额：#默认0',
`is_early_end` int(11) DEFAULT '0' COMMENT '#活动是否提前结束：#0-不提前结束 1-提前结束 #默认0',
`activity_start_time` datetime DEFAULT NULL COMMENT '#活动开始时间',
`activity_end_time` datetime DEFAULT NULL COMMENT '#活动结束时间',
`create_time` datetime DEFAULT NULL COMMENT '#创建时间',
`update_time` datetime DEFAULT NULL COMMENT '#更新时间',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8 COMMENT='活动';
DROP TABLE IF EXISTS `egl_activity_card`;
CREATE TABLE `egl_activity_card` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '#活动卡ID',
`card_code` varchar(64) NOT NULL COMMENT '#活动卡编码',
`activity_id` int(11) DEFAULT NULL COMMENT '#所属活动ID',
`user_id` int(11) DEFAULT NULL COMMENT '#绑定用户ID',
`is_use` int(11) DEFAULT '0' COMMENT '#是否使用：#0-未使用、1-已使用 #默认0',
`create_time` datetime DEFAULT NULL COMMENT '#创建时间',
`update_time` datetime DEFAULT NULL COMMENT '#更新时间',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=41 DEFAULT CHARSET=utf8 COMMENT='活动卡片';
业务逻辑就不在多叙述，只记录下生成卡片的代码：
import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URL;
import java.util.Hashtable;
import java.util.Random;
/**
* lee
*/
public class QRCodeUtil {
private static final String CHARSET = "utf-8";
private static final String FORMAT = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 120;
// LOGO宽度
private static final int LOGO_WIDTH = 30;
// LOGO高度
private static final int LOGO_HEIGHT = 30;
public static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
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 (logoPath == null || "".equals(logoPath)) {
return image;
}
// 插入图片
QRCodeUtil.insertImage(image, logoPath, needCompress);
return image;
}
/**
* 插入LOGO
*
* @param source
* 二维码图片
* @param logoPath
* LOGO图片地址
* @param needCompress
* 是否压缩
* @throws Exception
*/
private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception {
File file = new File(logoPath);
if (!file.exists()) {
throw new Exception("logo file not found.");
}
Image src = ImageIO.read(new File(logoPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > LOGO_WIDTH) {
width = LOGO_WIDTH;
}
if (height > LOGO_HEIGHT) {
height = LOGO_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();
}
/**
* 生成二维码(内嵌LOGO)
* 二维码文件名随机，文件名可能会有重复
*
* @param content
* 内容
* @param logoPath
* LOGO地址
* @param destPath
* 存放目录
* @param needCompress
* 是否压缩LOGO
* @throws Exception
*/
public static String encode(String content, String logoPath, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
mkdirs(destPath);
String fileName = new Random().nextInt(99999999) + "." + FORMAT.toLowerCase();
ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
return fileName;
}
/**
* 生成二维码(内嵌LOGO)
* 调用者指定二维码文件名
*
* @param content
* 内容
* @param logoPath
* LOGO地址
* @param destPath
* 存放目录
* @param fileName
* 二维码文件名
* @param needCompress
* 是否压缩LOGO
* @throws Exception
*/
public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
mkdirs(destPath);
fileName = fileName.substring(0, fileName.indexOf(".")>0?fileName.indexOf("."):fileName.length())
+ "." + FORMAT.toLowerCase();
ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
return fileName;
}
/**
* 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．
* (mkdir如果父目录不存在则会抛出异常)
* @param destPath
* 存放目录
*/
public static void mkdirs(String destPath) {
File file = new File(destPath);
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
}
/**
* 生成二维码(内嵌LOGO)
*
* @param content
* 内容
* @param logoPath
* LOGO地址
* @param destPath
* 存储地址
* @throws Exception
*/
public static String encode(String content, String logoPath, String destPath) throws Exception {
return QRCodeUtil.encode(content, logoPath, destPath, false);
}
/**
* 生成二维码
*
* @param content
* 内容
* @param destPath
* 存储地址
* @param needCompress
* 是否压缩LOGO
* @throws Exception
*/
public static String encode(String content, String destPath, boolean needCompress) throws Exception {
return QRCodeUtil.encode(content, null, destPath, needCompress);
}
/**
* 生成二维码
*
* @param content
* 内容
* @param destPath
* 存储地址
* @throws Exception
*/
public static String encode(String content, String destPath) throws Exception {
return QRCodeUtil.encode(content, null, destPath, false);
}
/**
* 生成二维码(内嵌LOGO)
*
* @param content
* 内容
* @param logoPath
* LOGO地址
* @param output
* 输出流
* @param needCompress
* 是否压缩LOGO
* @throws Exception
*/
public static void encode(String content, String logoPath, OutputStream output, boolean needCompress)throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
ImageIO.write(image, FORMAT, output);
}
/**
* 生成二维码
*
* @param content
* 内容
* @param output
* 输出流
* @throws Exception
*/
public static void encode(String content, OutputStream output) throws Exception {
QRCodeUtil.encode(content, null, output, false);
}
/**
* 解析二维码
*
* @param file
* 二维码图片
* @return
* @throws Exception
*/
public static String decode(File file) throws Exception {
BufferedImage image;
image = ImageIO.read(file);
if (image == null) {
return null;
}
BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result;
Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
result = new MultiFormatReader().decode(bitmap, hints);
String resultStr = result.getText();
return resultStr;
}
/**
* 解析二维码
*
* @param path
* 二维码图片地址
* @return
* @throws Exception
*/
public static String decode(String path) throws Exception {
return QRCodeUtil.decode(new File(path));
}
public static void main(String[] args) throws Exception {
String text = "http://www.baidu.com";
//不含Logo
//QRCodeUtil.encode(text, null, "e:\\", true);
//含Logo，不指定二维码图片名
//QRCodeUtil.encode(text, "e:\\csdn.jpg", "e:\\", true);
//含Logo，指定二维码图片名
//QRCodeUtil.encode(text, "e:\\1.jpg", "e:\\", "qrcode", true);
BufferedImage image = QRCodeUtil.createImage(text, "C:\\Users\\Administrator\\Desktop\\logo.jpg", true);
FileOutputStream out = new FileOutputStream(new File("e:\\e.jpg"));
ImageIO.write(image,"jpg",out);
}
}
批量导出图片
public void export(@RequestParam Map<String, Object> params, HttpServletResponse response) throws Exception {
//设置response
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition","attachment;filename="+new String("activityCard.zip".getBytes("gbk"),"iso-8859-1"));
List<ActivityCardEntity> activityCardEntitieList = activityCardService.queryList(params);
if(activityCardEntitieList!=null && activityCardEntitieList.size()>0){
ActivityEntity activityEntity = activityService.queryObject(activityCardEntitieList.get(0).getActivityId());
//设置压缩流：直接写入response，实现边压缩边下载
ZipOutputStream zipos = null;
try {
zipos = new ZipOutputStream(new BufferedOutputStream(response.getOutputStream()));
zipos.setMethod(ZipOutputStream.DEFLATED); //设置压缩方法
} catch (Exception e) {
e.printStackTrace();
}
OutputStream outputStream = null;
for(ActivityCardEntity entity : activityCardEntitieList){
BufferedImage qrcodeImg = QRCodeUtil.createImage(entity.getCardCode(), this.getClass().getResource("/logo.jpg").getPath(), true);
BufferedImage backImg = ImageIO.read(this.getClass().getResource("/background.jpg"));
Graphics2D g = backImg.createGraphics();
// 在图形和图像中实现混合和透明效果
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.9f));
g.drawImage(qrcodeImg, 360, 330, qrcodeImg.getWidth(), qrcodeImg.getHeight(), null);
Font font = new Font("微软雅黑", Font.BOLD, 100);
Color color=new Color(32,22,30,255);
g.setColor(color);
g.setFont(font);
g.drawString(activityEntity.getFavourablePrice().setScale(0, BigDecimal.ROUND_DOWN).toString(), 750, 390);
g.dispose();
//添加ZipEntry，并ZipEntry中写入文件流
//这里，加上i是防止要下载的文件有重名的导致下载失败
zipos.putNextEntry(new ZipEntry(entity.getCardCode()+".png"));
outputStream = new DataOutputStream(zipos);
//BufferedImage 转 InputStream
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ImageOutputStream imageOutput = ImageIO.createImageOutputStream(byteArrayOutputStream);
ImageIO.write(backImg, "png", imageOutput);
InputStream inputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
long length = imageOutput.length();
//输出流
byte[] bytes = new byte[1024];
long count = 0;
while(count < length){
int len = inputStream.read(bytes, 0, 1024);
count +=len;
outputStream.write(bytes, 0, len);
}
inputStream.close();
zipos.closeEntry();
}
outputStream.close();
outputStream.flush();
zipos.close();
}
}
POM
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.1.0</version>
</dependency>效果图