生成二維碼，返回檔案位元組碼，或將檔案轉成base64返回
@PostMapping("/admin/get/qrcode")
public ResponseEntity<byte[]> getQrcode(Long id,boolean needlogo) throws IOException, FrameworkException{
File file = themeService.getQrCode(id,needlogo);
InputStream qrcode = new FileInputStream(file);
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = qrcode.read(buffer);
while (len >= 0) {
out.write(buffer, 0, len);
len = qrcode.read(buffer);
}
qrcode.close();
HttpHeaders headers = new HttpHeaders();
headers.set(HttpHeaders.CONTENT_TYPE, MediaType.IMAGE_JPEG_VALUE);
return new ResponseEntity<byte[]>(out.toByteArray(), headers, HttpStatus.OK);
}
private String imageToBase64(File file) throws IOException {
InputStream in = new FileInputStream(file);
byte[] data = new byte[in.available()];
in.read(data);
in.close();
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);
}
以下為封裝的二維碼圖片生成工具類
引入pom
<!-- qrCode 二維碼 -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.3</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.3</version>
</dependency>
package com.chehaha.theme;
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.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
import javax.imageio.ImageIO;
import com.chehaha.common.util.file.FileUtil;
import com.chehaha.common.util.string.StringUtil;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
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;
public class QRCodeUtil {
private static final String CHARSET = "UTF-8";
private static final String FORMAT_NAME = "JPG";
// 二維碼尺寸
private static final int QRCODE_SIZE = 200;
// LOGO寬度
private static final int WIDTH = 60;
// LOGO高度
private static final int HEIGHT = 60;
/**
* user: Rex date: 2016年12月29日 上午12:31:29
*
* @param content
* 二維碼內容
* @param logoImgPath
* Logo
* @param needCompress
* 是否壓縮Logo
* @return 返回二維碼圖片
* @throws WriterException
* @throws IOException
* BufferedImage TODO 建立二維碼圖片
*/
private static BufferedImage createImage(String content, String logoImgPath, boolean needCompress)
throws WriterException, IOException {
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 (logoImgPath == null || "".equals(logoImgPath)) {
return image;
}
// 插入圖片
QRCodeUtil.insertImage(image, logoImgPath, needCompress);
return image;
}
/**
* user: Rex date: 2016年12月29日 上午12:30:09
*
* @param source
* 二維碼圖片
* @param logoImgPath
* Logo
* @param needCompress
* 是否壓縮Logo
* @throws IOException
* void TODO 新增Logo
*/
private static void insertImage(BufferedImage source, String logoImgPath, boolean needCompress) throws IOException {
File file = new File(logoImgPath);
if (!file.exists()) {
return;
}
Image src = ImageIO.read(new File(logoImgPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 壓縮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); // 繪製縮小後的圖
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();
}
/**
* user: Rex date: 2016年12月29日 上午12:32:32
*
* @param content
* 二維碼內容
* @param logoImgPath
* Logo
* @param destPath
* 二維碼輸出路徑
* @param needCompress
* 是否壓縮Logo
* @throws IOException
* @throws WriterException
* @throws Exception
* void TODO 生成帶Logo的二維碼
*/
public static void encode(String content, String logoImgPath, String destPath, boolean needCompress)
throws IOException, WriterException {
BufferedImage image = QRCodeUtil.createImage(content, logoImgPath, needCompress);
mkdirs(destPath);
ImageIO.write(image, FORMAT_NAME, new File(destPath));
}
public static void mkdirs(String dir) {
if (StringUtil.isEmpty(dir)) {
return;
}
File file = new File(dir);
if (file.isDirectory()) {
return;
} else {
file.mkdirs();
}
}
/**
* user: Rex date: 2016年12月29日 上午12:35:44
*
* @param content
* 二維碼內容
* @param destPath
* 二維碼輸出路徑
* @throws WriterException
* @throws IOException
* @throws Exception
* void TODO 生成不帶Logo的二維碼
*/
public static void encode(String content, String destPath) throws IOException, WriterException {
QRCodeUtil.encode(content, null, destPath, false);
}
/**
* user: Rex date: 2016年12月29日 上午12:36:58
*
* @param content
* 二維碼內容
* @param logoImgPath
* Logo
* @param output
* 輸出流
* @param needCompress
* 是否壓縮Logo
* @throws IOException
* @throws WriterException
* @throws Exception
* void TODO 生成帶Logo的二維碼，並輸出到指定的輸出流
*/
public static void encode(String content, String logoImgPath, OutputStream output, boolean needCompress)
throws WriterException, IOException {
BufferedImage image = QRCodeUtil.createImage(content, logoImgPath, needCompress);
ImageIO.write(image, FORMAT_NAME, output);
}
/**
* user: Rex date: 2016年12月29日 上午12:38:02
*
* @param content
* 二維碼內容
* @param output
* 輸出流
* @throws IOException
* @throws WriterException
* @throws Exception
* void TODO 生成不帶Logo的二維碼，並輸出到指定的輸出流
*/
public static void encode(String content, OutputStream output) throws WriterException, IOException {
QRCodeUtil.encode(content, null, output, false);
}
/**
* user: Rex date: 2016年12月29日 上午12:39:10
*
* @param file
* 二維碼
* @return 返回解析得到的二維碼內容
* @throws IOException
* @throws NotFoundException
* @throws Exception
* String TODO 二維碼解析
*/
public static String decode(File file) throws IOException, NotFoundException {
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;
}
/**
* user: Rex date: 2016年12月29日 上午12:39:48
*
* @param path
* 二維碼儲存位置
* @return 返回解析得到的二維碼內容
* @throws IOException
* @throws NotFoundException
* @throws Exception
* String TODO 二維碼解析
*/
public static String decode(String path) throws NotFoundException, IOException {
return QRCodeUtil.decode(new File(path));
}
public static void main(String[] args) throws Exception {
String logo = "E:\\work\\web\\img\\logo-o.png";
String content = "https://clic.chehaha.net/agent/share?inc=95BBE820FE11D34BC5298720930D94F5";
String file = "C:\\Users\\James.Wong\\Desktop\\my-qrcode.png";
// OutputStream os = new FileOutputStream(file);
QRCodeUtil.encode(content, logo, file, true);
}
}