二維碼很常見,簡單的二維碼生成

pom中導入兩個包

<!--二維碼--><dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.3.0</version></dependency><!--file轉為MultipartFile--><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.4</version></dependency>

java工具類直接用

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.*; import java.util.Hashtable; import javax.imageio.ImageIO; 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.Result; import com.google.zxing.common.BitMatrix; import com.google.zxing.common.HybridBinarizer; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.springframework.web.multipart.MultipartFile; import org.apache.commons.fileupload.FileItem; import org.springframework.web.multipart.commons.CommonsMultipartFile;public class QRCodeUtil {private static final String CHARSET = "utf-8";public static final String FORMAT_NAME = "JPG";public static final String CONTENT_TYPE = "image/jpeg";public static final String DESTPATH = "E:/下載/"; //本地測試路徑public static final String CODE = ".jpg"; //后綴public static final String FileName = "QR"; //文件名public static final String LOAD_PATH = DESTPATH+FileName+CODE; //基本默認路徑public static final String IMGPATH = "C:/Users/46145/Pictures/a/me.jpg"; //本地測試路徑// 二維碼尺寸private static final int QRCODE_SIZE = 1200;// LOGO寬度private static final int WIDTH = 300;// LOGO高度private static final int HEIGHT = 300;/*** 生出二維碼*/public 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;}// 插入圖片QRCodeUtil.insertImage(image, imgPath, needCompress);return image;}/*** 生成中間logo*/public static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {File file = new File(imgPath);if (!file.exists()) {System.err.println("" + imgPath + " 該文件不存在！");return;}Image src = ImageIO.read(new File(imgPath));int width = src.getWidth(null);int height = src.getHeight(null);if (needCompress) { // 壓縮LOGOif (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); // 繪制縮小后的圖g.dispose();src = image;}// 插入LOGOGraphics2D 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();}/*** 讀取圖片*/public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);if(destPath==null||destPath.isEmpty()){destPath=QRCodeUtil.DESTPATH+QRCodeUtil.FileName+QRCodeUtil.CODE;}mkdirs(destPath);// String file = new Random().nextInt(99999999)+".jpg";// ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));ImageIO.write(image, FORMAT_NAME, new File(destPath));}/*** 生成圖片流*/public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);return image;}/*** 生成文件*/public static void mkdirs(String destPath) {File file = new File(destPath);// 當文件夾不存在時，mkdirs會自動創建多層目錄，區別于mkdir．(mkdir如果父目錄不存在則會拋出異常)if (!file.exists() && !file.isDirectory()) {file.mkdirs();}}/*** 讀取圖片帶文件路徑*/public static void encode(String content, String imgPath, String destPath) throws Exception {QRCodeUtil.encode(content, imgPath, destPath, false);}/*** 讀取圖片不帶文件路徑*/public static void encode(String content, String destPath) throws Exception {QRCodeUtil.encode(content, null, destPath, false);}/*** 讀取文件是否自適應logo*/public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)throws Exception {BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);ImageIO.write(image, FORMAT_NAME, output);}/*** 讀取文件輸出流*/public static void encode(String content, OutputStream output) throws Exception {QRCodeUtil.encode(content, null, output, false);}/*** 文件內容*/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 hints = new Hashtable();hints.put(DecodeHintType.CHARACTER_SET, CHARSET);result = new MultiFormatReader().decode(bitmap, hints);String resultStr = result.getText();return resultStr;}/*** 是否存在文件內容*/public static String decode(String path) throws Exception {if(path==null||path.isEmpty()){path=QRCodeUtil.DESTPATH+QRCodeUtil.FileName+QRCodeUtil.CODE;}return QRCodeUtil.decode(new File(path));}/*** 生成圖片并放到指定文件路徑*/public static int insertQR(String text,String destPath,String imgPath){int cg=0;try{//生成二維碼QRCodeUtil.encode(text, imgPath, destPath, true);// 解析二維碼String str = QRCodeUtil.decode(destPath);cg=1;}catch (Exception e){e.printStackTrace();cg=-1;}return cg;}/*** file轉為MultipartFile*/public static MultipartFile FileToMultipartFile(File file){MultipartFile multipartFile=null;try{FileItem item=QRCodeUtil.createFileItem(file.getPath());multipartFile=new CommonsMultipartFile(item);}catch (Exception e){multipartFile=null;e.printStackTrace();}return multipartFile;}/*** 轉換為fileItem文件*/public static FileItem createFileItem(String filePath) {File newfile=new File(filePath);FileItemFactory factory = new DiskFileItemFactory(16, null);String textFieldName = "file";FileItem item = factory.createItem(textFieldName, QRCodeUtil.CONTENT_TYPE, true, newfile.getName());int bytesRead = 0;byte[] buffer = new byte[8192];try {FileInputStream fis = new FileInputStream(newfile);OutputStream os = item.getOutputStream();while ((bytesRead = fis.read(buffer, 0, 8192)) != -1) {os.write(buffer, 0, bytesRead);}os.close();fis.close();} catch (IOException e) {e.printStackTrace();}return item;} } 與50位技術專家面對面20年技術見證，附贈技術全景圖

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