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  • Java生成二维码并用FastDFS上传到文件服务器返回图片地址

    1. maven依赖

     <dependency>
       <groupId>com.google.zxing</groupId>
       <artifactId>core</artifactId>
       <version>3.1.0</version>
    </dependency>
     <dependency>
       <groupId>commons-codec</groupId>
       <artifactId>commons-codec</artifactId>
       <version>1.9</version>
    </dependency>
    <dependency>
      <groupId>com.google.zxing</groupId>
      <artifactId>javase</artifactId>
       <version>3.2.1</version>
    </dependency>
    

    2. 生成二维码工具类

    package com.eongb0.common.utils;
    
    import com.google.zxing.*;
    import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
    import com.google.zxing.client.j2se.MatrixToImageWriter;
    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.image.BufferedImage;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.OutputStream;
    import java.util.HashMap;
    import java.util.Map;
      
    //二维码工具类(使用ZXingjar包)  
    public class QRCodeUtils {  
        // 默认宽为300  
        private Integer width = 600;  
        // 默认高为300  
        private Integer height = 600;  
        // 默认二维码图片格式  
        private String imageFormat = "png";  
        // 默认二维码字符编码  
        private String charType = "utf-8";  
        // 默认二维码的容错级别  
        
        // 容错等级 L、M、Q、H 其中 L 为最低, H 为最高  
        private ErrorCorrectionLevel corretionLevel = ErrorCorrectionLevel.M;  
        // 二维码与图片的边缘  
        private Integer margin = 0;  
        // 二维码参数  
        private Map<EncodeHintType, Object> encodeHits = new HashMap<EncodeHintType, Object>();  
      
    
        public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType,  
                ErrorCorrectionLevel corretionLevel, Integer margin) {  
            if (width != null) {  
                this.width = width;  
            }  
            if (height != null) {  
                this.height = height;  
            }  
            if (imageFormat != null) {  
                this.imageFormat = imageFormat;  
            }  
            if (charType != null) {  
                this.charType = charType;  
            }  
            if (corretionLevel != null) {  
                this.corretionLevel = corretionLevel;  
            }  
            if (margin != null) {  
                this.margin = margin;  
            }  
        }  
      
        public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType,  
                ErrorCorrectionLevel corretionLevel) {  
            this(width, height, imageFormat, charType, corretionLevel, null);  
        }  
      
        public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType, Integer margin) {  
            this(width, height, imageFormat, charType, null, margin);  
        }  
      
        public QRCodeUtils(Integer width, Integer height, String imageFormat, String charType) {  
            this(width, height, imageFormat, charType, null, null);  
        }  
      
        public QRCodeUtils(Integer width, Integer height, String imageFormat) {  
            this(width, height, imageFormat, null, null, null);  
        }  
      
        public QRCodeUtils(Integer width, Integer height) {  
            this(width, height, null, null, null, null);  
        }  
      
        public QRCodeUtils() {  
        }  
      
        // 初始化二维码的参数  
        private void initialParamers() {  
            // 字符编码  
            encodeHits.put(EncodeHintType.CHARACTER_SET, this.charType);  
            // 容错等级 L、M、Q、H 其中 L 为最低, H 为最高  
            encodeHits.put(EncodeHintType.ERROR_CORRECTION, this.corretionLevel);  
            // 二维码与图片边距  
            encodeHits.put(EncodeHintType.MARGIN, margin);  
        }  
      
        // 得到二维码图片  
        public BufferedImage getBufferedImage(String content) {  
            initialParamers();  
            BufferedImage bufferedImage = null;  
            try {  
                BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width,  
                        this.height, this.encodeHits);  
                
                
                //去掉白边
                int[] rec = bitMatrix.getEnclosingRectangle();  
                int resWidth = rec[2] + 1;  
                int resHeight = rec[3] + 1;  
                BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);  
                resMatrix.clear();  
                for (int i = 0; i < resWidth; i++) {  
                    for (int j = 0; j < resHeight; j++) {  
                        if (bitMatrix.get(i + rec[0], j + rec[1])) { 
                             resMatrix.set(i, j); 
                        } 
                    }  
                }  
                //2
                int width = resMatrix.getWidth();
                int height = resMatrix.getHeight();
                bufferedImage = new BufferedImage(width, height,BufferedImage.TYPE_INT_ARGB);
                for (int x = 0; x < width; x++) {
                    for (int y = 0; y < height; y++) {
                    	bufferedImage.setRGB(x, y, resMatrix.get(x, y) == true ? 
                        Color.BLACK.getRGB():Color.WHITE.getRGB());
                    }
                }
            } catch (WriterException e) {
                e.printStackTrace();  
                return null;  
            }  
            return bufferedImage;  
        }  
      
        // 将二维码保存到输出流中  
        public void writeToStream(String content, OutputStream os) {  
            initialParamers();  
            try {  
                BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,  
                        this.encodeHits);  
                MatrixToImageWriter.writeToStream(matrix, this.imageFormat, os);  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
      
        // 将二维码图片保存为文件  
        public void createQrImage(String content, File file) {  
            initialParamers();  
            try {  
                BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,this.encodeHits);  
                MatrixToImageWriter.writeToFile(matrix, this.imageFormat, file);  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
      
        // 将二维码图片保存到指定路径  
        public void createQrImage(String content, String path) {  
            initialParamers();  
            try {  
                BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,this.encodeHits);  
                MatrixToImageWriter.writeToPath(matrix, this.imageFormat, new File(path).toPath());  
                //MatrixToImageWriter.
                
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
        
        
        public void newcreateQrImage(String content, String path) {  
            initialParamers();  
            try {  
                BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, this.width, this.height,this.encodeHits);  
               // MatrixToImageWriter.writeToPath(matrix, this.imageFormat, new File(path).toPath());  
                //MatrixToImageWriter.w
                
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }   
        
          
        //识别图片二维码  
        public String decodeQrImage(File file){  
            String content=null;  
            try {  
                BufferedImage bufferedImage=ImageIO.read(new FileInputStream(file));  
                LuminanceSource source=new BufferedImageLuminanceSource(bufferedImage);  
                Binarizer binarizer=new HybridBinarizer(source);  
                BinaryBitmap image=new BinaryBitmap(binarizer);  
                Map<DecodeHintType,Object> decodeHits=new HashMap<DecodeHintType, Object>();  
                decodeHits.put(DecodeHintType.CHARACTER_SET, this.charType);  
                Result result=new MultiFormatReader().decode(image, decodeHits);  
                content=result.getText();  
            }catch (Exception e) {  
                e.printStackTrace();  
            }  
            return content;  
        }  
          
        public Integer getWidth() {  
            return width;  
        }  
      
        public void setWidth(Integer width) {  
            this.width = width;  
        }  
      
        public Integer getHeight() {  
            return height;  
        }  
      
        public void setHeight(Integer height) {  
            this.height = height;  
        }  
      
        public String getImageFormat() {  
            return imageFormat;  
        }  
      
        public void setImageFormat(String imageFormat) {  
            this.imageFormat = imageFormat;  
        }  
      
        public String getCharType() {  
            return charType;  
        }  
      
        public void setCharType(String charType) {  
            this.charType = charType;  
        }  
      
        public ErrorCorrectionLevel getCorretionLevel() {  
            return corretionLevel;  
        }  
      
        public void setCorretionLevel(ErrorCorrectionLevel corretionLevel) {  
            this.corretionLevel = corretionLevel;  
        }  
      
        public Integer getMargin() {  
            return margin;  
        }  
      
        public void setMargin(Integer margin) {  
            this.margin = margin;  
        }  
      
        public Map<EncodeHintType, Object> getHits() {  
            return encodeHits;  
        }  
      
        public void setHits(Map<EncodeHintType, Object> hits) {  
            this.encodeHits = hits;  
        }  
      
    }  
    

    3.  将生成的二维码上传到FastDFS接口

       @ApiOperation("获取二维码URL")
        @GetMapping("getCodeUrl")
        public Result packageUrlForLink(@LoginUser(isFull = true) SysUser user){
            String link="";
            QRCodeUtils qrCode=new QRCodeUtils(100,100);
            qrCode.setMargin(1);
            String deptId = user.getDeptId();
            SysDept dept = userService.findDeptById(deptId);
            String content = "部门名称:"+dept.getDeptName()+"
    打印人:"+user.getUsername() + "
    打印时间:" + GTime.getLogTime();
            BufferedImage image=qrCode.getBufferedImage(content);
            try {
                //以流的方式将图片上传到fastdfs上:
                ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
                ImageIO.write(image, "png", outputStream);
                InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
           // 调用FastDFS中的接口将数据流保存到服务器返回图片地址 StorePath storePath = storageClient.uploadImageAndCrtThumbImage(inputStream,inputStream.available(),"png",null); link = "http://" + fileServerProperties.getFdfs().getWebUrl() + "/" + storePath.getFullPath(); }catch (IOException ex){ ex.printStackTrace(); } Map<String,Object> model = new HashMap<>(); model.put("imgStr",link); return Result.succeed(model); }

    4. FastDFS配置文件 要对缩略图的大小进行设置

    fdfs:
      soTimeout: 1500
      connectTimeout: 1000
      tracker-list: ip:端口
      thumb-image:
         100
        height: 100
    

      

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  • 原文地址:https://www.cnblogs.com/petrolero/p/12539763.html
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