qrcode二维码生成工具

本篇，笔者介绍下自己用java开发的一款QR码生成器图形化工具。 

qrcode编码、解码功能依赖于google的二维码开源库google.zxing。

笔者项目github地址: https://github.com/jellyflu/qrTool

废话少讲，先上张最终运行效果图。

整体项目结构如下(开发IDE是STS)。

具体java实现代码如下 ：

QRJFrame.java   (主窗体)

package com.tingcream.qrTool.view;
 
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
 
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.LayoutStyle.ComponentPlacement;
import javax.swing.SwingConstants;
import javax.swing.border.EmptyBorder;
import javax.swing.filechooser.FileNameExtensionFilter;
 
import org.apache.commons.io.FileUtils;
 
import com.tingcream.qrTool.qrcode.QRCodeUtil;
 
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
 
public class QRJFrame extends JFrame {
 
    /**
     *
     */
    private static final long serialVersionUID = 1L;
    private JPanel contentPane;
    private JPanel   panel1 ;//tab中面板1  面板2
     
    private JLabel label1 ;//qr码 图形显示框
    private JLabel label2;
    private JLabel lblQr;
    private JButton btn1;//panel1 生成
    private JButton btn3;//panel1 清空
     
     
    private JTextArea textArea1;//原文 文本域
     
     
    private String recentDir;//最近访问的目录
     
    private JButton btn4;// 打开img文件
    private JButton btn5;//panel1 保存
     
  
     
 
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    QRJFrame frame = new QRJFrame();
                    frame.setVisible(true);
                    frame.setLocationRelativeTo(null);//主窗体居中
                     
                      
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
 
    /**
     * Create the frame.
     * @throws IOException
     */
    public QRJFrame() throws IOException {
        setResizable(false);
        setFont(new Font("微软雅黑", Font.PLAIN, 18));
        setTitle("QR生成器");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 464, 636);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);
         
        JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
        tabbedPane.setFont(new Font("微软雅黑", Font.PLAIN, 18));
        contentPane.add(tabbedPane, BorderLayout.CENTER);
         
         panel1 = new JPanel();
        tabbedPane.addTab("QR生成", null, panel1, null);
         
         label1 = new JLabel("");
        label1.setVerticalAlignment(SwingConstants.TOP);
        label1.setBackground(Color.WHITE);
         
        setDefaultQrImg();
         
        label1.setHorizontalAlignment(SwingConstants.LEFT);
        label1.setFont(new Font("微软雅黑", Font.PLAIN, 18));
         
        label2 = new JLabel("原文内容:");
        label2.setFont(new Font("微软雅黑", Font.PLAIN, 18));
         
        JScrollPane scrollPane = new JScrollPane();
         
        lblQr = new JLabel("QR码  :");
        lblQr.setFont(new Font("微软雅黑", Font.PLAIN, 18));
         
        btn1 = new JButton("生成↓");
        btn1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                 
                generateQRImg(e);
            }
        });
        btn1.setFont(new Font("微软雅黑", Font.PLAIN, 18));
         
        btn3 = new JButton("清空");
        btn3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                textArea1.setText("");
                setDefaultQrImg();
            }
        });
        btn3.setFont(new Font("微软雅黑", Font.PLAIN, 18));
         
        btn5 = new JButton("保存");
        btn5.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                saveQrImg(e);
            }
        });
        btn5.setFont(new Font("微软雅黑", Font.PLAIN, 18));
         
        btn4 = new JButton("选择");
        btn4.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                openQrImg(e);
            }
        });
        btn4.setFont(new Font("微软雅黑", Font.PLAIN, 18));
  
        GroupLayout  gl_panel1 = new GroupLayout(panel1);
        gl_panel1.setHorizontalGroup(
            gl_panel1.createParallelGroup(Alignment.LEADING)
                .addGroup(gl_panel1.createSequentialGroup()
                    .addGroup(gl_panel1.createParallelGroup(Alignment.LEADING)
                        .addGroup(gl_panel1.createSequentialGroup()
                            .addGap(19)
                            .addGroup(gl_panel1.createParallelGroup(Alignment.TRAILING)
                                .addComponent(label2)
                                .addComponent(lblQr, GroupLayout.PREFERRED_SIZE, 76, GroupLayout.PREFERRED_SIZE)))
                        .addGroup(gl_panel1.createSequentialGroup()
                            .addContainerGap()
                            .addComponent(btn4, GroupLayout.PREFERRED_SIZE, 77, GroupLayout.PREFERRED_SIZE))
                        .addGroup(gl_panel1.createSequentialGroup()
                            .addContainerGap()
                            .addComponent(btn5, GroupLayout.PREFERRED_SIZE, 77, GroupLayout.PREFERRED_SIZE)))
                    .addPreferredGap(ComponentPlacement.RELATED)
                    .addGroup(gl_panel1.createParallelGroup(Alignment.LEADING, false)
                        .addGroup(gl_panel1.createSequentialGroup()
                            .addComponent(btn1)
                            .addPreferredGap(ComponentPlacement.RELATED)
                            .addComponent(btn3, GroupLayout.PREFERRED_SIZE, 77, GroupLayout.PREFERRED_SIZE))
                        .addComponent(label1, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(scrollPane))
                    .addContainerGap(39, Short.MAX_VALUE))
        );
        gl_panel1.setVerticalGroup(
            gl_panel1.createParallelGroup(Alignment.LEADING)
                .addGroup(gl_panel1.createSequentialGroup()
                    .addContainerGap()
                    .addGroup(gl_panel1.createParallelGroup(Alignment.LEADING)
                        .addComponent(label2)
                        .addComponent(scrollPane, GroupLayout.PREFERRED_SIZE, 152, GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(ComponentPlacement.RELATED)
                    .addGroup(gl_panel1.createParallelGroup(Alignment.BASELINE)
                        .addComponent(btn1)
                        .addComponent(btn3, GroupLayout.PREFERRED_SIZE, 33, GroupLayout.PREFERRED_SIZE))
                    .addGap(18)
                    .addGroup(gl_panel1.createParallelGroup(Alignment.LEADING)
                        .addGroup(gl_panel1.createSequentialGroup()
                            .addComponent(lblQr, GroupLayout.PREFERRED_SIZE, 24, GroupLayout.PREFERRED_SIZE)
                            .addPreferredGap(ComponentPlacement.RELATED)
                            .addComponent(btn5, GroupLayout.PREFERRED_SIZE, 33, GroupLayout.PREFERRED_SIZE)
                            .addGap(15)
                            .addComponent(btn4, GroupLayout.PREFERRED_SIZE, 33, GroupLayout.PREFERRED_SIZE))
                        .addComponent(label1))
                    .addContainerGap(21, Short.MAX_VALUE))
        );
         
         textArea1 = new JTextArea();
        textArea1.setFont(new Font("微软雅黑", Font.PLAIN, 18));
        scrollPane.setViewportView(textArea1);
        panel1.setLayout(gl_panel1);
         
    }
   
    //显示默认qr图形  空白图片
    private  void setDefaultQrImg() {
        label1.setIcon(new ImageIcon(QRJFrame.class.getResource("/com/tingcream/qrTool/img/blank_300_300.png")));
    }
     
    /**
     * 保存qr图形 到指定文件中
     * @author jelly
     * @param e
     */
      void saveQrImg(ActionEvent e) {
          String text = textArea1.getText();
             if(text==null||text.trim().equals("")) {
                 JOptionPane.showMessageDialog(null, "原文内容不能为空!");
                 return ;
             }
              
             FileOutputStream  output=null;
             try {
                 
                 JFileChooser wjsave=null;
                 if(recentDir!=null&&recentDir.trim().length()>0){
                     wjsave=new JFileChooser(recentDir);
                 }else{
                     wjsave=new JFileChooser();
                 }
               
                 wjsave.setDialogType(JFileChooser.SAVE_DIALOG);
                 wjsave.setVisible(true);
                 wjsave.setDialogTitle("保存QR码到文件");
                  
                 int value= wjsave.showSaveDialog(null);
                 if(value==JFileChooser.APPROVE_OPTION){//用户点击了保存
                      
                     File savefile= wjsave.getSelectedFile();// 保存的文件
                     recentDir= savefile.getParent();//将文件目录保存到成员变量
          
                       output=new FileOutputStream(savefile);
                       QRCodeUtil.encode(text, null, output, true);
                      
                 }
                 
            } catch (Exception e2) {
                 e2.printStackTrace();
            }finally {
                if(output!=null) {
                    try {
                        output.close();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                }
            }
         
    }
    
      /**
       * 从本地选择(打开)qr图片文件
       * @author jelly
       * @param e
       */
      void openQrImg(ActionEvent e) {
          try {
              JFileChooser wjopen=null;
             if(recentDir!=null&&recentDir.trim().length()>0){
                 wjopen=new JFileChooser(recentDir);
             }else{
                 wjopen=new JFileChooser();
             }
             wjopen.setDialogTitle("打开QR码文件");
             wjopen.setDialogType(JFileChooser.OPEN_DIALOG);
             wjopen.setVisible(true);
            wjopen.addChoosableFileFilter(new FileNameExtensionFilter("PNG文件(png)","png"));
            int value=wjopen.showOpenDialog(null);
             
            if(value==JFileChooser.APPROVE_OPTION){//用户点击了打开
                 
                File openfile=  wjopen.getSelectedFile();
           
                byte[] bytes =FileUtils.readFileToByteArray(openfile);
                 
                label1.setIcon(new ImageIcon(bytes));
                 
                 
                 
                 String text =QRCodeUtil.decode(new FileInputStream(openfile));
                  
                 textArea1.setText(text);
      
         }
             
          
              
        } catch (Exception e2) {
            e2.printStackTrace();
        }
      }
  
       
    /**
     * 生成qr图形 并在label1中显示
     * @author jelly
     * @param e
     */
     void generateQRImg(ActionEvent e) {
         String text = textArea1.getText();
         if(text==null||text.trim().equals("")) {
             JOptionPane.showMessageDialog(null, "原文内容不能为空!");
             return ;
         }
         ByteArrayOutputStream output=new ByteArrayOutputStream();
         try {
            QRCodeUtil.encode(text, null, output, true);
         } catch (Exception e1) {
            e1.printStackTrace();
            JOptionPane.showMessageDialog(null, e1.getMessage(), "错误", JOptionPane.ERROR_MESSAGE);
         }
         byte[] bytes =output.toByteArray();
 
         label1.setIcon(new ImageIcon(bytes));
    }
  
}

QRCodeUtil.java

package com.tingcream.qrTool.qrcode;
 
  
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.InputStream;
import java.io.OutputStream;
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;
 
/**
 * 二维码工具类  google.zxing包
 *
 * @author jelly
 */
public class QRCodeUtil {
 
    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "png";
     
    // 二维码尺寸
    private static final int QRCODE_SIZE = 300; //即 300 * 300 像素
     
     
    // LOGO宽度
    private static final int LOGO_WIDTH = 60;
    // LOGO高度
    private static final int LOGO_HEIGHT = 60;
     
 
    /**
     * 创建qrcode 二维码
     * @param content  原文内容
     * @param logoInput  可为null，若为null，则二维码中不会插入logo
     * @param needCompress  是否需要颜色
     * @return
     * @throws Exception
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public  static BufferedImage createQrImage(String content,InputStream logoInput,
            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 (logoInput==null) {
            return image;
        }else {
             // 插入logo图片
            QRCodeUtil.insertLogo(image, logoInput, needCompress);
            return image;
        }
        
    }
 
     /**
      * 图形二维码中插入logo图形
      * @param source
      * @param logoPath
      * @param needCompress
      * @throws Exception
      */
    private static void insertLogo(BufferedImage source, InputStream logoInput,
            boolean needCompress) throws Exception {
         
        Image src =ImageIO.read(logoInput);
         
        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();
    }
  
  
     
     
  
      /**
       * 二维码编码    xx
       * @param text   原文内容
       * @param logoIn  logo图 ,可为null
       * @param output  二维码图形输出outputstream
       * @param needCompress  是否需要颜色
       * @throws Exception
       */
      public static void encode(String  text,InputStream logoIn,OutputStream output,boolean needCompress) throws Exception {
          BufferedImage image = createQrImage(text, logoIn, needCompress);
          ImageIO.write(image, FORMAT_NAME, output);
           
      }
     
      
 
    /**
     * 二维码解码 xx
     * @param in  二维码图input流
     * @return 原文内容
     * @throws Exception
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static String decode(InputStream in) throws Exception {
         
        BufferedImage  image=ImageIO.read(in);
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
          
        Hashtable hints = new Hashtable();
         hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
          Result  result = new MultiFormatReader().decode(bitmap, hints);
         return  result.getText();
    }
    
    
//    public static void main(String[] args) throws Exception {
//     
//      //二维码编码
////        String text = "hello\n你好哈哈";
////        OutputStream output=new FileOutputStream(new File("d:/qr.png"));
////        QRCodeUtil.encode(text, null, output, true);
//     
//      //二维码解码
////        InputStream in=new FileInputStream(new File("d:/qr.png"));
////         String result=QRCodeUtil.decode(in);
////         System.out.println(result);
//    }
    
}

BufferedImageLuminanceSource.java　（google的LuminanceSource 封装）

package com.tingcream.qrTool.qrcode;
 
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import com.google.zxing.LuminanceSource;
 
public class BufferedImageLuminanceSource extends LuminanceSource {
     
    private final BufferedImage image;
    private final int left;
    private final int top;
 
    public BufferedImageLuminanceSource(BufferedImage image) {
        this(image, 0, 0, image.getWidth(), image.getHeight());
    }
 
    public BufferedImageLuminanceSource(BufferedImage image, int left,
            int top, int width, int height) {
        super(width, height);
 
        int sourceWidth = image.getWidth();
        int sourceHeight = image.getHeight();
        if (left + width > sourceWidth || top + height > sourceHeight) {
            throw new IllegalArgumentException(
                    "Crop rectangle does not fit within image data.");
        }
 
        for (int y = top; y < top + height; y++) {
            for (int x = left; x < left + width; x++) {
                if ((image.getRGB(x, y) & 0xFF000000) == 0) {
                    image.setRGB(x, y, 0xFFFFFFFF); // = white
                }
            }
        }
 
        this.image = new BufferedImage(sourceWidth, sourceHeight,
                BufferedImage.TYPE_BYTE_GRAY);
        this.image.getGraphics().drawImage(image, 0, 0, null);
        this.left = left;
        this.top = top;
    }
 
    
    public byte[] getRow(int y, byte[] row) {
        if (y < 0 || y >= getHeight()) {
            throw new IllegalArgumentException(
                    "Requested row is outside the image: " + y);
        }
        int width = getWidth();
        if (row == null || row.length < width) {
            row = new byte[width];
        }
        image.getRaster().getDataElements(left, top + y, width, 1, row);
        return row;
    }
 
    
    public byte[] getMatrix() {
        int width = getWidth();
        int height = getHeight();
        int area = width * height;
        byte[] matrix = new byte[area];
        image.getRaster().getDataElements(left, top, width, height, matrix);
        return matrix;
    }
 
    
    public boolean isCropSupported() {
        return true;
    }
 
    
    public LuminanceSource crop(int left, int top, int width, int height) {
        return new BufferedImageLuminanceSource(image, this.left + left,
                this.top + top, width, height);
    }
 
    
    public boolean isRotateSupported() {
        return true;
    }
 
    
    public LuminanceSource rotateCounterClockwise() {
        int sourceWidth = image.getWidth();
        int sourceHeight = image.getHeight();
        AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0,
                0.0, 0.0, sourceWidth);
        BufferedImage rotatedImage = new BufferedImage(sourceHeight,
                sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
        Graphics2D g = rotatedImage.createGraphics();
        g.drawImage(image, transform, null);
        g.dispose();
        int width = getWidth();
        return new BufferedImageLuminanceSource(rotatedImage, top,  sourceWidth - (left + width), getHeight(), width);
    }
}

项目pom.xml

  4.0.0
 
  com.tingcream
  qrTool
  0.0.1-SNAPSHOT
  jar
 
  qrTool
  http://maven.apache.org
 
  
    UTF-8
  
   
  
 
  
        
            com.google.zxing
            javase
            3.2.1
        
     
        
    
         
         
        
          
            commons-io
            commons-io
            2.6