Java二维码生成与解码工具Zxing使用

古城微笑少年丶 2022-08-02 15:38 168阅读 0赞

Zxing是Google研发的一款非常好用的开放源代码的二维码生成工具，目前源码托管在github上，源码地址：  
[https://github.com/zxing/zxing][https_github.com_zxing_zxing]

![这里写图片描述][20150725133702227]

可以看到Zxing库有很多个模块，在Java语言中使用Zxing只需要关注core和javase两个模块，读者可以clone一份源码到本地，將core和javase两个工程打成jar包，添加到自己的工程中即可。

笔者看来，我们没有必要那样做，因为zxing的jar包我们可以从maven资源库中获取：  
打开maven资源库[http://www.mvnrepository.com/][http_www.mvnrepository.com]，搜索zxing：  
![这里写图片描述][20150725134558950]  
前两条搜索结果就是我们需要的jar包，点进去下载即可，笔者在csdn上也上传了一份：  
csdn下载地址：  
[http://download.csdn.net/detail/rongbo\_j/8928013][http_download.csdn.net_detail_rongbo_j_8928013]

新建java工程，將core-3.2.0.jar和javase-3.2.0.jar添加到build path中：

![这里写图片描述][20150725134921391]

下面我们来编写二维码生成与识别测试用例：

package com.csii.zxing.test;
    
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Hashtable;
    import java.util.Map; 
    
    import javax.imageio.ImageIO; 
    
    import org.junit.Test; 
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.Binarizer;
    import com.google.zxing.BinaryBitmap;
    import com.google.zxing.DecodeHintType;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.LuminanceSource;
    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.client.j2se.MatrixToImageWriter;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.common.HybridBinarizer;
    
    public class ZxingTest {
        @SuppressWarnings("deprecation")
        @Test
        public void testEncoder()
        {
                //二维码内容
                String text = "http://blog.csdn.net/rongbo_j"; 
                int width = 200; //二维码图片宽度
                int height = 200; //高度
                String format = "gif"; //图片格式
    
                Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(); 
                hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
                BitMatrix bitMatrix = null;
                try {
                    //编码
                    bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
                } catch (WriterException e1) { 
                    e1.printStackTrace();
                }    
                File outputFile = new File("src/1.gif"); 
                try {
                    //输出二维码图片
                    MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
                } catch (IOException e) { 
                    e.printStackTrace();
                }
    
        }
        @Test
        public void testDecoder() throws NotFoundException
        { 
                //二维码图片路径
                String path = this.getClass().getClassLoader().getResource("1.gif").getPath();
                File imageFile = new File(path);
                BufferedImage image = null;
                try {
                    image = ImageIO.read(imageFile);
                     LuminanceSource source = new BufferedImageLuminanceSource(image); 
                     Binarizer binarizer = new HybridBinarizer(source); 
                     BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
                     Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
                     hints.put(DecodeHintType.CHARACTER_SET, "UTF-8"); 
                     //解码获取二维码中信息
                     Result result = new MultiFormatReader().decode(binaryBitmap, hints); 
                     System.out.println(result.getText());
                } catch (IOException e) { 
                    e.printStackTrace();
                } 
        }
    }

上面的代码使用到了Junit4，打开Outline视图，在testEncoder()方法上点击右键=>Debug As=>Junit Test，可以看到src目录下生成一张gif图片：  
![这里写图片描述][20150725135534103]

运行testDecoder()方法对该图片进行识别，控制台输出：

http://blog.csdn.net/rongbo_j

[https_github.com_zxing_zxing]: https://github.com/zxing/zxing
[20150725133702227]: /images/20220731/2228b53b8d2a4f8bb76f41871a31abaf.png
[http_www.mvnrepository.com]: http://www.mvnrepository.com/
[20150725134558950]: /images/20220731/1340885fff7047efa94a47e49b4587e6.png
[http_download.csdn.net_detail_rongbo_j_8928013]: http://download.csdn.net/detail/rongbo_j/8928013
[20150725134921391]: /images/20220731/e1f1d6789c2d47628ee934c9b80e96f3.png
[20150725135534103]: /images/20220731/f63c947280d844abbebcda9b6b67e91a.png