如何生成二维码代码详解-白红宇

如何生成二维码代码详解

阅读量：4036 次

发布时间：2019-05-24

本文共 3018 字，大约阅读时间需要 10 分钟。

如何生成二维码代码详解，具体实现可以查看原文http://my.oschina.net/mkh/blog/151633

1. [代码][Java]代码

                      
    
import
 java.awt.image.BufferedImage; 
    
import
 java.io.File; 
    
import
 java.io.IOException; 
    
import
 java.util.Hashtable; 
    
import
 java.util.Scanner;
    
import
 javax.imageio.ImageIO; 
    
import
 com.google.zxing.BarcodeFormat; 
    
import
 com.google.zxing.BinaryBitmap; 
    
import
 com.google.zxing.DecodeHintType; 
    
import
 com.google.zxing.LuminanceSource; 
    
import
 com.google.zxing.MultiFormatReader; 
    
import
 com.google.zxing.MultiFormatWriter; 
    
import
 com.google.zxing.Reader; 
    
import
 com.google.zxing.ReaderException; 
    
import
 com.google.zxing.Result; 
    
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
 TestEnDeCode { 
       
        
/**
         
* 
         
*/
        
public
 TestEnDeCode() { 
            
// TODO Auto-generated constructor stub 
        
} 
       
        
/**
         
* @param args
         
*/
        
public
 static
 void
 main(String[] args) { 
            
TestEnDeCode t=
new
 TestEnDeCode(); 
            
Scanner in = 
new
 Scanner(System.in);
            
System.out.println(
"编码内容："
);
            
String str = in.next();
//            String str = "http://www.baidu.com";
            
String path = 
"D:/Qr_pics/test7.png"
;
            
t.encode(str, path); 
            
t.decode(path); 
        
} 
       
        
/*
         
* 编码：
         
* 1 将内容转换成二维矩阵
         
* 2 将该二维矩阵转换成图片
         
* */
        
public
 void
 encode(String str, String path) { 
            
try
 { 
//                String str = "http://www.baidu.com百度看看";// 二维码内容 
//                String path = "D:/Qr_pics/test7.png"; //二维码图片生成 路径及名称
                
BitMatrix byteMatrix; 
                
byteMatrix = 
new
 MultiFormatWriter().encode(
new
 String(str.getBytes(
"UTF-8"
),
"UTF-8"
), BarcodeFormat.QR_CODE, 
800
, 
800
); 
//将文字转换成二维矩阵，并设置矩阵大小，这里的矩阵大小就是后面生成的图片像素大小
                
File file = 
new
 File(path);
//新建矩阵文件 
                
MatrixToImageWriter.writeToFile(byteMatrix, 
"gif"
, file);
//将矩阵文件转换成图片文件 
            
} 
catch
 (Exception e) { 
                
e.printStackTrace(); 
            
} 
        
} 
       
        
/*
         
* 解码：
         
* 1 将图片反解码为二维矩阵
         
* 2 将该二维矩阵解码为内容
         
* */
        
public
 void
 decode(String imgPath) { 
            
try
 { 
                
Reader reader = 
new
 MultiFormatReader(); 
//                String imgPath = "D:/Qr_pics/test7.png";//获取即将被解码图片的路径 
                
File file = 
new
 File(imgPath);
//获取该图片文件 
                
BufferedImage image; 
                
try
 { 
                    
image = ImageIO.read(file); 
                    
if
 (image == 
null
) { 
                        
System.out.println(
"Could not decode image"
); 
                    
} 
                    
LuminanceSource source = 
new
 BufferedImageLuminanceSource(image); 
                    
BinaryBitmap bitmap = 
new
 BinaryBitmap(
new
 HybridBinarizer(source)); 
                    
Result result; 
                    
Hashtable hints = 
new
 Hashtable();
//将图片反解码为二维矩阵 
                    
hints.put(DecodeHintType.CHARACTER_SET, 
"UTF-8"
); 
                    
result = 
new
 MultiFormatReader().decode(bitmap, hints);
//将该二维矩阵解码成内容 
                    
String resultStr = result.getText(); 
                    
System.out.println(
"\n解码结果：\n"
+resultStr); 
       
                
} 
catch
 (IOException ioe) { 
                    
System.out.println(ioe.toString()); 
                
} 
catch
 (ReaderException re) { 
                    
System.out.println(re.toString()); 
                
} 
   
            
} 
catch
 (Exception ex) { 
                
System.out.println(ex.toString());
            
} 
        
} 
       
    
}
       
     