1.引入jar包

zxing-core-1.7.jar ： http://viralpatel.net/blogs/download/jar/zxing-core-1.7.jar

zxing-javase-1.7.jar ： http://viralpatel.net/blogs/download/jar/zxing-j2se-1.7.jar

2.工具類—QRCodeUtil.java

  1 package com.ray.util;
  2 
  3 import java.awt.image.BufferedImage;
  4 import java.io.File;
 
  5 import java.util.Hashtable;
  6 import java.util.Random;
  7 import javax.imageio.ImageIO;
  8 
  9 import com.google.zxing.BarcodeFormat;
 10 import com.google.zxing.Binarizer;
 11 import com.google.zxing.BinaryBitmap;
 12 import com.google.zxing.EncodeHintType;
 13 import com.google.zxing.LuminanceSource;
 
 14 import com.google.zxing.MultiFormatReader;
 15 import com.google.zxing.MultiFormatWriter;
 16 import com.google.zxing.Result;
 17 import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
 18 import com.google.zxing.client.j2se.MatrixToImageWriter;
 19 import com.google.zxing.common.BitMatrix;
 
 20 import com.google.zxing.common.HybridBinarizer;
 21 
 22 public class QRCodeUtil {
 23 
 24     /**
 25      * 根據內容，生成指定寬高、指定格式的二維碼圖片
 26      *
 27      * @param text   內容
 28      * @param width  寬
 29      * @param height 高
 30      * @param format 圖片格式
 31      * @return 生成的二維碼圖片路徑
 32      * @throws Exception
 33      */
 34     public static String generateQRCode(String text, int width, int height, String format) throws Exception {
 35         Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
 36         hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
 37         BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
 38        
 39         String pathName = "D:/new.png";   //指定輸出文件的路徑
 40         File outputFile = new File(pathName);
 41         MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
 42      
 43         return pathName;
 44     }
 45     
 46     /**
 47      * 隨機生成指定長度的驗證碼
 48      *
 49      * @param length 驗證碼長度
 50      * @return 生成的驗證碼
 51      */
 52     public  static String generateNumCode(int length) {
 53         String val = "";
 54         String charStr = "char";
 55         String numStr = "num";
 56         Random random = new Random();
 57 
 58         //參數length，表示生成幾位隨機數
 59         for (int i = 0; i < length; i++) {
 60 
 61             String charOrNum = random.nextInt(2) % 2 == 0 ? charStr : numStr;
 62             //輸出字母還是數字
 63             if (charStr.equalsIgnoreCase(charOrNum)) {
 64                 //輸出是大寫字母還是小寫字母
 65                 int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;
 66                 val += (char) (random.nextInt(26) + temp);
 67             } else if (numStr.equalsIgnoreCase(charOrNum)) {
 68                 val += String.valueOf(random.nextInt(10));
 69             }
 70         }
 71         return val;
 72     }
 73     
 74     /**
 75      * 解析指定路徑下的二維碼圖片
 76      *
 77      * @param filePath 二維碼圖片路徑
 78      * @return
 79      */
 80     public static String parseQRCode(String filePath) {
 81         String content = "";
 82         try {
 83             File file = new File(filePath);
 84             BufferedImage image = ImageIO.read(file);
 85             LuminanceSource source = new BufferedImageLuminanceSource(image);
 86             Binarizer binarizer = new HybridBinarizer(source);
 87             BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
 88             Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
 89             hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
 90             MultiFormatReader formatReader = new MultiFormatReader();
 91             Result result = formatReader.decode(binaryBitmap,  hints);
 92 
 93             System.out.println("result 為：" + result.toString());
 94             System.out.println("resultFormat 為：" + result.getBarcodeFormat());
 95             System.out.println("resultText 為：" + result.getText());
 96             //設置返回值
 97             content = result.getText();
 98         } catch (Exception e) {
 99             e.printStackTrace();
100         }
101         return content;
102     }
103     
104     
105     
106     
107     
108 }

3.測試類—QRCodeTest.java

 1 package com.ray.test;
 2 
 3 import org.junit.Test;
 4 import com.ray.util.QRCodeUtil;
 5 
 6 
 7 public class QRCodeTest {
 8 
 9     @Test
10     public void testQRCode(){
11         //String text = QRCodeUtil.generateNumCode(12);  //隨機生成的12位驗證碼
12         //System.out.println("隨機生成的12位驗證碼為： " + text);
13 
14         String text="你好啊，@￥%[email protected]#$%,//";
15         System.out.println("text");
16         int width = 100;    //二維碼圖片的寬
17         int height = 100;   //二維碼圖片的高
18         String format = "png";  //二維碼圖片的格式
19 
20         try {
21             //生成二維碼圖片，並返回圖片路徑
22             String pathName = QRCodeUtil.generateQRCode(text, width, height, format);
23             System.out.println("生成二維碼的圖片路徑： " + pathName);
24 
25             String content = QRCodeUtil.parseQRCode(pathName);
26             System.out.println("解析出二維碼的圖片的內容為： " + content);
27         } catch (Exception e) {
28             e.printStackTrace();
29         }
30 
31 
32     }
33 
34     
35 
36 }

參考文章： Java生成、解析二維碼 ( http://www.cnblogs.com/xz-luckydog/p/6402568.html)

Java_util_02_二維碼的生成與解析