使用zxing库进行二维码的制作和扫描

package com.ahut.util;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.alibaba.fastjson.JSONObject;
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;

/**
*
* @ClassName: QRCodeUtil
* @Description: 二维码工具类
* @author cheng
* @date 2017年10月23日 下午5:27:01
*/
public class QRCodeUtil {

/**
*
* @Title: testEncode
* @Description:
* @throws WriterException
* @throws IOException
*
* com.google.zxing.MultiFormatWriter 根据内容以及图像编码参数生成图像2D矩阵。
* com.google.zxing.client.j2se.MatrixToImageWriter
* 根据图像矩阵生成图片文件或图片缓存 BufferedImage 。
*/
public static void testEncode() throws WriterException, IOException {
String filePath = "E://";
String fileName = "zxing.png";
JSONObject json = new JSONObject();
json.put("zxing", "https://github.com/zxing/zxing/tree/zxing-3.0.0/javase/src/main/java/com/google/zxing");
json.put("author", "shihy");
String content = json.toJSONString();// 内容
int width = 200; // 图像宽度
int height = 200; // 图像高度
String format = "png";// 图像类型
Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);// 生成矩阵
Path path = FileSystems.getDefault().getPath(filePath, fileName);
MatrixToImageWriter.writeToPath(bitMatrix, format, path);// 输出图像
System.out.println("输出成功.");
}

/**
*
* @Title: testDecode
* @Description:
*
* 使用 javax.imageio.ImageIO 读取图片文件，并存为一个
* java.awt.image.BufferedImage 对象。
*
* 将 java.awt.image.BufferedImage 转换为 ZXing 能识别的
* com.google.zxing.BinaryBitmap 对象。
*
* com.google.zxing.MultiFormatReader 根据图像解码参数来解析
* com.google.zxing.BinaryBitmap 。
*/
public static void testDecode() {
String filePath = "E://zxing.png";
BufferedImage image;
try {
image = ImageIO.read(new File(filePath));
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");
Result result = new MultiFormatReader().decode(binaryBitmap, hints);// 对图像进行解码
JSONObject content = JSONObject.parseObject(result.getText());
System.out.println("图片中内容： ");
System.out.println("author： " + content.getString("author"));
System.out.println("zxing： " + content.getString("zxing"));
System.out.println("图片中格式： ");
System.out.println("encode： " + result.getBarcodeFormat());
} catch (IOException e) {
e.printStackTrace();
} catch (NotFoundException e) {
e.printStackTrace();