需要的jar包分別是：core-2.2.jar、javase-2.2.jar

<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>core</artifactId>
	<version>2.2</version>
</dependency>

<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>javase</artifactId>
	<version>2.2</version>
</dependency>
 

package example;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
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;

/**
 * 二維碼工具類
 * 
 * @author Administrator
 * 
 */
public class QRCodeTool {

	/**
	 * 生成二維碼
	 * 
	 * @param qrCodeData
	 *            二維碼字串
	 * @param filePath
	 *            檔案路徑
	 * @param charset
	 *            字元編碼
	 * @param hintMap
	 * @param qrCodeheight
	 *            二維碼的高度
	 * @param qrCodewidth
	 *            二維碼的寬度
	 * @throws WriterException
	 * @throws IOException
	 */
	public static void createQRCode(String qrCodeData, String filePath,
			String charset, Map hintMap, int qrCodeheight, int qrCodewidth)
			throws WriterException, IOException {
		BitMatrix matrix = new MultiFormatWriter().encode(
				new String(qrCodeData.getBytes(charset), charset),
				BarcodeFormat.QR_CODE, qrCodewidth, qrCodeheight, hintMap);
		MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath
				.lastIndexOf('.') + 1), new File(filePath));
	}

	/**
	 * 讀取二維碼
	 * 
	 * @param filePath
	 *            檔案路徑
	 * @param charset
	 *            字元編碼
	 * @param hintMap
	 * @return
	 * @throws FileNotFoundException
	 * @throws IOException
	 * @throws NotFoundException
	 */
	public static String readQRCode(String filePath, String charset, Map hintMap)
			throws FileNotFoundException, IOException, NotFoundException {
		BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
				new BufferedImageLuminanceSource(
						ImageIO.read(new FileInputStream(filePath)))));
		Result qrCodeResult = new MultiFormatReader().decode(binaryBitmap,
				hintMap);
		return qrCodeResult.getText();
	}
}
 

package example;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import com.google.zxing.EncodeHintType;
import com.google.zxing.NotFoundException;
import com.google.zxing.WriterException;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCodeToolTest {

	public static void main(String[] args) throws WriterException, IOException,
			NotFoundException {
		// 二維碼字串
		String qrCodeData = "https://www.baidu.com/";
		// 二維碼名稱
		String filePath = "QRCode.png";
		// 字元編碼
		String charset = "UTF-8"; // "ISO-8859-1"
		Map hintMap = new HashMap();
		hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
		QRCodeTool.createQRCode(qrCodeData, filePath, charset, hintMap, 400,
				400);
		System.out.println("二維碼影象建立成功!");

		System.out.println("讀取二維碼資料: "
				+ QRCodeTool.readQRCode(filePath, charset, hintMap));
	}

}