java生成二维码使用QRCode和ZXing两种方式

QRCode是日本人开发的ZXing是google开发的

QRCode开发需要包 http://download.csdn.net/detail/xiaokui_wingfly/7957815

ZXing开发需要包 http://download.csdn.net/detail/u010457960/5301392

QRCode方式：

package cn.utils;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.imageio.ImageIO;

import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.data.QRCodeImage;
import jp.sourceforge.qrcode.exception.DecodingFailedException;

import com.swetake.util.Qrcode;

public class QRCodeUtils {
	/**
	 * 编码字符串内容到目标File对象中
	 * 
	 * @param encodeddata 编码的内容
	 * @param destFile	生成file文件  1381090722   5029067275903
	 * @throws IOException
	 */
	public static void qrCodeEncode(String encodeddata, File destFile) throws IOException {
		Qrcode qrcode = new Qrcode();
		qrcode.setQrcodeErrorCorrect('M');	// 纠错级别（L 7%、M 15%、Q 25%、H 30%）和版本有关
		qrcode.setQrcodeEncodeMode('B');	
		qrcode.setQrcodeVersion(7);		// 设置Qrcode包的版本
		
		byte[] d = encodeddata.getBytes("GBK");	// 字符集
		BufferedImage bi = new BufferedImage(139, 139, BufferedImage.TYPE_INT_RGB);
		// createGraphics	// 创建图层
		Graphics2D g = bi.createGraphics();
		
		g.setBackground(Color.WHITE);	// 设置背景颜色（白色）
		g.clearRect(0, 0, 139, 139);	// 矩形 X、Y、width、height
		g.setColor(Color.BLACK);	// 设置图像颜色（黑色）

		if (d.length > 0 && d.length < 123) {
			boolean[][] b = qrcode.calQrcode(d);
			for (int i = 0; i < b.length; i++) {
				for (int j = 0; j < b.length; j++) {
					if (b[j][i]) {
						g.fillRect(j * 3 + 2, i * 3 + 2, 3, 3);
					}
				}
			}
		}
		
//		Image img = ImageIO.read(new File("D:/tt.png"));  logo
//		g.drawImage(img, 25, 55,60,50, null);
				
		g.dispose(); // 释放此图形的上下文以及它使用的所有系统资源。调用 dispose 之后，就不能再使用 Graphics 对象
		bi.flush(); // 刷新此 Image 对象正在使用的所有可重构的资源

		ImageIO.write(bi, "png", destFile);
		System.out.println("Input Encoded data is：" + encodeddata);
	}

	/**
	 * 解析二维码，返回解析内容
	 * 
	 * @param imageFile
	 * @return
	 */
	public static String qrCodeDecode(File imageFile) {
		String decodedData = null;
		QRCodeDecoder decoder = new QRCodeDecoder();
		BufferedImage image = null;
		try {
			image = ImageIO.read(imageFile);
		} catch (IOException e) {
			System.out.println("Error: " + e.getMessage());
		}

		try {
			decodedData = new String(decoder.decode(new J2SEImage(image)), "GBK");
			System.out.println("Output Decoded Data is：" + decodedData);
		} catch (DecodingFailedException dfe) {
			System.out.println("Error: " + dfe.getMessage());
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return decodedData;
	}

	public static void main(String[] args) {
		String FilePath = "d:/qrcode.png";
		File qrFile = new File(FilePath);

		// 二维码内容
		String encodeddata = "Hello X-rapido";
		try {
			QRCodeUtils.qrCodeEncode(encodeddata, qrFile);
		} catch (IOException e) {
			e.printStackTrace();
		}

		// 解码
		String reText = QRCodeUtils.qrCodeDecode(qrFile);
		System.out.println(reText);
	}
}

class J2SEImage implements QRCodeImage {
	BufferedImage image;

	public J2SEImage(BufferedImage image) {
		this.image = image;
	}

	public int getWidth() {
		return image.getWidth();
	}

	public int getHeight() {
		return image.getHeight();
	}

	public int getPixel(int x, int y) {
		return image.getRGB(x, y);
	}
}

package cn.utils.code;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import com.google.zxing.common.BitMatrix;

/**
 * 二维码的生成需要借助MatrixToImageWriter类，该类是由Google提供的，可以将该类直接拷贝到源码中使用
 */
public class MatrixToImageWriter {
	private static final int BLACK = 0xFF000000;
	private static final int WHITE = 0xFFFFFFFF;

	private MatrixToImageWriter() {
	}

	public static BufferedImage toBufferedImage(BitMatrix matrix) {
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		for (int x = 0; x < width; x++) {
			for (int y = 0; y < height; y++) {
				image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
			}
		}
		return image;
	}

	public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, file)) {
			throw new IOException("Could not write an image of format " + format + " to " + file);
		}
	}

	public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, stream)) {
			throw new IOException("Could not write an image of format " + format);
		}
	}
}

package cn.utils.code;

import java.io.File;
import java.util.Hashtable;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

public class Main {
	public static void main(String[] args) throws Exception {
		String text = "NiuYueYue I Love You！"; // 二维码内容
		int width = 300; // 二维码图片宽度
		int height = 300; // 二维码图片高度
		String format = "gif";// 二维码的图片格式
		
		Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8");	// 内容所使用字符集编码
		
		BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
		// 生成二维码
		File outputFile = new File("d:" + File.separator + "new.gif");
		MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
	}
}

推荐一个网站 草料二维码 http://cli.im/text

原文：http://blog.csdn.net/xiaokui_wingfly/article/details/39476185