使用google的zxing生成二维码

.先下载zxing开发包，这里用到的只是core的jar包

注意：网上下载的core.jar使用JDK1.5；core2*.jar包使用JDK1.6；core3*.jar使用JDK1.7;

源码：

package com.common.redis;

import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.image.BufferedImage;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Hashtable;

import javax.imageio.ImageIO;

import org.apache.commons.codec.binary.Base64;

import org.apache.commons.lang.StringUtils;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.common.BitMatrix;

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import junit.framework.Assert;

public class TestQRCodes {

private static final boolean NEEDCOMPRESS = true;

private static String LOGO_URL;

// LOGO宽度

private static final int WIDTH = 60;

// LOGO高度

private static final int HEIGHT = 60;

static{

LOGO_URL = "D:\\Users\\ex-zouxi001\\Desktop\\2号.JPG";// 测试图片路径地址

}

/**

* 生成二维码的工具类

*

* @param data

* 二维码中携带的数据

* @param width

* 二维码的宽度

* @param height

* 二维码的高度

* @return 返回base64格式的图片（data:image/gif;base64,xxxx） <br>

* eg： <code>

* <img alt="" src="data:image/gif;base64,xxxx">

* </code>

*/

public static String createQRCode(String data, int width, int height, String isPicture) {

Assert.assertTrue("param data cannot empty.", data != null && data.trim().length() > 0);

Assert.assertTrue("param width and height must gt 0.", width > 0 && height > 0);

ByteArrayOutputStream bos = null;

MultiFormatWriter formatWriter = new MultiFormatWriter();

Hashtable<EncodeHintType, Object> param = new Hashtable<EncodeHintType, Object>();

param.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.Q);

param.put(EncodeHintType.CHARACTER_SET, "utf-8");

param.put(EncodeHintType.MARGIN, 0);

try{

BitMatrix bitMatrix = formatWriter

.encode(data, BarcodeFormat.QR_CODE, width, height, param);

// 1.1去白边

int[] rec = bitMatrix.getEnclosingRectangle();

int resWidth = rec[2] + 1;

int resHeight = rec[3] + 1;

BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);

resMatrix.clear();

for (int i = 0; i < resWidth; i++){

for (int j = 0; j < resHeight; j++){

if (bitMatrix.get(i + rec[0], j + rec[1])){

resMatrix.set(i, j);

}

}

}

int width1 = resMatrix.getWidth();

int height1 = resMatrix.getHeight();

BufferedImage qrcode = new BufferedImage(width1, height1, BufferedImage.TYPE_INT_RGB);

for (int x = 0; x < width1; x++){

for (int y = 0; y < height1; y++){

qrcode.setRGB(x, y, resMatrix.get(x, y) == true ? Color.BLACK.getRGB() : Color.WHITE

.getRGB());

}

}

// 添加logo图片

if (StringUtils.isNotEmpty(LOGO_URL) && StringUtils.isNotEmpty(isPicture)){

insertImage(width1, qrcode, LOGO_URL, NEEDCOMPRESS);

}

bos = new ByteArrayOutputStream();

ImageIO.write(qrcode, "png", bos);

String img = StringUtils.deleteWhitespace(Base64.encodeBase64String(bos.toByteArray()));

return String.format("data:image/png;base64,%s", img);

} catch (Exception e){

throw new RuntimeException(e);

} finally{

if (bos != null){

try{

bos.close();

} catch (IOException e){

}

}

}

}

private static void insertImage(int QRCODE_SIZE, BufferedImage source, String imgPath,

boolean needCompress) throws Exception {

File file = new File(imgPath);

if (!file.exists()){

System.err.println("" + imgPath + " 该文件不存在！");

return;

}

Image src = ImageIO.read(new File(imgPath));

int width = src.getWidth(null);

int height = src.getHeight(null);

if (needCompress){ // 压缩LOGO

if (width > WIDTH){

width = WIDTH;

}

if (height > HEIGHT){

height = HEIGHT;

}

Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);

BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(image, 0, 0, null); // 绘制缩小后的图

g.dispose();

src = image;

}

// 插入LOGO

Graphics2D graph = source.createGraphics();

int x = (QRCODE_SIZE - width) / 2;

int y = (QRCODE_SIZE - height) / 2;

graph.drawImage(src, x, y, width, height, null);

// Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);

graph.setStroke(new BasicStroke(3f));

// graph.draw(shape); 去除图片白边

graph.dispose();

}

/**

* @param data

* 二维码携带的数据

* @param size

* 二维码的宽、高

* @return

* @see WechatValidateUtils#generateQRCode(String, int, int)

*/

public static String createQRCode(String data, int size, String isPicture) {

return createQRCode(data, size, size, isPicture);

}

// 测试

public static void main(String[] args) throws Exception {

// 生成二维码

String url = "http://www.baidu.com";

String src = createQRCode(url, 200, "1");

System.out.println(url.length());

String html = "<img src=\"" + src + "\">";

FileOutputStream ops = new FileOutputStream("D:\\ssss\\test.html");

org.apache.commons.io.IOUtils.write(html, ops, "utf-8");

ops.close();

}

}