使用google的zxing生成二维码

二维码，又叫二维条码。

1.java这边的话生成二维码有很多开发的jar包如 zxing,qrcode ，下面是使用zxing的开发包来实现的。

ZXing项目是google code上面提供的一个关于条码编解码的开源项目。

2.先下载zxing开发包，这里用到的只是core的jar包

我在项目中使用的core2.2.jar包。

下载地址：http://download.csdn.net/download/tvcctv27tv/6841023

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

3. 源代码

package com.test.qrcodes;

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 junit.framework.Assert;

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;

public class TestQRCodes {

private static final boolean NEEDCOMPRESS = false;

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 = "";// 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.sina.com.cn";
String src = createQRCode(url, 200, "1");
System.out.println(url.length());
String html = "<img src=\"" + src + "\">";
FileOutputStream ops = new FileOutputStream("D:\\QRCodeImage\\test.html");
org.apache.commons.io.IOUtils.write(html, ops, "utf-8");
ops.close();
}
}