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Java生成中间logo的二维码(还可以加上二维码名称哦)

2015-12-15 09:07 871 查看
最近有负责微信开发,对于微信开发的项目,肯定少不了二维码啦,正好有个这样的需求,这对不同的商品生成一个二维码,扫码即刻下单。博主就弄了一个二维码生成的工具类。

弄出来之后,产品经理又说了,中间放上公司的logo是不是好一点?加上吧,

加上公司logo之后,产品经理想了想,每个商品都有个二维码,销售人员有很多个商品二维码,群发给用户,在qq群上,微信群上,怎么知道哪个二维码对应哪个商品的呢?于是决定要加上商品名称。最后商品二维码就成了下面这个模样了(当然啦,这里面的logo并不是博主现职公司的)。



效果已经出来啦,下面附上代码啦

如果读者不需要logo或者二维码名称的,读懂代码后进行删减即可。注释多多,还是很容易看懂的。

package com.luo.wctweb.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;
import org.apache.commons.codec.binary.Base64;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
* @Description: (二维码)
* @author:luoguohui
* @date:2015-10-29 下午05:27:13
*/
public class ZXingCode
{
private static final int QRCOLOR = 0xFF000000;   //默认是黑色
private static final int BGWHITE = 0xFFFFFFFF;   //背景颜色

public static void main(String[] args) throws WriterException
{
try
{
getLogoQRCode("https://www.baidu.com/", "跳转到百度的二维码");
}
catch (Exception e)
{
e.printStackTrace();
}
}

/**
* 生成带logo的二维码图片
*
* @param qrPic
* @param logoPic
*/
public static String getLogoQRCode(String qrUrl,String productName)
{
//      String filePath = (javax.servlet.http.HttpServletRequest)request.getSession().getServletContext().getRealPath("/") + "resources/images/logoImages/llhlogo.png";
//filePath是二维码logo的路径,但是实际中我们是放在项目的某个路径下面的,所以路径用上面的,把下面的注释就好
String filePath = "C:/Users/luoguohui/Desktop/78310a55b319ebc4fa3aef658126cffc1f17168f.png";  //TODO
String content = qrUrl;
try
{
ZXingCode zp = new ZXingCode();
BufferedImage bim = zp.getQR_CODEBufferedImage(content, BarcodeFormat.QR_CODE, 400, 400, zp.getDecodeHintType());
return zp.addLogo_QRCode(bim, new File(filePath), new LogoConfig(), productName);
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}

/**
* 给二维码图片添加Logo
*
* @param qrPic
* @param logoPic
*/
public String addLogo_QRCode(BufferedImage bim, File logoPic, LogoConfig logoConfig, String productName)
{
try
{
/**
* 读取二维码图片,并构建绘图对象
*/
BufferedImage image = bim;
Graphics2D g = image.createGraphics();

/**
* 读取Logo图片
*/
BufferedImage logo = ImageIO.read(logoPic);
/**
* 设置logo的大小,本人设置为二维码图片的20%,因为过大会盖掉二维码
*/
int widthLogo = logo.getWidth(null)>image.getWidth()*3/10?(image.getWidth()*3/10):logo.getWidth(null),
heightLogo = logo.getHeight(null)>image.getHeight()*3/10?(image.getHeight()*3/10):logo.getWidth(null);

/**
* logo放在中心
*/
int x = (image.getWidth() - widthLogo) / 2;
int y = (image.getHeight() - heightLogo) / 2;
/**
* logo放在右下角
*  int x = (image.getWidth() - widthLogo);
*  int y = (image.getHeight() - heightLogo);
*/

//开始绘制图片
g.drawImage(logo, x, y, widthLogo, heightLogo, null);
//            g.drawRoundRect(x, y, widthLogo, heightLogo, 15, 15);
//            g.setStroke(new BasicStroke(logoConfig.getBorder()));
//            g.setColor(logoConfig.getBorderColor());
//            g.drawRect(x, y, widthLogo, heightLogo);
g.dispose();

//把商品名称添加上去,商品名称不要太长哦,这里最多支持两行。太长就会自动截取啦
if (productName != null && !productName.equals("")) {
//新的图片,把带logo的二维码下面加上文字
BufferedImage outImage = new BufferedImage(400, 445, BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D outg = outImage.createGraphics();
//画二维码到新的面板
outg.drawImage(image, 0, 0, image.getWidth(), image.getHeight(), null);
//画文字到新的面板
outg.setColor(Color.BLACK);
outg.setFont(new Font("宋体",Font.BOLD,30)); //字体、字型、字号
int strWidth = outg.getFontMetrics().stringWidth(productName);
if (strWidth > 399) {
//                  //长度过长就截取前面部分
//                  outg.drawString(productName, 0, image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 5 ); //画文字
//长度过长就换行
String productName1 = productName.substring(0, productName.length()/2);
String productName2 = productName.substring(productName.length()/2, productName.length());
int strWidth1 = outg.getFontMetrics().stringWidth(productName1);
int strWidth2 = outg.getFontMetrics().stringWidth(productName2);
outg.drawString(productName1, 200  - strWidth1/2, image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 12 );
BufferedImage outImage2 = new BufferedImage(400, 485, BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D outg2 = outImage2.createGraphics();
outg2.drawImage(outImage, 0, 0, outImage.getWidth(), outImage.getHeight(), null);
outg2.setColor(Color.BLACK);
outg2.setFont(new Font("宋体",Font.BOLD,30)); //字体、字型、字号
outg2.drawString(productName2, 200  - strWidth2/2, outImage.getHeight() + (outImage2.getHeight() - outImage.getHeight())/2 + 5 );
outg2.dispose();
outImage2.flush();
outImage = outImage2;
}else {
outg.drawString(productName, 200  - strWidth/2 , image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 12 ); //画文字
}
outg.dispose();
outImage.flush();
image = outImage;
}
logo.flush();
image.flush();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
baos.flush();
ImageIO.write(image, "png", baos);

//二维码生成的路径,但是实际项目中,我们是把这生成的二维码显示到界面上的,因此下面的折行代码可以注释掉
//可以看到这个方法最终返回的是这个二维码的imageBase64字符串
//前端用 <img src="data:image/png;base64,${imageBase64QRCode}"/>  其中${imageBase64QRCode}对应二维码的imageBase64字符串
ImageIO.write(image, "png", new File("C:/Users/luoguohui/Desktop/TDC-" + new Date().getTime() + "test.png")); //TODO

String imageBase64QRCode =  Base64.encodeBase64URLSafeString(baos.toByteArray());

baos.close();
return imageBase64QRCode;
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}

/**
* 构建初始化二维码
*
* @param bm
* @return
*/
public BufferedImage fileToBufferedImage(BitMatrix bm)
{
BufferedImage image = null;
try
{
int w = bm.getWidth(), h = bm.getHeight();
image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

for (int x = 0; x < w; x++)
{
for (int y = 0; y < h; y++)
{
image.setRGB(x, y, bm.get(x, y) ? 0xFF000000 : 0xFFCCDDEE);
}
}

}
catch (Exception e)
{
e.printStackTrace();
}
return image;
}

/**
* 生成二维码bufferedImage图片
*
* @param content
*            编码内容
* @param barcodeFormat
*            编码类型
* @param width
*            图片宽度
* @param height
*            图片高度
* @param hints
*            设置参数
* @return
*/
public BufferedImage getQR_CODEBufferedImage(String content, BarcodeFormat barcodeFormat, int width, int height, Map<EncodeHintType, ?> hints)
{
MultiFormatWriter multiFormatWriter = null;
BitMatrix bm = null;
BufferedImage image = null;
try
{
multiFormatWriter = new MultiFormatWriter();
// 参数顺序分别为:编码内容,编码类型,生成图片宽度,生成图片高度,设置参数
bm = multiFormatWriter.encode(content, barcodeFormat, width, height, hints);
int w = bm.getWidth();
int h = bm.getHeight();
image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

// 开始利用二维码数据创建Bitmap图片,分别设为黑(0xFFFFFFFF)白(0xFF000000)两色
for (int x = 0; x < w; x++)
{
for (int y = 0; y < h; y++)
{
image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGWHITE);
}
}
}
catch (WriterException e)
{
e.printStackTrace();
}
return image;
}

/**
* 设置二维码的格式参数
*
* @return
*/
public Map<EncodeHintType, Object> getDecodeHintType()
{
// 用于设置QR二维码参数
Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
// 设置QR二维码的纠错级别(H为最高级别)具体级别信息
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
// 设置编码方式
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.MARGIN, 0);
hints.put(EncodeHintType.MAX_SIZE, 350);
hints.put(EncodeHintType.MIN_SIZE, 100);

return hints;
}
}

class LogoConfig
{
// logo默认边框颜色
public static final Color DEFAULT_BORDERCOLOR = Color.WHITE;
// logo默认边框宽度
public static final int DEFAULT_BORDER = 2;
// logo大小默认为照片的1/5
public static final int DEFAULT_LOGOPART = 5;

private final int border = DEFAULT_BORDER;
private final Color borderColor;
private final int logoPart;

/**
* Creates a default config with on color {@link #BLACK} and off color
* {@link #WHITE}, generating normal black-on-white barcodes.
*/
public LogoConfig()
{
this(DEFAULT_BORDERCOLOR, DEFAULT_LOGOPART);
}

public LogoConfig(Color borderColor, int logoPart)
{
this.borderColor = borderColor;
this.logoPart = logoPart;
}

public Color getBorderColor()
{
return borderColor;
}

public int getBorder()
{
return border;
}

public int getLogoPart()
{
return logoPart;
}
}


需要说明的是以上代码依赖了com.google.zxing和包含base64编码(commons-codec)这两个个插件,如果读者跟博主一样都是使用maven的话,添加下面依赖即可。

如果没有用maven的话,直接在http://maven.outofmemory.cn/com.google.zxing/core/3.1.0/ 下载。

<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.1.0</version>
</dependency>

<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.8</version>
</dependency>
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