需求：我们需要把订单信息生成二维码及有Logo 的二维码。
先看下效果图
提交订单
生成二维码
解析二维码
Zxing简介
本次我们使用优秀的开源利器– ZXing，相比而言它更加灵活方便，可以实现多种编码格式。
官网：http://code.google.com/p/zxing/
当然我们需要用到了源码中core和javase下面的相关的架包：
core-3.2.0.jar
javase-3.2.0.jar
都准备好了我们开始编写了。。。
代码编写
SpringMVC 配置可以看我的 SpringMVC 案例 ：
Java 实现图片水印之文字水印（SpringMVC + Jsp）
Java 实现图片水印之水印图片（SpringMVC + Jsp）
不多说了。。
1.先写Service类
生成二维码
CoderService.java
package com.wenteryan.service;import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;import org.springframework.stereotype.Service;import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;@Service
public class CoderService {
public String encode(String contents, int width, int height, String uploadPath, String realUploadPath, String imageName) {
//生成条形码时的一些配置
Map hints = new HashMap();
// 指定纠错等级,纠错级别（L 7%、M 15%、Q 25%、H 30%）
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
// 内容所使用字符集编码
hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); OutputStream out=null;
try {
if(realUploadPath!=null&&realUploadPath!=""){
out = new FileOutputStream(realUploadPath+"/"+imageName);
}
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
BitMatrix bitMatrix;
try {
// 生成二维码
bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);
MatrixToImageWriter.writeToStream(bitMatrix, "png", out);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return uploadPath+"/"+imageName ;
}
}
添加Logo
LogoConfig .java
package com.wenteryan.service;import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;import javax.imageio.ImageIO;import org.springframework.stereotype.Service;import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;@Service
public class LogoConfig {
public String LogoMatrix(File image, String uploadPath, String realUploadPath, String imgPath) {
/**
* 读取二维码图片，并构建绘图对象
*/ OutputStream os = null ;
String logoFileName = "logo_"+imgPath ;
try {
Image image2 = ImageIO.read(image) ;
int width = image2.getWidth(null) ;
int height = image2.getHeight(null) ;
BufferedImage bufferImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB) ;
//BufferedImage bufferImage =ImageIO.read(image) ;
Graphics2D g2 = bufferImage.createGraphics();
g2.drawImage(image2, 0, 0, width, height, null) ;
int matrixWidth = bufferImage.getWidth();
int matrixHeigh = bufferImage.getHeight(); //读取Logo图片
BufferedImage logo= ImageIO.read(new File(realUploadPath+"/"+"logo.jpg"));
//开始绘制图片
g2.drawImage(logo,matrixWidth/5*2,matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5, null);//绘制
BasicStroke stroke = new BasicStroke(5,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
g2.setStroke(stroke);// 设置笔画对象
//指定弧度的圆角矩形
RoundRectangle2D.Float round = new RoundRectangle2D.Float(matrixWidth/5*2, matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5,20,20);
g2.setColor(Color.white);
g2.draw(round);// 绘制圆弧矩形 //设置logo 有一道灰色边框
BasicStroke stroke2 = new BasicStroke(1,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
g2.setStroke(stroke2);// 设置笔画对象
RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(matrixWidth/5*2+2, matrixHeigh/5*2+2, matrixWidth/5-4, matrixHeigh/5-4,20,20);
g2.setColor(new Color(128,128,128));
g2.draw(round2);// 绘制圆弧矩形 g2.dispose(); bufferImage.flush() ;
os = new FileOutputStream(realUploadPath+"/"+logoFileName) ;
JPEGImageEncoder en = JPEGCodec.createJPEGEncoder(os) ;
en.encode(bufferImage) ; } catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if(os!=null) {
try {
os.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return uploadPath+"/"+logoFileName ;
}
}解码
ZxingDecoderService .java