maven 依賴：
使用google的zxing包
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.2.0</version>
</dependency>
工具類代碼：
package com.kaiyuan.kp.kyshop.app.twoDimensionCode;
import java.awt.BasicStroke;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
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;
/**
*
*二維碼生成工具類（ZXing）
*/
public class TwoDimensionCodeUtil {
/**
* 生成二維碼(ZXing)圖片 ，編碼默認UTF-8
* @param content 二維碼內容
* @param path 文件存儲路徑，不包括文件名稱
* @param fileName 文件名稱，不加後綴
* @param imageType 圖片類型
* @param width 寬度
* @param height 高度
*/
public static void encoderTwoDimensionCodeToFile(String content,String path,String fileName,String imageType,int width,int height){
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
Map<EncodeHintType,String> hints = new HashMap<EncodeHintType,String>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
try {
BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, width, height,hints);
Path filepath = new File(path+fileName+"."+imageType).toPath();
MatrixToImageWriter.writeToPath(bitMatrix, imageType, filepath);
} catch (Exception e){
e.printStackTrace();
}
}
/**
* 將二維碼輸出到流，編碼默認UTF-8
* @param content 二維碼內容
* @param imageType 圖片類型
* @param width 寬度
* @param height 高度
* @param out 輸出流
*/
public static void encoderTwoDimensionCodeToStream(String content,String imageType,int width,int height,OutputStream out){
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
Map<EncodeHintType,String> hints = new HashMap<EncodeHintType,String>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
try {
BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, width, height,hints);
MatrixToImageWriter.writeToStream(bitMatrix, imageType, out);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成帶logo的二維碼圖片流
* @param content
* @param imageType
* @param width
* @param height
* @param out
*/
public static void encoderLogoTwoDimensionCodeToStream(String content,String imageType,int width,int height,OutputStream out){
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
Map<EncodeHintType,String> hints = new HashMap<EncodeHintType,String>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
ByteArrayOutputStream o1 =new ByteArrayOutputStream();
try {
BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, width, height,hints);
MatrixToImageWriter.writeToStream(bitMatrix, imageType, o1);
} catch (Exception e) {
e.printStackTrace();
}
ByteArrayInputStream in = new ByteArrayInputStream(o1.toByteArray());
encoderLogoTwoDimensionCodeToStream( in, new File("d:/logo.jpg"), imageType, new LogoConfig(), out);
}
public static void encoderLogoTwoDimensionCodeToStream(InputStream in, File logoPic,String imageType, LogoConfig logoConfig,OutputStream out)
{
try
{
/**
* 讀取二維碼圖片，並構建繪圖對象
*/
BufferedImage image = ImageIO.read(in);
Graphics2D g = image.createGraphics();
/**
* 讀取Logo圖片
*/
BufferedImage logo = ImageIO.read(logoPic);
int widthLogo = logo.getWidth(), heightLogo = logo.getHeight();
// 計算圖片放置位置
int x = (image.getWidth() - widthLogo) / 2;
int y = (image.getHeight() - logo.getHeight()) / 2;
//開始繪製圖片
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();
ImageIO.write(image, imageType, out);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
使用方式：
String content = httpRequest.getParameter("content"); //二維碼映射的實際Url
String imageType = httpRequest.getParameter("imageType"); //圖片類型
int width = Integer.parseInt(httpRequest.getParameter("width")); //二維碼寬
int height = Integer.parseInt(httpRequest.getParameter("height")); //二維碼高
if (Strings.isNullOrEmpty(content)) {
LOGGER.warn("The content is null or empty");
return (T) new Result(StatusCodes.BAD_REQUEST, false);
}
httpResponse.setContentType("image/jpg");
try {
TwoDimensionCodeUtil.encoderTwoDimensionCodeToStream(content, imageType, width, height,
httpResponse.getOutputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
頁面使用返回的流：
html：
<img id="Img" src="" />
js：
var src = encodeURI("/twoDimensionCode/erweima?content=www.baidu.com&imageType=jpg&width=25&height=25");
$("#Img").attr("src",src);
$("#Img").attr("src",src);