<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.1.0</version>
</dependency>
方法一
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
public class QRCodeParams {
private String txt; //二维码内容
private String qrCodeUrl; //二维码网络路径
private String filePath; //二维码生成物理路径
private String fileName; //二维码生成图片名称（包含后缀名）
private String logoPath; //logo图片
private Integer width = 300; //二维码宽度
private Integer height = 300; //二维码高度
private Integer onColor = 0xFF000000; //前景色
private Integer offColor = 0xFFFFFFFF; //背景色
private Integer margin = 1; //白边大小，取值范围0~4
private ErrorCorrectionLevel level = ErrorCorrectionLevel.L; //二维码容错率
public String getTxt() {
return txt;
}
public void setTxt(String txt) {
this.txt = txt;
}
public String getFilePath() {
return filePath;
}
public void setFilePath(String filePath) {
this.filePath = filePath;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public Integer getWidth() {
return width;
}
public void setWidth(Integer width) {
this.width = width;
}
public Integer getHeight() {
return height;
}
public void setHeight(Integer height) {
this.height = height;
}
public String getQrCodeUrl() {
return qrCodeUrl;
}
public void setQrCodeUrl(String qrCodeUrl) {
this.qrCodeUrl = qrCodeUrl;
}
public String getLogoPath() {
return logoPath;
}
public void setLogoPath(String logoPath) {
this.logoPath = logoPath;
}
public Integer getOnColor() {
return onColor;
}
public void setOnColor(Integer onColor) {
this.onColor = onColor;
}
public Integer getOffColor() {
return offColor;
}
public void setOffColor(Integer offColor) {
this.offColor = offColor;
}
public ErrorCorrectionLevel getLevel() {
return level;
}
public void setLevel(ErrorCorrectionLevel level) {
this.level = level;
}
/**
* 返回文件后缀名
* @return
*/
public String getSuffixName(){
String imgName = this.getFileName();
if(imgName != null && !"".equals(imgName)){
String suffix=fileName.substring(fileName.lastIndexOf(".")+1);
return suffix;
}
return "";
}
public Integer getMargin() {
return margin;
}
public void setMargin(Integer margin) {
this.margin = margin;
}
}
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
import javax.imageio.ImageIO;
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 com.google.zxing.client.j2se.MatrixToImageConfig;
import com.google.zxing.client.j2se.MatrixToImageWriter;
public class QRCodeUtil {
private static int width = 300; //二维码宽度
private static int height = 300; //二维码高度
private static int onColor = 0xFF000000; //前景色
private static int offColor = 0xFFFFFFFF; //背景色
private static int margin = 1; //白边大小，取值范围0~4
private static ErrorCorrectionLevel level = ErrorCorrectionLevel.L; //二维码容错率
/**
* 生成二维码
*
* @param params QRCodeParams属性：txt、fileName、filePath不得为空；
* @throws QRParamsException
*/
public static void generateQRImage(QRCodeParams params) throws QRParamsException {
if (params == null
|| params.getFileName() == null
|| params.getFilePath() == null
|| params.getTxt() == null) {
throw new QRParamsException("参数错误");
}
try {
initData(params);
String imgPath = params.getFilePath();
String imgName = params.getFileName();
String txt = params.getTxt();
if (params.getLogoPath() != null && !"".equals(params.getLogoPath().trim())) {
generateQRImage(txt, params.getLogoPath(), imgPath, imgName, params.getSuffixName());
} else {
generateQRImage(txt, imgPath, imgName, params.getSuffixName());
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成二维码
*
* @param txt //二维码内容
* @param imgPath //二维码保存物理路径
* @param imgName //二维码文件名称
* @param suffix //图片后缀名
*/
public static void generateQRImage(String txt, String imgPath, String imgName, String suffix) {
File filePath = new File(imgPath);
if (!filePath.exists()) {
filePath.mkdirs();
}
File imageFile = new File(imgPath, imgName);
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
// 指定纠错等级
hints.put(EncodeHintType.ERROR_CORRECTION, level);
// 指定编码格式
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
hints.put(EncodeHintType.MARGIN, margin); //设置白边
try {
MatrixToImageConfig config = new MatrixToImageConfig(onColor, offColor);
BitMatrix bitMatrix = new MultiFormatWriter().encode(txt, BarcodeFormat.QR_CODE, width, height, hints);
// bitMatrix = deleteWhite(bitMatrix);
MatrixToImageWriter.writeToPath(bitMatrix, suffix, imageFile.toPath(), config);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成带logo的二维码图片
*
* @param txt //二维码内容
* @param logoPath //logo绝对物理路径
* @param imgPath //二维码保存绝对物理路径
* @param imgName //二维码文件名称
* @param suffix //图片后缀名
* @throws Exception
*/
public static void generateQRImage(String txt, String logoPath, String imgPath, String imgName, String suffix) throws Exception {
File filePath = new File(imgPath);
if (!filePath.exists()) {
filePath.mkdirs();
}
if (imgPath.endsWith("/")) {
imgPath += imgName;
} else {
imgPath += "/" + imgName;
}
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION, level);
hints.put(EncodeHintType.MARGIN, margin); //设置白边
BitMatrix bitMatrix = new MultiFormatWriter().encode(txt, BarcodeFormat.QR_CODE, width, height, hints);
File qrcodeFile = new File(imgPath);
writeToFile(bitMatrix, suffix, qrcodeFile, logoPath);
}
/**
* @param matrix 二维码矩阵相关
* @param format 二维码图片格式
* @param file 二维码图片文件
* @param logoPath logo路径
* @throws IOException
*/
public static void writeToFile(BitMatrix matrix, String format, File file, String logoPath) throws IOException {
BufferedImage image = toBufferedImage(matrix);
Graphics2D gs = image.createGraphics();
int ratioWidth = image.getWidth() * 2 / 10;
int ratioHeight = image.getHeight() * 2 / 10;
//载入logo
Image img = ImageIO.read(new File(logoPath));
int logoWidth = img.getWidth(null) > ratioWidth ? ratioWidth : img.getWidth(null);
int logoHeight = img.getHeight(null) > ratioHeight ? ratioHeight : img.getHeight(null);
int x = (image.getWidth() - logoWidth) / 2;
int y = (image.getHeight() - logoHeight) / 2;
gs.drawImage(img, x, y, logoWidth, logoHeight, null);
gs.setColor(Color.black);
gs.setBackground(Color.WHITE);
gs.dispose();
img.flush();
if (!ImageIO.write(image, format, file)) {
throw new IOException("Could not write an image of format " + format + " to " + file);
}
}
public static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, matrix.get(x, y) ? onColor : offColor);
}
}
return image;
}
public static BitMatrix deleteWhite(BitMatrix matrix) {
int[] rec = matrix.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 (matrix.get(i + rec[0], j + rec[1]))
resMatrix.set(i, j);
}
}
return resMatrix;
}
private static void initData(QRCodeParams params) {
if (params.getWidth() != null) {
width = params.getWidth();
}
if (params.getHeight() != null) {
height = params.getHeight();
}
if (params.getOnColor() != null) {
onColor = params.getOnColor();
}
if (params.getOffColor() != null) {
offColor = params.getOffColor();
}
if (params.getLevel() != null) {
level = params.getLevel();
}
}
}
public class QRParamsException extends Exception {
private static final long serialVersionUID = 8837582301762730656L;
public QRParamsException() {} //用来创建无参数对象
public QRParamsException(String message) { //用来创建指定参数对象
super(message); //调用超类构造器
}
}
方法二
public static void creatRrCode(String contents, int width, int height, HttpServletResponse response) {
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //容错级别最高
hints.put( EncodeHintType.CHARACTER_SET, "utf-8"); //设置字符编码
hints.put(EncodeHintType.MARGIN, 1);//二维码空白区域,最小为0也有白边,只是很小,最小是6像素左右
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints); // 1、读取文件转换为字节数组
// ByteArrayOutputStream out = new ByteArrayOutputStream();
BufferedImage image = toBufferedImage(bitMatrix);
//转换成png格式的IO流
ImageIO.write(image, "png", response.getOutputStream());
// byte[] bytes = out.toByteArray();
// // 2、将字节数组转为二进制
// BASE64Encoder encoder = new BASE64Encoder();
// binary = encoder.encodeBuffer(bytes).trim();
} catch (WriterException e) { // TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* image流数据处理
*
* @author ianly
*/
public static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, matrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
return image;
}
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