在如今的生活中，二维码随处可见，二维码的出现既减少了宣传纸张的浪费，又方便了人们的生活。这一篇我来说说 Java 利用第三方 Jar 包 zxing 生成二维码。
依赖
com.google.zxing core3.3.3 com.google.zxing javase3.3.3
生成二维码
package code;
import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.apache.commons.codec.binary.base64;
import org.apache.commons.codec.binary.base64OutputStream;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
public class QRCodeKit {
public static final String QRCODE_DEFAULT_CHARSET = "UTF-8";
public static final int QRCODE_DEFAULT_HEIGHT = 300;
public static final int QRCODE_DEFAULT_WIDTH = 300;
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
public static void main(String[] args) throws IOException, NotFoundException {
String data = "https://www.jianshu.com/p/748aa03cc1e8?ddd=dsdsdsdsddsdsdsdsdsdsdsdsd";
File logoFile = new File("C:/1.png");
BufferedImage image = QRCodeKit.createQRCodeWithLogo(data, logoFile);
ImageIO.write(image, "png", new File("D:/result7.png"));
System.out.println("done");
}
public static BufferedImage createQRCode(String data) {
return createQRCode(data, QRCODE_DEFAULT_WIDTH, QRCODE_DEFAULT_HEIGHT);
}
public static BufferedImage createQRCode(String data, int width, int height) {
return createQRCode(data, QRCODE_DEFAULT_CHARSET, width, height);
}
public static BufferedImage createQRCode(String data, String charset, int width, int height) {
Map hint = new HashMap();
hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hint.put(EncodeHintType.CHARACTER_SET, charset);
return createQRCode(data, charset, hint, width, height);
}
public static BufferedImage createQRCode(String data, String charset, Map hint, int width,
int height) {
BitMatrix matrix;
try {
matrix = new MultiFormatWriter().encode(new String(data.getBytes(charset), charset), BarcodeFormat.QR_CODE,
width, height, hint);
return toBufferedImage(matrix);
} catch (WriterException e) {
throw new RuntimeException(e.getMessage(), e);
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
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) ? BLACK : WHITE);
}
}
return image;
}
public static BufferedImage createQRCodeWithLogo(String data, File logoFile) {
return createQRCodeWithLogo(data, QRCODE_DEFAULT_WIDTH, QRCODE_DEFAULT_HEIGHT, logoFile);
}
public static BufferedImage createQRCodeWithLogo(String data, int width, int height, File logoFile) {
return createQRCodeWithLogo(data, QRCODE_DEFAULT_CHARSET, width, height, logoFile);
}
@SuppressWarnings({"unchecked", "rawtypes"})
public static BufferedImage createQRCodeWithLogo(String data, String charset, int width, int height, File logoFile) {
Map hint = new HashMap();
hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hint.put(EncodeHintType.CHARACTER_SET, charset);
hint.put(EncodeHintType.MARGIN, 2);
return createQRCodeWithLogo(data, charset, hint, width, height, logoFile);
}
public static BufferedImage createQRCodeWithLogo(String data, String charset, Map hint,
int width, int height, File logoFile) {
try {
BufferedImage qrcode = createQRCode(data, charset, hint, width, height);
BufferedImage logo = ImageIO.read(logoFile);
BufferedImage combined = new BufferedImage(height, width, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = (Graphics2D) combined.getGraphics();
//设置二维码大小，太大，会覆盖二维码，此处20%
int logoWidth = logo.getWidth() > qrcode.getWidth() * 2 / 10 ? (qrcode.getWidth() * 2 / 10) : logo.getWidth();
int logoHeight = logo.getHeight() > qrcode.getHeight() * 2 / 10 ? (qrcode.getHeight() * 2 / 10) : logo.getHeight();
//设置logo图片放置位置--中心
int x = Math.round((qrcode.getWidth() - logoWidth) / 2);
int y = Math.round((qrcode.getHeight() - logoHeight) / 2);
g.drawImage(qrcode, 0, 0, null);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1f));
//开始合并绘制图片
g.drawImage(logo, x, y, logoWidth, logoHeight, null);
g.drawRoundRect(x, y, logoWidth, logoHeight, 15, 15);
//logo边框大小
g.setStroke(new BasicStroke(3));
//logo边框颜色
g.setColor(Color.white);
g.drawRoundRect(x, y, logoWidth, logoHeight, 15, 15);
g.dispose();
logo.flush();
qrcode.flush();
return combined;
} catch (IOException e) {
throw new RuntimeException(e.getMessage(), e);
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
public static String getImagebase64String(BufferedImage image) {
String result = null;
try {
ByteArrayOutputStream os = new ByteArrayOutputStream();
OutputStream b64 = new base64OutputStream(os);
ImageIO.write(image, "png", b64);
result = os.toString("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e.getMessage(), e);
} catch (IOException e) {
throw new RuntimeException(e.getMessage(), e);
}
return result;
}
public static void convertbase64StringToImage(String base64ImageString, File file) {
FileOutputStream os;
try {
base64 d = new base64();
byte[] bs = d.decode(base64ImageString);
os = new FileOutputStream(file.getAbsolutePath());
os.write(bs);
os.close();
} catch (FileNotFoundException e) {
throw new RuntimeException(e.getMessage(), e);
} catch (IOException e) {
throw new RuntimeException(e.getMessage(), e);
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
}
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.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
import org.apache.commons.codec.binary.base64;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageConfig;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
public class ZXingCode {
public static void main(String[] args) throws WriterException {
try {
String logoPath = "F:/logo.jpg";
String logo_savePath = "F:/" + new Date().getTime() + ".png";
String str = toQRCode("http://blog.csdn.net/phil_jing", logoPath, logo_savePath, "CSDN博客");
System.out.println("finished zxing QRcode encode.");
System.out.println(Arrays.toString(base64.decodebase64(str)));
} catch (Exception e) {
e.printStackTrace();
}
}
public static String toQRCode(String content, String logoPath, String savePath, String remark) {
int width = 400, height = 400;
try {
BufferedImage bim = toBufferedImage(content, BarcodeFormat.QR_CODE, width, height, toDecodeHintType());
return encode(bim, logoPath, savePath, new LogoConfig(), remark);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private static String encode(BufferedImage bim, String logoPath, String savePath, LogoConfig logoConfig, String remark) {
ByteArrayOutputStream baos = null;
try {
BufferedImage image = bim;
if(StringUtils.isBlank(logoPath)){ //不需要添加logo
baos = new ByteArrayOutputStream();
baos.flush();
ImageIO.write(image, "png", baos);//流输出
//ImageIO.write(bim, "png", new File(savePath));//直接写入某路径，本地测试加上
return base64.encodebase64URLSafeString(baos.toByteArray());//Encodes binary data using a URL-safe variation of the base64 algorithm
}
Graphics2D g = image.createGraphics();
BufferedImage logo = ImageIO.read(new File(logoPath));
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);
int x = (image.getWidth() - widthLogo) / 2;
int y = (image.getHeight() - heightLogo) / 2;
// 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();
// 把备注添加上去，备注不要太长超过两行会自动截取
if ( StringUtils.isNotBlank(remark)){
// 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("微软雅黑", Font.BOLD, 30)); // 字体、字型、字号
int strWidth = outg.getFontMetrics().stringWidth(remark);
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
String productName1 = remark.substring(0, remark.length() / 2);
String productName2 = remark.substring(remark.length() / 2, remark.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("微软雅黑", 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(remark, 200 - strWidth / 2, image.getHeight() + (outImage.getHeight() - image.getHeight()) / 2 + 12); // 画文字
}
outg.dispose();
outImage.flush();
image = outImage;
}
logo.flush();
image.flush();
baos = new ByteArrayOutputStream();
baos.flush();
ImageIO.write(image, "png", baos); //不用MatrixToImageWriter
//ImageIO.write(image, "png", new File(savePath));//直接写入某路径
return base64.encodebase64URLSafeString(baos.toByteArray());
} catch (Exception e) {
e.printStackTrace();
} finally {
IOUtils.closeQuietly(baos);
}
return null;
}
private static BufferedImage toBufferedImage(String content, BarcodeFormat barcodeFormat, int width, int height,
Map hints) {
MultiFormatWriter multiFormatWriter = null;
BitMatrix bitMatrix = 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
bitMatrix = multiFormatWriter.encode(content, barcodeFormat, width, height, hints);
int w = bitMatrix.getWidth();
int h = bitMatrix.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, bitMatrix.get(x, y) ? MatrixToImageConfig.BLACK : MatrixToImageConfig.WHITE);
}
}
} catch (WriterException e) {
e.printStackTrace();
}
return image;
}
private static Map toDecodeHintType() {
// 用于设置QR二维码参数
Map hints = new HashMap();
// 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);//only applicable to Data Matrix now
//hints.put(EncodeHintType.MIN_SIZE, 100);//only applicable to Data Matrix now
return hints;
}
public static String decode(String imgPath) {
BufferedImage image = null;
Result result = null;
try {
File file = new File(imgPath);
image = ImageIO.read(file);
if (image == null) {
System.out.println("the decode image may be not exit.");
}
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Map hints = new HashMap();
hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
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;
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;
}
}
生成条形码
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
public class ZxingCode {
public static void encode(String contents, int width, int height, String imgPath) {
int codeWidth = 3 + // start guard
(7 * 6) + // left bars
+ // middle guard
(7 * 6) + // right bars
3; // end guard
codeWidth = Math.max(codeWidth, width);
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,BarcodeFormat.EAN_13, codeWidth, height, null);
MatrixToImageWriter.writeToFile(bitMatrix, "png", new File(imgPath));
} catch (Exception e) {
e.printStackTrace();
}
}
public static String decode(String imgPath) {
BufferedImage image = null;
Result result = null;
try {
image = ImageIO.read(new File(imgPath));
if (image == null) {
System.out.println("the decode image may be not exit.");
}
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
result = new MultiFormatReader().decode(bitmap, null);
return result.getText();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static void main(String[] args) {
String imgPath = "F:/zxing_EAN-13.png";
String contents = "6926557300360";
int width = 105, height = 50;
encode(contents, width, height, imgPath);
System.out.println("finished zxing EAN-13 encode.");
String decodeContent = decode(imgPath);
System.out.println("解码内容如下：" + decodeContent);
System.out.println("finished zxing EAN-13 decode.");
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。
