在上一家公司，生成二维码都是调用微信的接口，除了微信的接口还有其他的开源框架吗，应该有吧。带着这个疑问，找个云平台看看，现在云技术那么发达，如果可以的话，在调用一个二维码生成接口，也是可以的，不多这一个接口。
就在云平台社区里，还真找到了，看了几篇博文，开源框架google的Zxing非他莫属了。
二维码称为QR Code，QR全称Quick Response。下面直接上代码，看看在java语言里如何生成二维码的吧。
首先，在pom文件中引入zxing的两个架包：
<!--二维码生成架包引用-->
<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.3</version>
</dependency>
接着编写工具类，进行测试；
import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Hashtable;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
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.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* 二维码生成解析工具类
* @author 程就人生
* @date 2019年7月27日
* @Description
*
*/
public class QRCodeUtil {
//编码格式,采用utf-8
private static final String UNICODE = "utf-8";
//图片格式
private static final String FORMAT = "JPG";
//二维码宽度,单位：像素pixels
private static final int QRCODE_WIDTH = 300;
//二维码高度,单位：像素pixels
private static final int QRCODE_HEIGHT = 300;
//LOGO宽度,单位：像素pixels
private static final int LOGO_WIDTH = 100;
//LOGO高度,单位：像素pixels
private static final int LOGO_HEIGHT = 100;
/**
* 生成二维码图片
* @param content 二维码内容
* @param logoPath 图片地址
* @param needCompress 是否压缩
* @return
* @throws Exception
*/
private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, UNICODE);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_WIDTH, QRCODE_HEIGHT,
hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
if (logoPath == null || "".equals(logoPath)) {
return image;
}
// 插入图片
QRCodeUtil.insertImage(image, logoPath, needCompress);
return image;
}
/**
* 插入LOGO
* @param source 二维码图片
* @param logoPath LOGO图片地址
* @param needCompress 是否压缩
* @throws Exception
*/
private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception {
File file = new File(logoPath);
if (!file.exists()) {
throw new Exception("logo file not found.");
}
Image src = ImageIO.read(new File(logoPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > LOGO_WIDTH) {
width = LOGO_WIDTH;
}
if (height > LOGO_HEIGHT) {
height = LOGO_HEIGHT;
}
Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
g.dispose();
src = image;
}
// 插入LOGO
Graphics2D graph = source.createGraphics();
int x = (QRCODE_WIDTH - width) / 2;
int y = (QRCODE_HEIGHT - height) / 2;
graph.drawImage(src, x, y, width, height, null);
Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
graph.setStroke(new BasicStroke(3f));
graph.draw(shape);
graph.dispose();
}
/**
* 生成二维码(内嵌LOGO)
* 调用者指定二维码文件名
* @param content 二维码的内容
* @param logoPath 中间图片地址
* @param destPath 存储路径
* @param fileName 文件名称
* @param needCompress 是否压缩
* @return
* @throws Exception
*/
public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
mkdirs(destPath);
//文件名称通过传递
fileName = fileName.substring(0, fileName.indexOf(".")>0?fileName.indexOf("."):fileName.length())
+ "." + FORMAT.toLowerCase();
ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
return fileName;
}
/**
* 创建文件夹， mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
* @param destPath
*/
public static void mkdirs(String destPath) {
File file = new File(destPath);
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
}
/**
* 解析二维码
* @param path 二维码图片路径
* @return String 二维码内容
* @throws Exception
*/
public static String decode(String path) throws Exception {
File file = new File(path);
BufferedImage image = ImageIO.read(file);
if (image == null) {
return null;
}
BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result;
Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, UNICODE);
result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();
}
/**
* 测试
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
String text = "http://localhost:8001/login/aaa?bbb=ccc";
//不含Logo
QRCodeUtil.encode(text, null, "D:\\cc\\", "qrcode", true);
//含Logo，指定二维码图片名
QRCodeUtil.encode(text, "D:\\cloudfish\\app\\aa.jpg", "d:\\cc\\", "qrcode1", true);
System.out.println(QRCodeUtil.decode("d:\\cc\\qrcode1.jpg"));
}
}
最后，测试结果如下：
图-1
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