The main code for generating a two-dimensional code is in steps 1 and 2, and the following steps 3, 4, and 5 involve specific services. If you use this tool class, you need to copy the code of the first two steps.
1. Introduce third-party dependencies for generating QR codes into the project pom.xml file
<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.3</version>
</dependency>
2. Tools for generating QR codes
/**
* 二维码生成工具
*/
public class QRCodeUtils {
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
/**
* 根据字符串生成对应的二维码图片png
* 大小:300*300
* <p>
* content：要转换的文字内容
* path：生成的二维码图片的绝对路径
* filename: 生成后的二维码图片的文件名
* Constants.SYS_HOME_QRCODE_FORMAT=“PNG”。我在外部常量类中定义的一个常量，即生成的二维码图片的格式
*/
public static void buildQuickMark(String content, String path, String filename) {
try {
BitMatrix byteMatrix = new MultiFormatWriter().encode(new String(content.getBytes(), "iso-8859-1"),
BarcodeFormat.QR_CODE, 300, 300);
String format = Constants.SYS_HOME_QRCODE_FORMAT;
File file = new File(path + "\\" + filename + "." + format);
BufferedImage image = toBufferedImage(byteMatrix);
if (!ImageIO.write(image, format, file)) {
throw new IOException("Could not write an image of format " + format + " to " + file);
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 设置二维码格式
*
* @param matrix
* @return
*/
private 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;
}
}
//测试将http://127.0.0.1:8888链接生成二维码
public static void main(String[] args) {
//设置图片内容
String content = "http://127.0.0.1:8888";
//设置图片存放位置
String path = "D:\\QRCode";
//设置生成的图片的名字
String filename = "test";
QRCodeUtils.buildQuickMark(content, path, filename);
System.out.println("创建成功");
}
3. The generated QR code image
4. The business layer code implementation class for generating the QR code
/**
* 二维码 业务层处理
*
* @author sense
*/
@Service
public class SysQRCodeServiceImpl implements SysQRCodeService {
@Autowired
SysConfigService sysConfigService;
public String getQRCode() {
return saveQRCode();
}
//将生成的二维码保存到服务器，并返回文件名
public String saveQRCode(){
//首先拿到系统配置中的要转换的二维码的值
String configValue = sysConfigService.selectConfigByKey(Constants.SYS_HOME_QRCODE).getConfigValue();
String qrCodeName = "QRCode";
//生成二维码图片
QRCodeUtils.buildQuickMark(configValue,uploadUrl(), qrCodeName);
String resultQRCodeName = qrCodeName+"."+Constants.SYS_HOME_QRCODE_FORMAT;
return resultQRCodeName;
}
//设置生成的二维码存放路径
public String uploadUrl() {
// 根据系统当前日期
Date now = new Date();
String date = new SimpleDateFormat("yyyyMM").format(now);
// 设置图片存放地址
String uploadFilePath = SenseConfig.getUploadFilePath();
// 判断是否存在地址，如果不存在，按照规则创建文件夹
File addr = new File(uploadFilePath);
if (!addr.exists()) {
addr.mkdirs();
}
return uploadFilePath;
}
5. Business layer code interface for generating QR code
public interface SysQRCodeService {
String getQRCode();
}
6. The interface for generating the QR code is called by the front-end to obtain the image name of the generated QR code
/**
* QRCode 生成二维码
*/
@RestController
@RequestMapping("/sys/QRCode")
public class SysQRCodeController {
@Autowired
SysQRCodeService sysQRCodeService;
@RequestMapping()
public AjaxResult getQRCode(){
return AjaxResult.success(sysQRCodeService.getQRCode());
}
}