Java将文件转换成二维码

生成二维码主要代码为在步骤1、2中，下边后续步骤3、4、5涉及到具体的业务。要是用该工具类时需要拷贝前两个步骤代码即可。

    com.google.zxing
    core
    3.3.3

public class QRCodeUtils {

    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    
    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();
        }
    }

    
    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");
}

@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;
    }

public interface SysQRCodeService {
    String getQRCode();
}

@RestController
@RequestMapping("/sys/QRCode")
public class SysQRCodeController {

    @Autowired
    SysQRCodeService sysQRCodeService;

    @RequestMapping()
    public AjaxResult getQRCode(){
        return AjaxResult.success(sysQRCodeService.getQRCode());
    }
}