不得不说,二维码的应用越来越广泛了。废话不多说了。。
此处采用的jar不多,只用zxing包里面的core.jar包即可,大家自行下载,
如果是百度云盘,地址为:http://pan.baidu.com/s/1eQeWFaq
以后很多的博客资源将会更新到这个地址中,大家尽量把资源转移自己的盘,防止链接某天突然挂了。
实例:
genQRCode(String content,String url),其中url绝对路径,就是这个类的调用方法,返回值二维码文件名,生成png格式(如需其他,自行更改),开头已经定义了图片大小为300*300
import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.io.OutputStream; import java.text.SimpleDateFormat; import java.util.Date; 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.WriterException; import com.google.zxing.common.BitMatrix; public class MatrixToImageWriter { private static final int BLACK = 0xFF000000; private static final int WHITE = 0xFFFFFFFF; private static final int WIDTH = 300; private static final int HEIGHT = 300; private MatrixToImageWriter() {} 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 void writeToFile(BitMatrix matrix, String format, File file)throws IOException { BufferedImage image = toBufferedImage(matrix); if (!ImageIO.write(image, format, file)) { throw new IOException("Could not write an image of format " + format + " to " + file); } } public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException { BufferedImage image = toBufferedImage(matrix); if (!ImageIO.write(image, format, stream)) { throw new IOException("Could not write an image of format " + format); } } //生成二维码图片content:内容 ,url:生成路径 public static String genQRCode(String content,String url){ //验证是否存在文件夹 CreateDir.createDir(url); String filename = null; //二维码的图片格式 String format = "png"; Hashtable hints = new Hashtable(); //内容所使用编码 hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); BitMatrix bitMatrix; try { bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, WIDTH, HEIGHT, hints); //生成名字,如果有自己的特有规则,以下3行自行更改 int s=(int)(Math.random()*10000);//整数类型 SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); filename = "file_" + sdf.format(new Date())+s +"." + format ; //生成二维码 File outputFile = new File(url+File.separator+filename); MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile); } catch (WriterException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return filename; } }
时间: 2024-10-12 08:42:59