二维码

我也是借鉴，做个记录方便以后

public class Code {

@SuppressWarnings("all")
public static void getEwm(String url){
int width = 300;
int height = 300;
// 设置生成二维格式的图片
String format = "jpeg";
Hashtable hints = new Hashtable<>();
// 二维码内容所使用编码
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix bitMatrix = null;
try {
bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, width, height,hints);
} catch (WriterException e) {
e.printStackTrace();
}
// 指定生成二维码图片的存放位置
String path = "d:" + File.separator + "new22.jpeg";
File outputFile = new File(path);
try {
MatriToImageWriter.writeTofile(bitMatrix, format, outputFile);
System.out.println("图片生成，请前往" + path + "查看...");
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("成功");
}
}

public class MatriToImageWriter {

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

private MatriToImageWriter() {}
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 + " to " + stream);
}
}
}

/** 主方法 */

public static void main(String[] args){

/** 生成二维码 */
Code.getEwm("https://www.baidu.com");

}