java 生成二维码 代码实现

引入Zxing 的corn.jar 包就行了

import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
/*
 * 图片生成在D盘根目录下
 * */

public class test {

     private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;
    
        public static void main ( String[] args ) throws Exception
        {
            String text = "你好，世界。";
            String path = "D:/";
            int width = 900;
            int height = 900;
            // 二维码图片格式
            String format = "gif";
            // 设置编码，防止中文乱码
            Hashtable<EncodeHintType, Object> ht = new Hashtable<EncodeHintType, Object> ();
            ht.put (EncodeHintType.CHARACTER_SET, "UTF-8");
            // 设置二维码参数(编码内容，编码类型，图片宽度，图片高度, 编码格式)
            BitMatrix bitMatrix = new MultiFormatWriter ().encode (text, BarcodeFormat.QR_CODE, width, height, ht);
            // 生成二维码(定义二维码输出服务器路径)
            File outputFile = new File (path);
            if (!outputFile.exists ())
            {
                //创建文件夹
                outputFile.mkdir ();
            }
            int b_width = bitMatrix.getWidth ();
            int b_height = bitMatrix.getHeight ();
            // 建立图像缓冲器
            BufferedImage image = new BufferedImage (b_width, b_height, BufferedImage.TYPE_3BYTE_BGR);
            for ( int x = 0; x < b_width; x++ )
            {
                for ( int y = 0; y < b_height; y++ )
                {
                    image.setRGB (x, y, bitMatrix.get (x, y) ? BLACK : WHITE);
                }
            }
            // 生成二维码
            ImageIO.write (image, format, new File (path + "/qrcode." + format));
        }
}