Java生成二维码

一、用maven导入相关依赖

    
      com.google.zxing
      core
      2.2
    

二、代码如下

package springboot.QRcode;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Hashtable;

public class QRCode {
	private static final int BLACK = 0xFF000000;
	private static final int WHITE = 0xFFFFFFFF;

	public static void main ( String[] args ) throws Exception
	{
		String text = "http://www.baidu.com"; //这里是URL ，扫描之后就跳转到这个界面
		text = "Hello World"; //扫描之后显示Hello World
		String path = "D:/"; //图片生成的位置
		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 ht = new Hashtable ();
		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,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 + "/erweima." + format)); //二维码的名称 是 erweima.sgif
	}
}