生成二维码

1 File file=new File("E://zxd.jpg");//这个路径必须存在,不然回报路径不存在的nul异常

2 （Qrcode）使用了 qrcode-1.0.jar 第三方 包
   （ImageIO）第二个jar就是jdK自带的 jre7\lib\rt.jar包
  javax.imageio.ImageIO

package com.zct.yfq.mgm.tools;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

public class CordeUtil2 {

	static int width = 90;
	static int height = 90;

	
	public static void main(String[] args) throws Exception {
 
		File file=new File("E://zxd.jpg");
		//encoderQRCoder("https://www.baidu.com/",file);
		encoderQRCoder("小黄人,这个周出于什么原因不去练车",file);
	}
	
	public static void encoderQRCoder(String sms_info,File file) throws Exception {
		try {
			Qrcode testQrcode = new Qrcode();
			testQrcode.setQrcodeErrorCorrect('M');
			testQrcode.setQrcodeEncodeMode('B');
			testQrcode.setQrcodeVersion(7);
			String testString = sms_info;
			byte[] d = testString.getBytes("utf-8");
			BufferedImage bi = new BufferedImage(width, height,
					BufferedImage.TYPE_BYTE_BINARY);
			Graphics2D g = bi.createGraphics();
			g.setBackground(Color.WHITE);
			g.clearRect(0, 0, width, height);
			g.setColor(Color.BLACK);

			// 限制最大字节数为119
			if (d.length > 0 && d.length < 120) {
				boolean[][] s = testQrcode.calQrcode(d);
				for (int i = 0; i < s.length; i++) {
					for (int j = 0; j < s.length; j++) {
						if (s[j][i]) {
							g.fillRect(j * 2, i * 2, 2, 2);
						}
					}
				}
			}
			g.dispose();
			bi.flush();
			ImageIO.write(bi, "jpg", file);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}