JAVA生成二维码详解

最近有一新项目，用到了二维码，特写下来与大家分享。

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Date;

import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

public class QRCodeEncoderTest {
	
	public QRCodeEncoderTest() {
	}

	public static void create_image(String sms_info) throws Exception {
		try {
			Qrcode testQrcode = new Qrcode();
			testQrcode.setQrcodeErrorCorrect('M');
			testQrcode.setQrcodeEncodeMode('B');
			testQrcode.setQrcodeVersion(7);
			String testString = sms_info;
			byte[] d = testString.getBytes("gbk");
			System.out.println(d.length);
			// BufferedImage bi = new BufferedImage(98, 98,BufferedImage.TYPE_INT_RGB);
			BufferedImage bi = new BufferedImage(98, 98,
					BufferedImage.TYPE_BYTE_BINARY);
			Graphics2D g = bi.createGraphics();
			g.setBackground(Color.WHITE);
			g.clearRect(0, 0, 98, 98);
			g.setColor(Color.BLACK);
			// 限制最大字节数为120
			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 + 3, i * 2 + 3, 2, 2);
						}
					}
				}
			}
			g.dispose();
			bi.flush();
			File f = new File("D:\\" + sms_info + ".jpg");
			if (!f.exists()) {
				f.createNewFile();
			}
			// 创建图片 
			ImageIO.write(bi, "jpg", f);
		}
		catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) throws Exception {
		QRCodeEncoderTest.create_image("2013022221000001,编自XX银行信用卡进件需求。");
	}
}