Java 生成二维码

1.java这边的话生成二维码有很多开发的jar包如zxing,qrcode.q前者是谷歌开发的后者则是小日本开发的，这里的话我使用zxing的开发包来弄


2.先下载zxing开发包，这里用到的只是core那个jar包


3.使用zxing开发还需要一个类，代码如下

01	package org.lxh;

02	import com.google.zxing.common.BitMatrix;

03

04	import javax.imageio.ImageIO;

05	import java.io.File;

06	import java.io.OutputStream;

07	import java.io.IOException;

08	import java.awt.image.BufferedImage;

09

10

11	public final class MatrixToImageWriter {

12

13	private static final int BLACK = 0xFF000000;

14	private static final int WHITE = 0xFFFFFFFF;

15

16	private MatrixToImageWriter() {}

17

18

19	public static BufferedImage toBufferedImage(BitMatrix matrix) {

20	int width = matrix.getWidth();

21	int height = matrix.getHeight();

22	BufferedImage image = newBufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

23	for (int x = 0; x < width; x++) {

24	for (int y = 0; y < height; y++) {

25	image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);

26

}

27

}

28	return image;

29

}

30

31

32	public static void writeToFile(BitMatrix matrix, String format, File file)

33	throws IOException {

34	BufferedImage image = toBufferedImage(matrix);

35	if (!ImageIO.write(image, format, file)) {

36	throw new IOException("Could not write an image of format "+ format + " to " + file);

37

}

38

}

39

40

41	public static voidwriteToStream(BitMatrix matrix, String format, OutputStream stream)

42	throws IOException {

43	BufferedImage image = toBufferedImage(matrix);

44	if (!ImageIO.write(image, format, stream)) {

45	throw new IOException("Could not write an image of format " + format);

46

}

47

}

48

49

}

4.借助上面的类生成二维码

01	package org.lxh;

02

03	import java.io.File;

04	import java.util.Hashtable;

05

06	import com.google.zxing.BarcodeFormat;

07	import com.google.zxing.EncodeHintType;

08	import com.google.zxing.MultiFormatWriter;

09	import com.google.zxing.WriterException;

10	import com.google.zxing.common.BitMatrix;

11

12	public class Test {

13

14

/**

15	* @param args

16	* @throws Exception

17

*/

18	public static void main(String[] args) throws Exception {

19	String text = "http://www.baidu.com";

20	int width = 300;

21	int height = 300;

22	//二维码的图片格式

23	String format = "gif";

24	Hashtable hints = new Hashtable();

25

//内容所使用编码

26	hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

27	BitMatrix bitMatrix = new MultiFormatWriter().encode(text,

28	BarcodeFormat.QR_CODE, width, height, hints);

29

//生成二维码

30	File outputFile = new File("d:"+File.separator+"new.gif");

31	MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);

32

33

}

34

35

}

text就是二维码的内容里这里可以使普通的文字也可以是链接，很简单吧最后把生成的二维码图片给大家