java中怎样用代码生成二维码？

参考代码

import java.io.*;
import java.util.Date;

import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;

public class QRCodeEncoderTest
{

/** Creates a new instance of 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:\\QRCodeTest\\"+sms_info+".jpg");
if(!f.exists()){
f.createNewFile();
}
//创建图片
ImageIO.write(bi, "jpg", f);

} // end try
catch (Exception e) {
e.printStackTrace();
} // end catch
}

public static void main(String[] args) throws Exception {
System.out.println(new Date());
for(int i =1; i < 100000; i ++){
QRCodeEncoderTest.create_image(i+"");
}
System.out.println(new Date());
} // end main
}