java生成二维码

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⓵怎么用java代码把一个链接生成二维码

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参考代码
importjava.io.*;
importjava.util.Date;
importjava.awt.*;
importjava.awt.image.*;
importjavax.imageio.*;
publicclassQRCodeEncoderTest
{
/**CreatesanewinstanceofQRCodeEncoderTest*/
publicQRCodeEncoderTest()
{
}
publicstaticvoidcreate_image(Stringsms_info)throwsException{
try{
qrcodetestQrcode=newqrcode();
testQrcode.setQrcodeErrorCorrect('M');
testQrcode.setQrcodeEncodeMode('B');
testQrcode.setQrcodeVersion(7);
StringtestString=sms_info;
byte[]d=testString.getBytes("gbk");
System.out.println(d.length);
//BufferedImagebi=newBufferedImage(98,98,BufferedImage.TYPE_INT_RGB);
BufferedImagebi=newBufferedImage(98,98,