java二维码生成的方法

package cn.huse.erweima;import java.io.File;import java.util.HashMap;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;import com.google.zxing.client.j2se.MatrixToImageWriter;import com.google.zxing.common.BitMatrix;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;public class CreateQRCode { public static void main(String[] args) { int width = 300; int height = 300;  String format = "gif"; String content = "www.baidu.com";  //定义二维码的参数 HashMap hints = new HashMap<>(); hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M); try {  BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height,hints);  File file = new File("e:"+File.separator+"new.gif");  MatrixToImageWriter.writeToFile(matrix, format, file); } catch (Exception e) {  e.printStackTrace(); } }}