生成二维码的工具类

import java.io.File;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.util.Hashtable;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCodeUtil {
   private static int margin = 0;               //白边大小，取值范围0~4
   private static ErrorCorrectionLevel level = ErrorCorrectionLevel.L; 
   /**
    * 生成二维码 保存至服务器
    * @param text 二维码内容
    * @param width 
    * @param height
    * @param filePath 保存服务器路径
    * @throws Exception
    */
   public static void generateQRCodeImage(String text, int width, int height, String filePath,String fileName) throws Exception {
      File f = new File(filePath);
      if (!f.exists()) {
         try {
               f.mkdirs();
         } catch (Exception e) {
               e.printStackTrace();
         }
      }
      Hashtable hints = new Hashtable();  
      // 指定纠错等级  
        hints.put(EncodeHintType.ERROR_CORRECTION, level);  
        // 指定编码格式  
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); 
        hints.put(EncodeHintType.MARGIN, margin);   //设置白边
      QRCodeWriter qrCodeWriter = new QRCodeWriter();
      
      BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height,hints);
      
      Path path = FileSystems.getDefault().getPath(filePath+fileName);
      
      MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path);
      
   }

}