package com.happy.Unitil_nsh;


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;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

/**
 * 微信公众号接口工具类
 * @author lujunjie
 * @date   2018/03/01
 */
public class WxUtil {
	/**
	 * 生成支付二维码
	 * @param response 响应
	 * @param contents url链接
	 * @throws Exception
	 */
	public static void writerPayImage(HttpServletResponse response, String contents) throws Exception{
		ServletOutputStream out = response.getOutputStream();
		try {
			Map<EncodeHintType,Object> hints = new HashMap<EncodeHintType,Object>();
			hints.put(EncodeHintType.CHARACTER_SET,"UTF-8");
			hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
			hints.put(EncodeHintType.MARGIN, 0);
			BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE,300,300,hints);
			MatrixToImageWriter.writeToStream(bitMatrix,"jpg",out);
		}catch (Exception e){
			throw new Exception("生成二维码失败！");
		}finally {
			if(out != null){
				out.flush();
				out.close();
			}
		}
	}

}