package com.xzx.gc.common.utils.image;
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import com.google.zxing.BarcodeFormat;
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import com.google.zxing.EncodeHintType;
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import com.google.zxing.MultiFormatWriter;
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import com.google.zxing.WriterException;
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import com.google.zxing.common.BitMatrix;
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import javax.servlet.http.HttpServletResponse;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* 生成二维码图片流
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*
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* @author zhu
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*
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*/
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public class QRCodeUtil {
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public static BitMatrix generateQRCodeStream(String content,HttpServletResponse response) {
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//给相应添加头部信息，主要告诉浏览器返回的是图片流
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response.setHeader("Cache-Control", "no-store");
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// 不设置缓存
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response.setHeader("Pragma", "no-cache");
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response.setDateHeader("Expires", 0);
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response.setContentType("image/png");
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//设置图片的文字编码以及内边框
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Map<EncodeHintType, Object> hints = new HashMap<>();
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//编码
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hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
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//边框距
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hints.put(EncodeHintType.MARGIN, 0);
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BitMatrix bitMatrix;
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try {
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//参数分别为：编码内容、编码类型、图片宽度、图片高度，设置参数
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bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 300, 300,hints);
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}catch(WriterException e) {
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e.printStackTrace();
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return null;
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}
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return bitMatrix;
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}
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}
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