Java使用Google Zxing生成二维码的例子

时间:2022-05-20 22:27:48

以前只用过jQuery.qrcode生成过二维码,这次使用的是Google的zxing通过Java代码生成二维码并以流的方式输出到前台页面

所需jar包:zxing-3.2.1.jar

代码

前台展示页面

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<title>二维码</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src="http://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js"></script>
<style>
  body{text-align:center;}
</style>
</head>
<body>
  请输入关键字,多个关键字请用逗号隔开
  </br>
  </br>
  <textarea id="ids" cols="30" rows="10">
  </textarea>
  </br>
  <button onclick="submit1()" value="提交">提交</button>
  </br>
  </br>
  </br>
  <div id="img">
  
  </div>
  
  <script>
    function submit1() {
      var reg = new RegExp(",","g");//替换所有","
      var ids = $("#ids").val().replace(reg,",").split(",");
      var html = "<table align=\"center\">";
      for(var i = 0; i<ids.length; i++){
        html += "<tr><td>" + ids[i] + "</td></tr>"
        html += "<tr><td><img src=\"<%=basePath%>qrCode/generateOneqrCode/?id=" + ids[i] + "\" /></td></tr>";
      }
      html += "</table>";
      $("#img").html(html);
    }
  </script>
</body>
</html>

后台主要代码

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/**
   * 生成一个二维码
   * @param resp
   * @param id
   */
  @Override
  public void generateOneqrCode(HttpServletResponse resp, String id) {
    if (TextUtil.isNotEmpty(id)) {
      ServletOutputStream stream = null;
      try {
        int width = 200;//图片的宽度
        int height = 200;//图片的高度
        stream = resp.getOutputStream();
        QRCodeWriter writer = new QRCodeWriter();
        BitMatrix m = writer.encode(id, BarcodeFormat.QR_CODE, height, width);
        //以流的方式输出到前台,action中return null就可以
        MatrixToImageWriter.writeToStream(m, "png", stream);
      } catch (IOException e) {
        e.printStackTrace();
      } catch (WriterException e1) {
        e1.printStackTrace();
      } finally {
        if (stream != null) {
          try {
            stream.flush();
            stream.close();
          } catch (IOException e) {
            e.printStackTrace();
          }
        }
      }
    }
  }

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:https://segmentfault.com/a/1190000008523639