微信小程序生成带参二维码

场景：实现微信小程序中的海报功能，海报中有一个通过扫码跳转到自己小程序的二维码，用户保存海报到本地在朋友圈分享后就可以通过扫码进入小程序。

  • 生成二维码工具类代码如下：
  1 package com.aone.foottalk.action.wx.util;
  2 
  3 import java.io.File;
  4 import java.io.FileOutputStream;
  5 //import java.io.IOException;
  6 import java.io.InputStream;
  7 import java.util.HashMap;
  8 import java.util.Map;
  9 
 10 //import org.apache.commons.io.IOUtils;
 11 import org.apache.http.HttpResponse;
 12 import org.apache.http.client.methods.HttpPost;
 13 import org.apache.http.entity.StringEntity;
 14 import org.apache.http.impl.client.CloseableHttpClient;
 15 import org.apache.http.impl.client.HttpClientBuilder;
 16 import org.apache.http.protocol.HTTP;
 17  
 18 import com.alibaba.fastjson.JSON;
 19 //import com.aone.foottalk.action.back.image.ImgTAction;
 20 //import com.aone.foottalk.common.QiniuUtil;
 21 
 22 import net.sf.json.JSONObject;
 23 /**
 24  * 二维码工具
 25  * @author 开发
 26  *
 27  */
 28 public class AUtil {
 29     
 30     public static String getminiqrQr(String neirong,String tzdz) throws Exception{
 31         String dizhi="";//返回给前端的地址
 32         /*************获取小程序token值*******************/
 33         String access_token ="";
 34         // 小程序(商城)
 35         String appId = "***************";
 36         String secret = "***************";
 37         String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appId + "&secret=" + secret;
 38         JSONObject json = CommonUtil.httpsRequest(url, "GET", null);
 39         if (null != json) {
 40             access_token=json.getString("access_token");
 41         }
 42         System.out.println("token"+access_token);
 43         /********************************/
 44         Map<String, Object> params = new HashMap<>();
 45         params.put("scene", neirong);
 46         params.put("page", "pages"+"/"+tzdz+"/"+tzdz);
 47         params.put("width", 430);
 48         
 49         CloseableHttpClient  httpClient = HttpClientBuilder.create().build();
 50         HttpPost httpPost = new HttpPost("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+access_token);
 51         httpPost.addHeader(HTTP.CONTENT_TYPE, "application/json");
 52         String body = JSON.toJSONString(params);
 53         StringEntity entity;
 54         entity = new StringEntity(body);
 55         entity.setContentType("image/png");
 56         httpPost.setEntity(entity);
 57         
 58         HttpResponse response;
 59         response = httpClient.execute(httpPost);
 60         InputStream inputStream = response.getEntity().getContent();
 61         /**===========================上传七牛==================================**/
 62         /*try {
 63             byte[] data = IOUtils.toByteArray(inputStream);
 64             Map<String, String> map = QiniuUtil.upload(data, neirong);
 65             String code = map.get("code");
 66             if ("200".equals(code)) {
 67                 System.out.println(map.get("path"));
 68                 dizhi=map.get("path");
 69                 System.out.println("地址："+dizhi);
 70             }
 71         } catch (IOException ex) {
 72             System.out.println(ImgTAction.class.getName() + "has thrown an exception: " + ex.getMessage());
 73         } finally {
 74             try {
 75                 inputStream.close();
 76             } catch (IOException ignored) {
 77 
 78             }
 79         }*/
 80         /**============================保存到本地=================================**/  
 81         File targetFile = new File("/photo");  
 82         if(!targetFile.exists()){    
 83             targetFile.mkdirs();    
 84         }       
 85         FileOutputStream out = new FileOutputStream("/888.png");
 86 
 87         byte[] buffer = new byte[8192];
 88         int bytesRead = 0;
 89         while((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {
 90             out.write(buffer, 0, bytesRead);
 91         }
 92         out.flush();
 93         out.close();
 94         return dizhi;
 95     }
 96     
 97     public static void main(String args[]){
 98         try {
 99             getminiqrQr("333","index");
100         } catch (Exception e) {
101             // TODO Auto-generated catch block
102             e.printStackTrace();
103         }
104     }
105 }
View Code
  • 通用工具类：
  1 package com.aone.foottalk.action.wx.util;
  2 
  3 import java.io.BufferedReader;
  4 import java.io.InputStream;
  5 import java.io.InputStreamReader;
  6 import java.io.OutputStream;
  7 import java.net.ConnectException;
  8 import java.net.URL;
  9 import java.util.Formatter;
 10 
 11 import javax.net.ssl.HttpsURLConnection;
 12 import javax.net.ssl.SSLContext;
 13 import javax.net.ssl.SSLSocketFactory;
 14 import javax.net.ssl.TrustManager;
 15 
 16 import net.sf.json.JSONObject;
 17 
 18 import org.slf4j.Logger;
 19 import org.slf4j.LoggerFactory;
 20 
 21 /**
 22  * 通用工具类
 23  * @author 开发
 24  *
 25  */
 26 public class CommonUtil {
 27     private static Logger log = LoggerFactory.getLogger(CommonUtil.class);
 28 
 29     // 凭证获取（GET）
 30     public final static String token_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
 31 
 32     /**
 33      * 发送https请求
 34      * 
 35      * @param requestUrl 请求地址
 36      * @param requestMethod 请求方式（GET、POST）
 37      * @param outputStr 提交的数据
 38      * @return JSONObject(通过JSONObject.get(key)的方式获取json对象的属性值)
 39      */
 40     public static JSONObject httpsRequest(String requestUrl, String requestMethod, String outputStr) {
 41         JSONObject jsonObject = null;
 42         try {
 43             // 创建SSLContext对象，并使用我们指定的信任管理器初始化
 44             TrustManager[] tm = { new MyX509TrustManager() };
 45             SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
 46             sslContext.init(null, tm, new java.security.SecureRandom());
 47             // 从上述SSLContext对象中得到SSLSocketFactory对象
 48             SSLSocketFactory ssf = sslContext.getSocketFactory();
 49 
 50             URL url = new URL(requestUrl);
 51             HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
 52             conn.setSSLSocketFactory(ssf);
 53             
 54             conn.setDoOutput(true);
 55             conn.setDoInput(true);
 56             conn.setUseCaches(false);
 57             // 设置请求方式（GET/POST）
 58             conn.setRequestMethod(requestMethod);
 59 
 60             // 当outputStr不为null时向输出流写数据
 61             if (null != outputStr) {
 62                 OutputStream outputStream = conn.getOutputStream();
 63                 // 注意编码格式
 64                 outputStream.write(outputStr.getBytes("UTF-8"));
 65                 outputStream.close();
 66             }
 67 
 68             // 从输入流读取返回内容
 69             InputStream inputStream = conn.getInputStream();
 70             InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
 71             BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
 72             String str = null;
 73             StringBuffer buffer = new StringBuffer();
 74             while ((str = bufferedReader.readLine()) != null) {
 75                 buffer.append(str);
 76             }
 77 
 78             // 释放资源
 79             bufferedReader.close();
 80             inputStreamReader.close();
 81             inputStream.close();
 82             inputStream = null;
 83             conn.disconnect();
 84             jsonObject = JSONObject.fromObject(buffer.toString());
 85         } catch (ConnectException ce) {
 86             log.error("连接超时：{}", ce);
 87         } catch (Exception e) {
 88             log.error("https请求异常：{}", e);
 89         }
 90         return jsonObject;
 91     }
 92     
 93     /**
 94      * 方法名：byteToHex</br>
 95      * 详述：字符串加密辅助方法 </br>
 96      * 开发人员：souvc  </br>
 97      * 创建时间：2016-1-5  </br>
 98      * @param hash
 99      * @return 说明返回值含义
100      * @throws 说明发生此异常的条件
101      */
102     public static String byteToHex(final byte[] hash) {
103         Formatter formatter = new Formatter();
104         for (byte b : hash) {
105             formatter.format("%02x", b);
106         }
107         String result = formatter.toString();
108         formatter.close();
109         return result;
110     }
111 }
View Code
  • 注
  1. 目前根据已发布小程序的appId与secret所获取的token可以下载到带参的二维码图片，但是没发布的没法得到小程序二维码图片。
  2. 小程序下载二维码需要https的图片地址，但是七牛目前是http的，图片保存地址需要处理。
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原文地址：https://www.cnblogs.com/LJing21/p/10191984.html