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 }
- 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 }
- 注
- 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。
- 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。