Java中如何生成微信小程序太阳码-java教程-PHP中文网

实现方案

我们可以通过如下的方法实现小程序太阳码生成。

Java中如何生成微信小程序太阳码

生成有限制太阳码

实现步骤

获取小程序的access_token
设置path、with相关参数
调用getwxacodeunlimit接口,并将返回图片存储到本地

获取小程序的access_token

public static String getAccessToken(String appid, String appsecret)
    {
        String requestUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+appid+"&secret="+appsecret+"";
        String accessToken = null;
        try
        {
            String response = HttpClientUtil.getInstance().sendHttpsGet(
                    requestUrl, null);
            JSONObject json = JSONObject.parseObject(response);
            accessToken = String.valueOf(json.get("access_token"));
        }
        catch (Exception e)
        {
            logger.error("getAccessToken error", e);
        }

        return accessToken;
    }

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说明：调用微信API接口传入小程序的appid和appsecret参数即可。

调用微信api生成小程序太阳码

 public static String generatLimitSunCode(WxScanCodeParam param) throws Exception 
    {
       String token =param.getAccessToken();
       Map<String, String> params = new HashMap<>();
       params.put("path", param.getPath());
       params.put("width", "430");
       CloseableHttpClient httpClient = HttpClientBuilder.create().build();
       HttpPost httpPost = new HttpPost("https://api.weixin.qq.com/wxa/getwxacode?access_token="+token);
       httpPost.addHeader(HTTP.CONTENT_TYPE, "application/json");
       String body = JSON.toJSONString(params);
       StringEntity entity = new StringEntity(body);
       entity.setContentType("image/jpg");
       httpPost.setEntity(entity);
       HttpResponse response = httpClient.execute(httpPost);
       int statusCode = response.getStatusLine().getStatusCode();
       if (statusCode == HttpStatus.SC_OK) 
       {
           HttpEntity entity2 = response.getEntity();
           if(!entity2.getContentType().getValue().equals("image/jpeg"))
           {
               String result = EntityUtils.toString(entity2, "UTF-8");
               logger.error("generate sun code error,http execute result:" + result);
               return null;
           }
       }
       else
       {
           logger.error("generate sun code error,http execute result:" + statusCode);
       }
       
       InputStream inputStream = response.getEntity().getContent();
        // 保存图片到本地     
       int flag = saveImg(inputStream, param.getFilePath(), name);
       if (flag == 0)
       {
           throw new SysException("保存图片[" + name + "]失败");
       }
       else
       {
           logger.info("太阳码[{}]生成成功", name);
       }
       return param.getFilePath() + File.separatorChar + name;
   }

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说明

参数说明

path：扫码进入的小程序页面路径，最大长度 128 字节，不能为空；例如:pages/index/index
access_token：小程序授权token

注意事项

需要特殊注意,本方案生成的小程序太阳码与二维码的总数不能超过10万个，微信没有提供对应的Api接口查询的使用的数量，一旦超过了数量，将会导致小程序失效，且微信目前无法重置查询次数，适合于生成数量少的场景。

生成无限制太阳码

获取小程序的access_token

如同第一种的方案

调用微信api生成小程序太阳码

/**
     * 生成无限制的小程序码
     * @param param
     * @return
     * @throws Exception
     */
    public static String generatUnlimitSunCode(WxScanCodeParam param) throws Exception 
    {
       String token =param.getAccessToken();
       Map<String, String> params = new HashMap<>();
       params.put("scene", param.getScene());
       params.put("page", param.getPath());
       params.put("width", "430");
       CloseableHttpClient httpClient = HttpClientBuilder.create().build();
       HttpPost httpPost = new HttpPost("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+token);
       httpPost.addHeader(HTTP.CONTENT_TYPE, "application/json");
       String body = JSON.toJSONString(params);
       StringEntity entity = new StringEntity(body);
       entity.setContentType("image/jpg");
       httpPost.setEntity(entity);
       HttpResponse response = httpClient.execute(httpPost);
       int statusCode = response.getStatusLine().getStatusCode();
       if (statusCode == HttpStatus.SC_OK) 
       {
           HttpEntity entity2 = response.getEntity();
           if(!entity2.getContentType().getValue().equals("image/jpeg"))
           {
               String result = EntityUtils.toString(entity2, "UTF-8");
               logger.error("generate sun code error,http execute result:" + result);
               return null;
           }
       }
       else
       {
           logger.error("generate sun code error,http execute result:" + statusCode);
       }
       
       InputStream inputStream = response.getEntity().getContent();
       
       //太阳码写标题
       String content=param.getWriteContent();
       if(StringUtil.isNotEmpty(content) && param.isWrite())
       {
          inputStream = ImageUtil.addImageTitle(param.getWriteContent(), inputStream, 450, 450);
       }
      
       String name = param.getFileName()+".jpg";//文件名加后缀，跟上面对应
       

       int flag = saveImg(inputStream, param.getFilePath(), name);// 保存图片
       if (flag == 0)
       {
           throw new SysException("保存图片[" + name + "]失败");
       }
       else
       {
           logger.info("太阳码[{}]生成成功", name);
       }
       return param.getFilePath() + File.separatorChar + name;
   }

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