Preface

The actual business scenario may require everyone under a label , Do some specified operations , So a tool class is created to get all the people under the tag

Code

    @Autowired
    private RestTemplate restTemplate;
    private  String smSpToken;
    /** *  Query everyone under the tag  * @param tag  label ID Required  * @return  Personnel in the label openid */
    public List<String> findUserByTag(int tag){
    
        ArrayList<String> openids = new ArrayList<>();
//  WeChat token
        String smSpToken="";
//  next ID The first one is empty by default 
        String openid="";
//  The number of cycles is more specific to how many people write your label   10000 people in a cycle 
        for (int i = 0; i < 40; i++) {
    
            System.out.println(" The first "+i);
            String url="https://api.weixin.qq.com/cgi-bin/user/tag/get?access_token="+smSpToken;
            TagWxUser tagWxUser = new TagWxUser();
            tagWxUser.setTagid(tag);
            tagWxUser.setNext_openid(openid);
            String param=JSON.toJSONString(tagWxUser);;
            System.out.println(param);
            // Custom sending method 
            String body = restTemplate.postForEntity(url, param, String.class).getBody();
            if(body.contains("errcode")){
    
                System.out.println(body);
                continue;
            }
            if(body!=null&&!"".equals(body)){
    
                JSONObject jsonObject =  JSONObject.fromObject(body);
                int count = jsonObject.getInt("count");
                if(count==0){
    
//  the last one ID The return value is 0
                    System.out.println(body);
                    System.out.println(" End of acquisition  "+i+" "+openids.size()+" %%"+" "+body);
                    break;
                }
//  Parse the return value 
                String next_openid = jsonObject.getString("next_openid");
                if(next_openid!=null&&!"".equals(next_openid)){
    
                    System.out.println(" next ："+next_openid);
                    openid=next_openid;
                    String data = jsonObject.getString("data");
                    if(data!=null&&!"".equals(data)){
    
                        JSONObject jsonObject2 =  JSONObject.fromObject(data);
                        String tagopenid = jsonObject2.getString("openid");
                        if(tagopenid!=null&&!"".equals(tagopenid)){
    
                            List<String> arr = JSON.parseArray(tagopenid, String.class);
                            if(arr!=null&&arr.size()>0){
    
                              openids.addAll(arr);
                            }
                        }
                    }

                }

            }

        }


        return openids;
    }