Java 微信公众号导出所有粉丝(openId)

由于公众号换了公司主体，需要做迁移，玩家的openId数据需要做处理。

(我是按我要的json格式，将粉丝导成了1万条数据的一个json文件)

文件格式：

{

    "info":[

        {"openId":"ogVous494ltuNmO4zHb1seHeGLSk"}

    ]

}

package exportFansFromPublic;

import java.io.FileWriter;

import java.io.PrintWriter;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.JSONArray;

import com.alibaba.fastjson.JSONObject;

import com.odao.weixin.api.support.AccessTokenKit;

import com.odao.weixin.api.support.HttpKit;

/**

 * 导出公众号粉丝

 * @author wangfj

 */

public class ExportFansFromPublic {

    @SuppressWarnings({ "unchecked", "static-access","rawtypes"})

    public static void main(String[] args) throws Exception {

        String token = AccessTokenKit.getTokenNew("appId", "app秘钥");

        String accesstoken = (String) ((Map) JSON.parseObject(token, Map.class)).get("access_token");

        Map<String,String> params = new HashMap<String,String>();

        params.put("access_token", accesstoken);

        String nextOpenId = "";

        for(int i=1;i<=50;i++){ //我这了定的50，是根据公众号粉丝数量来的，一个文件一万条，你们自己算

            if(!"".equals(nextOpenId)){

                params.put("next_openid", nextOpenId);

            }

            //根据appId,appSecret获取数据粉丝openId(1次1万条)

            //格式：{"data"：{"openid":["oneOpenId,twoOpenId"]},"next_openid":"theNextOpenId"}

            try{

                String data = HttpKit.get("https://api.weixin.qq.com/cgi-bin/user/get",params);

                JSONObject json = (JSONObject) JSONObject.parse(data);

                String openId = json.get("data").toString();

                JSONObject open = (JSONObject) JSONObject.parse(openId);

                String openIds = open.get("openid").toString();

                JSONArray arr= JSONObject.parseArray(openIds);

                List<String> list = arr.toJavaObject(arr,  List.class);

                nextOpenId = writerJson(list,i);

            }catch(Exception e){

                System.out.println("导出完毕");

                break;

            }

        }

    }

    public static String writerJson(List<String> list,int fileName){

        String nextOpenId = "";

        FileWriter fw = null;

        PrintWriter out = null;

        try {

            // 指定生成txt的文件路径

            fw = new FileWriter("C:/Users/admin/Desktop/fan/"+fileName+".json");

            out = new PrintWriter(fw);

            out.println("{");

            out.println("\t\"info\":[");

            for(int i=0;i<list.size();i++){

                if(i!=list.size()-1){

                    out.println("\t\t{\"openId\":\""+list.get(i)+"\"},");

                }else{

                    nextOpenId = list.get(i);

                    out.println("\t\t{\"openId\":\""+list.get(i)+"\"}");

                }

            }

            out.println("\t]");

            out.println("}");

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            try {

                out.close();

                fw.close();

                out.flush();  // 由于此处用到了缓冲流，如果数据量过大，不进行flush操作，某些数据将依旧  存在于内从中而不会写入文件，此问题一定要注意

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

        return nextOpenId;

    }

}