Java docking WeChat official account (1) to obtain token

1. Log in to the WeChat public platform, and obtain the AppId and AppSecret in the basic configuration

2. Get the token (the token is stored locally, and subsequent APIs must be accessed with the token)

You need to configure the ip whitelist in the basic configuration to get the token

    /** TokenURL */
    private final static String GET_TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}";

    /** APP_ID */
    private final static String APP_ID = "wx1234567891011121";

    /** APP_SECRET */
    private final static String APP_SECRET = "123qgs4vg5yt67vsf8r9bri1011j1i2b";


    /**
     * 获取token，默认7200秒过期，所以存redis7200秒取一次
     *
     * @return 获取用户详情
     */
    public String getToken() {
        String redisKey = "Tencent:AccessToken";
        String token  = (String)redisUtils.get(redisKey);
        if(ObjectUtils.isEmpty(token)){
            token = tencentService.getToken();
            //设置缓存 2小时
            redisUtils.setEx(redisKey,token, 7200, TimeUnit.SECONDS);
        }
        return token;
    }


    //tencentService.getToken();
    @Override
    public String  getToken(){
        try {
            HttpClient client = HttpClients.createDefault();
            String tokenUrl = MessageFormat.format(GET_TOKEN_URL, APP_ID, APP_SECRET);
            HttpGet request = new HttpGet(tokenUrl);
            HttpResponse response = client.execute(request);
            JSONObject object = getResponseJson(response);
            if (object == null) {
                return null;
            }
            return ObjectUtils.isEmpty(object) ? null : object.getString("access_token");
        }catch (Exception e){ log.info(e.getMessage()); }
        return null;
    }

    //getResponseJson();
    private static JSONObject getResponseJson(HttpResponse response) throws IOException {
        JSONObject json = null;
        HttpEntity entity = response.getEntity();
        if(entity!=null){
            String result = EntityUtils.toString(entity,"UTF-8");
            json = JSONObject.parseObject(result);
        }
        if(ObjectUtils.isEmpty(json)){
            return null;
        }
        return json;
    }

//可能用到的包
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.toolkit.ObjectUtils;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.MessageFormat;
import java.util.Date;
import java.util.Map;