package test;

import java.util.List;

import java.util.ArrayList;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.HttpStatus;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.util.EntityUtils;

import com.google.gson.JsonObject;

import com.google.gson.JsonParser;

public class GetAccess_token {

    public static final String GET_TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token";// 获取access

    //public static final String GET_Base = "https://api.weixin.qq.com/cgi-bin/user/get";//// url

    public static final String APP_ID = "公众号appid";

    public static final String SECRET = "公众号SECRET";

    public static  String accessToken = null;

    // 获取token

    public static String getToken(String apiurl, String appid, String secret) {

        String turl = String.format(

                "%s?grant_type=client_credential&appid=%s&secret=%s", apiurl,

                appid, secret);

        HttpClient client = new DefaultHttpClient();

        HttpGet get = new HttpGet(turl);

        JsonParser jsonparer = new JsonParser();// 初始化解析json格式的对象

        String result = null;

        try {

            HttpResponse res = client.execute(get);

            String responseContent = null; // 响应内容

            HttpEntity entity = res.getEntity();

            responseContent = EntityUtils.toString(entity, "utf-8");

            JsonObject json = jsonparer.parse(responseContent)

                    .getAsJsonObject();

            // 将json字符串转换为json对象

            if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {

                if (json.get("errcode") != null) {// 错误时微信会返回错误码等信息，{"errcode":40013,"errmsg":"invalid appid"}

                } else {// 正常情况下{"access_token":"ACCESS_TOKEN","expires_in":7200}

                    result = json.get("access_token").getAsString();

                }

            }

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            // 关闭连接 ,释放资源

            client.getConnectionManager().shutdown();

        }return result;

    }

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

        System.out.println("=========1获取token=========");

         accessToken = getToken(GET_TOKEN_URL, APP_ID, SECRET);// 获取token

        if (accessToken != null){

            System.out.println("accessToken:" + accessToken);

        }

    }

}