java获取微信accessToken的方法

package com.fengdi.lianmeng.task;import com.fengdi.lianmeng.common.CacheHelper;import com.fengdi.lianmeng.util.http.HttpRequest;import com.fengdi.lianmeng.util.tencent.CloudSignHelper;import com.fengdi.lianmeng.util.tencent.Interface;import net.sf.json.JSONObject;import org.quartz.JobExecutionContext;import org.slf4j.Logger;import org.slf4j.LoggerFactory;/** * 定时获取微信accessToken */public class GetWeiXinAccessTokenTask { private static Logger logger = LoggerFactory.getLogger(GetWeiXinAccessTokenTask.class); /** * 每90分钟，获取一次微信accessToken */ public void getWeiXinAccessToken (JobExecutionContext context){ try{  logger.info("获取微信定时AccessToken任务启动了");  //封装请求数据  String params = "grant_type=client_credential" +   "&secret=" + CloudSignHelper.wxspSecret + //小程序的 app_secret (在微信小程序管理后台获取)  "&appid="+ CloudSignHelper.appid;//小程序唯一标识appid (在微信小程序管理后台获取)  //发送GET请求  String result = HttpRequest.sendGet("https://api.weixin.qq.com/cgi-bin/token", params);  // 解析相应内容（转换成json对象）  JSONObject jsonObject = JSONObject.fromObject(result);  String accessToken = (String) jsonObject.get("access_token");  CacheHelper.put("wxAccessToken", accessToken);//将accessToken放入缓存，用的时候取就行  logger.info("获取微信定时AccessToken任务结束了"); }catch(Exception ex){  logger.error("获取微信定时AccessToken任务失败." , ex); } }}

public static String sendGet(String url, String param) {    String result = "";    BufferedReader in = null;    try {      String urlNameString = url + "?" + param;      URL realUrl = new URL(urlNameString);      // 打开和URL之间的连接      URLConnection connection = realUrl.openConnection();      // 设置通用的请求属性      connection.setRequestProperty("accept", "*/*");      connection.setRequestProperty("connection", "Keep-Alive");      connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");      // 建立实际的连接      connection.connect();      // 获取所有响应头字段      Map<String, List<String>> map = connection.getHeaderFields();      // 遍历所有的响应头字段      for (String key : map.keySet()) {        System.out.println(key + "--->" + map.get(key));      }      // 定义 BufferedReader输入流来读取URL的响应      in = new BufferedReader(new InputStreamReader(connection.getInputStream()));      String line;      while ((line = in.readLine()) != null) {        result += line;      }    } catch (Exception e) {      System.out.println("发送GET请求出现异常！" + e);      e.printStackTrace();    }    // 使用finally块来关闭输入流    finally {      try {        if (in != null) {          in.close();        }      } catch (Exception e2) {        e2.printStackTrace();      }    }    return result;  }