java后台获取Access_token的工具方法

本方法主要通过java后台控制来获取Access_token，需要你已经知道自己的ID跟密码

因为微信的权限设置大概每天可以获取两千条,每条有效时间为2小时

     /**
      * 输入自己的id跟密码，获取微信的安全密令字符串
      * @param APP_ID
      * @param APPSECRET
      * @return
      */
     public static String getAccess_token( String APP_ID,String APPSECRET) {
         //设置变量 url与返回值其中url使用拼接带入参数APP_ID， APPSECRET
         String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="
                 + APP_ID+ "&secret=" + APPSECRET;
         String accessToken = null;
         try {
             //设置链接
             URL urlGet = new URL(url);
             //设置外网代理链接
             InetSocketAddress addr = new InetSocketAddress("192.168.99.100",80);
              Proxy proxy = new Proxy(Proxy.Type.HTTP, addr);
              //启动链接
             HttpURLConnection http = (HttpURLConnection) urlGet .openConnection(proxy);
             //设置链接参数与要求
             http.setRequestMethod("GET"); // 必须是get方式请求
             http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
             http.setDoOutput(true);
             http.setDoInput(true);
             System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30�?
             System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30�?
 //            链接
             http.connect();
             //获取返回值json字节流
             InputStream is = http.getInputStream();
             int size = is.available();
             byte[] jsonBytes = new byte[size];
             is.read(jsonBytes);
             //转化成字符串
             String message = new String(jsonBytes, "UTF-8");
 //            转化成json对象然后返回accessToken属性的值
             JSONObject demoJson =JSONObject.fromObject(message);
             accessToken = demoJson.getString("access_token");
             System.out.println(accessToken);
             is.close();
         } catch (Exception e) {
             e.printStackTrace();
         }
         return accessToken;
     }

 }