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

 1     /**
 2      * 输入自己的id跟密码，获取微信的安全密令字符串
 3      * @param APP_ID 
 4      * @param APPSECRET
 5      * @return
 6      */
 7     public static String getAccess_token( String APP_ID,String APPSECRET) {
 8         //设置变量 url与返回值其中url使用拼接带入参数APP_ID， APPSECRET
 9         String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="
10                 + APP_ID+ "&secret=" + APPSECRET;
11         String accessToken = null;
12         try {
13             //设置链接
14             URL urlGet = new URL(url);
15             //设置外网代理链接
16             InetSocketAddress addr = new InetSocketAddress("192.168.99.100",80);            
17              Proxy proxy = new Proxy(Proxy.Type.HTTP, addr); 
18              //启动链接
19             HttpURLConnection http = (HttpURLConnection) urlGet .openConnection(proxy);
20             //设置链接参数与要求
21             http.setRequestMethod("GET"); // 必须是get方式请求
22             http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
23             http.setDoOutput(true);
24             http.setDoInput(true);
25             System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30�?
26             System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30�?
27 //            链接
28             http.connect();
29             //获取返回值json字节流
30             InputStream is = http.getInputStream();
31             int size = is.available();
32             byte[] jsonBytes = new byte[size];
33             is.read(jsonBytes);
34             //转化成字符串
35             String message = new String(jsonBytes, "UTF-8");
36 //            转化成json对象然后返回accessToken属性的值
37             JSONObject demoJson =JSONObject.fromObject(message);
38             accessToken = demoJson.getString("access_token");
39             System.out.println(accessToken);
40             is.close();
41         } catch (Exception e) {
42             e.printStackTrace();
43         }
44         return accessToken;
45     }
46 
47 }