1 package com.wyl.sms;
 2
 3 import java.io.IOException;
 4
 5 import com.wyl.http.UtilHttp;
 6
 7 public class UtilSMS {
 8     private static String APP_ID = "你自己的appid";
 9     private static String APP_SECRET = "你自己的secret";
10     //获取访问令牌的接口地址  ，详见 http://open.189.cn/index.php?m=content&c=index&a=lists&catid=62 接口文档
11     private static String URL_GET_TOKEN = "https://oauth.api.189.cn/emp/oauth2/v3/access_token";
12
13
14     /**
15      * 组装参数
16      * 详见：http://open.189.cn/index.php?m=content&c=index&a=lists&catid=62
17      * @param refresh_token
18      * @param app_id
19      * @param app_secret
20      * @param state
21      * @return
22      */
23     @SuppressWarnings("all")
24     private static String buildPara(String app_id,String app_secret,String state){
25         StringBuilder entity = new StringBuilder();
26         entity.append("grant_type="+"client_credentials");
27         entity.append("&app_id="+app_id);
28         entity.append("&app_secret="+app_secret);
29         entity.append("&state="+state);
30         return entity.toString();
31     }
32     /**
33      * 获取访问令牌
34      * @return 返回电信服务器返回的json格式的token等信息
35      * @throws IOException
36      */
37     public static String getAccessToken() throws IOException{
38         String weburl = URL_GET_TOKEN+"?"+buildPara(APP_ID, APP_SECRET, "320");
39         String token = UtilHttp.sendPostRequest(weburl);
40         return token;
41     }
42     /**
43      * 正常获取到token
44      * @param args
45      * @throws IOException
46      */
47     public static void main(String[] args) throws IOException {
48         System.out.println("token:"+getAccessToken());
49     }
50 }

 1 package com.wyl.http;
 2
 3 import java.io.BufferedReader;
 4 import java.io.IOException;
 5 import java.io.InputStreamReader;
 6 import java.net.HttpURLConnection;
 7 import java.net.URL;
 8
 9 public class UtilHttp {
10     public UtilHttp(){
11
12     }
13     /**
14      * 根据传入的url地址，发送post请求
15      * @param weburl
16      * @return 返回请求返回的数据，转换成String
17      * @throws IOException
18      */
19     public static String sendPostRequest(String weburl) throws IOException{
20         URL url = new URL(weburl);
21         HttpURLConnection conn = (HttpURLConnection)url.openConnection();
22         conn.setDoInput(true);
23         conn.setDoOutput(true);
24         conn.setRequestMethod("POST");
25         conn.connect();
26         BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
27         String line;
28         StringBuilder builder = new StringBuilder();
29         while ((line = reader.readLine())!=null) {
30             builder.append(line);
31         }
32         return (builder.toString()==null?"":builder.toString());
33     }
34 }