获取通行令牌 简单demo

/**
 * 
 * @author Administrator
 *
 */
public class AccessToken {
    /** * access_token*/
    private final String access_token;
    /** * access_token time*/
    private final long expire_in;       // access_token有效时间，单位为妙

    /**
     * 
     * @param access_token access_token
     * @param expire_in expire_in
     */
    public AccessToken(String access_token, long expire_in)
    {
        this.access_token = access_token;
        this.expire_in = expire_in;
    }

    public String getAccess_token() {
        return access_token;
    }

    public long getExpire_in() {
        return expire_in;
    }
}

 

import java.io.IOException;
import net.sf.json.JSONObject;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
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 org.apache.log4j.Logger;

/**
 * 智慧校园 AccessTokenCache
 * @author Administrator
 *
 */
public class AccessTokenCache {
    

    /**
     * 记录日志
     */
    private static Logger LOGGER = Logger.getLogger(AccessTokenCache.class);
    
    /** * accessToken */
    private static volatile AccessToken ACCESSTOKEN;

    /** *  RefreshThread is run or stop */
    public static volatile boolean STARTED = false;
    /** * get accessToken url*/
    private static final String URL = System.getProperty("smp.smartcampus.accesstokenurl",
            "");
    /** * grant_type */
    private static final String GRANTTYPE = System.getProperty("smp.smartcampus.granttype",
            "");
    /** * client_id */
    private static final String CLIENTID = System.getProperty("smp.smartcampus.clientid",
            "");
    /** * client_secret */
    private static final String CLIENTSECRET = System.getProperty("smp.smartcampus.clientsecret",
            "");
    /**
     * 	
     * 
Description:              
     * 
Create Time: 2019-7-15   
     * @author Administrator
     * @return AccessToken
     */
    public static AccessToken getAccessToken() {
        if (ACCESSTOKEN == null) {
            ACCESSTOKEN = getToken();
        }
        //获取到的Accesstoken不为空， 并且更新线程未启动
        if (ACCESSTOKEN != null && !STARTED) {
            startRefreshThread();
        }
        return ACCESSTOKEN;
    }
    
    /**
     * 	
     * 
Description: 单独获取AccessToken  不启用线程         
     * 
Create Time: 2019-7-17   
     * @author Administrator
     * @return AccessToken
     */
    public static AccessToken getSingleAccessToken() {
        ACCESSTOKEN = getToken();
        return ACCESSTOKEN;
    }
    
    /**
     * 	
     * 
Description:              
     * 
Create Time: 2019-7-15   
     * @author Administrator
     * @param token token
     */
    public static void refreshAccessToken(AccessToken token) {
        if (token != null) {
            ACCESSTOKEN = token;
        } else {
            //TODO 记录日志
            LOGGER.error("get access_token failed");
        }
    }
    
    /**
     * 	
     * 
Description:              
     * 
Create Time: 2019-7-15   
     * @author Administrator
     */
    public static void stopRefreshThread() {
        STARTED = false;
    }
    
    /**
     * 	
     * 
Description:              
     * 
Create Time: 2019-7-15   
     * @author Administrator
     */
    public static void startRefreshThread() {
        if (STARTED) {
            return;
        }
        STARTED = true;
        //启动定时更新线程
        new Thread(new AccessTokenRefreshThread()).start();
    }

    /**
     * 	
     * 
Description:              
     * 
Create Time: 2019-7-15   
     * @author Administrator
     */
    public static void refreshAccessToken() {
            AccessToken token = getToken();
            refreshAccessToken(token);
    }
    
    /**
     * 	
     * 
Description:              
     * 
Create Time: 2019-7-15   
     * @author Administrator
     * @return AccessToken
     */
    private static AccessToken getToken() {
        
        try {
            return getTokenByCilent();
        }  catch (Exception e) {
            LOGGER.error("智慧校园 获取access_token 失败", e);
        }
		return null;
    }
    
    /**
     * 	
     * 
Description:              
     * 
Create Time: 2019-7-15   
     * @author Administrator
     * @return AccessToken
     */
    private static AccessToken getTokenByCilent()  {
        AccessToken accessToken = null;
        String response = "";
        String url = String.format("%s?grant_type=%s&client_id=%s&client_secret=%s",
                URL, GRANTTYPE, CLIENTID, CLIENTSECRET);
        
		int i=1;
		HttpGet post = new HttpGet(url);
	    HttpClient client = null;
	    HttpResponse httpResponse =null;
	    	client = new DefaultHttpClient();
	    	try {
				httpResponse = client.execute(post);
				response = EntityUtils.toString(httpResponse.getEntity());
			} catch (ClientProtocolException e) {
			} catch (IOException e) {
			}
/**
 * {
    "access_token": "AT-1-y2bUvRKfIP8VGDBGZ6t7JhZ4zeJy0gDf",
    "token_type": "bearer",
    "expires_in": 28800
}
 */
        JSONObject json = JSONObject.fromObject(response);
        if (json.has("access_token")) {
            String access_token = json.getString("access_token");
            String expires_in = json.getString("expires_in");
            accessToken = new AccessToken("Bearer " + access_token, Integer.valueOf(expires_in));
            LOGGER.error("智慧校园 获取access_token 成功");
        } else {
            LOGGER.error("智慧校园 获取access_token 失败,返回结果为:" + json);
        }
        return accessToken;
    }
    
    
    
    public static void main(String[] args) throws InterruptedException {
        System.out.println(AccessTokenCache.getAccessToken().getAccess_token());
        System.out.println(AccessTokenCache.getAccessToken().getAccess_token());
        System.out.println(AccessTokenCache.getAccessToken().getAccess_token());
        System.out.println(AccessTokenCache.getAccessToken().getAccess_token());
        System.out.println(AccessTokenCache.getAccessToken().getAccess_token());
        System.out.println(AccessTokenCache.getAccessToken().getAccess_token());
        System.out.println(AccessTokenCache.getAccessToken().getAccess_token());
        System.out.println(AccessTokenCache.getAccessToken().getAccess_token());
        System.out.println(AccessTokenCache.getAccessToken().getAccess_token());
        System.out.println(AccessTokenCache.getAccessToken().getAccess_token());
    }

    /**
     * AccessTokenRefreshThread
     * @author Administrator
     *
     */
    static class AccessTokenRefreshThread implements Runnable {
        public void run() {
            while (STARTED)
            {
                try {
                    if (null != ACCESSTOKEN) {
//                        Thread.sleep((10) * 1000);
                        Thread.sleep((ACCESSTOKEN.getExpire_in() / 2 ) * 1000);    // 休眠14400秒  4个小时
                    } else {
                        Thread.sleep(60 * 1000);    // 如果access_token为null，60秒后再获取
                    }
                } catch (InterruptedException e) {
                    try {
                        Thread.sleep(60 * 1000);
                    } catch (InterruptedException e1) {
                        LOGGER.error("AccessTokenRefreshThread", e);
                    }
                }
                //更新Accesstoken
                refreshAccessToken();
            }

        }
    }
}