第三方 access_token 缓存

缓存工具

package manager.common;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
 
 
public class LocalCacheClient {
    // 缓存map
    private static Map<String, Object> cacheMap = new HashMap<String, Object>();
    // 缓存有效期map
    private static Map<String, Long> expireTimeMap = new HashMap<String, Long>();
 
 
    /**
     * 获取指定的value，如果key不存在或者已过期，则返回null
     * @param key
     * @return
     */
    public static Object get(String key) {
        if (!cacheMap.containsKey(key)) {
            return null;
        }
        if (expireTimeMap.containsKey(key)) {
            if (expireTimeMap.get(key) < System.currentTimeMillis()) { // 缓存失效，已过期
                return null;
            }
        }
        return cacheMap.get(key);
    }
 
    /**
     * @param key
     * @param <T>
     * @return
     */
    public static <T> T getT(String key) {
        Object obj = get(key);
        return obj == null ? null : (T) obj;
    }
 
    /**
     * 设置value（不过期）
     * @param key
     * @param value
     */
    public static void set(String key, Object value) {
        cacheMap.put(key, value);
    }
 
    /**
     * 设置value
     * @param key
     * @param value
     * @param millSeconds 过期时间（毫秒）
     */
    public static void set(final String key, Object value, int millSeconds) {
        final long expireTime = System.currentTimeMillis() + millSeconds;
        cacheMap.put(key, value);
        expireTimeMap.put(key, expireTime);
        if (cacheMap.size() > 2) { // 清除过期数据
            new Thread(new Runnable() {
                public void run() {
                    // 此处若使用foreach进行循环遍历，删除过期数据，会抛出java.util.ConcurrentModificationException异常
                    Iterator<Map.Entry<String, Object>> iterator = cacheMap.entrySet().iterator();
                    while (iterator.hasNext()) {
                        Map.Entry<String, Object> entry = iterator.next();
                        if (expireTimeMap.containsKey(entry.getKey())) {
                            long expireTime = expireTimeMap.get(key);
                            if (System.currentTimeMillis() > expireTime) {
                                iterator.remove();
                                expireTimeMap.remove(entry.getKey());
                            }
                        }
                    }
                }
            }).start();
        }
    }
 
    /**
     * key是否存在
     * @param key
     * @return
     */
    public static boolean isExist(String key) {
        return cacheMap.containsKey(key);
    }
    
}

缓存实现(企业微信)

package manager.common;


import com.alibaba.fastjson.JSONObject;
import manager.constant.AccessToken;
import manager.util.http.HttpUtils;

public class WXAccessToken {

    public static final String corpid = "";
    public static final String corpsecret = "";
    // 获取access_token
    public static final String gettoken_url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken";

    public static String getAccessToken(){
        Object object = LocalCacheClient.get("access_token");
        if (object != null) {
            return object.toString();
        }
        String str = HttpUtils.sendGet(gettoken_url, "corpid=" + corpid + "&corpsecret=" + corpsecret);
        JSONObject jsonObject = JSONObject.parseObject(str);
        String errcode = jsonObject.get("errcode").toString();
        if (errcode.equals("0")){
            String access_token = jsonObject.get("access_token").toString();
            Integer expires_in = (Integer) jsonObject.get("expires_in");
            LocalCacheClient.set("access_token", access_token, expires_in * 1000);
            return access_token;
        }else {
            return null;
        }
    }


}