access_token の長期有効性を保証する WeChat パブリック プラットフォームの開発方法

package org.liufeng.weixin.servlet;    
    
import javax.servlet.ServletException;    
import javax.servlet.http.HttpServlet;    
import org.liufeng.weixin.thread.TokenThread;    
import org.liufeng.weixin.util.WeixinUtil;    
import org.slf4j.Logger;    
import org.slf4j.LoggerFactory;    
    
/**  
 * 初始化servlet  
 *   
 * @author liuyq  
 * @date 2013-05-02  
 */    
public class InitServlet extends HttpServlet {    
    private static final long serialVersionUID = 1L;    
    private static Logger log = LoggerFactory.getLogger(WeixinUtil.class);    
    
    public void init() throws ServletException {    
        // 获取web.xml中配置的参数    
        TokenThread.appid = getInitParameter("appid");    
        TokenThread.appsecret = getInitParameter("appsecret");    
    
        log.info("weixin api appid:{}", TokenThread.appid);    
        log.info("weixin api appsecret:{}", TokenThread.appsecret);    
    
        // 未配置appid、appsecret时给出提示    
        if ("".equals(TokenThread.appid) || "".equals(TokenThread.appsecret)) {    
            log.error("appid and appsecret configuration error, please check carefully.");    
        } else {    
            // 启动定时获取access_token的线程    
            new Thread(new TokenThread()).start();    
        }    
    }    
}

<?xml version="1.0" encoding="UTF-8"?>    
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"    
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     
    <a href="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" "="">http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"</a>>    
    
    <servlet>    
        <servlet-name>initServlet</servlet-name>    
        <servlet-class>    
            org.liufeng.weixin.servlet.InitServlet    
        </servlet-class>    
        <!-- 配置获取access_token所需参数appid和appsecret -->    
        <init-param>    
            <param-name>appid</param-name>    
            <param-value>wx617a123bb8bc99cd</param-value>    
        </init-param>    
        <init-param>    
            <param-name>appsecret</param-name>    
            <param-value>4d82cbbbb08714c12345b62d7hn3dcb8</param-value>    
        </init-param>    
        <load-on-startup>0</load-on-startup>    
    </servlet>    
    
    <welcome-file-list>    
        <welcome-file>index.jsp</welcome-file>    
    </welcome-file-list>    
</web-app>

package org.liufeng.weixin.thread;    
    
import org.liufeng.weixin.pojo.AccessToken;    
import org.liufeng.weixin.util.WeixinUtil;    
import org.slf4j.Logger;    
import org.slf4j.LoggerFactory;    
    
/**  
 * 定时获取微信access_token的线程  
 *   
 * @author liuyq  
 * @date 2013-05-02  
 */    
public class TokenThread implements Runnable {    
    private static Logger log = LoggerFactory.getLogger(TokenThread.class);    
    // 第三方用户唯一凭证    
    public static String appid = "";    
    // 第三方用户唯一凭证密钥    
    public static String appsecret = "";    
    public static AccessToken accessToken = null;    
    
    public void run() {    
        while (true) {    
            try {    
                accessToken = WeixinUtil.getAccessToken(appid, appsecret);    
                if (null != accessToken) {    
                    log.info("获取access_token成功，有效时长{}秒 token:{}", accessToken.getExpiresIn(), accessToken.getToken());    
                    // 休眠7000秒    
                    Thread.sleep((accessToken.getExpiresIn() - 200) * 1000);    
                } else {    
                    // 如果access_token为null，60秒后再获取    
                    Thread.sleep(60 * 1000);    
                }    
            } catch (InterruptedException e) {    
                try {    
                    Thread.sleep(60 * 1000);    
                } catch (InterruptedException e1) {    
                    log.error("{}", e1);    
                }    
                log.error("{}", e);    
            }    
        }    
    }    
}

[INFO ] weixin api appid:wx617a123bb8bc99cd    
[INFO ] weixin api appsecret:4d82cbbbb08714c12345b62d7hn3dcb8    
[INFO ] 获取access_token成功，有效时长7200秒 token:sFopJ9lMmLl4u-ad61ojKpS0TolhN2s3SnHoI2Mh5GgdiYb35i-7DG2T2CDyQKMe