用Java搭建微信公众号（二）生成access_token

当自己的程序需要访问微信的HTTP接口时，需要传递access_token作为校验的参数。access_token需要通过APPID和APPSecret秘钥来生成，有效期是7200秒，2小时。access_token最好是做成全局变量共享，然后由一个线程定时去刷新，这样可以减少access_token生成的次数，微信服务器对access_token的生成次数有限制。

代码如下，首先是使用HttpClient来发送GET, POST请求的Util类，支持HTTPS

import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.List;import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;import org.apache.http.HttpEntity;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;public class WeixinHttpUtil {

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