微信公众平台开发使用Java如何实现获取token

#获取到的appid
appid=wx7e32765bc24XXXX 
#获取到的AppSecret
AppSecret=d58051564fe9d86093f9XXXXX

package com.cuiyongzhi.wechat.util;
 
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.zip.GZIPInputStream;
 
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
 
/**
 * ClassName: HttpUtils
 * 
 * @Description: http请求工具类
 * @author dapengniao
 * @date 2016年3月10日 下午3:57:14
 */
@SuppressWarnings("deprecation")
public class HttpUtils {
 
 /**
  * @Description: http get请求共用方法
  * @param @param reqUrl
  * @param @param params
  * @param @return
  * @param @throws Exception
  * @author dapengniao
  * @date 2016年3月10日 下午3:57:39
  */
 @SuppressWarnings("resource")
 public static String sendGet(String reqUrl, Map<String, String> params)
   throws Exception {
  InputStream inputStream = null;
  HttpGet request = new HttpGet();
  try {
   String url = buildUrl(reqUrl, params);
   HttpClient client = new DefaultHttpClient();
 
   request.setHeader("Accept-Encoding", "gzip");
   request.setURI(new URI(url));
 
   HttpResponse response = client.execute(request);
 
   inputStream = response.getEntity().getContent();
   String result = getJsonStringFromGZIP(inputStream);
   return result;
  } finally {
   if (inputStream != null) {
    inputStream.close();
   }
   request.releaseConnection();
  }
 
 }
 
 /**
  * @Description: http post请求共用方法
  * @param @param reqUrl
  * @param @param params
  * @param @return
  * @param @throws Exception
  * @author dapengniao
  * @date 2016年3月10日 下午3:57:53
  */
 @SuppressWarnings("resource")
 public static String sendPost(String reqUrl, Map<String, String> params)
   throws Exception {
  try {
   Set<String> set = params.keySet();
   List<NameValuePair> list = new ArrayList<NameValuePair>();
   for (String key : set) {
    list.add(new BasicNameValuePair(key, params.get(key)));
   }
   if (list.size() > 0) {
    try {
     HttpClient client = new DefaultHttpClient();
     HttpPost request = new HttpPost(reqUrl);
 
     request.setHeader("Accept-Encoding", "gzip");
     request.setEntity(new UrlEncodedFormEntity(list, HTTP.UTF_8));
 
     HttpResponse response = client.execute(request);
 
     InputStream inputStream = response.getEntity().getContent();
     try {
      String result = getJsonStringFromGZIP(inputStream);
 
      return result;
     } finally {
      inputStream.close();
     }
    } catch (Exception ex) {
     ex.printStackTrace();
     throw new Exception("网络连接失败,请连接网络后再试");
    }
   } else {
    throw new Exception("参数不全，请稍后重试");
   }
  } catch (Exception ex) {
   ex.printStackTrace();
   throw new Exception("发送未知异常");
  }
 }
 
 /**
  * @Description: http post请求json数据
  * @param @param urls
  * @param @param params
  * @param @return
  * @param @throws ClientProtocolException
  * @param @throws IOException
  * @author dapengniao
  * @date 2016年3月10日 下午3:58:15
  */
 public static String sendPostBuffer(String urls, String params)
   throws ClientProtocolException, IOException {
  HttpPost request = new HttpPost(urls);
 
  StringEntity se = new StringEntity(params, HTTP.UTF_8);
  request.setEntity(se);
  // 发送请求
  @SuppressWarnings("resource")
  HttpResponse httpResponse = new DefaultHttpClient().execute(request);
  // 得到应答的字符串，这也是一个 JSON 格式保存的数据
  String retSrc = EntityUtils.toString(httpResponse.getEntity());
  request.releaseConnection();
  return retSrc;
 
 }
 
 /**
  * @Description: http请求发送xml内容
  * @param @param urlStr
  * @param @param xmlInfo
  * @param @return
  * @author dapengniao
  * @date 2016年3月10日 下午3:58:32
  */
 public static String sendXmlPost(String urlStr, String xmlInfo) {
  // xmlInfo xml具体字符串
 
  try {
   URL url = new URL(urlStr);
   URLConnection con = url.openConnection();
   con.setDoOutput(true);
   con.setRequestProperty("Pragma:", "no-cache");
   con.setRequestProperty("Cache-Control", "no-cache");
   con.setRequestProperty("Content-Type", "text/xml");
   OutputStreamWriter out = new OutputStreamWriter(
     con.getOutputStream());
   out.write(new String(xmlInfo.getBytes("utf-8")));
   out.flush();
   out.close();
   BufferedReader br = new BufferedReader(new InputStreamReader(
     con.getInputStream()));
   String lines = "";
   for (String line = br.readLine(); line != null; line = br
     .readLine()) {
    lines = lines + line;
   }
   return lines; // 返回请求结果
  } catch (MalformedURLException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
  return "fail";
 }
 
 private static String getJsonStringFromGZIP(InputStream is) {
  String jsonString = null;
  try {
   BufferedInputStream bis = new BufferedInputStream(is);
   bis.mark(2);
   // 取前两个字节
   byte[] header = new byte[2];
   int result = bis.read(header);
   // reset输入流到开始位置
   bis.reset();
   // 判断是否是GZIP格式
   int headerData = getShort(header);
   // Gzip 流 的前两个字节是 0x1f8b
   if (result != -1 && headerData == 0x1f8b) {
    // LogUtil.i("HttpTask", " use GZIPInputStream ");
    is = new GZIPInputStream(bis);
   } else {
    // LogUtil.d("HttpTask", " not use GZIPInputStream");
    is = bis;
   }
   InputStreamReader reader = new InputStreamReader(is, "utf-8");
   char[] data = new char[100];
   int readSize;
   StringBuffer sb = new StringBuffer();
   while ((readSize = reader.read(data)) > 0) {
    sb.append(data, 0, readSize);
   }
   jsonString = sb.toString();
   bis.close();
   reader.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
 
  return jsonString;
 }
 
 private static int getShort(byte[] data) {
  return (data[0] << 8) | data[1] & 0xFF;
 }
 
 /**
  * 构建get方式的url
  * 
  * @param reqUrl
  *   基础的url地址
  * @param params
  *   查询参数
  * @return 构建好的url
  */
 public static String buildUrl(String reqUrl, Map<String, String> params) {
  StringBuilder query = new StringBuilder();
  Set<String> set = params.keySet();
  for (String key : set) {
   query.append(String.format("%s=%s&", key, params.get(key)));
  }
  return reqUrl + "&#63;" + query.toString();
 }
 
}

#获取token的url
tokenUrl=https://api.weixin.qq.com/cgi-bin/token

package com.cuiyongzhi.web.start;
 
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
 
/**
 * ClassName: InterfaceUrlIntiServlet
 * @Description: 项目启动初始化servlet
 * @author dapengniao
 * @date 2016年3月10日 下午4:08:43
 */
public class InterfaceUrlIntiServlet extends HttpServlet {
 
 private static final long serialVersionUID = 1L;
 
 @Override
 public void init(ServletConfig config) throws ServletException {
  InterfaceUrlInti.init();
 }
 
}

package com.cuiyongzhi.web.start;
 
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
 
import com.cuiyongzhi.web.util.GlobalConstants;
 
/**
 * ClassName: InterfaceUrlInti
 * @Description: 项目启动初始化方法
 * @author dapengniao
 * @date 2016年3月10日 下午4:08:21
 */
public class InterfaceUrlInti {
 
 public synchronized static void init(){
  ClassLoader cl = Thread.currentThread().getContextClassLoader();
  Properties props = new Properties();
  if(GlobalConstants.interfaceUrlProperties==null){
   GlobalConstants.interfaceUrlProperties = new Properties();
  }
  InputStream in = null;
  try {
   in = cl.getResourceAsStream("interface_url.properties");
   props.load(in);
   for(Object key : props.keySet()){
    GlobalConstants.interfaceUrlProperties.put(key, props.get(key));
   }
    
   props = new Properties();
   in = cl.getResourceAsStream("wechat.properties");
   props.load(in);
   for(Object key : props.keySet()){
    GlobalConstants.interfaceUrlProperties.put(key, props.get(key));
   }
    
  } catch (IOException e) {
   e.printStackTrace();
  }finally{
   if(in!=null){
    try {
     in.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  }
  return;
 }
 
}

package com.cuiyongzhi.wechat.common;
 
import java.util.HashMap;
import java.util.Map;
 
import net.sf.json.JSONObject;
 
import com.cuiyongzhi.web.util.GlobalConstants;
import com.cuiyongzhi.wechat.util.HttpUtils;
 
/**
 * ClassName: WeChatTask
 * @Description: 微信两小时定时任务体
 * @author dapengniao
 * @date 2016年3月10日 下午1:42:29
 */
public class WeChatTask {
 /**
  * @Description: 任务执行体
  * @param @throws Exception
  * @author dapengniao
  * @date 2016年3月10日 下午2:04:37
  */
 public void getToken_getTicket() throws Exception {
  Map<String, String> params = new HashMap<String, String>();
  params.put("grant_type", "client_credential");
  params.put("appid", GlobalConstants.getInterfaceUrl("appid"));
  params.put("secret", GlobalConstants.getInterfaceUrl("AppSecret"));
  String jstoken = HttpUtils.sendGet(
    GlobalConstants.getInterfaceUrl("tokenUrl"), params);
  String access_token = JSONObject.fromObject(jstoken).getString(
    "access_token"); // 获取到token并赋值保存
  GlobalConstants.interfaceUrlProperties.put("access_token", access_token);
    System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())+"token为=============================="+access_token);
 }
 
}

package com.cuiyongzhi.wechat.quartz;
 
import org.apache.log4j.Logger;
 
import com.cuiyongzhi.wechat.common.WeChatTask;
 
public class QuartzJob{
  private static Logger logger = Logger.getLogger(QuartzJob.class);
  /**
   * @Description: 任务执行获取token
   * @param  
   * @author dapengniao
   * @date 2016年3月10日 下午4:34:26
   */
  public void workForToken() {
    try {
      WeChatTask timer = new WeChatTask();
      timer.getToken_getTicket();
    } catch (Exception e) {
      logger.error(e, e);
    }
  }
 
 
}

<&#63;xml version="1.0" encoding="UTF-8"&#63;>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
 
<beans>
 <!-- 要调用的工作类 -->
 <bean id="quartzJob" class="com.cuiyongzhi.wechat.quartz.QuartzJob"></bean>
  
 <!-- 定义调用对象和调用对象的方法 -->
 <bean id="jobtaskForToken"
  class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
  <!-- 调用的类 -->
  <property name="targetObject">
   <ref bean="quartzJob" />
  </property>
  <!-- 调用类中的方法 -->
  <property name="targetMethod">
   <value>workForToken</value>
  </property>
 
 </bean>
 <!-- 定义触发时间 -->
 <bean id="doTimeForToken" class="org.springframework.scheduling.quartz.CronTriggerBean">
  <property name="jobDetail">
   <ref bean="jobtaskForToken" />
  </property>
  <!-- cron表达式 -->
  <property name="cronExpression">
   <value>0 0/1 * * * &#63;</value>
  </property>
 </bean>
 
 
 <!-- 总管理类 如果将lazy-init='false'那么容器启动就会执行调度程序 -->
 <bean id="startQuertz" lazy-init="false" autowire="no"
  class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
  <property name="triggers">
   <list>
    <ref bean="doTimeForToken" />
   </list>
  </property>
 </bean>
 
</beans>

<context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:spring.xml,classpath:spring-mybatis.xml,classpath:spring-quartz.xml</param-value>
  <!-- ,classpath:spring-quartz.xml 用于做任务调度 任务定时都可以 -->
 </context-param>