package com.jredu.util;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
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.util.EntityUtils;
import com.jredu.entity.AccessToken;
import net.sf.json.JSONObject;public class WeiXinUtil {//从微信后台拿到APPID和APPSECRET 并封装为常量private static final String APPID = "wxe09763a06d980f09";private static final String APPSECRET = "3a6005a4c7589ca9e93297c72f7eaf4d";private static final String ACCESS_TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";/*** 编写Get请求的方法。但没有参数传递的时候，可以使用Get请求* * @param url 需要请求的URL* @return 将请求URL后返回的数据，转为JSON格式，并return*/public static JSONObject doGetStr(String url) throws ClientProtocolException, IOException {DefaultHttpClient client = new DefaultHttpClient();//获取DefaultHttpClient请求HttpGet httpGet = new HttpGet(url);//HttpGet将使用Get方式发送请求URLJSONObject jsonObject = null;HttpResponse response = client.execute(httpGet);//使用HttpResponse接收client执行httpGet的结果HttpEntity entity = response.getEntity();//从response中获取结果，类型为HttpEntityif(entity != null){String result = EntityUtils.toString(entity,"UTF-8");//HttpEntity转为字符串类型jsonObject = JSONObject.fromObject(result);//字符串类型转为JSON类型
        }return jsonObject;}/*** 编写Post请求的方法。当我们需要参数传递的时候，可以使用Post请求* * @param url 需要请求的URL* @param outStr  需要传递的参数* @return 将请求URL后返回的数据，转为JSON格式，并return*/public static JSONObject doPostStr(String url,String outStr) throws ClientProtocolException, IOException {DefaultHttpClient client = new DefaultHttpClient();//获取DefaultHttpClient请求HttpPost httpost = new HttpPost(url);//HttpPost将使用Get方式发送请求URLJSONObject jsonObject = null;httpost.setEntity(new StringEntity(outStr,"UTF-8"));//使用setEntity方法，将我们传进来的参数放入请求中HttpResponse response = client.execute(httpost);//使用HttpResponse接收client执行httpost的结果String result = EntityUtils.toString(response.getEntity(),"UTF-8");//HttpEntity转为字符串类型jsonObject = JSONObject.fromObject(result);//字符串类型转为JSON类型return jsonObject;}/*** 获取AccessToken* @return 返回拿到的access_token及有效期*/public static AccessToken getAccessToken() throws ClientProtocolException, IOException{AccessToken token = new AccessToken();String url = ACCESS_TOKEN_URL.replace("APPID", APPID).replace("APPSECRET", APPSECRET);//将URL中的两个参数替换掉JSONObject jsonObject = doGetStr(url);//使用刚刚写的doGet方法接收结果if(jsonObject!=null){ //如果返回不为空，将返回结果封装进AccessToken实体类token.setToken(jsonObject.getString("access_token"));//取出access_tokentoken.setExpiresIn(jsonObject.getInt("expires_in"));//取出access_token的有效期
        }return token;}
}