weichat openId 获取

package cn.hy.weixin.util;

import net.sf.json.JSONObject;

public class CommonUtil {
	
	public static String OPENID_ID = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=APPSECRET&code=CODE&grant_type=authorization_code";
	
	/**
	 * 根据code获取openid
	 * @param code
	 * @return
	 */
	public static String getOpenId(String code){
		
		String openid = null;
		String url = OPENID_ID.replace("APPID", HttpUtil.APPID).replace("APPSECRET", HttpUtil.APPSECRET).replace("CODE", code);
		
		JSONObject jsonObject = HttpUtil.doGetRequest(url);
		if(jsonObject != null){
			openid = jsonObject.getString("openid");
		}
		return openid;
	}
}
      

package cn.hy.weixin.util;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;

import net.sf.json.JSONObject;

import org.apache.http.HttpEntity;
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.util.EntityUtils;

/**
 * http工具类
 *
 */
public class HttpUtil {
	
	public static final String APPID = "xxx";
	public static final String APPSECRET = "xxx";
	
	
	public static final String ACCESS_TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
	public static final String CREATE_MENU_URL = "https://api.weixin.qq.com/cgi-bin/menu/create?access_token=ACCESS_TOKEN";

	
	/**
	 * 封装get请求
	 * @param url
	 * @return
	 */
	public static JSONObject doGetRequest(String url){
		DefaultHttpClient httpClient = new DefaultHttpClient();
		
		HttpClient newhttpClient = WebClientDevWrapper.wrapClient(httpClient);
		System.out.println("url**************" + url);
		HttpGet httpGet = new HttpGet(url);
		JSONObject jsonObject = null;
		try {
			HttpResponse response = newhttpClient.execute(httpGet);
			HttpEntity entity = response.getEntity();
			String result = EntityUtils.toString(entity, "UTF-8");
			jsonObject = JSONObject.fromObject(result);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return jsonObject;
	}
	
	/**
	 * 封装post请求
	 * @param url
	 * @param prarm
	 * @return
	 */
	public static JSONObject doPostRequest(String url,String prarm){
		DefaultHttpClient httpClient = new DefaultHttpClient();
		HttpClient newhttpClient = WebClientDevWrapper.wrapClient(httpClient);
		HttpPost httpPost = new HttpPost(url);
		JSONObject jsonObject = null;
		try {
			httpPost.setEntity(new StringEntity(prarm, "UTF-8"));
			HttpResponse response = newhttpClient.execute(httpPost);
			HttpEntity entity = response.getEntity();
			String result = EntityUtils.toString(entity, "UTF-8");
			jsonObject = JSONObject.fromObject(result);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return jsonObject;
	}
	
	/**
     * 发送短息 post请求并返回结果
     */
    public static String post(String url,String reqEncoding,String respEncoding,List<NameValuePair> param) {
    	HttpClient httpclient=new DefaultHttpClient();
        String resStr = "";
        // 创建httppost
        HttpPost httppost = new HttpPost(url);
        // 创建参数队列
        List<NameValuePair> formparams = param;
        UrlEncodedFormEntity uefEntity;
        try {
            uefEntity = new UrlEncodedFormEntity(formparams, reqEncoding);
            httppost.setEntity(uefEntity);
            HttpResponse response;
            response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                resStr = EntityUtils.toString(entity,respEncoding);
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e1) {
            e1.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭连接,释放资源
           httpclient.getConnectionManager().shutdown();
        }
        return resStr;
    }

}
      

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