json-lib简单使用之微信公众平台(三)

json-lib-2.4-jdk15.jar //需要以下几个jar包的支持
commons-logging-1.1.3.jar
ezmorph-1.0.6.jar
commons-lang-2.4.jar
commons-collections.jar
commons-beanutils-1.8.0.jar

package cn.wx.server;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import net.sf.json.JSONObject;

public class AccessToken {

	/**
	 * 根据注册信息，获得的参数，提交get请求，获得accessTkoen
	 * @author lpe234
	 * @time 2014-5-21 00:52:15
	 */
	String appID = "XXXXXXXXXXXXXX";
	String appsecret = "XXXXXXXXXXXXXXXXX";//微信服务号或者申请测试账号的订阅号才有。。。
	String preUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s";
	String tempUrl = String.format(preUrl, appID, appsecret);
/**  测试
*	public static void main(String[] args) {
*		AccessToken as = new AccessToken();
*		System.out.println(as.get());
*	}
*/
	//返回String类型access_token
	public String get() {
		String temp = null;
		temp = getJSON();
		JSONObject j = JSONObject.fromObject(temp);
		temp = j.getString("access_token");
		//System.out.println(temp);
		return temp;
	}

	// 获取wx服务器返回JSON数据,private内部调用
	private String getJSON() {
		String temp = null;
		try {
			URL url = new URL(tempUrl);
			URLConnection conn = url.openConnection();
			InputStreamReader isr = new InputStreamReader(conn.getInputStream());
			BufferedReader br = new BufferedReader(isr);
			temp = br.readLine();
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		//System.out.println(temp);
		return temp;
	}
}