WechatAuthorizeUtil.java

package com.github.ouyangbob.wechat.authorize;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.alibaba.fastjson.JSONObject;
import com.github.ouyangbob.http.HttpUtil;
import com.github.ouyangbob.wechat.WechatConstants;
import com.github.ouyangbob.wechat.vo.UserInfo;
import com.google.common.collect.Maps;

/**
 * 微信授权工具类
 * @author ouyangbotao
 *
 */
public class WechatAuthorizeUtil {
	private static final Logger logger = LoggerFactory.getLogger(WechatAuthorizeUtil.class);

	/**
	 * 生成授权URL
	 * https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
	 * @return
	 */
	public static String generateAuthorizeUrl(String callBackUrl){
		StringBuilder sb=new StringBuilder(WechatConstants.AUTHORIZE_URL);
		sb.append("?appid=");
		sb.append(WechatConstants.APPID);
		sb.append("&redirect_uri=");
		try {
			sb.append(URLEncoder.encode(callBackUrl,"utf-8"));
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		sb.append("&response_type=code");
		sb.append("&scope=snsapi_userinfo#wechat_redirect");
		
		return sb.toString();
	}
	
	/**
	 * 通过code获取accessToken
	 * https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code
	 * @param code
	 * @return
	 */
	public static AccessToken getAccessToken(String code){
		Map<String,String> paramMap=Maps.newHashMap();
		paramMap.put("appid", WechatConstants.APPID);
		paramMap.put("secret", WechatConstants.APPSECRET);
		paramMap.put("code", code);
		paramMap.put("grant_type", "authorization_code");
		String body=HttpUtil.getRequest(WechatConstants.AUTHORIZE_GET_ACCESSTOKEN_URL,paramMap);
		AccessToken accessToken=JSONObject.parseObject(body, AccessToken.class);
		if(StringUtils.isNotEmpty(accessToken.getErrCode())){
			logger.error("getAccessToken param:{},error:{}",paramMap,accessToken);
		}
		return accessToken;
	}
	
	/**
	 * 通过code获取accessToken
http：GET（请使用https协议）
https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN
	 * @param code
	 * @return
	 */
	public static UserInfo getUserInfo(AccessToken accessToken){
		Map<String,String> paramMap=Maps.newHashMap();
		paramMap.put("access_token", accessToken.getAccessToken());
		paramMap.put("openid", accessToken.getOpenid());
		paramMap.put("lang", "zh_CN");
		String body=HttpUtil.getRequest(WechatConstants.AUTHORIZE_GET_USERINFO_URL,paramMap);
		
		UserInfo userInfo=JSONObject.parseObject(body, UserInfo.class);
		if(StringUtils.isNotEmpty(userInfo.getErrCode())){
			logger.error("getUserInfo param:{},error:{}",paramMap,accessToken);
		}
		return userInfo;
	}
	
}