tp5微信公众号获取用户openid_微信公众号支付（一）：获取用户openId

一、获取apikey,appsecret与商户号

注册公众号、商户号

二、获取用户的OpenId

1.设置【授权回调页面域名】

官方解释：用户在网页授权页同意授权给公众号后，微信会将授权数据传给一个回调页面，回调页面需在此域名下，以确保安全可靠。回调页面域名不支持IP地址。

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" 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2.用户同意授权

我是把这个url写在微信菜单下的，当进入这个页面的时候就让用户同意。注意：好像是静默授权的，用户不知道

1.url:

https://open.weixin.qq.com/connect/oauth2/authorize?appid=appid&redirect_uri=url&response_type=code&scope=snsapi_userinfo&state=park#wechat_redirect

参数：appid:公众号的唯一标识

redirect_uri:重定向的url,就是授权后要跳转的页面

scope:应用授权作用域

snsapi_base:不弹出授权页面，直接跳转，只能获取用户openid

snsapi_userinfo:弹出授权页面，可通过openid拿到昵称、性别、所在地

state:重定向后带的参数

2.用户同意后会产生一个code,只有5分钟时间的有效期。

String code = request.getParameter("code")

3.code换openId

/**

* 常量类

* @author rory.wu

*

*/

public class Constants {

// 第三方用户唯一凭证

public static String appid = "";

// 第三方用户唯一凭证密钥

public static String appsecret = "";

//商户ID

public static String mch_id="";

//获取openId

public static String oauth2_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code";

}

/**

* 通用工具类

* @author rory.wu

* @version 1.0

* @since 2015年08月05日

*/

public class CommonUtil {

private static Logger log = Logger.getLogger(CommonUtil.class);

public static JSONObject httpsRequestToJsonObject(String requestUrl, String requestMethod, String outputStr) {

JSONObject jsonObject = null;

try {

StringBuffer buffer = httpsRequest(requestUrl, requestMethod, outputStr);

jsonObject = JSONObject.fromObject(buffer.toString());

} catch (ConnectException ce) {

log.error("连接超时："+ce.getMessage());

} catch (Exception e) {

log.error("https请求异常："+e.getMessage());

}

return jsonObject;

}

private static StringBuffer httpsRequest(String requestUrl, String requestMethod, String output)

throws NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException, MalformedURLException,

IOException, ProtocolException, UnsupportedEncodingException {

URL url = new URL(requestUrl);

HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();

connection.setDoOutput(true);

connection.setDoInput(true);

connection.setUseCaches(false);

connection.setRequestMethod(requestMethod);

if (null != output) {

OutputStream outputStream = connection.getOutputStream();

outputStream.write(output.getBytes("UTF-8"));

outputStream.close();

}

// 从输入流读取返回内容

InputStream inputStream = connection.getInputStream();

InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");

BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

String str = null;

StringBuffer buffer = new StringBuffer();

while ((str = bufferedReader.readLine()) != null) {

buffer.append(str);

}

bufferedReader.close();

inputStreamReader.close();

inputStream.close();

inputStream = null;

connection.disconnect();

return buffer;

} }

/**

* 获取用户的openId，并放入session

* @param code 微信返回的code

*/

private void setOpenId(String code) {

session.put("code", code);

String oauth2_url = Constants.oauth2_url.replace("APPID", Constants.appid).replace("SECRET", Constants.appsecret).replace("CODE", String.valueOf(session.get("code")));

log.info("oauth2_url:"+oauth2_url);

JSONObject jsonObject = CommonUtil.httpsRequestToJsonObject(oauth2_url, "POST", null);

log.info("jsonObject:"+jsonObject);

Object errorCode = jsonObject.get("errcode");

if(errorCode != null) {

log.info("code不合法");

}else{

String openId = jsonObject.getString("openid");

log.info("openId:"+openId);

session.put("openId", openId);

}

}

oauth2_url返回的格式是：

{

"access_token":"ACCESS_TOKEN",

"expires_in":7200,

"refresh_token":"REFRESH_TOKEN",

"openid":"OPENID", "scope":"SCOPE",

"unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"

}

Code无效时：

{

"errcode":40029

,"errmsg":"invalid code"

}

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