微信公众号OAuth 点击菜单按钮 跳转页面授权 获取openid

微信公众号OAuth 点击菜单按钮 跳转页面授权 获取openid

流程：
用户点击菜单按钮
—–> 发送页面授权请求到微信后台
—–>得到code发送到 我们服务器后台的url
—–> 将code参数发送到微信后台获取用户的openid返回服务器上的页面(也可以直接获取用户头像等基本信息。。需用户点击同意授权)

菜单view按钮的url：

“=“+yourAppid+”&redirect_uri=”+你要跳转的url+”&response_type=code&scope=snsapi_base&state=1#wechat_redirect”

详情请见官方文档
.html

你要跳转的url 请求到后台 获取页面授权的code

    String code = Parameter("code");// 页面授权获取的code用以交换openid额access_tokenopenid = OAuthGetOpenid(code);// OAuth获取用户openid区分是哪个用户请求登录W3

/*** 通过页面OAuth授权,用code获取openid* * @param code* @return*/
public String OAuthGetOpenid(String code) {JSONObject json = new JSONObject();String requestUrl = "=你的公众号id&secret=你的公众号密码&code=" + code + "&grant_type=authorization_code";String outputStr = "";new HttpRequestPost();json = HttpRequestPost.httpRequest(requestUrl, outputStr, "POST");String openid = String("openid");return openid;
}

发送http请求的方法代码

/**** 向微信端发送post请求**/
public class HttpRequestPost {public static JSONObject httpRequest(String requestUrl, String outputStr, String method) {JSONObject jsonObject = null;StringBuffer buffer = new StringBuffer();try {// // 创建SSLContext对象，并使用我们指定的信任管理器初始化// TrustManager[] tm = { new MyX509TrustManager() };// SSLContext sslContext = Instance("SSL", "SunJSSE");// sslContext.init(null, tm, new java.security.SecureRandom());// 从上述SSLContext对象中得到SSLSocketFactory对象// SSLSocketFactory ssf = SocketFactory();URL url = new URL(requestUrl);HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();// httpUrlConn.setSSLSocketFactory(ssf);httpUrlConn.setDoOutput(true);httpUrlConn.setDoInput(true);httpUrlConn.setUseCaches(false);// 设置请求方式（GET/POST）httpUrlConn.setRequestMethod(method);t();// 当有数据需要提交时if (null != outputStr) {OutputStream outputStream = OutputStream();// 注意编码格式，防止中文乱码outputStream.Bytes("UTF-8"));outputStream.close();}// 将返回的输入流转换成字符串InputStream inputStream = InputStream();InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");BufferedReader bufferedReader = new BufferedReader(inputStreamReader);String str = null;while ((str = adLine()) != null) {buffer.append(str);}bufferedReader.close();inputStreamReader.close();// 释放资源inputStream.close();inputStream = null;httpUrlConn.disconnect();jsonObject = JSONObject.String());System.out.println("http-back:" + jsonObject);} catch (ConnectException ce) {println("Weixin server connection timed out.");} catch (Exception e) {println("https request error:{}" + e);}return jsonObject;}
}