微信授权登录

今天在这里给大家介绍下微信授权登录主要分一下几个步骤

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1、引导用户进入授权页面同意授权，获取code 

2、通过code换取网页授权access_token（与基础支持中的access_token不同） 

3、如果需要，开发者可以刷新网页授权access_token，避免过期 

4、通过网页授权access_token和openid获取用户基本信息（支持UnionID机制） 

下面就来具体给大家介绍怎么实现

//得到codepublic final static String code_url="https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect";//得到openidpublic final static String open_id_url="https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code";//刷新access_tokenpublic final static String access_token_url="https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=APPID&grant_type=refresh_token&refresh_token=REFRESH_TOKEN";//获取用户信息public final static String user_info_url="https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN";//判断用户是否关注公众号public final static String user_guanzhu="https://api.weixin.qq.com/cgi-bin/user/info?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN";String appid=WeiXinUitls.appid;//公众号IDString code = request.getParameter("code");String appsecret = WeiXinUitls.appsecret;//公众号的appsecretString grant_type = "authorization_code";String returnJSON = HttpTool.getToken(appid, appsecret, grant_type,code);JSONObject obj = JSONObject.fromObject(returnJSON);if(!(obj==null)){String openid = obj.get("openid").toString();String token = obj.get("access_token").toString();String retoken = obj.get("refresh_token").toString();这里就已经成功获取微信用户的openid}public static String getToken(String appid,String appsecret, String grantType, String code){String requestUrl = open_id_url.replace("APPID", appid).replace("SECRET", appsecret).replace("CODE", code).replace("authorization_code",grantType);JSONObject jsonObject = httpRequest(requestUrl,"GET", null);//System.out.println("得到json的大�?+jsonObject.size());return jsonObject.toString();}String appid=WeiXinUitls.appid;String redirect_url="此处为返回code的servlet(注意的是这里的url需要经过编码)";HttpTool.getCode(appid, redirect_url);public static String getCode(String appid,String redirect_uri){String requestUrl = code_url.replace("APPID", appid).replace("REDIRECT_URI", redirect_uri).replace("SCOPE", "snsapi_userinfo").replace("STATE", "wxsq123");JSONObject jsonObject = httpRequest(requestUrl,"GET", null);return jsonObject.toString();}public static JSONObject httpRequest(String requestUrl,String requestMethod, String outputStr) {JSONObject jsonObject = null;StringBuffer buffer = new StringBuffer();try {// /1、解决https请求的问�?// 创建SSLContext对象，并使用我们指定的信任管理器初始�?TrustManager[] tm = { new MyX509TrustManager() };SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");sslContext.init(null, tm, new java.security.SecureRandom());// 从上述SSLContext对象中得到SSLSocketFactory对象SSLSocketFactory ssf = sslContext.getSocketFactory();URL url = new URL(requestUrl);HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();httpUrlConn.setSSLSocketFactory(ssf);httpUrlConn.setDoOutput(true);httpUrlConn.setDoInput(true);httpUrlConn.setUseCaches(false);// /2、兼容GET、POST两种方式// 设置请求方式（GET/POST�?httpUrlConn.setRequestMethod(requestMethod);if ("GET".equalsIgnoreCase(requestMethod)) {httpUrlConn.connect();}// /3、兼容有数据提交、无数据提交两种情况// 当有数据�?��提交�?if (null != outputStr) {OutputStream outputStream = httpUrlConn.getOutputStream();// 注意编码格式，防止中文乱�?outputStream.write(outputStr.getBytes("UTF-8"));outputStream.close();}// 将返回的输入流转换成字符�?InputStream inputStream = httpUrlConn.getInputStream();InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");BufferedReader bufferedReader = new BufferedReader(inputStreamReader);String str = null;while ((str = bufferedReader.readLine()) != null) {buffer.append(str);}bufferedReader.close();inputStreamReader.close();// 释放资源inputStream.close();inputStream = null;httpUrlConn.disconnect();jsonObject = JSONObject.fromObject(buffer.toString());} catch (ConnectException ce) {} catch (Exception e) {}return jsonObject;}

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