原创声明：本文转来源本人另一博客【http://blog.csdn.net/liaohaojian/article/details/70175835】绝非他人处转载

从接触公众号到现在，开发维护了2个公众号，开发过程中遇到很多问题，现在把部分模块功能在这备案一下，做个总结也希望能给其他人帮助

工欲善其事，必先利其器，先看看开发公众号需要准备或了解什么

1. web开发工具：官方提供的开发工具，使用自己的微信号来调试微信网页授权、调试、检验页面的 JS-SDK 相关功能与权限，模拟大部分 SDK 的输入和输出。下载地址：web开发工具下载

2. 开发文档：https://mp.weixin.qq.com/wiki

3. 登录微信测试公众号，获取公众号的appID、appsecret，登录地址：http://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=sandbox/login （一般测试开发阶段，都不拿正式公众号测试，因为存在风险并且你调试时不用担心影响到正式公众号的正常使用，而且有些接口在正式公众号上比较严格，而在测试公众号上可以放开，如模板信息）

下面进入正题，实现微信网页授权，获取微信信息，主要用于以微信帐号作为用户登录，如果你只是需要绑定微信，就可以不用授权，直接请求获取微信OpenId（对当前公众号唯一），进行用户绑定（在下面代码时是写明如何实现），该功能可在开发文档：微信网页开发-》微信网页授权里查看详细信息，下面正式开始。

1.填写授权回调页面域名

进入测试公众号，在体验接口权限表中找到网页帐号，右侧添加自己的域名，测试公众号可填写本地IP，如你是正式公众号只能填写自己的域名，如果未填写，当进行接口调用时，会提示：redirect_uri参数错误！如果还有其他不了解的配置，可以在开发文档里查看详信息，

2.代码展示

1).调用微信接口返回的参数都是JSON格式，封装个Http请求方法

public class WeixinUtil {/*** 发起https请求并获取结果* @param requestUrl 请求地址* @param requestMethod 请求方式（GET、POST）* @param outputStr 提交的数据* @return JSONObject(通过JSONObject.get(key)的方式获取json对象的属性值)*/public static JSONObject httpRequest(String requestUrl, String requestMethod, String outputStr) {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 = 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);// 设置请求方式（GET/POST）httpUrlConn.setRequestMethod(requestMethod);if ("GET".equalsIgnoreCase(requestMethod))httpUrlConn.connect();// 当有数据需要提交时if (null != outputStr) {OutputStream outputStream = httpUrlConn.getOutputStream();// 注意编码格式，防止中文乱码outputStream.write(outputStr.getBytes("UTF-8"));outputStream.close();}// 将返回的输入流转换成字符串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) {log.error("Weixin server connection timed out.");} catch (Exception e) {log.error("https request error:{}", e);}return jsonObject;}
}

2).下面展示访问个人中心时，进行用户授权

/*** 个人中心* @param request* @param response* @return*/
@RequestMapping("/gotoPeopleIndex")
public String gotoPeopleIndex(HttpServletRequest request,HttpServletResponse response){//判断是否授权过，授权通过时，会保存session“WeixinUserInfo”，这样下次访问时，如果WeixinUserInfo存在，说明已经授权过，用户信息已经存在WeixinUserInfo WeixinUserInfo =  (WeixinUserInfo) session.getAttribute("WeixinUserInfo");if(WeixinUserInfo==null){//没有授权过，跳转授权页面，如果你不需要授权，则scope为snsapi_base，这是不会弹出授权页面String url  = "https://open.weixin.qq.com/connect/oauth2/authorize?appid="+TimedTask.appid+"&redirect_uri="+TimedTask.websiteAndProject+"/weixinF/getOpenInfo/gotoPeopleIndex&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";return "redirect:"+url;}else{return "weixin/customer/userInfo";}
}
/*** 微信网页授权获得微信详情* @param code* @param state* @param view 授权后调整的视图* @param request* @param appid 公众号appid* @param appsecret 公众号appsecret* @param websiteAndProject  请求地址跟工程名，如我当前的为http://192.168.2.113/seafood* @param response* @throws ServletException* @throws IOException*/
@RequestMapping("/getOpenInfo/{view}")
public void getOpenInfo(@RequestParam("code") String code,@RequestParam("state") String state,@PathVariable("view") String view,HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{// 用户同意授权if (!"authdeny".equals(code)) {//获取OpenIdOpenIdResult open = WeixinUtil.getOpenId(request, code, TimedTask.appid, TimedTask.appsecret);//检验授权凭证（access_token）是否有效int result = WeixinUtil.checkAccessToken(open.getAccess_token(), open.getOpenid());if(0 != result){open = WeixinUtil.getNewAccess_Token(open,open.getRefresh_token(),TimedTask.appid);}// 网页授权接口访问凭证String accessToken = open.getAccess_token();String openId = open.getOpenid();//获取微信用户详细信息，如果你不需要授权，可跳过该步骤，直接以微信的OpenId，查找是否已经绑定，没有跳转到绑定界面WeixinUserInfo user = WeixinUtil.getWeixinUserInfo(accessToken, openId);Customer customer = weixinFirstServer.getCustomerDetailByOpenId(user.getOpenId());if(customer!=null){if(customer.getAccountStatus()==2){response.setContentType("text/html; charset=UTF-8");try {response.sendRedirect(TimedTask.websiteAndProject+"/weixin/customer/noAuthority.jsp");} catch (IOException e) {e.printStackTrace();}return;}customer.setHeadPhoto(user.getHeadImgUrl());}else{Customer newuser = new Customer();newuser.setCustomerWeixinId(openId);newuser.setCustomerWNickname(user.getNickname());newuser.setSex(user.getSex());//绑定result = weixinFirstServer.addCustomerInfo(newuser);if(result<=0){response.setContentType("text/html; charset=UTF-8");try {response.sendRedirect(TimedTask.websiteAndProject+"/weixin/customer/error.jsp");} catch (IOException e) {e.printStackTrace();}}else{customer = weixinFirstServer.getCustomerDetailByOpenId(user.getOpenId());if(customer.getAccountStatus()==2){response.setContentType("text/html; charset=UTF-8");try {response.sendRedirect(TimedTask.websiteAndProject+"/weixin/customer/noAuthority.jsp");} catch (IOException e) {e.printStackTrace();}return;}}}session.setAttribute("customerInfo", customer);session.setAttribute("WeixinUserInfo", user);request.setAttribute("state", state);response.setContentType("text/html; charset=UTF-8");try {response.sendRedirect(TimedTask.websiteAndProject+"/weixinF/"+view);} catch (IOException e) {e.printStackTrace();}}else{response.setContentType("text/html; charset=UTF-8");try {response.sendRedirect(TimedTask.websiteAndProject+"/weixin/customer/error.jsp");} catch (IOException e) {e.printStackTrace();}}
}

微信工具类代码：

public class WeixinUtil {public final static String getOpen_id_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code";/*** 检验授权凭证（access_token）是否有效* @param accessToken 凭证* @param openid id* @return*/public static int checkAccessToken(String accessToken, String openid) {String requestUrl = "https://api.weixin.qq.com/sns/auth?access_token="+accessToken+"&openid="+openid;JSONObject jsonObject = httpRequest(requestUrl, "GET", null);int result = 1;// 如果请求成功if (null != jsonObject) {try {result = jsonObject.getInt("errcode");} catch (JSONException e) {accessToken = null;// 获取token失败log.error("获取token失败 errcode:{} errmsg:{}", jsonObject.getInt("errcode"), jsonObject.getString("errmsg"));}}return result;}/*** 用户授权，使用refresh_token刷新access_token* @return*/public static OpenIdResult getNewAccess_Token(OpenIdResult open,String refresh_token,String openId) {String requestUrl = getNewAccess_token.replace("REFRESH_TOKEN", refresh_token).replace("APPID", openId);JSONObject jsonObject = httpRequest(requestUrl, "GET", null);// 如果请求成功if (null != jsonObject) {try {open.setAccess_token(jsonObject.getString("access_token"));} catch (JSONException e) {// 获取token失败log.error("获取token失败 errcode:{} errmsg:{}", jsonObject.getInt("errcode"), jsonObject.getString("errmsg"));}}return open;}/*** 获得用户基本信息* @param request * @param code* @param appid* @param appsecret* @return*/public static OpenIdResult getOpenId(HttpServletRequest request, String code,String appid, String appsecret) {String requestURI = request.getRequestURI();String param = request.getQueryString();if(param!=null){requestURI = requestURI+"?"+param;}String url = getOpen_id_url.replace("APPID",appid).replace("SECRET",appsecret).replace("CODE",code);JSONObject jsonObject = httpRequest(url, "POST", null);OpenIdResult result = new OpenIdResult();if (null != jsonObject) {Object obj = jsonObject.get("errcode");if (obj == null) {result.setAccess_token(jsonObject.getString("access_token"));result.setExpires_in(jsonObject.getString("expires_in"));result.setOpenid(jsonObject.getString("openid"));result.setRefresh_token(jsonObject.getString("refresh_token"));result.setScope(jsonObject.getString("scope"));}else{System.out.println("获取openId回执："+jsonObject.toString()+"访问路径："+requestURI);log.error("访问路径:"+requestURI);log.error("获取openId失败 errcode:{} errmsg:{}", jsonObject.getInt("errcode"), jsonObject.getString("errmsg"));}}return result;}/*** 通过网页授权获取用户信息* @param accessToken 网页授权接口调用凭证* @param openId 用户标识* @return WeixinUserInfo*/public static WeixinUserInfo getWeixinUserInfo(String accessToken, String openId) {WeixinUserInfo user = null;// 拼接请求地址String requestUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID";requestUrl = requestUrl.replace("ACCESS_TOKEN", accessToken).replace("OPENID", openId);// 通过网页授权获取用户信息JSONObject jsonObject = httpRequest(requestUrl, "GET", null);if (null != jsonObject) {try {user = new WeixinUserInfo();// 用户的标识user.setOpenId(jsonObject.getString("openid"));// 昵称user.setNickname(jsonObject.getString("nickname"));// 性别（1是男性，2是女性，0是未知）user.setSex(jsonObject.getInt("sex"));// 用户所在国家user.setCountry(jsonObject.getString("country"));// 用户所在省份user.setProvince(jsonObject.getString("province"));// 用户所在城市user.setCity(jsonObject.getString("city"));// 用户头像user.setHeadImgUrl(jsonObject.getString("headimgurl"));// 用户特权信息user.setPrivilegeList(JSONArray.toList(jsonObject.getJSONArray("privilege"), List.class));} catch (Exception e) {user = null;int errorCode = jsonObject.getInt("errcode");String errorMsg = jsonObject.getString("errmsg");log.error("获取用户信息失败 errcode:{} errmsg:{}，reqUrl{}", errorCode, errorMsg);}}return user;}
}

下面展示，当用户session失效时，自动登录的代码，这时是不需要授权的

@RequestMapping("/gotoGoodsView")
public String gotoGoodsView(@RequestParam(value="longitude",defaultValue="",required=false) String longitude,@RequestParam(value="latitude",defaultValue="",required=false) String latitude){String param = request.getQueryString();String url = request.getServletPath();if(param!=null){url = url+"?"+param.replaceAll("&","-");//如果不把&替换成别的，当重新登录成功后调整会参数丢失}Customer customerInfo = (Customer) session.getAttribute("customerInfo");if(customerInfo==null){//session失效，跳转到获取微信详情页面（授权）return "redirect:/weixinF/getCode?view="+TimedTask.websiteAndProject+"/weixinF/autoLogin&view2="+TimedTask.websiteAndProject+url;}return "/weixin/customer/goodsList";
}
@RequestMapping("/getCode")
public void getCode(HttpServletResponse response){String view  = request.getParameter("view");//获取openId的路径String view2  = request.getParameter("view2");//获取openId成功后跳转的路径String redirect_url = "";try {redirect_url = URLEncoder.encode(view,"UTF-8");if(view2!=null && !"".equals(view2)){view2 = view2.replaceAll("-","&");redirect_url = redirect_url +"?redirect_url="+ URLEncoder.encode(URLEncoder.encode(view2,"UTF-8"),"UTF-8");}} catch (UnsupportedEncodingException e1) {e1.printStackTrace();}String url = WeixinUtil.getCode_url.replace("APPID",TimedTask.appid).replace("REDIRECT_URI",redirect_url);response.setContentType("text/html; charset=UTF-8");try {response.sendRedirect(url);} catch (IOException e) {e.printStackTrace();}
}
/*** 自动登录并跳转* @param code* @param appid 公众号appid* @param appsecret 公众号appsecret* @param websiteAndProject  请求地址跟工程名，如我当前的为http://192.168.2.113/seafood* @param url 自动登录后跳转路径* @return*/
@RequestMapping("/autoLogin")
public String autoLogin(HttpServletResponse response,@RequestParam(value="code",defaultValue="") String code,@RequestParam(value="redirect_url",defaultValue="") String url){OpenIdResult open = WeixinUtil.getOpenId(request,code,TimedTask.appid,TimedTask.appsecret);//根据Code获取OpenId//根据OpenId查找是否有该客户，没有进行绑定Customer customerInfo = weixinFirstServer.getCustomerDetailByOpenId(open.getOpenid());if(customerInfo!=null){if(customerInfo.getAccountStatus()==2){//用户账户是否正常return "redirect:"+TimedTask.websiteAndProject+"/weixin/customer/noAuthority.jsp";}session.setAttribute("customerInfo", customerInfo);//把用户信息存在session中response.setContentType("text/html; charset=UTF-8");try {response.sendRedirect(url);} catch (IOException e) {e.printStackTrace();}return null;}else{url= url.replaceAll("&","-");url = url.replace(TimedTask.websiteAndProject,"");String redirectUrl  = "https://open.weixin.qq.com/connect/oauth2/authorize?appid="+TimedTask.appid+"&redirect_uri="+TimedTask.websiteAndProject+"/weixinF/getOpenInfoRedirectAction?actionName="+url+"&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";response.setContentType("text/html; charset=UTF-8");try {response.sendRedirect(redirectUrl);} catch (IOException e) {e.printStackTrace();}return null;}
}

到此，微信网页授权认证，与session失效自动登录已经完成，如果有问题欢迎在评论区指出