0.先熟悉微信网页授权流程
https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_webpage_authorization.html
1.内网穿透
目的：使本地的服务能在微信客户端进行访问
1.购买隧道
2.进行配置
配置域名，ip和端口。在这里配本地可以访问的服务的ip和端口。
3 下载客户端
3 打开命令行在客户端同级目录执行：natapp -authtoken=xxxxxxxxxx,使隧道服务上线
2.注册微信公众平台测试账号
1.进入系统注册测试账号
2.扫码关注
3.绑定域名
填写上一步绑定的域名
到这里就可以实现在微信端对本地服务进行调用
3.代码实现
@RequestMapping("/getCodeAndOpenId") public WxInfo getCodeAndOpenId(@RequestParam("code") String code) { log.info("==> 先获取code,再获取openid 。code={}", code); Map params = new HashMap(); params.put("appid", "wxb00b277049d87059"); params.put("secret", "4f407849f4b50854ff6fbec3cc3d28a6"); params.put("grant_type", "authorization_code"); params.put("code", code); String result = HttpGetUtil.httpRequestToString( "https://api.weixin.qq.com/sns/oauth2/access_token", params); WxInfo wxInfo = new WxInfo(); if (result != null) { JSONObject jsonObject = JSONObject.parseObject(result); String openid = jsonObject.get("openid").toString(); log.info("==> 获取的 openid={}", openid); wxInfo.setCode(code); wxInfo.setOpenid(openid); } return wxInfo; }说明：用户在微信端点击链接：
https://open.weixin.qq.com/connect/oauth2/authorize?redirect_uri=http://niki.nat300.top/getCodeAndOpenId&appid=wxb00b277049d87059&response_type=code&scope=snsapi_base&state=1
后，会携带code跳转到 http://niki.nat300.top/getCodeAndOpenId,即执行getCodeAndOpenId方法
这个方法会根据code去获取openid
3.在微信端访问授权页面
在微信端任意一个窗口打开
4.返回结果
微信页面上返回了openid
5.总结
根据开发文档描述https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect，在访问这个授权页面后，需要跳转到最终真是访问的页面，实际上不需要，只需要是一个方法就行，而如果这个方法正好是获取openid的，那么正好顺势获取code，只需要通过一个方法就能获得openid。
6.工具类
public class HttpGetUtil { public static String httpRequestToString(String url, Map<String, String> params) { String result = null; try { InputStream is = httpRequestToStream(url, params); BufferedReader in = new BufferedReader(new InputStreamReader(is, "UTF-8")); StringBuffer buffer = new StringBuffer(); String line = ""; while ((line = in.readLine()) != null) { buffer.append(line); } result = buffer.toString(); } catch (Exception e) { return null; } return result; } private static InputStream httpRequestToStream(String url, Map<String, String> params) { InputStream is = null; try { if (!(params == null)) { String parameters = ""; boolean hasParams = false; for (String key : params.keySet()) { String value = URLEncoder.encode(params.get(key), "UTF-8"); parameters += key + "=" + value + "&"; hasParams = true; } if (hasParams) { parameters = parameters.substring(0, parameters.length() - 1); } url += "?" + parameters; } URL u = new URL(url); HttpURLConnection conn = (HttpURLConnection) u.openConnection(); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Accept-Charset", "UTF-8"); conn.setRequestProperty("contentType", "utf-8"); conn.setConnectTimeout(50000); conn.setReadTimeout(50000); conn.setDoInput(true); //设置请求方式，默认为GET conn.setRequestMethod("GET"); is = conn.getInputStream(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return is; }}7.后续改进
需要在中间(虚拟)页面判断访问渠道
2.如果是微信则需要通过授权链接跳转到明细保存接口
3.否则直接跳转到明细保存接口
@RequestMapping("/share/middle") public String middle(HttpServletRequest request, HttpServletResponse response) throws IOException { String userAgent = request.getHeader("user-agent").toLowerCase(); if (userAgent.indexOf("micromessenger") != -1) { log.info("==>用户访问的方式是微信渠道"); response.sendRedirect("https://open.weixin.qq.com/connect/oauth2/authorize?redirect_uri=http://niki.nat300.top/saveAccessDetail&appid=wxb00b277049d87059&response_type=code&scope=snsapi_base&state=1#wechat_redirect"); } else { log.info("==>用户访问的方式是其他渠道"); response.sendRedirect("http://niki.nat300.top/saveAccessDetail?code=123"); } return ""; } @RequestMapping("/saveAccessDetail") public WxInfo saveAccessDetail(HttpServletRequest request, @RequestParam("code") String code) { String userAgent = request.getHeader("user-agent").toLowerCase(); WxInfo wxInfo = new WxInfo(); if (userAgent.indexOf("micromessenger") != -1) { log.info("==>用户访问的方式是微信"); log.info("==> 先获取code,再获取openid 。code={}", code); Map params = new HashMap(); params.put("appid", "wxb00b277049d87059"); params.put("secret", "4f407849f4b50854ff6fbec3cc3d28a6"); params.put("grant_type", "authorization_code"); params.put("code", code); String result = HttpGetUtil.httpRequestToString( "https://api.weixin.qq.com/sns/oauth2/access_token", params); if (result != null) { JSONObject jsonObject = JSONObject.parseObject(result); String openid = jsonObject.get("openid").toString(); log.info("==> 获取的 openid={}", openid); wxInfo.setCode(code); wxInfo.setOpenid(openid); } } log.info("==>执行存入redis操作"); response.sendRedirect("https://www.apache.org/"); log.info("==>跳转到最终实际访问的页面。。。。。。。。。。。。。。"); return wxInfo; }来源地址：https://blog.csdn.net/weixin_37926633/article/details/131353083
