700字范文 > 【微信开放平台】微信第三方扫码登录（亲测可用）

【微信开放平台】微信第三方扫码登录（亲测可用）

时间：2020-04-08 22:08:14

开放平台需要企业认证才能注册，正好这次公司提供了一个账号，调通以后，就顺便写一篇博客吧。

公众平台与开放平台的区别

微信开放平台

主要面对移动应用/网站应用开发者，为其提供微信登录、分享、支付等相关权限和服务。

微信公众平台

微信公众平台用于管理、开放微信公众号（包括订阅号、服务号、企业号），简单的说就是微信公众号的后台运营、管理系统。

这里想吐槽一下，微信基本注册全都要邮箱，公众号一个、小程序一个、开放平台一个、我哪他妈有这么多邮箱啊，又记不住密码，下面正题。

官方文档链接

准备工作

网站应用微信登录是基于OAuth2.0协议标准构建的微信OAuth2.0授权登录系统。

在进行微信OAuth2.在进行微信OAuth2.0授权登录接入之前，在微信开放平台注册开发者帐号，并拥有一个已审核通过的网站应用，并获得相应的AppID和AppSecret，申请微信登录且通过审核后，可开始接入流程。

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点击创建网站应用

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按照要求填写信息，等待审核通过就可以获取appid和appsecret

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然后找到回调授权域名这一项修改成要回调的域名，例如：不要加http://或https://

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好了需要提前准备的东西就完事了，下面就是代码部分了。

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这是完整的调用图

我这里用的spring boot项目进行测试的，但是代码都大致相同

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第一步：请求CODE

这是自己用到的HttpClientUtils工具类

package com.lj.demo.controller.util;import mons.lang3.StringUtils;import org.apache.http.conn.ConnectTimeoutException;import org.apache.http.impl.client.HttpClients;import .SocketTimeoutException;import java.security.GeneralSecurityException;import java.io.IOException;import java.security.cert.CertificateException;import java.security.cert.X509Certificate;import java.util.ArrayList;import java.util.List;import java.util.Map;import java.util.Map.Entry;import java.util.Set;import .ssl.SSLContext;import .ssl.SSLException;import .ssl.SSLSession;import .ssl.SSLSocket;import mons.io.IOUtils;import org.apache.http.Consts;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.HttpClient;import org.apache.http.client.config.RequestConfig;import org.apache.http.client.config.RequestConfig.Builder;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.conn.ssl.SSLConnectionSocketFactory;import org.apache.http.conn.ssl.SSLContextBuilder;import org.apache.http.conn.ssl.TrustStrategy;import org.apache.http.conn.ssl.X509HostnameVerifier;import org.apache.http.entity.ContentType;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;import org.apache.http.message.BasicNameValuePair;/*** @author LvJun* @create -03-16 17:51**/public class HttpClientUtils {public static final int connTimeout=10000;public static final int readTimeout=10000;public static final String charset="UTF-8";private static HttpClient client = null;static {PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();cm.setMaxTotal(128);cm.setDefaultMaxPerRoute(128);client = HttpClients.custom().setConnectionManager(cm).build();}public static String postParameters(String url, String parameterStr) throws ConnectTimeoutException, SocketTimeoutException, Exception{return post(url,parameterStr,"application/x-www-form-urlencoded",charset,connTimeout,readTimeout);}public static String postParameters(String url, String parameterStr,String charset, Integer connTimeout, Integer readTimeout) throws ConnectTimeoutException, SocketTimeoutException, Exception{return post(url,parameterStr,"application/x-www-form-urlencoded",charset,connTimeout,readTimeout);}public static String postParameters(String url, Map<String, String> params) throws ConnectTimeoutException,SocketTimeoutException, Exception {return postForm(url, params, null, connTimeout, readTimeout);}public static String postParameters(String url, Map<String, String> params, Integer connTimeout,Integer readTimeout) throws ConnectTimeoutException,SocketTimeoutException, Exception {return postForm(url, params, null, connTimeout, readTimeout);}public static String get(String url) throws Exception {return get(url, charset, null, null);}public static String get(String url, String charset) throws Exception {return get(url, charset, connTimeout, readTimeout);}/*** 发送一个 Post 请求, 使用指定的字符集编码.** @param url* @param body RequestBody* @param mimeType 例如 application/xml "application/x-www-form-urlencoded" a=1&b=2&c=3* @param charset 编码* @param connTimeout 建立链接超时时间,毫秒.* @param readTimeout 响应超时时间,毫秒.* @return ResponseBody, 使用指定的字符集编码.* @throws ConnectTimeoutException 建立链接超时异常* @throws SocketTimeoutException 响应超时* @throws Exception*/public static String post(String url, String body, String mimeType,String charset, Integer connTimeout, Integer readTimeout)throws ConnectTimeoutException, SocketTimeoutException, Exception {HttpClient client = null;HttpPost post = new HttpPost(url);String result = "";try {if (StringUtils.isNotBlank(body)) {HttpEntity entity = new StringEntity(body, ContentType.create(mimeType, charset));post.setEntity(entity);}// 设置参数Builder customReqConf = RequestConfig.custom();if (connTimeout != null) {customReqConf.setConnectTimeout(connTimeout);}if (readTimeout != null) {customReqConf.setSocketTimeout(readTimeout);}post.setConfig(customReqConf.build());HttpResponse res;if (url.startsWith("https")) {// 执行 Https 请求.client = createSSLInsecureClient();res = client.execute(post);} else {// 执行 Http 请求.client = HttpClientUtils.client;res = client.execute(post);}result = IOUtils.toString(res.getEntity().getContent(), charset);} finally {post.releaseConnection();if (url.startsWith("https") && client != null&& client instanceof CloseableHttpClient) {((CloseableHttpClient) client).close();}}return result;}/*** 提交form表单** @param url* @param params* @param connTimeout* @param readTimeout* @return* @throws ConnectTimeoutException* @throws SocketTimeoutException* @throws Exception*/public static String postForm(String url, Map<String, String> params, Map<String, String> headers, Integer connTimeout,Integer readTimeout) throws ConnectTimeoutException,SocketTimeoutException, Exception {HttpClient client = null;HttpPost post = new HttpPost(url);try {if (params != null && !params.isEmpty()) {List<NameValuePair> formParams = new ArrayList<org.apache.http.NameValuePair>();Set<Entry<String, String>> entrySet = params.entrySet();for (Entry<String, String> entry : entrySet) {formParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));}UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, Consts.UTF_8);post.setEntity(entity);}if (headers != null && !headers.isEmpty()) {for (Entry<String, String> entry : headers.entrySet()) {post.addHeader(entry.getKey(), entry.getValue());}}// 设置参数Builder customReqConf = RequestConfig.custom();if (connTimeout != null) {customReqConf.setConnectTimeout(connTimeout);}if (readTimeout != null) {customReqConf.setSocketTimeout(readTimeout);}post.setConfig(customReqConf.build());HttpResponse res = null;if (url.startsWith("https")) {// 执行 Https 请求.client = createSSLInsecureClient();res = client.execute(post);} else {// 执行 Http 请求.client = HttpClientUtils.client;res = client.execute(post);}return IOUtils.toString(res.getEntity().getContent(), "UTF-8");} finally {post.releaseConnection();if (url.startsWith("https") && client != null&& client instanceof CloseableHttpClient) {((CloseableHttpClient) client).close();}}}/*** 发送一个 GET 请求** @param url* @param charset* @param connTimeout 建立链接超时时间,毫秒.* @param readTimeout 响应超时时间,毫秒.* @return* @throws ConnectTimeoutException 建立链接超时* @throws SocketTimeoutException 响应超时* @throws Exception*/public static String get(String url, String charset, Integer connTimeout,Integer readTimeout)throws ConnectTimeoutException,SocketTimeoutException, Exception {HttpClient client = null;HttpGet get = new HttpGet(url);String result = "";try {// 设置参数Builder customReqConf = RequestConfig.custom();if (connTimeout != null) {customReqConf.setConnectTimeout(connTimeout);}if (readTimeout != null) {customReqConf.setSocketTimeout(readTimeout);}get.setConfig(customReqConf.build());HttpResponse res = null;if (url.startsWith("https")) {// 执行 Https 请求.client = createSSLInsecureClient();res = client.execute(get);} else {// 执行 Http 请求.client = HttpClientUtils.client;res = client.execute(get);}result = IOUtils.toString(res.getEntity().getContent(), charset);} finally {get.releaseConnection();if (url.startsWith("https") && client != null && client instanceof CloseableHttpClient) {((CloseableHttpClient) client).close();}}return result;}/*** 从 response 里获取 charset** @param ressponse* @return*/@SuppressWarnings("unused")private static String getCharsetFromResponse(HttpResponse ressponse) {// Content-Type:text/html; charset=GBKif (ressponse.getEntity() != null && ressponse.getEntity().getContentType() != null && ressponse.getEntity().getContentType().getValue() != null) {String contentType = ressponse.getEntity().getContentType().getValue();if (contentType.contains("charset=")) {return contentType.substring(contentType.indexOf("charset=") + 8);}}return null;}/*** 创建 SSL连接* @return* @throws GeneralSecurityException*/private static CloseableHttpClient createSSLInsecureClient() throws GeneralSecurityException {try {SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {public boolean isTrusted(X509Certificate[] chain,String authType) throws CertificateException {return true;}}).build();SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, new X509HostnameVerifier() {@Overridepublic boolean verify(String arg0, SSLSession arg1) {return true;}@Overridepublic void verify(String host, SSLSocket ssl)throws IOException {}@Overridepublic void verify(String host, X509Certificate cert)throws SSLException {}@Overridepublic void verify(String host, String[] cns,String[] subjectAlts) throws SSLException {}});return HttpClients.custom().setSSLSocketFactory(sslsf).build();} catch (GeneralSecurityException e) {throw e;}}}

微信有两种方式认证一种是调转到微信域名下，还一种是直接把二维码嵌套到自己网站中。

这里是跳转到微信的认证方式

首先在页面做一个简单的按钮触发事件获取认证code

<button onclick="login()">微信登录</button>

js调用部分

<script>function login() {$.ajax({type: "POST",//这个路径根据自己的情况填写url: "/demo-wechat/wechat/getCode",success: function (data) {console.log(data);if (data.code == 200) {window.location.href = (data.result);} else {alert("认证失败");}},error: function (data) {alert("认证失败");}});}</script>

后台代码url参数都要根据自己的实际情况进行修改

@RequestMapping("/getCode")public void getCode() throws Exception {//拼接urlStringBuilder url = new StringBuilder();url.append("https://open./connect/qrconnect?");//appidurl.append("appid=" + "appid");//回调地址 ,回调地址要进行Encode转码 String redirect_uri = "回调地址"//转码url.append("&redirect_uri=" + URLEncodeUtil.getURLEncoderString(redirect_uri));url.append("&response_type=code");url.append("&scope=snsapi_login");HttpClientUtils.get(url.toString(), "GBK");}

参数说明

redirect_uri 这个参数是用户扫码确认以后微信调用自己的路径例如：/wechat/callback

拼完路径可以打印出来看一下完整的路径应该是这样

https://open./connect/qrconnect?appid=wxbdc5610cc59c1631&redirect_uri=https%3A%2F%%2Fwechat%2Fcallback.do&response_type=code&scope=snsapi_login&state=3d6be0a4035d839573b04816624a415e#wechat_redirect

到此获取code就完成了，用户确认以后回调自己的时候会带两个参数，

1.code

2.state

如果调用没有传递state就不会返回state 用户拒绝了登录请求，返回的结果不会有code

第二步：通过code获取access_token

接下来完成回调的方法直接上代码

/*** 微信回调*/@RequestMapping("/callback")public ModelAndView callback(String code,String state) throws Exception {System.out.println("===="+code+"==="+state+"====");if(StringUtils.isNotEmpty(code)){StringBuilder url = new StringBuilder();url.append("https://api./sns/oauth2/access_token?");url.append("appid=" + "appid");url.append("&secret=" + "secret");//这是微信回调给你的codeurl.append("&code=" + code);url.append("&grant_type=authorization_code");String result = HttpClientUtils.get(url.toString(), "UTF-8");System.out.println("result:" + result.toString());}return new ModelAndView("login");}

返回说明

正确的返回：

{

"access_token":"ACCESS_TOKEN",

"expires_in":7200,

"refresh_token":"REFRESH_TOKEN",

"openid":"OPENID",

"scope":"SCOPE",

"unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"

}

错误返回样例：

{"errcode":40029,"errmsg":"invalid code"}