java集成微信扫码登录

具体流程可以看微信官网的扫码登录文档
地址：https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419316505&token=&lang=zh_CN

一、前期准备
1、注册
微信开放平台：https://open.weixin.qq.com
2、邮箱激活
3、完善开发者资料
4、开发者资质认证
准备营业执照，1-2个工作日审批、300元
5、创建网站应用
提交审核，7个工作日审批
6、内网穿透
ngrok的使用

二、扫码登录流程
1、首先准备工作

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，目前只支持企业不支持个人

申请微信登录且通过审核后，可开始接入流程。就是你的网站要想实现微信扫码登陆功能首先要在微信备案通过，它才会给你个AppID和AppSecret。

2、微信登录开发流程：
申请微信接入
生成登录二维码
用户扫码并授权
调用回调方法
通过code去获取用户信息带到页面展示

1. 申请微信接入：
先提醒下各位：申请微信接入很麻烦，需公司营业执照，个人好像暂时不能申请成功。

先去到微信开放平台 https://open.weixin.qq.com
在这里插入图片描述

申请一个网站应用 (要审核通过之后才能用) 在这里插入图片描述
appid和appSecret就是调用微信接口的凭证
授权回调域：调用微信接口生成的二维码地址，用户扫码并授权后，会重定向到回调地址
因为在本地localhost进行测试，如果回调地址为localhost第三方微信将无法进行跳转。原因是外网访问不到本地，怎么办?解决办法：那就使用 ngrok 内网穿透把本地项目服务映射到公网，所以在测试时填写的回调地址是内网穿透时的访问域名
如果不知道内网穿透的小伙伴，建议先看看 Sunny-Ngrok 内网穿透的使用

在这里插入图片描述
三、项目环境搭建：
1、导入jar包，这里请求微信地址时需要用到httpclient所以要导入httpclient的依赖，和json依赖用于解析数据。其他依赖根据项目需求自行引入

<dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId>
</dependency>
<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId>
</dependency>

2、配置文件

网站应用申请成功后会得到appid和appSecret
wx.open.app_id=
wx.open.app_secret=
//回调地址
wx.open.redirect_url=

3、HttpClient工具类

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
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.ConnectTimeoutException;
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.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;
import java.io.IOException;
import java.net.SocketTimeoutException;
import java.security.GeneralSecurityException;
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;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<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*/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*/@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;}}
}

4、后端controller接口

@Controller
@RequestMapping("/api/ucenter/wx")
public class WeixinApiController {@Autowiredprivate UserInfoService userInfoService;//微信扫描后回调的方法@GetMapping("callback")public String callback(String code,String state) {//1、获取到临时票据 codeSystem.out.println("code"+code);//2、拿着code和微信id和秘钥，请求微信固定地址StringBuffer baseAccessTokenUrl = new StringBuffer().append("https://api.weixin.qq.com/sns/oauth2/access_token").append("?appid=%s").append("&secret=%s").append("&code=%s").append("&grant_type=authorization_code");String accessTokenUrl = String.format(baseAccessTokenUrl.toString(),ConstantPropertiesUtil.WX_OPEN_APP_ID,ConstantPropertiesUtil.WX_OPEN_APP_SECRET,code);//使用httpclient请求这个地址try {String accesstokenInfo = HttpClientUtils.get(accessTokenUrl);System.out.println("accesstokenInfo:"+accesstokenInfo);//从返回字符串获取两个值 openid 和 access_tokenJSONObject jsonObject = JSONObject.parseObject(accesstokenInfo);String access_token = jsonObject.getString("access_token");String openid = jsonObject.getString("openid");//判断数据库是否存在微信扫码记录//根据openid判断UserInfo userInfo = userInfoService.selectWxInfoOpenId(openid);if (null == userInfo) {//拿着openid 和 access_token 请求微信地址，得到扫码人信息String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +"?access_token=%s" +"&openid=%s";String userInfoUrl = String.format(baseUserInfoUrl, access_token, openid);String resultInfo = HttpClientUtils.get(userInfoUrl);System.out.println("resultInfo"+resultInfo);JSONObject resultUserInfo = JSONObject.parseObject(resultInfo);//获取昵称String nickname = resultUserInfo.getString("nickname");//获取头像String headimgurl = resultUserInfo.getString("headimgurl");userInfo = new UserInfo();userInfo.setNickName(nickname);userInfo.setOpenid(openid);userInfo.setStatus(1);userInfoService.save(userInfo);}//返回mapMap<String,String> map = new HashMap<>();String name = userInfo.getName();if (StringUtils.isEmpty(name)) {name = userInfo.getNickName();}if (StringUtils.isEmpty(name)) {name = userInfo.getPhone();}map.put("name",name);//前端判断，如果openid不为空，说明没有绑定手机号，进行绑定，为空说明已经绑定，不再绑定if (StringUtils.isEmpty(userInfo.getPhone())) {map.put("openid",userInfo.getOpenid());} else {map.put("openid","");}String token = JwtHelper.createToken(userInfo.getId(), name);map.put("token",token);//注意我这里跳转的是一个前端的页面带着用户的信息return "redirect:"+ ConstantPropertiesUtil.YYGH_BASE_URL + "/weixin/callback?token="+map.get("token")+"&openid="+map.get("openid")+"&name="+URLEncoder.encode(map.get("name"),"utf-8");} catch (Exception e) {e.printStackTrace();return null;}}//1、生成微信扫描二维码//生成二维码需要的参数@ResponseBody@GetMapping("/getLoginParam")public Result getLoginParam() {try {Map<String,Object> map = new HashMap<>();String wxOpenRedirectUrl = ConstantPropertiesUtil.WX_OPEN_REDIRECT_URL;String wxRedirectUri = URLEncoder.encode(wxOpenRedirectUrl, "utf-8");map.put("appid", ConstantPropertiesUtil.WX_OPEN_APP_ID);map.put("scope","snsapi_login");map.put("redirect_uri",wxRedirectUri);map.put("state",System.currentTimeMillis());return Result.ok(map);} catch (UnsupportedEncodingException e) {e.printStackTrace();return null;}}}

前台vue代码

<div><div id="weixinLogin"></div>
</div>

//点击事件
weixinLogin() {this.dialogAtrr.showLoginType = 'weixin'//初始化微信相关参数//调用后台controller的getLoginParam方法weixinApi.getLoginParam().then((result) => {var obj = new WxLogin({self_redirect:true,id: 'weixinLogin', // 需要显示的容器idappid: result.data.appid, // 公众号appid wx*******scope: result.data.scope, // 网页默认即可redirect_uri: result.data.redirect_uri, // 授权成功后回调的urlstate: result.data.state, // 可设置为简单的随机数加session用来校验style: 'black', // 提供"black"、"white"可选。二维码的样式href: '' // 外部css文件url，需要https})})
},

以上代码仅供参考，可根据自己的实际业务更改