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
申请一个网站应用 (要审核通过之后才能用)
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
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
org.apache.httpcomponents
httpclient
com.alibaba
fastjson
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 params) throws ConnectTimeoutException,
SocketTimeoutException, Exception {
return postForm(url, params, null, connTimeout, readTimeout);
}
public static String postParameters(String url, Map 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 params, Map headers, Integer connTimeout,Integer readTimeout) throws ConnectTimeoutException,
SocketTimeoutException, Exception {
HttpClient client = null;
HttpPost post = new HttpPost(url);
try {
if (params != null && !params.isEmpty()) {
List formParams = new ArrayList();
Set> entrySet = params.entrySet();
for (Entry 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 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=GBK
if (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() {
@Override
public boolean verify(String arg0, SSLSession arg1) {
return true;
}
@Override
public void verify(String host, SSLSocket ssl)
throws IOException {
}
@Override
public void verify(String host, X509Certificate cert)
throws SSLException {
}
@Override
public 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 {
@Autowired
private 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 code
System.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_token
JSONObject 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map
Map 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 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
//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id
appid: 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url
state: 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