Java实现微信登录

时间:2021-7-4 作者:qvyue
Java实现微信登录
微信扫描登录.png

、一准备工作

https://open.weixin.qq.com
1、注册
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、熟悉微信登录流程
参考文档:https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419316505&token=e547653f995d8f402704d5cb2945177dc8aa4e7e&la
ng=zh_CN

2、后端开发

1、application.properties添加相关配置信息

# 微信开放平台 appid
wx.open.app_id=你的appid
# 微信开放平台 appsecret
wx.open.app_secret=你的appsecret
# 微信开放平台 重定向url
wx.open.redirect_url=http://你的服务器名称/api/ucenter/wx/callback

2、创建常量类

创建util包,创建ConstantPropertiesUtil.java常量类

package com.caiweiwei.user.utils;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class ConstantPropertiesUtil implements InitializingBean {

    @Value("${wx.open.app_id}")
    private String appId;
    @Value("${wx.open.app_secret}")
    private String appSecret;
    @Value("${wx.open.redirect_url}")
    private String redirectUrl;
    public static String WX_OPEN_APP_ID;
    public static String WX_OPEN_APP_SECRET;
    public static String WX_OPEN_REDIRECT_URL;


    @Override
    public void afterPropertiesSet() throws Exception {
        WX_OPEN_APP_ID = appId;
        WX_OPEN_APP_SECRET = appSecret;
        WX_OPEN_REDIRECT_URL = redirectUrl;
    }
}

3、创建controller

api包中创建WxApiController

package com.caiweiwei.user.controller;

import com.caiweiwei.commonutils.DateFormat;
import com.caiweiwei.commonutils.JwtUtils;
import com.caiweiwei.servicebase.exceptionhandler.GuliException;
import com.caiweiwei.user.entity.UcenterMember;
import com.caiweiwei.user.service.UcenterMemberService;
import com.caiweiwei.user.utils.ConstantPropertiesUtil;
import com.caiweiwei.user.utils.HttpClientUtils;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Date;
import java.util.HashMap;
import java.util.UUID;

@CrossOrigin
@Controller//注意这里没有配置 @RestController
@RequestMapping("/api/ucenter/wx")
public class WxApiController {
    @Autowired
    private UcenterMemberService ucenterMemberService;

    @GetMapping("/callback")
    public String callback(String code, String state) {
        //第一步 根据code向微信发送请求 获取用户的openid
        //拼接参数
        String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                "?appid=%s" +
                "&secret=%s" +
                "&code=%s" +
                "&grant_type=authorization_code";
        String accessTokenUrl=String.format(
                baseAccessTokenUrl,
                ConstantPropertiesUtil.WX_OPEN_APP_ID,
                ConstantPropertiesUtil.WX_OPEN_APP_SECRET,
                code
        );
        //使用httpclient模拟发送请求
        try {
            String s = HttpClientUtils.get(accessTokenUrl);
            //将获取的信息转换成map
            Gson gson=new Gson();
            HashMap hashMap = gson.fromJson(s, HashMap.class);
            //获取map里面的内容
            String access_token = (String)hashMap.get("access_token");
            String openid = (String)hashMap.get("openid");
            //第二步 根据appid查询数据库又是否有用户信息
            UcenterMember userInfoByOpenId = ucenterMemberService.getUserInfoByOpenId(openid);
            if (userInfoByOpenId==null){
                //第三步 根据openid获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl=String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userinfo字符串扫描人信息
                HashMap map = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String)map.get("nickname");//昵称
                String headimgurl = (String)map.get("headimgurl");//头像
                userInfoByOpenId = new UcenterMember();
                String id=UUID.randomUUID().toString().replaceAll("-","");
                userInfoByOpenId.setId(id);
                userInfoByOpenId.setIsDisabled(false);
                userInfoByOpenId.setIsDeleted(false);
                DateFormat dateFormat = new DateFormat();
                Date date = dateFormat.dateFormat(new Date());
                userInfoByOpenId.setGmtCreate(date);
                userInfoByOpenId.setGmtModified(date);
                userInfoByOpenId.setOpenid(openid);
                userInfoByOpenId.setNickname(nickname);
                userInfoByOpenId.setAvatar(headimgurl);
                ucenterMemberService.saveUserInfo(userInfoByOpenId);
            }
            //第三步 生成token重定向页面
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(userInfoByOpenId.getId(), userInfoByOpenId.getNickname());
            //最后:返回首页面,通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;
        } catch (Exception e) {
          throw  new GuliException(20001,"登陆失败");
        }

    }


    @GetMapping("/login")
    public String login() {
        //固定地址,后面拼接参数
//        String url = "https://open.weixin.qq.com/" +
//                "connect/qrconnect?appid="+ ConstantWxUtils.WX_OPEN_APP_ID+"&response_type=code";

        // 微信开放平台授权baseUrl  %s相当于?代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";
        //对redirect_uri进行URLEncoder编码
        String redirectUrl = ConstantPropertiesUtil.WX_OPEN_REDIRECT_URL;
        System.out.println(redirectUrl + "++++++++++++++++++++++++++++++++++++++++++++");
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        //设置%s里面的值
        String url = String.format(
                baseUrl,
                ConstantPropertiesUtil.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );
        //进行重定向到微信请求里面
        return "redirect:" + url;
    }
}

授权url参数说明

Java实现微信登录
image.png

二、回调

1、全局配置的跳转路径

# 微信开放平台 重定向url
wx.open.redirect_url=http://回调地址/api/ucenter/wx/callback

2、测试回调方法

在WxApiController中添加方法

@GetMapping("callback")
public String callback(String code, String state, HttpSession session) {
//得到授权临时票据code
System.out.println("code = " + code);
System.out.println("state = " + state);
}

3、后台开发

1、添加依赖


org.apache.httpcomponentshttpclientcommons-iocommons-iocom.google.code.gsongson

2、创建httpclient工具类

package com.caiweiwei.user.utils;

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;

/**
 *  依赖的jar包有:commons-lang-2.6.jar、httpclient-4.3.2.jar、httpcore-4.3.1.jar、commons-io-2.4.jar
 * @author zhaoyb
 *
 */
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
     *
     * @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=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;
        }
    }

    public static void main(String[] args) {
        try {
            String str= post("https://localhost:443/ssl/test.shtml","name=12&page=34","application/x-www-form-urlencoded", "UTF-8", 10000, 10000);
            //String str= get("https://localhost:443/ssl/test.shtml?name=12&page=34","GBK");
            /*Map map = new HashMap();
            map.put("name", "111");
            map.put("page", "222");
            String str= postForm("https://localhost:443/ssl/test.shtml",map,null, 10000, 10000);*/
            System.out.println(str);
        } catch (ConnectTimeoutException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SocketTimeoutException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

3、创建回调controller方法

在WxApiController.java中添加如下方法

 @GetMapping("/callback")
    public String callback(String code, String state) {
        //第一步 根据code向微信发送请求 获取用户的openid
        //拼接参数
        String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                "?appid=%s" +
                "&secret=%s" +
                "&code=%s" +
                "&grant_type=authorization_code";
        String accessTokenUrl=String.format(
                baseAccessTokenUrl,
                ConstantPropertiesUtil.WX_OPEN_APP_ID,
                ConstantPropertiesUtil.WX_OPEN_APP_SECRET,
                code
        );
        //使用httpclient模拟发送请求
        try {
            String s = HttpClientUtils.get(accessTokenUrl);
            //将获取的信息转换成map
            Gson gson=new Gson();
            HashMap hashMap = gson.fromJson(s, HashMap.class);
            //获取map里面的内容
            String access_token = (String)hashMap.get("access_token");
            String openid = (String)hashMap.get("openid");
            //第二步 根据appid查询数据库又是否有用户信息
            UcenterMember userInfoByOpenId = ucenterMemberService.getUserInfoByOpenId(openid);
            if (userInfoByOpenId==null){
                //第三步 根据openid获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl=String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userinfo字符串扫描人信息
                HashMap map = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String)map.get("nickname");//昵称
                String headimgurl = (String)map.get("headimgurl");//头像
                userInfoByOpenId = new UcenterMember();
                String id=UUID.randomUUID().toString().replaceAll("-","");
                userInfoByOpenId.setId(id);
                userInfoByOpenId.setIsDisabled(false);
                userInfoByOpenId.setIsDeleted(false);
                DateFormat dateFormat = new DateFormat();
                Date date = dateFormat.dateFormat(new Date());
                userInfoByOpenId.setGmtCreate(date);
                userInfoByOpenId.setGmtModified(date);
                userInfoByOpenId.setOpenid(openid);
                userInfoByOpenId.setNickname(nickname);
                userInfoByOpenId.setAvatar(headimgurl);
                ucenterMemberService.saveUserInfo(userInfoByOpenId);
            }
            //第三步 生成token重定向页面
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(userInfoByOpenId.getId(), userInfoByOpenId.getNickname());
            //最后:返回首页面,通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;
        } catch (Exception e) {
          throw  new GuliException(20001,"登陆失败");
        }

    }
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