Springboot网站第三方登录 微信登录

微信开放平台接入，官网：，在官网注册并添加应用后即可获得app_id和app_secret。

步骤一：创建一个继承authservice的接口，wechatauthservice，如下

public interface wechatauthservice extends authservice {
  public jsonobject getuserinfo(string accesstoken, string openid);
}

步骤二：wechatservice的具体实现如下

@service
public class wechatauthserviceimpl extends defaultauthserviceimpl implements wechatauthservice {

  private logger logger = loggerfactory.getlogger(wechatauthserviceimpl.class);

//请求此地址即跳转到二维码登录界面
  private static final string authorization_url =
      "https://open.weixin.qq.com/connect/qrconnect?appid=%s&redirect_uri=%s&response_type=code&scope=%s&state=%s#wechat_redirect";

  // 获取用户 openid 和access——toke 的 url
  private static final string accesstoke_openid_url =
      "https://api.weixin.qq.com/sns/oauth2/access_token?appid=%s&secret=%s&code=%s&grant_type=authorization_code";

  private static final string refresh_token_url =
      "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=%s&grant_type=refresh_token&refresh_token=%s";

  private static final string user_info_url =
      "https://api.weixin.qq.com/sns/userinfo?access_token=%s&openid=%s&lang=zh_cn";

  private static final string app_id="xxxxxx";
  private static final string app_secret="xxxxxx";
  private static final string scope = "snsapi_login";

  private string callbackurl = "https://www.xxx.cn/auth/wechat"; //回调域名

  @override
  public string getauthorizationurl() throws unsupportedencodingexception {
    callbackurl = urlencoder.encode(callbackurl,"utf-8");
    string url = string.format(authorization_url,app_id,callbackurl,scope,system.currenttimemillis());
    return url;
  }


  @override
  public string getaccesstoken(string code) {
    string url = string.format(accesstoke_openid_url,app_id,app_secret,code);

    uricomponentsbuilder builder = uricomponentsbuilder.fromhttpurl(url);
    uri uri = builder.build().encode().touri();

    string resp = getresttemplate().getforobject(uri, string.class);
    logger.error("getaccesstoken resp = "+resp);
    if(resp.contains("openid")){
      jsonobject jsonobject = jsonobject.parseobject(resp);
      string access_token = jsonobject.getstring("access_token");
      string openid = jsonobject.getstring("openid");;

      jsonobject res = new jsonobject();
      res.put("access_token",access_token);
      res.put("openid",openid);
      res.put("refresh_token",jsonobject.getstring("refresh_token"));

      return res.tojsonstring();
    }else{
      throw new serviceexception("获取token失败，msg = "+resp);
    }
  }

  //微信接口中，token和openid是一起返回，故此方法不需实现
  @override
  public string getopenid(string accesstoken) {
    return null;
  }

  @override
  public jsonobject getuserinfo(string accesstoken, string openid){
    string url = string.format(user_info_url, accesstoken, openid);
    uricomponentsbuilder builder = uricomponentsbuilder.fromhttpurl(url);
    uri uri = builder.build().encode().touri();

    string resp = getresttemplate().getforobject(uri, string.class);
    logger.error("getuserinfo resp = "+resp);
    if(resp.contains("errcode")){
      throw new serviceexception("获取用户信息错误，msg = "+resp);
    }else{
      jsonobject data =jsonobject.parseobject(resp);

      jsonobject result = new jsonobject();
      result.put("id",data.getstring("unionid"));
      result.put("nickname",data.getstring("nickname"));
      result.put("avatar",data.getstring("headimgurl"));

      return result;
    }
  }

  //微信的token只有2小时的有效期，过时需要重新获取，所以官方提供了
  //根据refresh_token 刷新获取token的方法，本项目仅仅是获取用户
  //信息，并将信息存入库，所以两个小时也已经足够了
  @override
  public string refreshtoken(string refresh_token) {

    string url = string.format(refresh_token_url,app_id,refresh_token);

    uricomponentsbuilder builder = uricomponentsbuilder.fromhttpurl(url);
    uri uri = builder.build().encode().touri();

    responseentity<jsonobject> resp = getresttemplate().getforentity(uri,jsonobject.class);
    jsonobject jsonobject = resp.getbody();

    string access_token = jsonobject.getstring("access_token");
    return access_token;
  }
}

步骤三：

在controller中调用，代码如下：

@requestmapping(value = "/wxloginpage",method = requestmethod.get)
  public jsonobject wxloginpage() throws exception {
    string uri = wechatauthservice.getauthorizationurl();
    return loginpage(uri);
  }

  @requestmapping(value = "/wechat")
  public void callback(string code,httpservletrequest request,httpservletresponse response) throws exception {
    string result = wechatauthservice.getaccesstoken(code);
    jsonobject jsonobject = jsonobject.parseobject(result);

    string access_token = jsonobject.getstring("access_token");
    string openid = jsonobject.getstring("openid");
//    string refresh_token = jsonobject.getstring("refresh_token");

    // 保存 access_token 到 cookie，两小时过期
    cookie accesstokencookie = new cookie("accesstoken", access_token);
    accesstokencookie.setmaxage(60 *2);
    response.addcookie(accesstokencookie);

    cookie openidcookie = new cookie("openid", openid);
    openidcookie.setmaxage(60 *2);
    response.addcookie(openidcookie);

    //根据openid判断用户是否已经登陆过
    kmsuser user = userservice.getuserbycondition(openid);

    if (user == null) {
      response.sendredirect(request.getcontextpath() + "/student/html/index.min.html#/bind?type="+constants.login_type_wechat);
    } else {
      //如果用户已存在，则直接登录
      response.sendredirect(request.getcontextpath() + "/student/html/index.min.html#/app/home?open_id=" + openid);
    }
  }

步骤四：

前台js中，先请求auth/wxloginpage，获取授权地址，等用户授权后会回调/auth/wechat，在此方法中进行逻辑处理即可。

遇到过的坑：

1.在微信官网中配置回调域名的时候，不需要些http或https协议，只需要写上域即可，例如http://baidu.com，只需要填写baidu.com即可，如果是想要跳转到项目下面的某个controller的某个方法中，如baidu.com/auth/wechat ，配置的时候也只需要配baidu.com，不需要指定后面的auth/wechat，后面的地址在代码中配置回调的地址的时候写上即可，代码中应该配置为https://baidu.com/auth/wechat
2.在跳转到授权二维码界面的时候，会遇到有的时候二维码出不来的状况，这是因为代码中的回调地址的问题，按照上面代码中的方式配置应该是没有问题的

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