Springboot网站第三方登录 微信登录

微信开放平台接入，官网：https://open.weixin.qq.com，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 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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