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
@Servicepublic 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
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。