微信開放平台接入，官網：https://open.weixin.qq.com，在官網註冊並添加應用後即可獲得APP_ID和APP_SECRET。
步驟一：創建一個繼承AuthService的接口，WeChatAuthService，如下
public interface WeChatAuthService extends AuthService { public JSONObject getUserInfo(String accessToken, String openId);}步驟二： WeChatService的具體實現如下
@Servicepublic class WeChatAuthServiceImpl extends DefaultAuthServiceImpl implements WeChatAuthService { private Logger logger = LoggerFactory.getLogger(WeChatAuthServiceImpl.class);//請求此地址即跳轉到二維碼登錄界面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"; // 獲取用戶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"; //回調域名@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("獲取token失敗，msg = "+resp); } } //微信接口中，token和openId是一起返回，故此方法不需實現@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("獲取用戶信息錯誤，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小時的有效期，過時需要重新獲取，所以官方提供了//根據refresh_token 刷新獲取token的方法，本項目僅僅是獲取用戶//信息，並將信息存入庫，所以兩個小時也已經足夠了@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; }}步驟三：
在Controller中調用，代碼如下：
@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，兩小時過期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); //根據openId判斷用戶是否已經登陸過KmsUser user = userService.getUserByCondition(openId); if (user == null) { response.sendRedirect(request.getContextPath() + "/student/html/index.min.html#/bind?type="+Constants.LOGIN_TYPE_WECHAT); } else { //如果用戶已存在，則直接登錄response.sendRedirect(request.getContextPath() + "/student/html/index.min.html#/app/home?open_id=" + openId); } }步驟四：
前台js中，先請求auth/wxLoginPage，獲取授權地址，等用戶授權後會回調/auth/wechat，在此方法中進行邏輯處理即可。
遇到過的坑：
1.在微信官網中配置回調域名的時候，不需要些http或https協議，只需要寫上域即可，例如http://baidu.com，只需要填寫baidu.com即可，如果是想要跳轉到項目下面的某個Controller的某個方法中，如baidu.com/auth/wechat ，配置的時候也只需要配baidu.com，不需要指定後面的auth/wechat，後面的地址在代碼中配置回調的地址的時候寫上即可，代碼中應該配置為https://baidu.com/auth/wechat
2.在跳轉到授權二維碼界面的時候，會遇到有的時候二維碼出不來的狀況，這是因為代碼中的回調地址的問題，按照上面代碼中的方式配置應該是沒有問題的
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。