uni-app：
import jWeixin from 'jweixin-module';
let allowUrl = `https://open.weixin.qq.com/connect/oauth2/authorize?appid=${WXappid}&redirect_uri=${encodeURIComponent(WXredirectUrl)}&response_type=code&scope=${WXscope}&state=STATE#wechat_redirect`;
window.location.replace(allowUrl);
wxGetTicketInfo({urlInfo: location.href.split('#')[0]}).then(res=>{
jWeixin.config({
debug: false,
appId: res.data.appid, // 必填，公众号的唯一标识
timestamp: res.data.timestamp, // 必填，生成签名的时间戳
nonceStr: res.data.noncestr, // 必填，生成签名的随机串
signature: res.data.signature,// 必填，签名
jsApiList: this.jsApiList // 必填，需要使用的JS接口列表
});
})
jWeixin.scanQRCode({
needResult: 1, // 默认为0，扫描结果由微信处理，1则直接返回扫描结果，
scanType: ["qrCode","barCode"], // 可以指定扫二维码还是一维码，默认二者都有
success: function (res) {
},
fail: function(err){
// console.log('扫描失败:',err);
uni.showModal({
title:'温馨提示',
content:'扫描失败，请重新扫码',
showCancel:false,
confirmText:'我知道了'
})
}
});后端接口：
@RequestMapping("/login")
public void login(HttpServletResponse response) throws IOException {
int type = weChatScan.getType();
String redirect_uri = "http://xxx.xxx.xxx.xxx/api/scan/wxCallBackInfo"
//请求地址
String url = "https://open.weixin.qq.com/connect/oauth2/authorize" +
"?appid=" + appid +
"&redirect_uri=" + URLEncoder.encode(redirect_uri, "UTF-8") +
"&response_type=code" +
"&scope=" + baseScope +
"&state=STATE#wechat_redirect";
//重定向
String s = HttpUtil.get(url);
response.sendRedirect(url);
}
// 回调方法
@GetMapping("/wxCallBackInfo")
public void wxCallBackInfo(WeChatScanDto weChatScan, HttpServletResponse response, @RequestParam("code") String code) {
Map<String, Object> resultMap = new HashMap<String, Object>();
String url = "https://api.weixin.qq.com/sns/oauth2/access_token" +
"?appid=" + appid +
"&secret=" + appsecret +
"&code=" + code +
"&grant_type=" + grant_type;
try {
String s = HttpUtil.get(url);
//返回结果的json对象
JSONObject resultObject = JSON.parseObject(s);
String openid = resultObject.getString("openid");
response.sendRedirect(scan_url + "?openId=" + openid);
} catch (Exception e) {
String message = e.getMessage();
AesException aesException = new AesException(AesException.NoBindBuffer);
if (!aesException.getMessage().equals(message)) {
message = "微信扫码失败，请联系管理员！";
}
}
}
//获取前端所需的ticket
@GetMapping("/wxGetTicketInfo")
public AjaxResult wxLogin(HttpServletRequest request, String urlInfo) {
WxConfig wxConfig = SpringUtils.getBean(WxConfig.class);
String accessToken = redisCache.getCacheObject("wx_access_token");
if(StringUtils.isEmpty(accessToken)){
new WxUtil().createWxAccessToken();
accessToken = redisCache.getCacheObject("wx_access_token");
}
String ticket = redisCache.getCacheObject("wx_ticket");
Map<String,String> map = redisCache.getCacheObject("wx_signature_map");
if(StringUtils.isEmpty(ticket)){
String ticketUrl = wxConfig.getTicket_url() + "?access_token=" + accessToken + "&type=jsapi";
try{
String ticketInfo = HttpUtil.get(ticketUrl);
JSONObject ticketObject = JSON.parseObject(ticketInfo);
String errcode = ticketObject.getString("errcode");
if (!"0".equals(errcode)) {
logger.info(ticketObject.toString());
new WxUtil().createWxAccessToken();
accessToken = redisCache.getCacheObject("wx_access_token");
ticketUrl = wxConfig.getTicket_url() + "?access_token=" + accessToken + "&type=jsapi";
ticketInfo = HttpUtil.get(ticketUrl);
ticketObject = JSON.parseObject(ticketInfo);
}
logger.info(ticketObject.toString());
ticket = ticketObject.getString("ticket");
Integer ticketExpiresIn = ticketObject.getInteger("expires_in");
redisCache.setCacheObject("wx_ticket", ticket, ticketExpiresIn, TimeUnit.SECONDS);
String noncestr = SHA1Util.randomUUID();//随机字符串
String timestamp = String.valueOf(System.currentTimeMillis()/1000);//时间戳
//4获取url
// 根据项目需要获取对应的url地址
//5、将参数排序并拼接字符串
String str = "jsapi_ticket=" + ticket + "&noncestr=" + noncestr + "×tamp=" + timestamp + "&url=" + urlInfo;
//6、将字符串进行sha1加密
String signature = SHA1Util.SHA1(str);
map = new HashMap<String,String>();
map.put("urlInfo", urlInfo);
map.put("timestamp", timestamp);
map.put("ticket", ticketObject.getString("ticket"));
map.put("noncestr", noncestr);
map.put("signature", signature);
map.put("appid", wxConfig.getAppid());
redisCache.setCacheObject("wx_signature_map", map);
}catch (Exception e){
logger.error("失败", e);
return AjaxResult.error("获取签名失败");
}
}
return AjaxResult.success(map);
}