微信域名授权跳转 解决微信授权域名限制

IndexController.kt

    private val authUrl = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECTURI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect"
    private val appId = "xxxxxxx"
    private val redirectUrl = "http://www.xxx.com/xxx/redirectBack"

    @GetMapping("/getCode")
    fun redirect(url: String, scope: String, response: HttpServletResponse) {
        println(url)
        val encodeUrl = encode(url, StandardCharsets.UTF_8)
        val redirectUrl: String = authUrl
                .replace("APPID", appId)
                .replace("REDIRECTURI", encode("$redirectUrl?url=$encodeUrl", StandardCharsets.UTF_8))
                .replace("SCOPE", scope)
        response.sendRedirect(redirectUrl)
    }

    @GetMapping("/redirectBack")
    fun redirectBack(url: String, response: HttpServletResponse, code: String) {
        val redirectUrl = url + (if (url.contains("?")) "&" else "?") + "code=$code"
        response.sendRedirect(redirectUrl)
    }