java字符串中拼接参数

//%s相当于?代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        String url = String.format(
                baseUrl,  //地址
                ConstantWxUtils.WX_OPEN_APP_ID,   //第一个参数%s
                ConstantWxUtils.WX_OPEN_REDIRECT_URL,    //第二个参数%s
                "acloud"     //第三个参数%s
        );