使用tencent协议发起临时会话

调用默认浏览器打开链接tencent://message/?uin=QQ即可发起临时会话
参数uin为目标QQ

Java示例

import java.awt.Desktop;

import java.net.URI;

import java.io.IOException;

public class TempSession {

    public static void main(String[] args) throws IOException {

        Desktop.getDesktop().browse(URI.create("tencent://message/?uin=980639902"));

    }

}

Qt示例

QDesktopServices::openUrl(QUrl("tencent://message/?uin=980639902"));