准备一个线程组，http请求和json提取器，
FileWriter fstream = new FileWriter("C:\\Users\\ying\\Desktop\\user_token.csv",true);
BufferedWriter out = new BufferedWriter(fstream);
out.write(vars.get("response")+",\n");
out.close();
fstream.close();
原文：https://www.cnblogs.com/jiaoliuxuexi/p/14682338.html