如何使用beanshell写入数据到文件（txt、csv）

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.UUID;

public class RandomData {

	public static void writeDataToFile(String filename, boolean bb, String ll) {
		FileWriter fw;
		BufferedWriter bw = null;
		try {
			fw = new FileWriter(filename, bb);
			bw = new BufferedWriter(fw);
			//char c[] = ll.toCharArray();
			bw.write(ll);
			bw.flush(); // 一定要刷新缓冲区
			bw.newLine(); // 换行
			bw.close(); // 一定要关闭数据流
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (bw != null) {
					bw.close();
				}
			} catch (Exception e2) {
				// TODO: handle exception
			}
		}

	}
}

String creditNo = UUID.randomUUID().toString().substring(0, 36).replace("-", "");
String thirduserno = UUID.randomUUID().toString().substring(0, 20).replace("-", "");
String filepath = "D:\\BaiduYunDownload\\work\\pressure_test\\banqiandata\\pay.csv";
String data=creditNo+","+thirduserno;
RandomData.writeDataToFile(filepath,true,data);//将授信申请号及thirdUserNo写入文件
vars.put("creditNo",creditNo);
vars.put("thirdUserNo",thirduserno);

log.info("======="+creditNo);
log.info("+++++++++"+vars.get("creditNo"));