jmeter: beanshell后置处理程序，清空文件和保存json提取器提取的数据到文件中

 此处将查询到的所有id值保存在变量jobID中,查询到的个数保存在变量jobID_matchNr中，格式如下：

jobID_1=19962

.......

jobID_28=18922
jobID_29=18912
jobID_matchNr=29

beanshell脚本中对json提取器中参数的引用格式为：${json提取器保存的变量名}，例如${jobID_1}、${jobID_2}、${jobID_matchNr}。

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
//清空文件
FileWriter clrfstream=new FileWriter("D:/02workspace/Jmeter/RPA性能测试脚本20210609/单接口/jobId.csv",false);
BufferedWriter clrout=new BufferedWriter(clrfstream);
clrout.write("");
clrout.close();
clrfstream.close();

//追加方式写入数据
FileWriter fstream=new FileWriter("D:/02workspace/Jmeter/RPA性能测试脚本20210609/单接口/jobId.csv",true);
BufferedWriter out=new BufferedWriter(fstream);

for (int i=1;i<=${jobID_matchNr};i++){
	
	jobID_i="jobID_"+i;
	//log.info(jobID_i);
	String jobId= vars.get(jobID_i);
	//log.info(jobId);
	out.write(jobId+"
");
}	

out.close();
fstream.close();