Jmeter 获取CSV行数

import java.io.BufferedReader;
import java.io.FileInputStream;

String str = "E:\\Desktop\\WOS接口测试";
String[] strs = {"评价列表.csv","添加留言.csv"};
for(int i=0;i<strs.length;i++)
{
    int rowNum = 0;
    FileReader fr = new FileReader(str+"\\"+strs[i]);
    BufferedReader br = new BufferedReader(fr);
    while((br.readLine())!=null)
    {
                rowNum++;
        }
        //System.out.println("rowNum"+i);
        //System.out.println(rowNum);
        vars.put("rowNum"+i,String.valueOf(rowNum));
    br.close();
}