csv转excle

package com.test.utils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;

import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.stereotype.Component;

@Component
public class FileConverter {

    /**
     * csv文件转excel
     * @param filepath  文件路径，转换到同目录下
     * @param filename  文件名，转换为相同文件名
     * @return
     */
    public static String convertCsv2Excel(String filepath,String filename) {
        try {
//            String csvFileAddress = "F:\\bgt\\api\\aaaaaaaaaaa.csv"; //csv file address
//            String xlsxFileAddress = "F:\\bgt\\api\\aaaaaaaaaaa.xlsx"; //xlsx file address
            String csvFileAddress = filepath.concat(File.separator).concat(filename).concat(".csv");
            String xlsxFileAddress = filepath.concat(File.separator).concat(filename).concat(".xlsx");
            XSSFWorkbook workBook = new XSSFWorkbook();
            XSSFSheet sheet = workBook.createSheet("sheet1");
            String currentLine=null;
            int RowNum=0;
            BufferedReader br = new BufferedReader(new FileReader(csvFileAddress));
            while ((currentLine = br.readLine()) != null) {
                String str[] = currentLine.split(",");
                XSSFRow currentRow=sheet.createRow(RowNum);
                for(int i=0;i