java 关于xlsx（xls） 和 csv 文件的数据解析

1、适用于xlsx 和 xls 

<!--xlsx和xls文件pom依赖-->
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml</artifactId>
			<version>3.17</version>
		</dependency>

package com.test.demo.util;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.*;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * @program: demo
 * @description: java解析Excel(xls, xlsx)
 * @author: ZhuGaoPo
 * @version:1.0
 * @create: 2019-11-20 16:34
 */
public class XlsxUtils {
    public static void main(String[] args) {
       String filePath = "E:\\file\\csv\\test1.xlsx";
       String []columns = {"姓名","性别","电话号码"};
       List<Map<String,String>> list = getExcel(filePath, columns);
        //遍历解析出来的list
        for (Map<String,String> map : list) {
            System.out.println(map.get(columns[0]));
            for (Map.Entry<String,String> entry : map.entrySet()) {
                System.out.print(entry.getKey()+":"+entry.getValue()+",");
            }
        }
    }
    /**
     *读取excel
     * @param filePath
     * @return
     */
    public static Workbook readExcel(String filePath){
        Workbook wb = null;
        if(filePath==null){
            return null;
        }
        String extString = filePath.substring(filePath.lastIndexOf("."));
        InputStream is = null;
        try {
            is = new FileInputStream(filePath);
            if(".xls".equals(extString)){
                return wb = new HSSFWorkbook(is);
            }else if(".xlsx".equals(extString)){
                return wb = new XSSFWorkbook(is);
            }else{
                return wb = null;
            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return wb;
    }
    /**
    *获取excel 的内容
    * @param cell
    * @return
    */
    public static Object getCellFormatValue(Cell cell){
        Object cellValue = null;
        if(cell!=null){
            //判断cell类型
            switch(cell.getCellType()){
                //数字
                case Cell.CELL_TYPE_NUMERIC:{
                    Double value = cell.getNumericCellValue();
                    BigDecimal bd1 = new BigDecimal(Double.toString(value));
                    // 去掉后面无用的零  如小数点后面全是零则去掉小数点
                   cellValue =  bd1.toPlainString().replaceAll("0+?$", "").replaceAll("[.]$", "");
                    break;
                }
                case Cell.CELL_TYPE_FORMULA:{
                    //判断cell是否为日期格式
                    if(DateUtil.isCellDateFormatted(cell)){
                        //转换为日期格式YYYY-mm-dd
                        cellValue = cell.getDateCellValue();
                    }else{
                        //数字
                        cellValue = String.valueOf(cell.getNumericCellValue());
                    }
                    break;
                }
                case Cell.CELL_TYPE_STRING:{
                    cellValue = cell.getRichStringCellValue().getString();
                    break;
                }
                default:
                    cellValue = "";
            }
        }else{
            cellValue = "";
        }
        return cellValue;
    }
    /**
     * 获取解析后的list
     * @param filePath 路径
     * @param columns 表头
     * @return
     */
    public static List<Map<String,String>> getExcel(String filePath, String []columns) {
        Workbook wb =null;
        Sheet sheet = null;
        Row row = null;
        List<Map<String,String>> list = null;
        String cellData = null;
      //  String columns[] = {"姓名","电话号码"};
        wb = readExcel(filePath);
        if(wb != null){
            //用来存放表中数据
            list = new ArrayList<Map<String,String>>();
            //获取第一个sheet
            sheet = wb.getSheetAt(0);
            //获取最大行数
            int rowNum = sheet.getPhysicalNumberOfRows();
            //获取第一行
            row = sheet.getRow(0);
            //获取最大列数
            int column = row.getPhysicalNumberOfCells();
            for (int i = 1; i< rowNum; i++) {
                Map<String,String> map = new LinkedHashMap<>();
                row = sheet.getRow(i);
                if(row !=null){
                    for (int j=0;j<column;j++){
                        cellData = (String) getCellFormatValue(row.getCell(j));
                        map.put(columns[j], cellData);
                    }
                }else{
                    break;
                }
                list.add(map);
            }
        }
       return list;
    }
}

2、适用于csv

package com.test.demo.util;


import java.io.*;
import java.util.ArrayList;
import java.util.List;

/**
 * @program: outbound_server
 * @description: 导入csv
 * @author: ZhuGaoPo
 * @version:1.0
 * @create: 2019-11-11 11:41
 */
public class CsvUtils {
    /**
     * CSV文件导出
     * @param file csv文件（路径+文件名）, csv文件不会自动创建
     * @param dataList 数据
     * @return
     */

    public static boolean exportCsv(File file, List<String> dataList) {

        boolean isSuccess = false;
        //创建文件流,赋值为null
        FileOutputStream outputStream = null;
        OutputStreamWriter outputStreamWriter = null;
        BufferedWriter bufferedWriter = null;
        //操作
        try {
            outputStream = new FileOutputStream(file);
            outputStreamWriter = new OutputStreamWriter(outputStream);
            bufferedWriter = new BufferedWriter(bufferedWriter);
            if (dataList != null && !dataList.isEmpty()) {
                for (String date : dataList) {
                    //添加数据
                    bufferedWriter.append(date).append("\r");
                }
            }
            isSuccess = true;
        } catch (Exception e) {

            isSuccess = false;

        } finally {
            if (bufferedWriter != null) {
                try {
                    bufferedWriter.close();
                    bufferedWriter = null;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (outputStreamWriter != null) {
                try {
                    outputStreamWriter.close();
                    outputStreamWriter = null;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (outputStream != null) {

                try {

                    outputStream.close();

                    outputStream = null;

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }

        return isSuccess;

    }


    /**
     * CSV文件导入
     * @param file csv文件（路径+文件）
     * @return
     */
    public static List<String> importCsv(File file) {
        //数据
        List<String> dataList = new ArrayList<String>();
        BufferedReader bufferedReader = null;
        try {
            //为文件流赋数据
//            bufferedReader = new BufferedReader(new FileReader(file));
            //  DataInputStream in = new DataInputStream(new FileInputStream(file));
            bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(file), "GBK"));
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                dataList.add(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return dataList;
    }

    /**
     * * CSV文件导出测试
     */
    public static void exportCsvTest(List<String> dataList) {
        boolean isSuccess = CsvUtils.exportCsv(new File("F:/CSVTest.csv"), dataList);
        System.out.println(isSuccess);
    }


    public static void main(String[] args) {
        String fileName = "E:\\file\\csv\\test0\\test0.csv";
        List<String> list = CsvUtils.importCsv(new File(fileName));
     //   List<TelNumber> dataList = new ArrayList<>(16);
        if (list != null && !list.isEmpty()) {
            for(int i=1; i< list.size();i++){
                System.out.println(list.get(i).split(",").length);
       /*         TelNumber telNumber = new TelNumber();
                telNumber.setNumber(list.get(i).split(",")[0]);
                dataList.add(telNumber);*/
            }
/*            System.out.println(dataList);*/
        }
    }
}