使用POI读取Execl内容

Maven 地址

      <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-ooxml</artifactId>
        <version>3.15</version>
      </dependency>
    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi-scratchpad</artifactId>
      <version>3.15</version>
    </dependency>
    <!--start-->
    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi</artifactId>
      <version>3.15</version>
    </dependency>
    <dependency>
      <groupId>fr.opensagres.xdocreport</groupId>
      <artifactId>xdocreport</artifactId>
      <version>1.0.6</version>
    </dependency>
    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi-ooxml-schemas</artifactId>
      <version>3.15</version>
    </dependency>
    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>ooxml-schemas</artifactId>
      <version>1.3</version>
    </dependency>

2.源码

package com.ys.gassys.jbean;


import com.alibaba.fastjson.JSON;
import com.ys.gassys.bean.BeanUtil;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;

import java.text.SimpleDateFormat;
import java.util.*;
import com.ys.*;

/**
 * Created with IntelliJ IDEA.
 * Description:
 *
 * @author 王飞焱
 * Date: 12:01
 * Time: 2018/8/2
 */
public class ExcelUtils {
    private final static String excel2003L =".xls";    //2003- 版本的excel
    private final static String excel2007U =".xlsx";   //2007+ 版本的excel

    /**
     * 描述：获取IO流中的数据，组装成List<List<Object>>对象
     * @param in,fileName
     * @return
     * @throws IOException
     */
    public static  List<List<Object>> getBankListByExcel(InputStream in,String fileName) throws Exception{
        List<List<Object>> list = null;
        //创建Excel工作薄
        Workbook work = getWorkbook(in,fileName);
        if(null == work){
            throw new Exception("Excel工作薄为空！");
        }
        Sheet sheet = null;  //页数
        Row row = null;  //行数
        Cell cell = null;  //列数

        list = new ArrayList<List<Object>>();
        //遍历Excel中所有的sheet
        for (int i = 0; i < work.getNumberOfSheets(); i++) {
            sheet = work.getSheetAt(i);
            if(sheet==null){continue;}
            //遍历当前sheet中的所有行
            for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {
                row = sheet.getRow(j);
                //遍历所有的列
                List<Object> li = new ArrayList<Object>();
                for (int y = 0; y < 30; y++) {
                    cell = row.getCell(y);
                    System.out.println("我是cell"+cell);
                    li.add(getValue(cell));
                }
                list.add(li);
            }
        }

        return list;

    }

    /**
     * 描述：根据文件后缀，自适应上传文件的版本
     * @param inStr,fileName
     * @return
     * @throws Exception
     */
    public static Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{
        Workbook wb = null;
        String fileType = fileName.substring(fileName.lastIndexOf("."));
        if(excel2003L.equals(fileType)){
            wb = new HSSFWorkbook(inStr);  //2003-
        }else if(excel2007U.equals(fileType)){
            wb = new XSSFWorkbook(inStr);  //2007+
        }else{
            throw new Exception("解析的文件格式有误！");
        }
        return wb;
    }

    /**
     * 描述：对表格中数值进行格式化
     * @param cell
     * @return
     */
    //解决excel类型问题，获得数值
    public static String getValue(Cell cell) {
        String value = "";
        if(null==cell){
            return value;
        }
        switch (cell.getCellType()) {
            //数值型
            case Cell.CELL_TYPE_NUMERIC:
                if (HSSFDateUtil.isCellDateFormatted(cell)) {
                    //如果是date类型则 ，获取该cell的date值
                    Date date = HSSFDateUtil.getJavaDate(cell.getNumericCellValue());
                    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
                    value = format.format(date);;
                }else {// 纯数字
                    BigDecimal big=new BigDecimal(cell.getNumericCellValue());
                    value = big.toString();
                    //解决1234.0  去掉后面的.0
                    if(null!=value&&!"".equals(value.trim())){
                        String[] item = value.split("[.]");
                        if(1<item.length&&"0".equals(item[1])){
                            value=item[0];
                        }
                    }
                }
                break;
            //字符串类型
            case Cell.CELL_TYPE_STRING:
                value = cell.getStringCellValue().toString();
                break;
            // 公式类型
            case Cell.CELL_TYPE_FORMULA:
                //读公式计算值
                value = String.valueOf(cell.getNumericCellValue());
                if (value.equals("NaN")) {// 如果获取的数据值为非法值,则转换为获取字符串
                    value = cell.getStringCellValue().toString();
                }
                break;
            // 布尔类型
            case Cell.CELL_TYPE_BOOLEAN:
                value = " "+ cell.getBooleanCellValue();
                break;
            default:
                value = cell.getStringCellValue().toString();
        }
        if("null".endsWith(value.trim())){
            value="";
        }
        return value;
    }

    public static  List<BeanUtil> getBankListByExcel1(InputStream in, String fileName) throws Exception{
        List<BeanUtil> list = null;
        //创建Excel工作薄
        Workbook work = getWorkbook(in,fileName);
        if(null == work){
            throw new Exception("Excel工作薄为空！");
        }
        Sheet sheet = null;  //页数
        Row row = null;  //行数
        Cell cell = null;  //列数

        list = new ArrayList<>();
        //遍历Excel中所有的sheet
        for (int i = 0; i < work.getNumberOfSheets(); i++) {
            sheet = work.getSheetAt(i);
            if(sheet==null){continue;}
            //遍历当前sheet中的所有行
            BeanUtil beanUtil = null;
            for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {
                row = sheet.getRow(j);
                beanUtil = new BeanUtil();
                for (int y = 0; y < 4; y++) {
                    cell = row.getCell(y);
                    if(y == 0){
                        beanUtil.setProjectName(cell.toString());
                    }
                    if (y == 1) {
                        beanUtil.setSpecimen(cell.toString());
                    }
                    if (y == 2) {
                        beanUtil.setReferenceValue(cell.toString());
                    }
                    if (y == 3) {
                        beanUtil.setClinicalSignificance(cell.toString());
                    }
                }
                list.add(beanUtil);
            }
        }
        return list;
    }

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);


        String line = scanner.nextLine();

        char firstLetter = getFirstLetter(line);

        if(firstLetter != Character.MIN_VALUE) {
            System.out.println("首字母是：" + firstLetter);
        } else {
            System.out.println("字符串中不含有字母。");
        }
    }

    static char getFirstLetter(String line) {

        for(int i = 0; i < line.length(); i++) {

            if(Character.isLetter(line.charAt(i))) {
                return Character.toUpperCase(line.charAt(i));
            }
        }

        return Character.MIN_VALUE;
    }
}