java读取和写入excel

原文链接:https://www.cnblogs.com/liyafei/p/8146136.html

1：添加处理excel的依赖jar包

        
        
            org.apache.poi
            poi
            3.16
        
        
            org.apache.poi
            poi-ooxml
            3.14
        
        
        
            net.sourceforge.jexcelapi
            jxl
            2.6.10
        

2：向excel中写入内容的类

　　WriteExcel.java

package com.li.controller;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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;

public class WriteExcel {
    private static final String EXCEL_XLS = "xls";
    private static final String EXCEL_XLSX = "xlsx";
    
    public static void main(String[] args) {
        
        Map dataMap=new HashMap();
        dataMap.put("BankName", "BankName");
        dataMap.put("Addr", "Addr");
        dataMap.put("Phone", "Phone");
        List

3:读取Excel中的数据，并写入list中

package com.li.controller;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
public class ReadExcel {
    public static void main(String[] args) {
        ReadExcel obj = new ReadExcel();
        // 此处为我创建Excel路径：E:/zhanhj/studysrc/jxl下
        File file = new File("D:/readExcel.xls");
        List excelList = obj.readExcel(file);
        System.out.println("list中的数据打印出来");
        for (int i = 0; i < excelList.size(); i++) {
            List list = (List) excelList.get(i);
            for (int j = 0; j < list.size(); j++) {
                System.out.print(list.get(j));
            }
            System.out.println();
        }

    }
    // 去读Excel的方法readExcel，该方法的入口参数为一个File对象
    public List readExcel(File file) {
        try {
            // 创建输入流，读取Excel
            InputStream is = new FileInputStream(file.getAbsolutePath());
            // jxl提供的Workbook类
            Workbook wb = Workbook.getWorkbook(is);
            // Excel的页签数量
            int sheet_size = wb.getNumberOfSheets();
            for (int index = 0; index < sheet_size; index++) {
                List outerList=new ArrayList();
                // 每个页签创建一个Sheet对象
                Sheet sheet = wb.getSheet(index);
                // sheet.getRows()返回该页的总行数
                for (int i = 0; i < sheet.getRows(); i++) {
                    List innerList=new ArrayList();
                    // sheet.getColumns()返回该页的总列数
                    for (int j = 0; j < sheet.getColumns(); j++) {
                        String cellinfo = sheet.getCell(j, i).getContents();
                        if(cellinfo.isEmpty()){
                            continue;
                        }
                        innerList.add(cellinfo);
                        System.out.print(cellinfo);
                    }
                    outerList.add(i, innerList);
                    System.out.println();
                }
                return outerList;
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (BiffException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

4：在D盘下面创建readExcel.xls（有内容） 和writeExcel.xlsx即可