java Workbook 读写excel

1. 读取具体位置的excel数据

 

package com.royan.weakey.platform.common.excel;

import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * read  a excel file of the definite path
 */
@Slf4j
public class ReadExcel {


    public static void main(String[] args) {
        ReadExcel obj = new ReadExcel<>();
        File file = new File("path");
        List> excelList = obj.readExcel(file);
        excelList.forEach(sheet -> {
            sheet.forEach(row -> {
                row.forEach(column -> {
                    System.out.print(column + " ");
                });
                System.out.println();
            });

        });

    }


    public List> readExcel(File file) {
        try {
            //create input stream ,get data
            InputStream stream = new FileInputStream(file);
            Workbook wb = new HSSFWorkbook(stream);
            int sheetSize = wb.getNumberOfSheets();
            List> sheetList = new ArrayList<>();
            for (int i = 0; i < sheetSize; i++) {
                List outerList = new ArrayList<>();
                Sheet sheet = wb.getSheetAt(i);
                for (int j = 0; j <= sheet.getLastRowNum(); j++) {
                    List list = new ArrayList<>();
                    for (int c = 0; c < sheet.getRow(j).getLastCellNum(); c++) {
                        Cell cell = sheet.getRow(j).getCell(c);
                        String str = cell.getStringCellValue();
                        list.add(str);
                    }
                    outerList.add(list);
                }
                sheetList.add(outerList);
            }
            return sheetList;

        } catch (Exception e) {
            log.info(e.getMessage());
        }
        return null;

    }


}

 

 

 

 

2.将数据写入指定的位置的excel

 

 

 

package com.royan.weakey.platform.common.excel;

import com.google.common.collect.Lists;
import com.sun.xml.internal.ws.api.streaming.XMLStreamReaderFactory;
import lombok.extern.slf4j.Slf4j;
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.*;
import java.util.*;

/**
 * writeExcel
 */
@Slf4j
public class WriteExcel {
    private static final String EXEL_XLS = "xls";
    private static final String EXEL_XLSX = "xlsx";


    public static void writeExcel(List

 

转载于:https://www.cnblogs.com/caibixiang123/p/10164423.html