Java导出Excel表1

一、目的

  为了便于文件打印或查看数据,需要将数据导出

  

二、代码

  

package com.sinldo.test;


import com.sinldo.po.Student;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import java.io.FileOutputStream;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

public class POI {

    public static void main(String[] args) throws ParseException {
        /**
         * 1.创建一个Excel文件
         */
        HSSFWorkbook wb=new HSSFWorkbook();
        /**
         * 2.生成Excel文件名字
         */

        HSSFSheet sheet=wb.createSheet("工作表");
        /**
         * 3.添加第0行,即添加表头
         */
        HSSFRow row=sheet.createRow(0);

        /**
         * 4.设置表头的内容
         */
        //创建一个单元格
        HSSFCell cell = row.createCell(0);
        //设置单元格的内容
        cell.setCellValue("学号");

        cell = row.createCell(1);
        cell.setCellValue("姓名");

         cell = row.createCell(2);
        cell.setCellValue("年龄");

        cell = row.createCell(3);
        cell.setCellValue("生日");
        //创建数据
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
        Student s1=new Student(1,"小雅",12,sdf.parse("1997-03-12"));
        Student s2=new Student(1,"小雅",12,sdf.parse("1997-03-12"));
        Student s3=new Student(1,"小雅",12,sdf.parse("1997-03-12"));
        Student s4=new Student(1,"小雅",12,sdf.parse("1997-03-12"));
        Student s5=new Student(1,"小雅",12,sdf.parse("1997-03-12"));
        //将数据添加到list中
        List<Student> list=new ArrayList<>();
        list.add(s1);
        list.add(s2);
        list.add(s3);
        list.add(s4);
        list.add(s5);
        /**
         * 5.将数据添加到表格中
         */
        for (int i = 0; i <5; i++) {
           row = sheet.createRow(i+1);


            Student stu = list.get(i);
            //设置单元格的数据
            row.createCell(0).setCellValue(stu.getId());
            row.createCell(1).setCellValue(stu.getName());
            row.createCell(2).setCellValue(stu.getAge());
            cell = row.createCell((short) 3);
            cell.setCellValue(new SimpleDateFormat("yyyy-MM-dd").format(stu.getBirth()));
        }
        /**
         * 6.声明下载到的地址和文件名称
         */
        try {
            //为了不覆盖,能多次下载,文件名后缀加上一个UUID。
            String uuid = UUID.randomUUID().toString().replaceAll("-","");
            //文件输出流
            FileOutputStream fos=new FileOutputStream("E:/student"+uuid+".xls");
            wb.write(fos);
            //关闭输出流
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }


}
原文地址:https://www.cnblogs.com/xuesheng/p/8177022.html