package com.mi.entity;

import java.util.Date;

public class Student {

    private int id;

    private String name;

    private int age;

    private Date birth;

    public Student(int id, String name, int age, Date birth) {

        super();

        this.id = id;

        this.name = name;

        this.age = age;

        this.birth = birth;

    }

}

package com.mi.util;

import java.io.File;

import java.io.FileOutputStream;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import com.mi.entity.Student;

public class CreateSimpleExcelToDisk {

    /**

     * 手工创建一个包含student的list

     * @return

     * @throws Exception

     */

    private static List<Student> getStudent() throws Exception {

        List<Student> list = new ArrayList<>();

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");

        Student user1 = new Student(1, "张三", 16, sdf.parse("1997-03-12"));

        Student user2 = new Student(2, "李四", 17, sdf.parse("1996-08-12"));

        Student user3 = new Student(3, "王五", 26, sdf.parse("1985-11-12"));

        list.add(user1);

        list.add(user2);

        list.add(user3);

        return list;

    }

    public static void main(String[] args) throws Exception {

        //第一步,创建一个webbook文件,对应一个excel文件

        HSSFWorkbook wb = new HSSFWorkbook();

        //第二部,在excel中添加一个sheet工作簿,参数为该工作簿名字,不写为默认;

        HSSFSheet sheet = wb.createSheet("学生表1");

        //第三部,做sheet中添加表头第0行,注意老版本poi对excel的行数列数有限制short

        HSSFRow row = sheet.createRow((int)0);

        //第四部,创建单元格表头 设置表头居中

        HSSFCellStyle style = wb.createCellStyle();

        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//创建一个居中格式

        //创建具体盛放数据的单元格,可以考虑把cell抽成共通对象去使用

        HSSFCell cell = row.createCell((int) 0);

        cell.setCellValue("学号");

        cell = row.createCell((int) 1);

        cell.setCellValue("姓名");

        cell = row.createCell((int) 2);

        cell.setCellValue("年龄");

        cell = row.createCell((int) 3);

        cell.setCellValue("生日");

        //第五部,写入实体数据 实际应用中这些数据应该是从数据库中得到

        List<Student> list = CreateSimpleExcelToDisk.getStudent();

        for(int i=0;i<list.size();i++){

            //每次新建一行然后在新行中插入list中的数据对象,有点繁琐,也许有更好的封装方法,留待后看

            row = sheet.createRow((int)i+1);

            row.createCell((int)0).setCellValue(list.get(i).getId());

            row.createCell((int)1).setCellValue(list.get(i).getName());

            row.createCell((int)2).setCellValue(list.get(i).getAge());

            row.createCell((int)3).setCellValue(new SimpleDateFormat("yyyy-mm-dd").format(list.get(i).getBirth()));

        }

        //第六部,将文件保存到指定位置

        FileOutputStream fout = new FileOutputStream("D:/student.xls");

        wb.write(fout);

        fout.close();

    }

}

package com.mi.util;

import java.io.File;

import jxl.Workbook;

import jxl.format.Border;

import jxl.format.BorderLineStyle;

import jxl.format.Colour;

import jxl.write.Label;

import jxl.write.WritableCellFormat;

import jxl.write.WritableFont;

import jxl.write.WritableSheet;

import jxl.write.WritableWorkbook;

public class JxlExcelCreateTool {

    public static void main(String[] args) throws Exception {

        writeExcel();

    }

    public static void writeExcel() throws Exception {

        // 第一步创建excel文件,并决定excel的路径和文件名

        WritableWorkbook wwb = Workbook.createWorkbook(new File("D:/hello.xls"));

        // 第二部,创建工作簿,指定该工作簿的名称和位置'

        WritableSheet sheet = wwb.createSheet("test sheet1", 0);

        // 第三部,设置表格指定列的列宽

        sheet.setColumnView(0, 14);

        sheet.setColumnView(1, 12);

        sheet.setColumnView(2, 25);

        sheet.setColumnView(3, 20);

        sheet.setColumnView(4, 12);

        sheet.setColumnView(5, 9);

        // 第四部,往工作簿中插入数据,设定字体:微软雅黑,24,加粗

        // 创建字体对象

        WritableFont titleFont = new WritableFont(WritableFont.createFont("微软雅黑"), 24, WritableFont.NO_BOLD);

        WritableFont contentFont = new WritableFont(WritableFont.createFont("楷体 _GB2312"), 12, WritableFont.NO_BOLD);

        WritableCellFormat titleFormat = new WritableCellFormat(titleFont);

        WritableCellFormat contentFormat = new WritableCellFormat(contentFont);

        WritableCellFormat contentFormat2 = new WritableCellFormat(contentFont);

        contentFormat.setBorder(Border.ALL, BorderLineStyle.THIN, Colour.BLACK);

        // 设置格式居中对齐

        titleFormat.setAlignment(jxl.format.Alignment.CENTRE);

        contentFormat.setAlignment(jxl.format.Alignment.CENTRE);

        contentFormat2.setAlignment(jxl.format.Alignment.CENTRE);

        // 将定义好的单元格绑定数据添加到工作簿中

        sheet.mergeCells(0, 0, 6, 0); // 合并单元格A-G列共7列

        sheet.addCell(new Label(0, 0, "广州XXX大学2009级研究生课程考试成绩册", titleFormat));

        sheet.addCell(new Label(0, 1, "课程名称", contentFormat2));

        sheet.mergeCells(1, 1, 6, 1); // 合并单元格B-G列共7列

        sheet.addCell(new Label(1, 1, "大学数学", contentFormat2));

        sheet.addCell(new Label(0, 2, "院所教研室", contentFormat2));

        sheet.mergeCells(1, 2, 6, 2); // 合并单元格B-G列共7列

        sheet.addCell(new Label(0, 3, "填表人", contentFormat2));

        sheet.addCell(new Label(2, 3, "教研室负责人", contentFormat2));

        String th[] = { "学号", "姓名", "学院", "平时成绩", "期末成绩", "总成绩", "补考成绩" };

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

            sheet.addCell(new Label(i, 4, th[i], contentFormat2));

        }

        // 这里的数据可以从数据库里获取,个人建议将这些抽成共通的方法,提供导入数据,用时调用即可

        int xh = 200901;

        String xm = "王佳佳";

        String xy = "XXX信息技术学院";

        String space = " ";

        int cj = 50;

        String bk = "补 80";

        for (int j = 5; j < 10; j++) {

            sheet.addCell(new Label(0, j, "" + xh + j + "", contentFormat));

            sheet.addCell(new Label(1, j, xm + j, contentFormat));

            sheet.addCell(new Label(2, j, xy, contentFormat));

            sheet.addCell(new Label(3, j, space, contentFormat));

            sheet.addCell(new Label(4, j, space, contentFormat));

            sheet.addCell(new Label(5, j, "" + cj + j + "", contentFormat));

            sheet.addCell(new Label(6, j, "" + bk + "", contentFormat));

        }

        // 第五部,写入工作表完毕,关闭流

        wwb.write();

        wwb.close();

    }

}