POI -纯java代码实现导出excel表格

Apache

HSSF －提供读写Microsoft Excel格式档案的功能。

XSSF －提供读写Microsoft Excel OOXML格式档案的功能。

HWPF －提供读写Microsoft Word格式档案的功能。

HSLF －提供读写Microsoft PowerPoint格式档案的功能。

HDGF －提供读写Microsoft Visio格式档案的功能。

在网上看了资料。自己总结了一下。并非本人完全原创代码。

1.Student实体对象。

package com.pojo;

import java.util.Date;
/**
 * 需要的实体对象
 * @author XX帅
 * @修改日期 2014-8-19下午2:25:42
 */
public class Student {
    private int id;
    private int age;
    private String name;
    private Date days;
    
    public Student() {
        // TODO Auto-generated constructor stub
    }
    public Student(int id, int age, String name, Date days) {
        super();
        this.id = id;
        this.age = age;
        this.name = name;
        this.days = days;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Date getDays() {
        return days;
    }
    public void setDays(Date days) {
        this.days = days;
    } 
}

2.具体代码实现

package com.outdisk;

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.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;

import com.pojo.Student;
/**
 * POI-Excel手动输入数据导出
 * @author XX帅
 * @修改日期 2014-8-19下午2:20:05
 */
public class CreateSimpleExcelToDisk {
    /**
     * 手动创建的数据
     * @return
     * @throws Exception
     */
    public static List<Student> getStudents () throws Exception{
        List<Student> list = new ArrayList<Student>();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        //Student student = new Student(id, age, name, days);
        Student student1 = new Student(1, 18, "tom", format.parse("2014-08-19"));
        Student student2 = new Student(2, 19, "tom", format.parse("2014-08-20"));
        Student student3 = new Student(3, 20, "tom", format.parse("2014-08-21"));
        list.add(student1);
        list.add(student2);
        list.add(student3);
        return list;
    }
    public static void main(String[] args) throws Exception {
        // 第一步，创建一个workbook，对应一个Excel文件
        HSSFWorkbook workbook = new HSSFWorkbook();
        // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet hssfSheet = workbook.createSheet("sheet1");
        // 第三步，在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 hssfRow = hssfSheet.createRow(0);
        // 第四步，创建单元格，并设置值表头 设置表头居中
        HSSFCellStyle hssfCellStyle = workbook.createCellStyle();
        //居中样式
        hssfCellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        HSSFFont font = workbook.createFont();
        font.setColor(HSSFColor.VIOLET.index);
        font.setFontHeightInPoints((short) 16);
        hssfCellStyle.setFont(font);
        
        HSSFCell hssfCell = hssfRow.createCell(0);//列索引从0开始
        hssfCell.setCellValue("学号");//列名1
        hssfCell.setCellStyle(hssfCellStyle);//列居中显示
        hssfCell = hssfRow.createCell(1);
        hssfCell.setCellValue("年龄");//列名2
        hssfCell.setCellStyle(hssfCellStyle);
        hssfCell = hssfRow.createCell(2);
        hssfCell.setCellValue("姓名");//列名3
        hssfCell.setCellStyle(hssfCellStyle);
        hssfCell = hssfRow.createCell(3);
        hssfCell.setCellValue("生日");//列名4
        hssfCell.setCellStyle(hssfCellStyle);
        
        // 第五步，写入实体数据 实际应用中这些数据从数据库得到，
        List<Student> list = CreateSimpleExcelToDisk.getStudents();
        for (int i = 0; i < list.size(); i++) {
            hssfRow = hssfSheet.createRow(i+1);
            Student student = list.get(i);
            // 第六步，创建单元格，并设置值
            hssfRow.createCell(0).setCellValue(student.getId());
            hssfRow.createCell(1).setCellValue(student.getAge());
            hssfRow.createCell(2).setCellValue(student.getName());
            hssfRow.createCell(3).setCellValue(new SimpleDateFormat("yyyy-MM-dd").format(student.getDays()));
        }
        // 第七步，将文件存到指定位置
        try {
            FileOutputStream fileOutputStream = new FileOutputStream("E:/student.xls");//指定路径与名字和格式
            workbook.write(fileOutputStream);//讲数据写出去
            fileOutputStream.close();//关闭输出流
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

1.ExportExcel 工具类代码

package com.xs.demo.service;

import java.io.*;
import java.lang.reflect.*;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.regex.*;

import javax.swing.JOptionPane;

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

import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.formula.functions.T;

import com.xs.demo.entity.Userinfo;

public class ExportExcel<T> {
        public void exportExcel(Collection<T> dataset, OutputStream out)  
        {  
            exportExcel("测试POI导出EXCEL文档1", null, dataset, out, "yyyy-MM-dd");  
        }  
      
        public void exportExcel(String[] headers, Collection<T> dataset,  
                OutputStream out)  
        {  
            exportExcel("测试POI导出EXCEL文档2", headers, dataset, out, "yyyy-MM-dd");  
        }  
      
        public void exportExcel(String[] headers, Collection<T> dataset,  
                OutputStream out, String pattern)  
        {  
            exportExcel("测试POI导出EXCEL文档3", headers, dataset, out, pattern);  
        }  
      
        /** 
         * 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上 
         *  
         * @param title 
         *            表格标题名 
         * @param headers 
         *            表格属性列名数组 
         * @param dataset 
         *            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的 
         *            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据) 
         * @param out 
         *            与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中 
         * @param pattern 
         *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd" 
         */  
        @SuppressWarnings("unchecked")  
        public void exportExcel(String title, String[] headers,  
                Collection<T> dataset, OutputStream out, String pattern)  
        {  
            // 声明一个工作薄  
            HSSFWorkbook workbook = new HSSFWorkbook();  
            // 生成一个表格  
            HSSFSheet sheet = workbook.createSheet(title);  
            // 设置表格默认列宽度为15个字节  
            sheet.setDefaultColumnWidth((short) 15);  
            // 生成一个样式  
            HSSFCellStyle style = workbook.createCellStyle();  
            // 设置这些样式  
            style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);  
            style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);  
            style.setBorderBottom(HSSFCellStyle.BORDER_THIN);  
            style.setBorderLeft(HSSFCellStyle.BORDER_THIN);  
            style.setBorderRight(HSSFCellStyle.BORDER_THIN);  
            style.setBorderTop(HSSFCellStyle.BORDER_THIN);  
            style.setAlignment(HSSFCellStyle.ALIGN_CENTER);  
            // 生成一个字体  
            HSSFFont font = workbook.createFont();  
            font.setColor(HSSFColor.VIOLET.index);  
            font.setFontHeightInPoints((short) 12);  
            font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);  
            // 把字体应用到当前的样式  
            style.setFont(font);  
            // 生成并设置另一个样式  
            HSSFCellStyle style2 = workbook.createCellStyle();  
            style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);  
            style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);  
            style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);  
            style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);  
            style2.setBorderRight(HSSFCellStyle.BORDER_THIN);  
            style2.setBorderTop(HSSFCellStyle.BORDER_THIN);  
            style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);  
            style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);  
            // 生成另一个字体  
            HSSFFont font2 = workbook.createFont();  
            font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);  
            // 把字体应用到当前的样式  
            style2.setFont(font2);  
      
            // 声明一个画图的顶级管理器  
            HSSFPatriarch patriarch = sheet.createDrawingPatriarch();  
            // 定义注释的大小和位置,详见文档  
            HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,  
                    0, 0, 0, (short) 4, 2, (short) 6, 5));  
            // 设置注释内容  
            comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));  
            // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.  
            comment.setAuthor("leno");  
      
            // 产生表格标题行  
            HSSFRow row = sheet.createRow(0);  
            for (short i = 0; i < headers.length; i++)  
            {  
                HSSFCell cell = row.createCell(i);  
                cell.setCellStyle(style);  
                HSSFRichTextString text = new HSSFRichTextString(headers[i]);  
                cell.setCellValue(text);  
            }  
      
            // 遍历集合数据，产生数据行  
            Iterator<T> it = dataset.iterator();  
            int index = 0;  
            while (it.hasNext())  
            {  
                index++;  
                row = sheet.createRow(index);  
                T t = (T) it.next();  
                // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值  
                Field[] fields = t.getClass().getDeclaredFields();  
                for (short i = 0; i < fields.length; i++)  
                {  
                    HSSFCell cell = row.createCell(i);  
                    cell.setCellStyle(style2);  
                    Field field = fields[i];  
                    String fieldName = field.getName();  
                    String getMethodName = "get"  
                            + fieldName.substring(0, 1).toUpperCase()  
                            + fieldName.substring(1);  
                    try  
                    {  
                        Class tCls = t.getClass();  
                        Method getMethod = tCls.getMethod(getMethodName,  
                                new Class[]  
                                {});  
                        Object value = getMethod.invoke(t, new Object[]  
                        {});  
                        // 判断值的类型后进行强制类型转换  
                        String textValue = null;  
                        if (value instanceof Boolean)  
                        {  
                            boolean bValue = (Boolean) value;  
                            textValue = "男";  
                            if (!bValue)  
                            {  
                                textValue = "女";  
                            }  
                        }  
                        else if (value instanceof Date)  
                        {  
                            Date date = (Date) value;  
                            SimpleDateFormat sdf = new SimpleDateFormat(pattern);  
                            textValue = sdf.format(date);  
                        }  
                        else if (value instanceof byte[])  
                        {  
                            // 有图片时，设置行高为60px;  
                            row.setHeightInPoints(60);  
                            // 设置图片所在列宽度为80px,注意这里单位的一个换算  
                            sheet.setColumnWidth(i, (short) (35.7 * 80));  
                            // sheet.autoSizeColumn(i);  
                            byte[] bsValue = (byte[]) value;  
                            HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,  
                                    1023, 255, (short) 6, index, (short) 6, index);  
                            anchor.setAnchorType(2);  
                            patriarch.createPicture(anchor, workbook.addPicture(  
                                    bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));  
                        }  
                        else  
                        {  
                            // 其它数据类型都当作字符串简单处理  
                            textValue = value.toString();  
                        }  
                        // 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成  
                        if (textValue != null)  
                        {  
                            Pattern p = Pattern.compile("^//d+(//.//d+)?$");  
                            Matcher matcher = p.matcher(textValue);  
                            if (matcher.matches())  
                            {  
                                // 是数字当作double处理  
                                cell.setCellValue(Double.parseDouble(textValue));  
                            }  
                            else  
                            {  
                                HSSFRichTextString richString = new HSSFRichTextString(  
                                        textValue);  
                                HSSFFont font3 = workbook.createFont();  
                                font3.setColor(HSSFColor.BLUE.index);  
                                richString.applyFont(font3);  
                                cell.setCellValue(richString);  
                            }  
                        }  
                    }  
                    catch (SecurityException e)  
                    {  
                        e.printStackTrace();  
                    }  
                    catch (NoSuchMethodException e)  
                    {  
                        e.printStackTrace();  
                    }  
                    catch (IllegalArgumentException e)  
                    {  
                        e.printStackTrace();  
                    }  
                    catch (IllegalAccessException e)  
                    {  
                        e.printStackTrace();  
                    }  
                    catch (InvocationTargetException e)  
                    {  
                        e.printStackTrace();  
                    }  
                    finally  
                    {  
                        // 清理资源  
                    }  
                }  
            }  
            try  
            {  
                workbook.write(out);  
            }  
            catch (IOException e)  
            {  
                e.printStackTrace();  
            }  
        } 
        public static void main(String[] args) {
            // 测试学生  
            ExportExcel<Userinfo> ex = new ExportExcel<Userinfo>();  
            String[] headers =  
            { "学号", "姓名", "年龄", "性别", "出生日期" };  
            List<Userinfo> dataset = new ArrayList<Userinfo>();  
            dataset.add(new Userinfo(101, "11", 15, new Date(), "888888", "Asia"));
            dataset.add(new Userinfo(102, "11", 15, new Date(), "888888", "Asia"));
            dataset.add(new Userinfo(103, "11", 15, new Date(), "888888", "Asia"));
            dataset.add(new Userinfo(104, "11", 15, new Date(), "888888", "Asia"));
            dataset.add(new Userinfo(105, "11", 15, new Date(), "888888", "Asia"));
            // 测试图书  
            try  
            {  
                OutputStream out = new FileOutputStream("E://a.xls");  
                ex.exportExcel(headers, dataset, out);  
                out.close();  
                JOptionPane.showMessageDialog(null, "导出成功!");  
                System.out.println("excel导出成功！");  
            }  
            catch (FileNotFoundException e)  
            {  
                e.printStackTrace();  
            }  
            catch (IOException e)  
            {  
                e.printStackTrace();  
            }  
            }  
        
        }